1 files changed, 522 insertions, 0 deletions

diff --git a/drivers/staging/lustre/lustre/fid/fid_request.c b/drivers/staging/lustre/lustre/fid/fid_request.c
new file mode 100644
index 000000000000..fcaaca7e2e01
--- /dev/null
+++ b/drivers/staging/lustre/lustre/fid/fid_request.c
@@ -0,0 +1,522 @@
+/*
+ * 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, 2012, 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 <linux/libcfs/libcfs.h>
+# include <linux/module.h>
+
+#include <obd.h>
+#include <obd_class.h>
+#include <dt_object.h>
+#include <md_object.h>
+#include <obd_support.h>
+#include <lustre_req_layout.h>
+#include <lustre_fid.h>
+/* mdc RPC locks */
+#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;
+	ENTRY;
+
+	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, rc);
+
+	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));
+		GOTO(out_req, rc = -EINVAL);
+	}
+
+	if (range_is_exhausted(output)) {
+		CERROR("%s: Range received from server is exhausted: "
+		       DRANGE"]\n", seq->lcs_name, PRANGE(output));
+		GOTO(out_req, rc = -EINVAL);
+	}
+
+	CDEBUG_LIMIT(debug_mask, "%s: Allocated %s-sequence "DRANGE"]\n",
+		     seq->lcs_name, opcname, PRANGE(output));
+
+	EXIT;
+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;
+	ENTRY;
+
+	mutex_lock(&seq->lcs_mutex);
+
+	if (seq->lcs_srv) {
+		LASSERT(env != NULL);
+		rc = seq_server_alloc_super(seq->lcs_srv, &seq->lcs_space,
+					    env);
+	} 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;
+	ENTRY;
+
+	if (seq->lcs_srv) {
+		LASSERT(env != NULL);
+		rc = seq_server_alloc_meta(seq->lcs_srv, &seq->lcs_space, env);
+	} 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, seqno_t *seqnr)
+{
+	int rc;
+	ENTRY;
+
+	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 ["LPX64"]\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);
+
+		waitq_wait(link, TASK_UNINTERRUPTIBLE);
+
+		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, seqno_t *seqnr)
+{
+	wait_queue_t link;
+	int rc;
+
+	LASSERT(seqnr != NULL);
+	mutex_lock(&seq->lcs_mutex);
+	init_waitqueue_entry_current(&link);
+
+	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%16.16"LPF64"x]\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;
+	ENTRY;
+
+	LASSERT(seq != NULL);
+	LASSERT(fid != NULL);
+
+	init_waitqueue_entry_current(&link);
+	mutex_lock(&seq->lcs_mutex);
+
+	if (OBD_FAIL_CHECK(OBD_FAIL_SEQ_EXHAUST))
+		seq->lcs_fid.f_oid = seq->lcs_width;
+
+	while (1) {
+		seqno_t 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%16.16"LPF64"x]\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_current(&link);
+	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);
+
+		waitq_wait(&link, TASK_UNINTERRUPTIBLE);
+
+		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);
+
+#ifdef LPROCFS
+static int seq_client_proc_init(struct lu_client_seq *seq)
+{
+	int rc;
+	ENTRY;
+
+	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, rc);
+	}
+
+	RETURN(0);
+
+out_cleanup:
+	seq_client_proc_fini(seq);
+	return rc;
+}
+
+static void seq_client_proc_fini(struct lu_client_seq *seq)
+{
+	ENTRY;
+	if (seq->lcs_proc_dir) {
+		if (!IS_ERR(seq->lcs_proc_dir))
+			lprocfs_remove(&seq->lcs_proc_dir);
+		seq->lcs_proc_dir = NULL;
+	}
+	EXIT;
+}
+#else
+static int seq_client_proc_init(struct lu_client_seq *seq)
+{
+	return 0;
+}
+
+static void seq_client_proc_fini(struct lu_client_seq *seq)
+{
+	return;
+}
+#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;
+	ENTRY;
+
+	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)
+{
+	ENTRY;
+
+	seq_client_proc_fini(seq);
+
+	if (seq->lcs_exp != NULL) {
+		class_export_put(seq->lcs_exp);
+		seq->lcs_exp = NULL;
+	}
+
+	seq->lcs_srv = NULL;
+	EXIT;
+}
+EXPORT_SYMBOL(seq_client_fini);