drivers/staging/lustre/lustre/mdc/mdc_reint.c - pub/scm/linux/kernel/git/arnd/playground - Git at Google

 /*
  * 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) 2002, 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.
  */

 #define DEBUG_SUBSYSTEM S_MDC

 # include <linux/module.h>
 # include <linux/kernel.h>

 #include "../include/obd_class.h"
 #include "mdc_internal.h"
 #include "../include/lustre_fid.h"

 /* mdc_setattr does its own semaphore handling */
 static int mdc_reint(struct ptlrpc_request *request,
 		     struct mdc_rpc_lock *rpc_lock,
 		     int level)
 {
 	int rc;

 	request->rq_send_state = level;

 	mdc_get_rpc_lock(rpc_lock, NULL);
 	rc = ptlrpc_queue_wait(request);
 	mdc_put_rpc_lock(rpc_lock, NULL);
 	if (rc)
 		CDEBUG(D_INFO, "error in handling %d\n", rc);
 	else if (!req_capsule_server_get(&request->rq_pill, &RMF_MDT_BODY))
 		rc = -EPROTO;

 	return rc;
 }

 /* Find and cancel locally locks matched by inode @bits & @mode in the resource
  * found by @fid. Found locks are added into @cancel list. Returns the amount of
  * locks added to @cancels list. */
 int mdc_resource_get_unused(struct obd_export *exp, const struct lu_fid *fid,
 			    struct list_head *cancels, ldlm_mode_t mode,
 			    __u64 bits)
 {
 	struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
 	ldlm_policy_data_t policy = {};
 	struct ldlm_res_id res_id;
 	struct ldlm_resource *res;
 	int count;

 	/* Return, i.e. cancel nothing, only if ELC is supported (flag in
 	 * export) but disabled through procfs (flag in NS).
 	 *
 	 * This distinguishes from a case when ELC is not supported originally,
 	 * when we still want to cancel locks in advance and just cancel them
 	 * locally, without sending any RPC. */
 	if (exp_connect_cancelset(exp) && !ns_connect_cancelset(ns))
 		return 0;

 	fid_build_reg_res_name(fid, &res_id);
 	res = ldlm_resource_get(exp->exp_obd->obd_namespace,
 				NULL, &res_id, 0, 0);
 	if (res == NULL)
 		return 0;
 	LDLM_RESOURCE_ADDREF(res);
 	/* Initialize ibits lock policy. */
 	policy.l_inodebits.bits = bits;
 	count = ldlm_cancel_resource_local(res, cancels, &policy,
 					   mode, 0, 0, NULL);
 	LDLM_RESOURCE_DELREF(res);
 	ldlm_resource_putref(res);
 	return count;
 }

 int mdc_setattr(struct obd_export *exp, struct md_op_data *op_data,
 		void *ea, int ealen, void *ea2, int ea2len,
 		struct ptlrpc_request **request, struct md_open_data **mod)
 {
 	LIST_HEAD(cancels);
 	struct ptlrpc_request *req;
 	struct mdc_rpc_lock *rpc_lock;
 	struct obd_device *obd = exp->exp_obd;
 	int count = 0, rc;
 	__u64 bits;

 	LASSERT(op_data != NULL);

 	bits = MDS_INODELOCK_UPDATE;
 	if (op_data->op_attr.ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID))
 		bits |= MDS_INODELOCK_LOOKUP;
 	if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
 	    (fid_is_sane(&op_data->op_fid1)) &&
 	    !OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK_NET))
 		count = mdc_resource_get_unused(exp, &op_data->op_fid1,
 						&cancels, LCK_EX, bits);
 	req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 				   &RQF_MDS_REINT_SETATTR);
 	if (req == NULL) {
 		ldlm_lock_list_put(&cancels, l_bl_ast, count);
 		return -ENOMEM;
 	}
 	mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
 	if ((op_data->op_flags & (MF_SOM_CHANGE | MF_EPOCH_OPEN)) == 0)
 		req_capsule_set_size(&req->rq_pill, &RMF_MDT_EPOCH, RCL_CLIENT,
 				     0);
 	req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT, ealen);
 	req_capsule_set_size(&req->rq_pill, &RMF_LOGCOOKIES, RCL_CLIENT,
 			     ea2len);

 	rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 	if (rc) {
 		ptlrpc_request_free(req);
 		return rc;
 	}

 	rpc_lock = obd->u.cli.cl_rpc_lock;

 	if (op_data->op_attr.ia_valid & (ATTR_MTIME | ATTR_CTIME))
 		CDEBUG(D_INODE, "setting mtime %lld, ctime %lld\n",
 		       (s64)LTIME_S(op_data->op_attr.ia_mtime),
 		       (s64)LTIME_S(op_data->op_attr.ia_ctime));
 	mdc_setattr_pack(req, op_data, ea, ealen, ea2, ea2len);

 	ptlrpc_request_set_replen(req);
 	if (mod && (op_data->op_flags & MF_EPOCH_OPEN) &&
 	    req->rq_import->imp_replayable) {
 		LASSERT(*mod == NULL);

 		*mod = obd_mod_alloc();
 		if (*mod == NULL) {
 			DEBUG_REQ(D_ERROR, req, "Can't allocate md_open_data");
 		} else {
 			req->rq_replay = 1;
 			req->rq_cb_data = *mod;
 			(*mod)->mod_open_req = req;
 			req->rq_commit_cb = mdc_commit_open;
 			(*mod)->mod_is_create = true;
 			/**
 			 * Take an extra reference on \var mod, it protects \var
 			 * mod from being freed on eviction (commit callback is
 			 * called despite rq_replay flag).
 			 * Will be put on mdc_done_writing().
 			 */
 			obd_mod_get(*mod);
 		}
 	}

 	rc = mdc_reint(req, rpc_lock, LUSTRE_IMP_FULL);

 	/* Save the obtained info in the original RPC for the replay case. */
 	if (rc == 0 && (op_data->op_flags & MF_EPOCH_OPEN)) {
 		struct mdt_ioepoch *epoch;
 		struct mdt_body  *body;

 		epoch = req_capsule_client_get(&req->rq_pill, &RMF_MDT_EPOCH);
 		body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 		LASSERT(epoch != NULL);
 		LASSERT(body != NULL);
 		epoch->handle = body->handle;
 		epoch->ioepoch = body->ioepoch;
 		req->rq_replay_cb = mdc_replay_open;
 	/** bug 3633, open may be committed and estale answer is not error */
 	} else if (rc == -ESTALE && (op_data->op_flags & MF_SOM_CHANGE)) {
 		rc = 0;
 	} else if (rc == -ERESTARTSYS) {
 		rc = 0;
 	}
 	*request = req;
 	if (rc && req->rq_commit_cb) {
 		/* Put an extra reference on \var mod on error case. */
 		if (mod != NULL && *mod != NULL)
 			obd_mod_put(*mod);
 		req->rq_commit_cb(req);
 	}
 	return rc;
 }

 int mdc_create(struct obd_export *exp, struct md_op_data *op_data,
 	       const void *data, int datalen, int mode, __u32 uid, __u32 gid,
 	       cfs_cap_t cap_effective, __u64 rdev,
 	       struct ptlrpc_request **request)
 {
 	struct ptlrpc_request *req;
 	int level, rc;
 	int count, resends = 0;
 	struct obd_import *import = exp->exp_obd->u.cli.cl_import;
 	int generation = import->imp_generation;
 	LIST_HEAD(cancels);

 	/* For case if upper layer did not alloc fid, do it now. */
 	if (!fid_is_sane(&op_data->op_fid2)) {
 		/*
 		 * mdc_fid_alloc() may return errno 1 in case of switch to new
 		 * sequence, handle this.
 		 */
 		rc = mdc_fid_alloc(exp, &op_data->op_fid2, op_data);
 		if (rc < 0) {
 			CERROR("Can't alloc new fid, rc %d\n", rc);
 			return rc;
 		}
 	}

 rebuild:
 	count = 0;
 	if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
 	    (fid_is_sane(&op_data->op_fid1)))
 		count = mdc_resource_get_unused(exp, &op_data->op_fid1,
 						&cancels, LCK_EX,
 						MDS_INODELOCK_UPDATE);

 	req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 				   &RQF_MDS_REINT_CREATE_RMT_ACL);
 	if (req == NULL) {
 		ldlm_lock_list_put(&cancels, l_bl_ast, count);
 		return -ENOMEM;
 	}
 	mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
 	req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 			     op_data->op_namelen + 1);
 	req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT,
 			     data && datalen ? datalen : 0);

 	rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 	if (rc) {
 		ptlrpc_request_free(req);
 		return rc;
 	}

 	/*
 	 * mdc_create_pack() fills msg->bufs[1] with name and msg->bufs[2] with
 	 * tgt, for symlinks or lov MD data.
 	 */
 	mdc_create_pack(req, op_data, data, datalen, mode, uid,
 			gid, cap_effective, rdev);

 	ptlrpc_request_set_replen(req);

 	/* ask ptlrpc not to resend on EINPROGRESS since we have our own retry
 	 * logic here */
 	req->rq_no_retry_einprogress = 1;

 	if (resends) {
 		req->rq_generation_set = 1;
 		req->rq_import_generation = generation;
 		req->rq_sent = get_seconds() + resends;
 	}
 	level = LUSTRE_IMP_FULL;
  resend:
 	rc = mdc_reint(req, exp->exp_obd->u.cli.cl_rpc_lock, level);

 	/* Resend if we were told to. */
 	if (rc == -ERESTARTSYS) {
 		level = LUSTRE_IMP_RECOVER;
 		goto resend;
 	} else if (rc == -EINPROGRESS) {
 		/* Retry create infinitely until succeed or get other
 		 * error code. */
 		ptlrpc_req_finished(req);
 		resends++;

 		CDEBUG(D_HA, "%s: resend:%d create on "DFID"/"DFID"\n",
 		       exp->exp_obd->obd_name, resends,
 		       PFID(&op_data->op_fid1), PFID(&op_data->op_fid2));

 		if (generation == import->imp_generation) {
 			goto rebuild;
 		} else {
 			CDEBUG(D_HA, "resend cross eviction\n");
 			return -EIO;
 		}
 	} else if (rc == 0) {
 		struct mdt_body *body;
 		struct lustre_capa *capa;

 		body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 		LASSERT(body);
 		if (body->valid & OBD_MD_FLMDSCAPA) {
 			capa = req_capsule_server_get(&req->rq_pill,
 						      &RMF_CAPA1);
 			if (capa == NULL)
 				rc = -EPROTO;
 		}
 	}

 	*request = req;
 	return rc;
 }

 int mdc_unlink(struct obd_export *exp, struct md_op_data *op_data,
 	       struct ptlrpc_request **request)
 {
 	LIST_HEAD(cancels);
 	struct obd_device *obd = class_exp2obd(exp);
 	struct ptlrpc_request *req = *request;
 	int count = 0, rc;

 	LASSERT(req == NULL);

 	if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
 	    (fid_is_sane(&op_data->op_fid1)) &&
 	    !OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK_NET))
 		count = mdc_resource_get_unused(exp, &op_data->op_fid1,
 						&cancels, LCK_EX,
 						MDS_INODELOCK_UPDATE);
 	if ((op_data->op_flags & MF_MDC_CANCEL_FID3) &&
 	    (fid_is_sane(&op_data->op_fid3)) &&
 	    !OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK_NET))
 		count += mdc_resource_get_unused(exp, &op_data->op_fid3,
 						 &cancels, LCK_EX,
 						 MDS_INODELOCK_FULL);
 	req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 				   &RQF_MDS_REINT_UNLINK);
 	if (req == NULL) {
 		ldlm_lock_list_put(&cancels, l_bl_ast, count);
 		return -ENOMEM;
 	}
 	mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
 	req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 			     op_data->op_namelen + 1);

 	rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 	if (rc) {
 		ptlrpc_request_free(req);
 		return rc;
 	}

 	mdc_unlink_pack(req, op_data);

 	req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 			     obd->u.cli.cl_default_mds_easize);
 	req_capsule_set_size(&req->rq_pill, &RMF_LOGCOOKIES, RCL_SERVER,
 			     obd->u.cli.cl_default_mds_cookiesize);
 	ptlrpc_request_set_replen(req);

 	*request = req;

 	rc = mdc_reint(req, obd->u.cli.cl_rpc_lock, LUSTRE_IMP_FULL);
 	if (rc == -ERESTARTSYS)
 		rc = 0;
 	return rc;
 }

 int mdc_link(struct obd_export *exp, struct md_op_data *op_data,
 	     struct ptlrpc_request **request)
 {
 	LIST_HEAD(cancels);
 	struct obd_device *obd = exp->exp_obd;
 	struct ptlrpc_request *req;
 	int count = 0, rc;

 	if ((op_data->op_flags & MF_MDC_CANCEL_FID2) &&
 	    (fid_is_sane(&op_data->op_fid2)))
 		count = mdc_resource_get_unused(exp, &op_data->op_fid2,
 						&cancels, LCK_EX,
 						MDS_INODELOCK_UPDATE);
 	if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
 	    (fid_is_sane(&op_data->op_fid1)))
 		count += mdc_resource_get_unused(exp, &op_data->op_fid1,
 						 &cancels, LCK_EX,
 						 MDS_INODELOCK_UPDATE);

 	req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_REINT_LINK);
 	if (req == NULL) {
 		ldlm_lock_list_put(&cancels, l_bl_ast, count);
 		return -ENOMEM;
 	}
 	mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
 	mdc_set_capa_size(req, &RMF_CAPA2, op_data->op_capa2);
 	req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 			     op_data->op_namelen + 1);

 	rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 	if (rc) {
 		ptlrpc_request_free(req);
 		return rc;
 	}

 	mdc_link_pack(req, op_data);
 	ptlrpc_request_set_replen(req);

 	rc = mdc_reint(req, obd->u.cli.cl_rpc_lock, LUSTRE_IMP_FULL);
 	*request = req;
 	if (rc == -ERESTARTSYS)
 		rc = 0;

 	return rc;
 }

 int mdc_rename(struct obd_export *exp, struct md_op_data *op_data,
 	       const char *old, int oldlen, const char *new, int newlen,
 	       struct ptlrpc_request **request)
 {
 	LIST_HEAD(cancels);
 	struct obd_device *obd = exp->exp_obd;
 	struct ptlrpc_request *req;
 	int count = 0, rc;

 	if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
 	    (fid_is_sane(&op_data->op_fid1)))
 		count = mdc_resource_get_unused(exp, &op_data->op_fid1,
 						&cancels, LCK_EX,
 						MDS_INODELOCK_UPDATE);
 	if ((op_data->op_flags & MF_MDC_CANCEL_FID2) &&
 	    (fid_is_sane(&op_data->op_fid2)))
 		count += mdc_resource_get_unused(exp, &op_data->op_fid2,
 						 &cancels, LCK_EX,
 						 MDS_INODELOCK_UPDATE);
 	if ((op_data->op_flags & MF_MDC_CANCEL_FID3) &&
 	    (fid_is_sane(&op_data->op_fid3)))
 		count += mdc_resource_get_unused(exp, &op_data->op_fid3,
 						 &cancels, LCK_EX,
 						 MDS_INODELOCK_LOOKUP);
 	if ((op_data->op_flags & MF_MDC_CANCEL_FID4) &&
 	     (fid_is_sane(&op_data->op_fid4)))
 		count += mdc_resource_get_unused(exp, &op_data->op_fid4,
 						 &cancels, LCK_EX,
 						 MDS_INODELOCK_FULL);

 	req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 				   &RQF_MDS_REINT_RENAME);
 	if (req == NULL) {
 		ldlm_lock_list_put(&cancels, l_bl_ast, count);
 		return -ENOMEM;
 	}

 	mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
 	mdc_set_capa_size(req, &RMF_CAPA2, op_data->op_capa2);
 	req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT, oldlen + 1);
 	req_capsule_set_size(&req->rq_pill, &RMF_SYMTGT, RCL_CLIENT, newlen+1);

 	rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 	if (rc) {
 		ptlrpc_request_free(req);
 		return rc;
 	}

 	if (exp_connect_cancelset(exp) && req)
 		ldlm_cli_cancel_list(&cancels, count, req, 0);

 	mdc_rename_pack(req, op_data, old, oldlen, new, newlen);

 	req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 			     obd->u.cli.cl_default_mds_easize);
 	req_capsule_set_size(&req->rq_pill, &RMF_LOGCOOKIES, RCL_SERVER,
 			     obd->u.cli.cl_default_mds_cookiesize);
 	ptlrpc_request_set_replen(req);

 	rc = mdc_reint(req, obd->u.cli.cl_rpc_lock, LUSTRE_IMP_FULL);
 	*request = req;
 	if (rc == -ERESTARTSYS)
 		rc = 0;

 	return rc;
 }
	/*
	* 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) 2002, 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.
	*/

	#define DEBUG_SUBSYSTEM S_MDC

	# include <linux/module.h>
	# include <linux/kernel.h>

	#include "../include/obd_class.h"
	#include "mdc_internal.h"
	#include "../include/lustre_fid.h"

	/* mdc_setattr does its own semaphore handling */
	static int mdc_reint(struct ptlrpc_request *request,
	struct mdc_rpc_lock *rpc_lock,
	int level)
	{
	int rc;

	request->rq_send_state = level;

	mdc_get_rpc_lock(rpc_lock, NULL);
	rc = ptlrpc_queue_wait(request);
	mdc_put_rpc_lock(rpc_lock, NULL);
	if (rc)
	CDEBUG(D_INFO, "error in handling %d\n", rc);
	else if (!req_capsule_server_get(&request->rq_pill, &RMF_MDT_BODY))
	rc = -EPROTO;

	return rc;
	}

	/* Find and cancel locally locks matched by inode @bits & @mode in the resource
	* found by @fid. Found locks are added into @cancel list. Returns the amount of
	* locks added to @cancels list. */
	int mdc_resource_get_unused(struct obd_export exp, const struct lu_fid fid,
	struct list_head *cancels, ldlm_mode_t mode,
	__u64 bits)
	{
	struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
	ldlm_policy_data_t policy = {};
	struct ldlm_res_id res_id;
	struct ldlm_resource *res;
	int count;

	/* Return, i.e. cancel nothing, only if ELC is supported (flag in
	* export) but disabled through procfs (flag in NS).
	*
	* This distinguishes from a case when ELC is not supported originally,
	* when we still want to cancel locks in advance and just cancel them
	* locally, without sending any RPC. */
	if (exp_connect_cancelset(exp) && !ns_connect_cancelset(ns))
	return 0;

	fid_build_reg_res_name(fid, &res_id);
	res = ldlm_resource_get(exp->exp_obd->obd_namespace,
	NULL, &res_id, 0, 0);
	if (res == NULL)
	return 0;
	LDLM_RESOURCE_ADDREF(res);
	/* Initialize ibits lock policy. */
	policy.l_inodebits.bits = bits;
	count = ldlm_cancel_resource_local(res, cancels, &policy,
	mode, 0, 0, NULL);
	LDLM_RESOURCE_DELREF(res);
	ldlm_resource_putref(res);
	return count;
	}

	int mdc_setattr(struct obd_export exp, struct md_op_data op_data,
	void ea, int ealen, void ea2, int ea2len,
	struct ptlrpc_request request, struct md_open_data mod)
	{
	LIST_HEAD(cancels);
	struct ptlrpc_request *req;
	struct mdc_rpc_lock *rpc_lock;
	struct obd_device *obd = exp->exp_obd;
	int count = 0, rc;
	__u64 bits;

	LASSERT(op_data != NULL);

	bits = MDS_INODELOCK_UPDATE;
	if (op_data->op_attr.ia_valid & (ATTR_MODE\|ATTR_UID\|ATTR_GID))
	bits \|= MDS_INODELOCK_LOOKUP;
	if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
	(fid_is_sane(&op_data->op_fid1)) &&
	!OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK_NET))
	count = mdc_resource_get_unused(exp, &op_data->op_fid1,
	&cancels, LCK_EX, bits);
	req = ptlrpc_request_alloc(class_exp2cliimp(exp),
	&RQF_MDS_REINT_SETATTR);
	if (req == NULL) {
	ldlm_lock_list_put(&cancels, l_bl_ast, count);
	return -ENOMEM;
	}
	mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
	if ((op_data->op_flags & (MF_SOM_CHANGE \| MF_EPOCH_OPEN)) == 0)
	req_capsule_set_size(&req->rq_pill, &RMF_MDT_EPOCH, RCL_CLIENT,
	0);
	req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT, ealen);
	req_capsule_set_size(&req->rq_pill, &RMF_LOGCOOKIES, RCL_CLIENT,
	ea2len);

	rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
	if (rc) {
	ptlrpc_request_free(req);
	return rc;
	}

	rpc_lock = obd->u.cli.cl_rpc_lock;

	if (op_data->op_attr.ia_valid & (ATTR_MTIME \| ATTR_CTIME))
	CDEBUG(D_INODE, "setting mtime %lld, ctime %lld\n",
	(s64)LTIME_S(op_data->op_attr.ia_mtime),
	(s64)LTIME_S(op_data->op_attr.ia_ctime));
	mdc_setattr_pack(req, op_data, ea, ealen, ea2, ea2len);

	ptlrpc_request_set_replen(req);
	if (mod && (op_data->op_flags & MF_EPOCH_OPEN) &&
	req->rq_import->imp_replayable) {
	LASSERT(*mod == NULL);

	*mod = obd_mod_alloc();
	if (*mod == NULL) {
	DEBUG_REQ(D_ERROR, req, "Can't allocate md_open_data");
	} else {
	req->rq_replay = 1;
	req->rq_cb_data = *mod;
	(*mod)->mod_open_req = req;
	req->rq_commit_cb = mdc_commit_open;
	(*mod)->mod_is_create = true;
	/**
	* Take an extra reference on \var mod, it protects \var
	* mod from being freed on eviction (commit callback is
	* called despite rq_replay flag).
	* Will be put on mdc_done_writing().
	*/
	obd_mod_get(*mod);
	}
	}

	rc = mdc_reint(req, rpc_lock, LUSTRE_IMP_FULL);

	/* Save the obtained info in the original RPC for the replay case. */
	if (rc == 0 && (op_data->op_flags & MF_EPOCH_OPEN)) {
	struct mdt_ioepoch *epoch;
	struct mdt_body *body;

	epoch = req_capsule_client_get(&req->rq_pill, &RMF_MDT_EPOCH);
	body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
	LASSERT(epoch != NULL);
	LASSERT(body != NULL);
	epoch->handle = body->handle;
	epoch->ioepoch = body->ioepoch;
	req->rq_replay_cb = mdc_replay_open;
	/** bug 3633, open may be committed and estale answer is not error */
	} else if (rc == -ESTALE && (op_data->op_flags & MF_SOM_CHANGE)) {
	rc = 0;
	} else if (rc == -ERESTARTSYS) {
	rc = 0;
	}
	*request = req;
	if (rc && req->rq_commit_cb) {
	/* Put an extra reference on \var mod on error case. */
	if (mod != NULL && *mod != NULL)
	obd_mod_put(*mod);
	req->rq_commit_cb(req);
	}
	return rc;
	}

	int mdc_create(struct obd_export exp, struct md_op_data op_data,
	const void *data, int datalen, int mode, __u32 uid, __u32 gid,
	cfs_cap_t cap_effective, __u64 rdev,
	struct ptlrpc_request **request)
	{
	struct ptlrpc_request *req;
	int level, rc;
	int count, resends = 0;
	struct obd_import *import = exp->exp_obd->u.cli.cl_import;
	int generation = import->imp_generation;
	LIST_HEAD(cancels);

	/* For case if upper layer did not alloc fid, do it now. */
	if (!fid_is_sane(&op_data->op_fid2)) {
	/*
	* mdc_fid_alloc() may return errno 1 in case of switch to new
	* sequence, handle this.
	*/
	rc = mdc_fid_alloc(exp, &op_data->op_fid2, op_data);
	if (rc < 0) {
	CERROR("Can't alloc new fid, rc %d\n", rc);
	return rc;
	}
	}

	rebuild:
	count = 0;
	if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
	(fid_is_sane(&op_data->op_fid1)))
	count = mdc_resource_get_unused(exp, &op_data->op_fid1,
	&cancels, LCK_EX,
	MDS_INODELOCK_UPDATE);

	req = ptlrpc_request_alloc(class_exp2cliimp(exp),
	&RQF_MDS_REINT_CREATE_RMT_ACL);
	if (req == NULL) {
	ldlm_lock_list_put(&cancels, l_bl_ast, count);
	return -ENOMEM;
	}
	mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
	req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
	op_data->op_namelen + 1);
	req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT,
	data && datalen ? datalen : 0);

	rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
	if (rc) {
	ptlrpc_request_free(req);
	return rc;
	}

	/*
	* mdc_create_pack() fills msg->bufs[1] with name and msg->bufs[2] with
	* tgt, for symlinks or lov MD data.
	*/
	mdc_create_pack(req, op_data, data, datalen, mode, uid,
	gid, cap_effective, rdev);

	ptlrpc_request_set_replen(req);

	/* ask ptlrpc not to resend on EINPROGRESS since we have our own retry
	* logic here */
	req->rq_no_retry_einprogress = 1;

	if (resends) {
	req->rq_generation_set = 1;
	req->rq_import_generation = generation;
	req->rq_sent = get_seconds() + resends;
	}
	level = LUSTRE_IMP_FULL;
	resend:
	rc = mdc_reint(req, exp->exp_obd->u.cli.cl_rpc_lock, level);

	/* Resend if we were told to. */
	if (rc == -ERESTARTSYS) {
	level = LUSTRE_IMP_RECOVER;
	goto resend;
	} else if (rc == -EINPROGRESS) {
	/* Retry create infinitely until succeed or get other
	* error code. */
	ptlrpc_req_finished(req);
	resends++;

	CDEBUG(D_HA, "%s: resend:%d create on "DFID"/"DFID"\n",
	exp->exp_obd->obd_name, resends,
	PFID(&op_data->op_fid1), PFID(&op_data->op_fid2));

	if (generation == import->imp_generation) {
	goto rebuild;
	} else {
	CDEBUG(D_HA, "resend cross eviction\n");
	return -EIO;
	}
	} else if (rc == 0) {
	struct mdt_body *body;
	struct lustre_capa *capa;

	body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
	LASSERT(body);
	if (body->valid & OBD_MD_FLMDSCAPA) {
	capa = req_capsule_server_get(&req->rq_pill,
	&RMF_CAPA1);
	if (capa == NULL)
	rc = -EPROTO;
	}
	}

	*request = req;
	return rc;
	}

	int mdc_unlink(struct obd_export exp, struct md_op_data op_data,
	struct ptlrpc_request **request)
	{
	LIST_HEAD(cancels);
	struct obd_device *obd = class_exp2obd(exp);
	struct ptlrpc_request req = request;
	int count = 0, rc;

	LASSERT(req == NULL);

	if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
	(fid_is_sane(&op_data->op_fid1)) &&
	!OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK_NET))
	count = mdc_resource_get_unused(exp, &op_data->op_fid1,
	&cancels, LCK_EX,
	MDS_INODELOCK_UPDATE);
	if ((op_data->op_flags & MF_MDC_CANCEL_FID3) &&
	(fid_is_sane(&op_data->op_fid3)) &&
	!OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK_NET))
	count += mdc_resource_get_unused(exp, &op_data->op_fid3,
	&cancels, LCK_EX,
	MDS_INODELOCK_FULL);
	req = ptlrpc_request_alloc(class_exp2cliimp(exp),
	&RQF_MDS_REINT_UNLINK);
	if (req == NULL) {
	ldlm_lock_list_put(&cancels, l_bl_ast, count);
	return -ENOMEM;
	}
	mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
	req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
	op_data->op_namelen + 1);

	rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
	if (rc) {
	ptlrpc_request_free(req);
	return rc;
	}

	mdc_unlink_pack(req, op_data);

	req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
	obd->u.cli.cl_default_mds_easize);
	req_capsule_set_size(&req->rq_pill, &RMF_LOGCOOKIES, RCL_SERVER,
	obd->u.cli.cl_default_mds_cookiesize);
	ptlrpc_request_set_replen(req);

	*request = req;

	rc = mdc_reint(req, obd->u.cli.cl_rpc_lock, LUSTRE_IMP_FULL);
	if (rc == -ERESTARTSYS)
	rc = 0;
	return rc;
	}

	int mdc_link(struct obd_export exp, struct md_op_data op_data,
	struct ptlrpc_request **request)
	{
	LIST_HEAD(cancels);
	struct obd_device *obd = exp->exp_obd;
	struct ptlrpc_request *req;
	int count = 0, rc;

	if ((op_data->op_flags & MF_MDC_CANCEL_FID2) &&
	(fid_is_sane(&op_data->op_fid2)))
	count = mdc_resource_get_unused(exp, &op_data->op_fid2,
	&cancels, LCK_EX,
	MDS_INODELOCK_UPDATE);
	if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
	(fid_is_sane(&op_data->op_fid1)))
	count += mdc_resource_get_unused(exp, &op_data->op_fid1,
	&cancels, LCK_EX,
	MDS_INODELOCK_UPDATE);

	req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_REINT_LINK);
	if (req == NULL) {
	ldlm_lock_list_put(&cancels, l_bl_ast, count);
	return -ENOMEM;
	}
	mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
	mdc_set_capa_size(req, &RMF_CAPA2, op_data->op_capa2);
	req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
	op_data->op_namelen + 1);

	rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
	if (rc) {
	ptlrpc_request_free(req);
	return rc;
	}

	mdc_link_pack(req, op_data);
	ptlrpc_request_set_replen(req);

	rc = mdc_reint(req, obd->u.cli.cl_rpc_lock, LUSTRE_IMP_FULL);
	*request = req;
	if (rc == -ERESTARTSYS)
	rc = 0;

	return rc;
	}

	int mdc_rename(struct obd_export exp, struct md_op_data op_data,
	const char old, int oldlen, const char new, int newlen,
	struct ptlrpc_request **request)
	{
	LIST_HEAD(cancels);
	struct obd_device *obd = exp->exp_obd;
	struct ptlrpc_request *req;
	int count = 0, rc;

	if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
	(fid_is_sane(&op_data->op_fid1)))
	count = mdc_resource_get_unused(exp, &op_data->op_fid1,
	&cancels, LCK_EX,
	MDS_INODELOCK_UPDATE);
	if ((op_data->op_flags & MF_MDC_CANCEL_FID2) &&
	(fid_is_sane(&op_data->op_fid2)))
	count += mdc_resource_get_unused(exp, &op_data->op_fid2,
	&cancels, LCK_EX,
	MDS_INODELOCK_UPDATE);
	if ((op_data->op_flags & MF_MDC_CANCEL_FID3) &&
	(fid_is_sane(&op_data->op_fid3)))
	count += mdc_resource_get_unused(exp, &op_data->op_fid3,
	&cancels, LCK_EX,
	MDS_INODELOCK_LOOKUP);
	if ((op_data->op_flags & MF_MDC_CANCEL_FID4) &&
	(fid_is_sane(&op_data->op_fid4)))
	count += mdc_resource_get_unused(exp, &op_data->op_fid4,
	&cancels, LCK_EX,
	MDS_INODELOCK_FULL);

	req = ptlrpc_request_alloc(class_exp2cliimp(exp),
	&RQF_MDS_REINT_RENAME);
	if (req == NULL) {
	ldlm_lock_list_put(&cancels, l_bl_ast, count);
	return -ENOMEM;
	}

	mdc_set_capa_size(req, &RMF_CAPA1, op_data->op_capa1);
	mdc_set_capa_size(req, &RMF_CAPA2, op_data->op_capa2);
	req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT, oldlen + 1);
	req_capsule_set_size(&req->rq_pill, &RMF_SYMTGT, RCL_CLIENT, newlen+1);

	rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
	if (rc) {
	ptlrpc_request_free(req);
	return rc;
	}

	if (exp_connect_cancelset(exp) && req)
	ldlm_cli_cancel_list(&cancels, count, req, 0);

	mdc_rename_pack(req, op_data, old, oldlen, new, newlen);

	req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
	obd->u.cli.cl_default_mds_easize);
	req_capsule_set_size(&req->rq_pill, &RMF_LOGCOOKIES, RCL_SERVER,
	obd->u.cli.cl_default_mds_cookiesize);
	ptlrpc_request_set_replen(req);

	rc = mdc_reint(req, obd->u.cli.cl_rpc_lock, LUSTRE_IMP_FULL);
	*request = req;
	if (rc == -ERESTARTSYS)
	rc = 0;

	return rc;
	}