--- /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/fid/fid_request.c
+ *
+ * Lustre Sequence Manager
+ *
+ * Author: Yury Umanets <umka@clusterfs.com>
+ */
+
+#define DEBUG_SUBSYSTEM S_FID
+
+#include "../../include/linux/libcfs/libcfs.h"
+#include <linux/module.h>
+
+#include "../include/obd.h"
+#include "../include/obd_class.h"
+#include "../include/obd_support.h"
+#include "../include/lustre_fid.h"
+/* mdc RPC locks */
+#include "../include/lustre_mdc.h"
+#include "fid_internal.h"
+
+static int seq_client_rpc(struct lu_client_seq *seq,
+ struct lu_seq_range *output, __u32 opc,
+ const char *opcname)
+{
+ struct obd_export *exp = seq->lcs_exp;
+ struct ptlrpc_request *req;
+ struct lu_seq_range *out, *in;
+ __u32 *op;
+ unsigned int debug_mask;
+ int rc;
+
+ req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp), &RQF_SEQ_QUERY,
+ LUSTRE_MDS_VERSION, SEQ_QUERY);
+ if (req == NULL)
+ return -ENOMEM;
+
+ /* Init operation code */
+ op = req_capsule_client_get(&req->rq_pill, &RMF_SEQ_OPC);
+ *op = opc;
+
+ /* Zero out input range, this is not recovery yet. */
+ in = req_capsule_client_get(&req->rq_pill, &RMF_SEQ_RANGE);
+ range_init(in);
+
+ ptlrpc_request_set_replen(req);
+
+ in->lsr_index = seq->lcs_space.lsr_index;
+ if (seq->lcs_type == LUSTRE_SEQ_METADATA)
+ fld_range_set_mdt(in);
+ else
+ fld_range_set_ost(in);
+
+ if (opc == SEQ_ALLOC_SUPER) {
+ req->rq_request_portal = SEQ_CONTROLLER_PORTAL;
+ req->rq_reply_portal = MDC_REPLY_PORTAL;
+ /* During allocating super sequence for data object,
+ * the current thread might hold the export of MDT0(MDT0
+ * precreating objects on this OST), and it will send the
+ * request to MDT0 here, so we can not keep resending the
+ * request here, otherwise if MDT0 is failed(umounted),
+ * it can not release the export of MDT0 */
+ if (seq->lcs_type == LUSTRE_SEQ_DATA)
+ req->rq_no_delay = req->rq_no_resend = 1;
+ debug_mask = D_CONSOLE;
+ } else {
+ if (seq->lcs_type == LUSTRE_SEQ_METADATA)
+ req->rq_request_portal = SEQ_METADATA_PORTAL;
+ else
+ req->rq_request_portal = SEQ_DATA_PORTAL;
+ debug_mask = D_INFO;
+ }
+
+ ptlrpc_at_set_req_timeout(req);
+
+ if (seq->lcs_type == LUSTRE_SEQ_METADATA)
+ mdc_get_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
+ rc = ptlrpc_queue_wait(req);
+ if (seq->lcs_type == LUSTRE_SEQ_METADATA)
+ mdc_put_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
+ if (rc)
+ goto out_req;
+
+ out = req_capsule_server_get(&req->rq_pill, &RMF_SEQ_RANGE);
+ *output = *out;
+
+ if (!range_is_sane(output)) {
+ CERROR("%s: Invalid range received from server: "
+ DRANGE"\n", seq->lcs_name, PRANGE(output));
+ rc = -EINVAL;
+ goto out_req;
+ }
+
+ if (range_is_exhausted(output)) {
+ CERROR("%s: Range received from server is exhausted: "
+ DRANGE"]\n", seq->lcs_name, PRANGE(output));
+ rc = -EINVAL;
+ goto out_req;
+ }
+
+ CDEBUG_LIMIT(debug_mask, "%s: Allocated %s-sequence "DRANGE"]\n",
+ seq->lcs_name, opcname, PRANGE(output));
+
+out_req:
+ ptlrpc_req_finished(req);
+ return rc;
+}
+
+/* Request sequence-controller node to allocate new super-sequence. */
+int seq_client_alloc_super(struct lu_client_seq *seq,
+ const struct lu_env *env)
+{
+ int rc;
+
+ mutex_lock(&seq->lcs_mutex);
+
+ if (seq->lcs_srv) {
+ rc = 0;
+ } else {
+ /* Check whether the connection to seq controller has been
+ * setup (lcs_exp != NULL) */
+ if (seq->lcs_exp == NULL) {
+ mutex_unlock(&seq->lcs_mutex);
+ return -EINPROGRESS;
+ }
+
+ rc = seq_client_rpc(seq, &seq->lcs_space,
+ SEQ_ALLOC_SUPER, "super");
+ }
+ mutex_unlock(&seq->lcs_mutex);
+ return rc;
+}
+
+/* Request sequence-controller node to allocate new meta-sequence. */
+static int seq_client_alloc_meta(const struct lu_env *env,
+ struct lu_client_seq *seq)
+{
+ int rc;
+
+ if (seq->lcs_srv) {
+ rc = 0;
+ } else {
+ do {
+ /* If meta server return -EINPROGRESS or EAGAIN,
+ * it means meta server might not be ready to
+ * allocate super sequence from sequence controller
+ * (MDT0)yet */
+ rc = seq_client_rpc(seq, &seq->lcs_space,
+ SEQ_ALLOC_META, "meta");
+ } while (rc == -EINPROGRESS || rc == -EAGAIN);
+ }
+
+ return rc;
+}
+
+/* Allocate new sequence for client. */
+static int seq_client_alloc_seq(const struct lu_env *env,
+ struct lu_client_seq *seq, u64 *seqnr)
+{
+ int rc;
+
+ LASSERT(range_is_sane(&seq->lcs_space));
+
+ if (range_is_exhausted(&seq->lcs_space)) {
+ rc = seq_client_alloc_meta(env, seq);
+ if (rc) {
+ CERROR("%s: Can't allocate new meta-sequence, rc %d\n",
+ seq->lcs_name, rc);
+ return rc;
+ } else {
+ CDEBUG(D_INFO, "%s: New range - "DRANGE"\n",
+ seq->lcs_name, PRANGE(&seq->lcs_space));
+ }
+ } else {
+ rc = 0;
+ }
+
+ LASSERT(!range_is_exhausted(&seq->lcs_space));
+ *seqnr = seq->lcs_space.lsr_start;
+ seq->lcs_space.lsr_start += 1;
+
+ CDEBUG(D_INFO, "%s: Allocated sequence [%#llx]\n", seq->lcs_name,
+ *seqnr);
+
+ return rc;
+}
+
+static int seq_fid_alloc_prep(struct lu_client_seq *seq,
+ wait_queue_t *link)
+{
+ if (seq->lcs_update) {
+ add_wait_queue(&seq->lcs_waitq, link);
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ mutex_unlock(&seq->lcs_mutex);
+
+ schedule();
+
+ mutex_lock(&seq->lcs_mutex);
+ remove_wait_queue(&seq->lcs_waitq, link);
+ set_current_state(TASK_RUNNING);
+ return -EAGAIN;
+ }
+ ++seq->lcs_update;
+ mutex_unlock(&seq->lcs_mutex);
+ return 0;
+}
+
+static void seq_fid_alloc_fini(struct lu_client_seq *seq)
+{
+ LASSERT(seq->lcs_update == 1);
+ mutex_lock(&seq->lcs_mutex);
+ --seq->lcs_update;
+ wake_up(&seq->lcs_waitq);
+}
+
+/**
+ * Allocate the whole seq to the caller.
+ **/
+int seq_client_get_seq(const struct lu_env *env,
+ struct lu_client_seq *seq, u64 *seqnr)
+{
+ wait_queue_t link;
+ int rc;
+
+ LASSERT(seqnr != NULL);
+ mutex_lock(&seq->lcs_mutex);
+ init_waitqueue_entry(&link, current);
+
+ while (1) {
+ rc = seq_fid_alloc_prep(seq, &link);
+ if (rc == 0)
+ break;
+ }
+
+ rc = seq_client_alloc_seq(env, seq, seqnr);
+ if (rc) {
+ CERROR("%s: Can't allocate new sequence, rc %d\n",
+ seq->lcs_name, rc);
+ seq_fid_alloc_fini(seq);
+ mutex_unlock(&seq->lcs_mutex);
+ return rc;
+ }
+
+ CDEBUG(D_INFO, "%s: allocate sequence [0x%16.16Lx]\n",
+ seq->lcs_name, *seqnr);
+
+ /* Since the caller require the whole seq,
+ * so marked this seq to be used */
+ if (seq->lcs_type == LUSTRE_SEQ_METADATA)
+ seq->lcs_fid.f_oid = LUSTRE_METADATA_SEQ_MAX_WIDTH;
+ else
+ seq->lcs_fid.f_oid = LUSTRE_DATA_SEQ_MAX_WIDTH;
+
+ seq->lcs_fid.f_seq = *seqnr;
+ seq->lcs_fid.f_ver = 0;
+ /*
+ * Inform caller that sequence switch is performed to allow it
+ * to setup FLD for it.
+ */
+ seq_fid_alloc_fini(seq);
+ mutex_unlock(&seq->lcs_mutex);
+
+ return rc;
+}
+EXPORT_SYMBOL(seq_client_get_seq);
+
+/* Allocate new fid on passed client @seq and save it to @fid. */
+int seq_client_alloc_fid(const struct lu_env *env,
+ struct lu_client_seq *seq, struct lu_fid *fid)
+{
+ wait_queue_t link;
+ int rc;
+
+ LASSERT(seq != NULL);
+ LASSERT(fid != NULL);
+
+ init_waitqueue_entry(&link, current);
+ mutex_lock(&seq->lcs_mutex);
+
+ if (OBD_FAIL_CHECK(OBD_FAIL_SEQ_EXHAUST))
+ seq->lcs_fid.f_oid = seq->lcs_width;
+
+ while (1) {
+ u64 seqnr;
+
+ if (!fid_is_zero(&seq->lcs_fid) &&
+ fid_oid(&seq->lcs_fid) < seq->lcs_width) {
+ /* Just bump last allocated fid and return to caller. */
+ seq->lcs_fid.f_oid += 1;
+ rc = 0;
+ break;
+ }
+
+ rc = seq_fid_alloc_prep(seq, &link);
+ if (rc)
+ continue;
+
+ rc = seq_client_alloc_seq(env, seq, &seqnr);
+ if (rc) {
+ CERROR("%s: Can't allocate new sequence, rc %d\n",
+ seq->lcs_name, rc);
+ seq_fid_alloc_fini(seq);
+ mutex_unlock(&seq->lcs_mutex);
+ return rc;
+ }
+
+ CDEBUG(D_INFO, "%s: Switch to sequence [0x%16.16Lx]\n",
+ seq->lcs_name, seqnr);
+
+ seq->lcs_fid.f_oid = LUSTRE_FID_INIT_OID;
+ seq->lcs_fid.f_seq = seqnr;
+ seq->lcs_fid.f_ver = 0;
+
+ /*
+ * Inform caller that sequence switch is performed to allow it
+ * to setup FLD for it.
+ */
+ rc = 1;
+
+ seq_fid_alloc_fini(seq);
+ break;
+ }
+
+ *fid = seq->lcs_fid;
+ mutex_unlock(&seq->lcs_mutex);
+
+ CDEBUG(D_INFO, "%s: Allocated FID "DFID"\n", seq->lcs_name, PFID(fid));
+ return rc;
+}
+EXPORT_SYMBOL(seq_client_alloc_fid);
+
+/*
+ * Finish the current sequence due to disconnect.
+ * See mdc_import_event()
+ */
+void seq_client_flush(struct lu_client_seq *seq)
+{
+ wait_queue_t link;
+
+ LASSERT(seq != NULL);
+ init_waitqueue_entry(&link, current);
+ mutex_lock(&seq->lcs_mutex);
+
+ while (seq->lcs_update) {
+ add_wait_queue(&seq->lcs_waitq, &link);
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ mutex_unlock(&seq->lcs_mutex);
+
+ schedule();
+
+ mutex_lock(&seq->lcs_mutex);
+ remove_wait_queue(&seq->lcs_waitq, &link);
+ set_current_state(TASK_RUNNING);
+ }
+
+ fid_zero(&seq->lcs_fid);
+ /**
+ * this id shld not be used for seq range allocation.
+ * set to -1 for dgb check.
+ */
+
+ seq->lcs_space.lsr_index = -1;
+
+ range_init(&seq->lcs_space);
+ mutex_unlock(&seq->lcs_mutex);
+}
+EXPORT_SYMBOL(seq_client_flush);
+
+static void seq_client_proc_fini(struct lu_client_seq *seq)
+{
+#if defined(CONFIG_PROC_FS)
+ if (seq->lcs_proc_dir) {
+ if (!IS_ERR(seq->lcs_proc_dir))
+ lprocfs_remove(&seq->lcs_proc_dir);
+ seq->lcs_proc_dir = NULL;
+ }
+#endif /* CONFIG_PROC_FS */
+}
+
+static int seq_client_proc_init(struct lu_client_seq *seq)
+{
+#if defined(CONFIG_PROC_FS)
+ int rc;
+
+ seq->lcs_proc_dir = lprocfs_register(seq->lcs_name,
+ seq_type_proc_dir,
+ NULL, NULL);
+
+ if (IS_ERR(seq->lcs_proc_dir)) {
+ CERROR("%s: LProcFS failed in seq-init\n",
+ seq->lcs_name);
+ rc = PTR_ERR(seq->lcs_proc_dir);
+ return rc;
+ }
+
+ rc = lprocfs_add_vars(seq->lcs_proc_dir,
+ seq_client_proc_list, seq);
+ if (rc) {
+ CERROR("%s: Can't init sequence manager proc, rc %d\n",
+ seq->lcs_name, rc);
+ goto out_cleanup;
+ }
+
+ return 0;
+
+out_cleanup:
+ seq_client_proc_fini(seq);
+ return rc;
+
+#else /* CONFIG_PROC_FS */
+ return 0;
+#endif
+}
+
+int seq_client_init(struct lu_client_seq *seq,
+ struct obd_export *exp,
+ enum lu_cli_type type,
+ const char *prefix,
+ struct lu_server_seq *srv)
+{
+ int rc;
+
+ LASSERT(seq != NULL);
+ LASSERT(prefix != NULL);
+
+ seq->lcs_srv = srv;
+ seq->lcs_type = type;
+
+ mutex_init(&seq->lcs_mutex);
+ if (type == LUSTRE_SEQ_METADATA)
+ seq->lcs_width = LUSTRE_METADATA_SEQ_MAX_WIDTH;
+ else
+ seq->lcs_width = LUSTRE_DATA_SEQ_MAX_WIDTH;
+
+ init_waitqueue_head(&seq->lcs_waitq);
+ /* Make sure that things are clear before work is started. */
+ seq_client_flush(seq);
+
+ if (exp != NULL)
+ seq->lcs_exp = class_export_get(exp);
+ else if (type == LUSTRE_SEQ_METADATA)
+ LASSERT(seq->lcs_srv != NULL);
+
+ snprintf(seq->lcs_name, sizeof(seq->lcs_name),
+ "cli-%s", prefix);
+
+ rc = seq_client_proc_init(seq);
+ if (rc)
+ seq_client_fini(seq);
+ return rc;
+}
+EXPORT_SYMBOL(seq_client_init);
+
+void seq_client_fini(struct lu_client_seq *seq)
+{
+ seq_client_proc_fini(seq);
+
+ if (seq->lcs_exp != NULL) {
+ class_export_put(seq->lcs_exp);
+ seq->lcs_exp = NULL;
+ }
+
+ seq->lcs_srv = NULL;
+}
+EXPORT_SYMBOL(seq_client_fini);
+
+int client_fid_init(struct obd_device *obd,
+ struct obd_export *exp, enum lu_cli_type type)
+{
+ struct client_obd *cli = &obd->u.cli;
+ char *prefix;
+ int rc;
+
+ OBD_ALLOC_PTR(cli->cl_seq);
+ if (cli->cl_seq == NULL)
+ return -ENOMEM;
+
+ OBD_ALLOC(prefix, MAX_OBD_NAME + 5);
+ if (prefix == NULL) {
+ rc = -ENOMEM;
+ goto out_free_seq;
+ }
+
+ snprintf(prefix, MAX_OBD_NAME + 5, "cli-%s", obd->obd_name);
+
+ /* Init client side sequence-manager */
+ rc = seq_client_init(cli->cl_seq, exp, type, prefix, NULL);
+ OBD_FREE(prefix, MAX_OBD_NAME + 5);
+ if (rc)
+ goto out_free_seq;
+
+ return rc;
+out_free_seq:
+ OBD_FREE_PTR(cli->cl_seq);
+ cli->cl_seq = NULL;
+ return rc;
+}
+EXPORT_SYMBOL(client_fid_init);
+
+int client_fid_fini(struct obd_device *obd)
+{
+ struct client_obd *cli = &obd->u.cli;
+
+ if (cli->cl_seq != NULL) {
+ seq_client_fini(cli->cl_seq);
+ OBD_FREE_PTR(cli->cl_seq);
+ cli->cl_seq = NULL;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(client_fid_fini);
+
+struct proc_dir_entry *seq_type_proc_dir;
+
+static int __init fid_mod_init(void)
+{
+ seq_type_proc_dir = lprocfs_register(LUSTRE_SEQ_NAME,
+ proc_lustre_root,
+ NULL, NULL);
+ return PTR_ERR_OR_ZERO(seq_type_proc_dir);
+}
+
+static void __exit fid_mod_exit(void)
+{
+ if (seq_type_proc_dir != NULL && !IS_ERR(seq_type_proc_dir)) {
+ lprocfs_remove(&seq_type_proc_dir);
+ seq_type_proc_dir = NULL;
+ }
+}
+
+MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
+MODULE_DESCRIPTION("Lustre FID Module");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("0.1.0");
+
+module_init(fid_mod_init);
+module_exit(fid_mod_exit);
Code Review / kvmfornfv.git / blobdiff