--- /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
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * 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) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2013, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lustre/fld/fld_request.c
+ *
+ * FLD (Fids Location Database)
+ *
+ * Author: Yury Umanets <umka@clusterfs.com>
+ */
+
+#define DEBUG_SUBSYSTEM S_FLD
+
+#include "../../include/linux/libcfs/libcfs.h"
+#include <linux/module.h>
+#include <asm/div64.h>
+
+#include "../include/obd.h"
+#include "../include/obd_class.h"
+#include "../include/lustre_ver.h"
+#include "../include/obd_support.h"
+#include "../include/lprocfs_status.h"
+
+#include "../include/dt_object.h"
+#include "../include/lustre_req_layout.h"
+#include "../include/lustre_fld.h"
+#include "../include/lustre_mdc.h"
+#include "fld_internal.h"
+
+/* TODO: these 3 functions are copies of flow-control code from mdc_lib.c
+ * It should be common thing. The same about mdc RPC lock */
+static int fld_req_avail(struct client_obd *cli, struct mdc_cache_waiter *mcw)
+{
+ int rc;
+
+ client_obd_list_lock(&cli->cl_loi_list_lock);
+ rc = list_empty(&mcw->mcw_entry);
+ client_obd_list_unlock(&cli->cl_loi_list_lock);
+ return rc;
+};
+
+static void fld_enter_request(struct client_obd *cli)
+{
+ struct mdc_cache_waiter mcw;
+ struct l_wait_info lwi = { 0 };
+
+ client_obd_list_lock(&cli->cl_loi_list_lock);
+ if (cli->cl_r_in_flight >= cli->cl_max_rpcs_in_flight) {
+ list_add_tail(&mcw.mcw_entry, &cli->cl_cache_waiters);
+ init_waitqueue_head(&mcw.mcw_waitq);
+ client_obd_list_unlock(&cli->cl_loi_list_lock);
+ l_wait_event(mcw.mcw_waitq, fld_req_avail(cli, &mcw), &lwi);
+ } else {
+ cli->cl_r_in_flight++;
+ client_obd_list_unlock(&cli->cl_loi_list_lock);
+ }
+}
+
+static void fld_exit_request(struct client_obd *cli)
+{
+ struct list_head *l, *tmp;
+ struct mdc_cache_waiter *mcw;
+
+ client_obd_list_lock(&cli->cl_loi_list_lock);
+ cli->cl_r_in_flight--;
+ list_for_each_safe(l, tmp, &cli->cl_cache_waiters) {
+
+ if (cli->cl_r_in_flight >= cli->cl_max_rpcs_in_flight) {
+ /* No free request slots anymore */
+ break;
+ }
+
+ mcw = list_entry(l, struct mdc_cache_waiter, mcw_entry);
+ list_del_init(&mcw->mcw_entry);
+ cli->cl_r_in_flight++;
+ wake_up(&mcw->mcw_waitq);
+ }
+ client_obd_list_unlock(&cli->cl_loi_list_lock);
+}
+
+static int fld_rrb_hash(struct lu_client_fld *fld, u64 seq)
+{
+ LASSERT(fld->lcf_count > 0);
+ return do_div(seq, fld->lcf_count);
+}
+
+static struct lu_fld_target *
+fld_rrb_scan(struct lu_client_fld *fld, u64 seq)
+{
+ struct lu_fld_target *target;
+ int hash;
+
+ /* Because almost all of special sequence located in MDT0,
+ * it should go to index 0 directly, instead of calculating
+ * hash again, and also if other MDTs is not being connected,
+ * the fld lookup requests(for seq on MDT0) should not be
+ * blocked because of other MDTs */
+ if (fid_seq_is_norm(seq))
+ hash = fld_rrb_hash(fld, seq);
+ else
+ hash = 0;
+
+again:
+ list_for_each_entry(target, &fld->lcf_targets, ft_chain) {
+ if (target->ft_idx == hash)
+ return target;
+ }
+
+ if (hash != 0) {
+ /* It is possible the remote target(MDT) are not connected to
+ * with client yet, so we will refer this to MDT0, which should
+ * be connected during mount */
+ hash = 0;
+ goto again;
+ }
+
+ CERROR("%s: Can't find target by hash %d (seq %#llx). Targets (%d):\n",
+ fld->lcf_name, hash, seq, fld->lcf_count);
+
+ list_for_each_entry(target, &fld->lcf_targets, ft_chain) {
+ const char *srv_name = target->ft_srv != NULL ?
+ target->ft_srv->lsf_name : "<null>";
+ const char *exp_name = target->ft_exp != NULL ?
+ (char *)target->ft_exp->exp_obd->obd_uuid.uuid :
+ "<null>";
+
+ CERROR(" exp: 0x%p (%s), srv: 0x%p (%s), idx: %llu\n",
+ target->ft_exp, exp_name, target->ft_srv,
+ srv_name, target->ft_idx);
+ }
+
+ /*
+ * If target is not found, there is logical error anyway, so here is
+ * LBUG() to catch this situation.
+ */
+ LBUG();
+ return NULL;
+}
+
+struct lu_fld_hash fld_hash[] = {
+ {
+ .fh_name = "RRB",
+ .fh_hash_func = fld_rrb_hash,
+ .fh_scan_func = fld_rrb_scan
+ },
+ {
+ NULL,
+ }
+};
+
+static struct lu_fld_target *
+fld_client_get_target(struct lu_client_fld *fld, u64 seq)
+{
+ struct lu_fld_target *target;
+
+ LASSERT(fld->lcf_hash != NULL);
+
+ spin_lock(&fld->lcf_lock);
+ target = fld->lcf_hash->fh_scan_func(fld, seq);
+ spin_unlock(&fld->lcf_lock);
+
+ if (target != NULL) {
+ CDEBUG(D_INFO, "%s: Found target (idx %llu) by seq %#llx\n",
+ fld->lcf_name, target->ft_idx, seq);
+ }
+
+ return target;
+}
+
+/*
+ * Add export to FLD. This is usually done by CMM and LMV as they are main users
+ * of FLD module.
+ */
+int fld_client_add_target(struct lu_client_fld *fld,
+ struct lu_fld_target *tar)
+{
+ const char *name;
+ struct lu_fld_target *target, *tmp;
+
+ LASSERT(tar != NULL);
+ name = fld_target_name(tar);
+ LASSERT(name != NULL);
+ LASSERT(tar->ft_srv != NULL || tar->ft_exp != NULL);
+
+ if (fld->lcf_flags != LUSTRE_FLD_INIT) {
+ CERROR("%s: Attempt to add target %s (idx %llu) on fly - skip it\n",
+ fld->lcf_name, name, tar->ft_idx);
+ return 0;
+ }
+ CDEBUG(D_INFO, "%s: Adding target %s (idx %llu)\n",
+ fld->lcf_name, name, tar->ft_idx);
+
+ OBD_ALLOC_PTR(target);
+ if (target == NULL)
+ return -ENOMEM;
+
+ spin_lock(&fld->lcf_lock);
+ list_for_each_entry(tmp, &fld->lcf_targets, ft_chain) {
+ if (tmp->ft_idx == tar->ft_idx) {
+ spin_unlock(&fld->lcf_lock);
+ OBD_FREE_PTR(target);
+ CERROR("Target %s exists in FLD and known as %s:#%llu\n",
+ name, fld_target_name(tmp), tmp->ft_idx);
+ return -EEXIST;
+ }
+ }
+
+ target->ft_exp = tar->ft_exp;
+ if (target->ft_exp != NULL)
+ class_export_get(target->ft_exp);
+ target->ft_srv = tar->ft_srv;
+ target->ft_idx = tar->ft_idx;
+
+ list_add_tail(&target->ft_chain,
+ &fld->lcf_targets);
+
+ fld->lcf_count++;
+ spin_unlock(&fld->lcf_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL(fld_client_add_target);
+
+/* Remove export from FLD */
+int fld_client_del_target(struct lu_client_fld *fld, __u64 idx)
+{
+ struct lu_fld_target *target, *tmp;
+
+ spin_lock(&fld->lcf_lock);
+ list_for_each_entry_safe(target, tmp,
+ &fld->lcf_targets, ft_chain) {
+ if (target->ft_idx == idx) {
+ fld->lcf_count--;
+ list_del(&target->ft_chain);
+ spin_unlock(&fld->lcf_lock);
+
+ if (target->ft_exp != NULL)
+ class_export_put(target->ft_exp);
+
+ OBD_FREE_PTR(target);
+ return 0;
+ }
+ }
+ spin_unlock(&fld->lcf_lock);
+ return -ENOENT;
+}
+EXPORT_SYMBOL(fld_client_del_target);
+
+static struct proc_dir_entry *fld_type_proc_dir;
+
+#if defined(CONFIG_PROC_FS)
+static int fld_client_proc_init(struct lu_client_fld *fld)
+{
+ int rc;
+
+ fld->lcf_proc_dir = lprocfs_register(fld->lcf_name,
+ fld_type_proc_dir,
+ NULL, NULL);
+
+ if (IS_ERR(fld->lcf_proc_dir)) {
+ CERROR("%s: LProcFS failed in fld-init\n",
+ fld->lcf_name);
+ rc = PTR_ERR(fld->lcf_proc_dir);
+ return rc;
+ }
+
+ rc = lprocfs_add_vars(fld->lcf_proc_dir,
+ fld_client_proc_list, fld);
+ if (rc) {
+ CERROR("%s: Can't init FLD proc, rc %d\n",
+ fld->lcf_name, rc);
+ goto out_cleanup;
+ }
+
+ return 0;
+
+out_cleanup:
+ fld_client_proc_fini(fld);
+ return rc;
+}
+
+void fld_client_proc_fini(struct lu_client_fld *fld)
+{
+ if (fld->lcf_proc_dir) {
+ if (!IS_ERR(fld->lcf_proc_dir))
+ lprocfs_remove(&fld->lcf_proc_dir);
+ fld->lcf_proc_dir = NULL;
+ }
+}
+#else
+static int fld_client_proc_init(struct lu_client_fld *fld)
+{
+ return 0;
+}
+
+void fld_client_proc_fini(struct lu_client_fld *fld)
+{
+}
+#endif
+EXPORT_SYMBOL(fld_client_proc_fini);
+
+static inline int hash_is_sane(int hash)
+{
+ return (hash >= 0 && hash < ARRAY_SIZE(fld_hash));
+}
+
+int fld_client_init(struct lu_client_fld *fld,
+ const char *prefix, int hash)
+{
+ int cache_size, cache_threshold;
+ int rc;
+
+ LASSERT(fld != NULL);
+
+ snprintf(fld->lcf_name, sizeof(fld->lcf_name),
+ "cli-%s", prefix);
+
+ if (!hash_is_sane(hash)) {
+ CERROR("%s: Wrong hash function %#x\n",
+ fld->lcf_name, hash);
+ return -EINVAL;
+ }
+
+ fld->lcf_count = 0;
+ spin_lock_init(&fld->lcf_lock);
+ fld->lcf_hash = &fld_hash[hash];
+ fld->lcf_flags = LUSTRE_FLD_INIT;
+ INIT_LIST_HEAD(&fld->lcf_targets);
+
+ cache_size = FLD_CLIENT_CACHE_SIZE /
+ sizeof(struct fld_cache_entry);
+
+ cache_threshold = cache_size *
+ FLD_CLIENT_CACHE_THRESHOLD / 100;
+
+ fld->lcf_cache = fld_cache_init(fld->lcf_name,
+ cache_size, cache_threshold);
+ if (IS_ERR(fld->lcf_cache)) {
+ rc = PTR_ERR(fld->lcf_cache);
+ fld->lcf_cache = NULL;
+ goto out;
+ }
+
+ rc = fld_client_proc_init(fld);
+ if (rc)
+ goto out;
+out:
+ if (rc)
+ fld_client_fini(fld);
+ else
+ CDEBUG(D_INFO, "%s: Using \"%s\" hash\n",
+ fld->lcf_name, fld->lcf_hash->fh_name);
+ return rc;
+}
+EXPORT_SYMBOL(fld_client_init);
+
+void fld_client_fini(struct lu_client_fld *fld)
+{
+ struct lu_fld_target *target, *tmp;
+
+ spin_lock(&fld->lcf_lock);
+ list_for_each_entry_safe(target, tmp,
+ &fld->lcf_targets, ft_chain) {
+ fld->lcf_count--;
+ list_del(&target->ft_chain);
+ if (target->ft_exp != NULL)
+ class_export_put(target->ft_exp);
+ OBD_FREE_PTR(target);
+ }
+ spin_unlock(&fld->lcf_lock);
+
+ if (fld->lcf_cache != NULL) {
+ if (!IS_ERR(fld->lcf_cache))
+ fld_cache_fini(fld->lcf_cache);
+ fld->lcf_cache = NULL;
+ }
+}
+EXPORT_SYMBOL(fld_client_fini);
+
+int fld_client_rpc(struct obd_export *exp,
+ struct lu_seq_range *range, __u32 fld_op)
+{
+ struct ptlrpc_request *req;
+ struct lu_seq_range *prange;
+ __u32 *op;
+ int rc;
+ struct obd_import *imp;
+
+ LASSERT(exp != NULL);
+
+ imp = class_exp2cliimp(exp);
+ req = ptlrpc_request_alloc_pack(imp, &RQF_FLD_QUERY, LUSTRE_MDS_VERSION,
+ FLD_QUERY);
+ if (req == NULL)
+ return -ENOMEM;
+
+ op = req_capsule_client_get(&req->rq_pill, &RMF_FLD_OPC);
+ *op = fld_op;
+
+ prange = req_capsule_client_get(&req->rq_pill, &RMF_FLD_MDFLD);
+ *prange = *range;
+
+ ptlrpc_request_set_replen(req);
+ req->rq_request_portal = FLD_REQUEST_PORTAL;
+ req->rq_reply_portal = MDC_REPLY_PORTAL;
+ ptlrpc_at_set_req_timeout(req);
+
+ if (fld_op == FLD_LOOKUP &&
+ imp->imp_connect_flags_orig & OBD_CONNECT_MDS_MDS)
+ req->rq_allow_replay = 1;
+
+ if (fld_op != FLD_LOOKUP)
+ mdc_get_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
+ fld_enter_request(&exp->exp_obd->u.cli);
+ rc = ptlrpc_queue_wait(req);
+ fld_exit_request(&exp->exp_obd->u.cli);
+ if (fld_op != FLD_LOOKUP)
+ mdc_put_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
+ if (rc)
+ goto out_req;
+
+ prange = req_capsule_server_get(&req->rq_pill, &RMF_FLD_MDFLD);
+ if (prange == NULL) {
+ rc = -EFAULT;
+ goto out_req;
+ }
+ *range = *prange;
+out_req:
+ ptlrpc_req_finished(req);
+ return rc;
+}
+
+int fld_client_lookup(struct lu_client_fld *fld, u64 seq, u32 *mds,
+ __u32 flags, const struct lu_env *env)
+{
+ struct lu_seq_range res = { 0 };
+ struct lu_fld_target *target;
+ int rc;
+
+ fld->lcf_flags |= LUSTRE_FLD_RUN;
+
+ rc = fld_cache_lookup(fld->lcf_cache, seq, &res);
+ if (rc == 0) {
+ *mds = res.lsr_index;
+ return 0;
+ }
+
+ /* Can not find it in the cache */
+ target = fld_client_get_target(fld, seq);
+ LASSERT(target != NULL);
+
+ CDEBUG(D_INFO, "%s: Lookup fld entry (seq: %#llx) on target %s (idx %llu)\n",
+ fld->lcf_name, seq, fld_target_name(target), target->ft_idx);
+
+ res.lsr_start = seq;
+ fld_range_set_type(&res, flags);
+ rc = fld_client_rpc(target->ft_exp, &res, FLD_LOOKUP);
+
+ if (rc == 0) {
+ *mds = res.lsr_index;
+
+ fld_cache_insert(fld->lcf_cache, &res);
+ }
+ return rc;
+}
+EXPORT_SYMBOL(fld_client_lookup);
+
+void fld_client_flush(struct lu_client_fld *fld)
+{
+ fld_cache_flush(fld->lcf_cache);
+}
+EXPORT_SYMBOL(fld_client_flush);
+
+static int __init fld_mod_init(void)
+{
+ fld_type_proc_dir = lprocfs_register(LUSTRE_FLD_NAME,
+ proc_lustre_root,
+ NULL, NULL);
+ return PTR_ERR_OR_ZERO(fld_type_proc_dir);
+}
+
+static void __exit fld_mod_exit(void)
+{
+ if (fld_type_proc_dir != NULL && !IS_ERR(fld_type_proc_dir)) {
+ lprocfs_remove(&fld_type_proc_dir);
+ fld_type_proc_dir = NULL;
+ }
+}
+
+MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
+MODULE_DESCRIPTION("Lustre FLD");
+MODULE_LICENSE("GPL");
+
+module_init(fld_mod_init)
+module_exit(fld_mod_exit)
Code Review / kvmfornfv.git / blobdiff