[PATCH] staging: lustre: obdech: remove unused file

[Julia Lawall]

From: Julia Lawall <Julia.Lawall@xxxxxxx>

This file contains unresolved references and is not mentioned in the
Makefile.

Signed-off-by: Julia Lawall <Julia.Lawall@xxxxxxx>

---
This should be applied after the return-parenthesis patch.

diff --git a/drivers/staging/lustre/lustre/obdecho/echo.c b/drivers/staging/lustre/lustre/obdecho/echo.c
deleted file mode 100644
index 3d0686d..0000000
--- a/drivers/staging/lustre/lustre/obdecho/echo.c
+++ /dev/null
@@ -1,672 +0,0 @@
-/*
- * 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) 2010, 2012, Intel Corporation.
- */
-/*
- * This file is part of Lustre, http://www.lustre.org/
- * Lustre is a trademark of Sun Microsystems, Inc.
- *
- * lustre/obdecho/echo.c
- *
- * Author: Peter Braam <braam@xxxxxxxxxxxxx>
- * Author: Andreas Dilger <adilger@xxxxxxxxxxxxx>
- */
-
-#define DEBUG_SUBSYSTEM S_ECHO
-
-#include "../include/obd_support.h"
-#include "../include/obd_class.h"
-#include "../include/lustre_debug.h"
-#include "../include/lustre_dlm.h"
-#include "../include/lprocfs_status.h"
-
-#include "echo_internal.h"
-
-/* The echo objid needs to be below 2^32, because regular FID numbers are
- * limited to 2^32 objects in f_oid for the FID_SEQ_ECHO range. b=23335 */
-#define ECHO_INIT_OID	0x10000000ULL
-#define ECHO_HANDLE_MAGIC    0xabcd0123fedc9876ULL
-
-#define ECHO_PERSISTENT_PAGES (ECHO_PERSISTENT_SIZE >> PAGE_CACHE_SHIFT)
-static struct page *echo_persistent_pages[ECHO_PERSISTENT_PAGES];
-
-enum {
-	LPROC_ECHO_READ_BYTES = 1,
-	LPROC_ECHO_WRITE_BYTES = 2,
-	LPROC_ECHO_LAST = LPROC_ECHO_WRITE_BYTES +1
-};
-
-static int echo_connect(const struct lu_env *env,
-			struct obd_export **exp, struct obd_device *obd,
-			struct obd_uuid *cluuid, struct obd_connect_data *data,
-			void *localdata)
-{
-	struct lustre_handle conn = { 0 };
-	int rc;
-
-	data->ocd_connect_flags &= ECHO_CONNECT_SUPPORTED;
-	rc = class_connect(&conn, obd, cluuid);
-	if (rc) {
-		CERROR("can't connect %d\n", rc);
-		return rc;
-	}
-	*exp = class_conn2export(&conn);
-
-	return 0;
-}
-
-static int echo_disconnect(struct obd_export *exp)
-{
-	LASSERT (exp != NULL);
-
-	return server_disconnect_export(exp);
-}
-
-static int echo_init_export(struct obd_export *exp)
-{
-	return ldlm_init_export(exp);
-}
-
-static int echo_destroy_export(struct obd_export *exp)
-{
-	target_destroy_export(exp);
-	ldlm_destroy_export(exp);
-
-	return 0;
-}
-
- static __u64 echo_next_id(struct obd_device *obddev)
-{
-	u64 id;
-
-	spin_lock(&obddev->u.echo.eo_lock);
-	id = ++obddev->u.echo.eo_lastino;
-	spin_unlock(&obddev->u.echo.eo_lock);
-
-	return id;
-}
-
-static int echo_create(const struct lu_env *env, struct obd_export *exp,
-		       struct obdo *oa, struct lov_stripe_md **ea,
-		       struct obd_trans_info *oti)
-{
-	struct obd_device *obd = class_exp2obd(exp);
-
-	if (!obd) {
-		CERROR("invalid client cookie %#llx\n",
-		       exp->exp_handle.h_cookie);
-		return -EINVAL;
-	}
-
-	if (!(oa->o_mode & S_IFMT)) {
-		CERROR("echo obd: no type!\n");
-		return -ENOENT;
-	}
-
-	if (!(oa->o_valid & OBD_MD_FLTYPE)) {
-		CERROR("invalid o_valid %#llx\n", oa->o_valid);
-		return -EINVAL;
-	}
-
-	ostid_set_seq_echo(&oa->o_oi);
-	ostid_set_id(&oa->o_oi, echo_next_id(obd));
-	oa->o_valid = OBD_MD_FLID;
-
-	return 0;
-}
-
-static int echo_destroy(const struct lu_env *env, struct obd_export *exp,
-			struct obdo *oa, struct lov_stripe_md *ea,
-			struct obd_trans_info *oti, struct obd_export *md_exp,
-			void *capa)
-{
-	struct obd_device *obd = class_exp2obd(exp);
-
-	if (!obd) {
-		CERROR("invalid client cookie %#llx\n",
-		       exp->exp_handle.h_cookie);
-		return -EINVAL;
-	}
-
-	if (!(oa->o_valid & OBD_MD_FLID)) {
-		CERROR("obdo missing FLID valid flag: %#llx\n", oa->o_valid);
-		return -EINVAL;
-	}
-
-	if (ostid_id(&oa->o_oi) > obd->u.echo.eo_lastino ||
-	    ostid_id(&oa->o_oi) < ECHO_INIT_OID) {
-		CERROR("bad destroy objid: "DOSTID"\n", POSTID(&oa->o_oi));
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-static int echo_getattr(const struct lu_env *env, struct obd_export *exp,
-			struct obd_info *oinfo)
-{
-	struct obd_device *obd = class_exp2obd(exp);
-	u64 id = ostid_id(&oinfo->oi_oa->o_oi);
-
-	if (!obd) {
-		CERROR("invalid client cookie %#llx\n",
-		       exp->exp_handle.h_cookie);
-		return -EINVAL;
-	}
-
-	if (!(oinfo->oi_oa->o_valid & OBD_MD_FLID)) {
-		CERROR("obdo missing FLID valid flag: %#llx\n",
-		       oinfo->oi_oa->o_valid);
-		return -EINVAL;
-	}
-
-	obdo_cpy_md(oinfo->oi_oa, &obd->u.echo.eo_oa, oinfo->oi_oa->o_valid);
-	ostid_set_seq_echo(&oinfo->oi_oa->o_oi);
-	ostid_set_id(&oinfo->oi_oa->o_oi, id);
-
-	return 0;
-}
-
-static int echo_setattr(const struct lu_env *env, struct obd_export *exp,
-			struct obd_info *oinfo, struct obd_trans_info *oti)
-{
-	struct obd_device *obd = class_exp2obd(exp);
-
-	if (!obd) {
-		CERROR("invalid client cookie %#llx\n",
-		       exp->exp_handle.h_cookie);
-		return -EINVAL;
-	}
-
-	if (!(oinfo->oi_oa->o_valid & OBD_MD_FLID)) {
-		CERROR("obdo missing FLID valid flag: %#llx\n",
-		       oinfo->oi_oa->o_valid);
-		return -EINVAL;
-	}
-
-	memcpy(&obd->u.echo.eo_oa, oinfo->oi_oa, sizeof(*oinfo->oi_oa));
-
-	if (ostid_id(&oinfo->oi_oa->o_oi) & 4) {
-		/* Save lock to force ACKed reply */
-		ldlm_lock_addref (&obd->u.echo.eo_nl_lock, LCK_NL);
-		oti->oti_ack_locks[0].mode = LCK_NL;
-		oti->oti_ack_locks[0].lock = obd->u.echo.eo_nl_lock;
-	}
-
-	return 0;
-}
-
-static void
-echo_page_debug_setup(struct page *page, int rw, u64 id,
-		      __u64 offset, int len)
-{
-	int   page_offset = offset & ~CFS_PAGE_MASK;
-	char *addr	= ((char *)kmap(page)) + page_offset;
-
-	if (len % OBD_ECHO_BLOCK_SIZE != 0)
-		CERROR("Unexpected block size %d\n", len);
-
-	while (len > 0) {
-		if (rw & OBD_BRW_READ)
-			block_debug_setup(addr, OBD_ECHO_BLOCK_SIZE,
-					  offset, id);
-		else
-			block_debug_setup(addr, OBD_ECHO_BLOCK_SIZE,
-					  0xecc0ecc0ecc0ecc0ULL,
-					  0xecc0ecc0ecc0ecc0ULL);
-
-		addr   += OBD_ECHO_BLOCK_SIZE;
-		offset += OBD_ECHO_BLOCK_SIZE;
-		len    -= OBD_ECHO_BLOCK_SIZE;
-	}
-
-	kunmap(page);
-}
-
-static int
-echo_page_debug_check(struct page *page, u64 id,
-		      __u64 offset, int len)
-{
-	int   page_offset = offset & ~CFS_PAGE_MASK;
-	char *addr	= ((char *)kmap(page)) + page_offset;
-	int   rc	  = 0;
-	int   rc2;
-
-	if (len % OBD_ECHO_BLOCK_SIZE != 0)
-		CERROR("Unexpected block size %d\n", len);
-
-	while (len > 0) {
-		rc2 = block_debug_check("echo", addr, OBD_ECHO_BLOCK_SIZE,
-					offset, id);
-
-		if (rc2 != 0 && rc == 0)
-			rc = rc2;
-
-		addr   += OBD_ECHO_BLOCK_SIZE;
-		offset += OBD_ECHO_BLOCK_SIZE;
-		len    -= OBD_ECHO_BLOCK_SIZE;
-	}
-
-	kunmap(page);
-
-	return rc;
-}
-
-/* This allows us to verify that desc_private is passed unmolested */
-#define DESC_PRIV 0x10293847
-
-static int echo_map_nb_to_lb(struct obdo *oa, struct obd_ioobj *obj,
-			     struct niobuf_remote *nb, int *pages,
-			     struct niobuf_local *lb, int cmd, int *left)
-{
-	int gfp_mask = (ostid_id(&obj->ioo_oid) & 1) ?
-			GFP_HIGHUSER : GFP_IOFS;
-	int ispersistent = ostid_id(&obj->ioo_oid) == ECHO_PERSISTENT_OBJID;
-	int debug_setup = (!ispersistent &&
-			   (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
-			   (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
-	struct niobuf_local *res = lb;
-	u64 offset = nb->offset;
-	int len = nb->len;
-
-	while (len > 0) {
-		int plen = PAGE_CACHE_SIZE - (offset & (PAGE_CACHE_SIZE-1));
-		if (len < plen)
-			plen = len;
-
-		/* check for local buf overflow */
-		if (*left == 0)
-			return -EINVAL;
-
-		res->lnb_file_offset = offset;
-		res->len = plen;
-		LASSERT((res->lnb_file_offset & ~CFS_PAGE_MASK) + res->len <=
-			PAGE_CACHE_SIZE);
-
-		if (ispersistent &&
-		    ((res->lnb_file_offset >> PAGE_CACHE_SHIFT) <
-		      ECHO_PERSISTENT_PAGES)) {
-			res->page =
-				echo_persistent_pages[res->lnb_file_offset >>
-						      PAGE_CACHE_SHIFT];
-			/* Take extra ref so __free_pages() can be called OK */
-			get_page (res->page);
-		} else {
-			OBD_PAGE_ALLOC(res->page, gfp_mask);
-			if (res->page == NULL) {
-				CERROR("can't get page for id " DOSTID"\n",
-				       POSTID(&obj->ioo_oid));
-				return -ENOMEM;
-			}
-		}
-
-		CDEBUG(D_PAGE, "$$$$ get page %p @ %llu for %d\n",
-		       res->page, res->lnb_file_offset, res->len);
-
-		if (cmd & OBD_BRW_READ)
-			res->rc = res->len;
-
-		if (debug_setup)
-			echo_page_debug_setup(res->page, cmd,
-					      ostid_id(&obj->ioo_oid),
-					      res->lnb_file_offset, res->len);
-
-		offset += plen;
-		len -= plen;
-		res++;
-
-		(*left)--;
-		(*pages)++;
-	}
-
-	return 0;
-}
-
-static int echo_finalize_lb(struct obdo *oa, struct obd_ioobj *obj,
-			    struct niobuf_remote *rb, int *pgs,
-			    struct niobuf_local *lb, int verify)
-{
-	struct niobuf_local *res = lb;
-	u64 start = rb->offset >> PAGE_CACHE_SHIFT;
-	u64 end = (rb->offset + rb->len + PAGE_CACHE_SIZE - 1) >>
-		  PAGE_CACHE_SHIFT;
-	int count = (int)(end - start);
-	int rc = 0;
-	int i;
-
-	for (i = 0; i < count; i++, (*pgs) ++, res++) {
-		struct page *page = res->page;
-		void       *addr;
-
-		if (page == NULL) {
-			CERROR("null page objid %llu:%p, buf %d/%d\n",
-			       ostid_id(&obj->ioo_oid), page, i,
-			       obj->ioo_bufcnt);
-			return -EFAULT;
-		}
-
-		addr = kmap(page);
-
-		CDEBUG(D_PAGE, "$$$$ use page %p, addr %p@%llu\n",
-		       res->page, addr, res->lnb_file_offset);
-
-		if (verify) {
-			int vrc = echo_page_debug_check(page,
-							ostid_id(&obj->ioo_oid),
-							res->lnb_file_offset,
-							res->len);
-			/* check all the pages always */
-			if (vrc != 0 && rc == 0)
-				rc = vrc;
-		}
-
-		kunmap(page);
-		/* NB see comment above regarding persistent pages */
-		OBD_PAGE_FREE(page);
-	}
-
-	return rc;
-}
-
-static int echo_preprw(const struct lu_env *env, int cmd,
-		       struct obd_export *export, struct obdo *oa,
-		       int objcount, struct obd_ioobj *obj,
-		       struct niobuf_remote *nb, int *pages,
-		       struct niobuf_local *res, struct obd_trans_info *oti,
-		       struct lustre_capa *unused)
-{
-	struct obd_device *obd;
-	int tot_bytes = 0;
-	int rc = 0;
-	int i, left;
-
-	obd = export->exp_obd;
-	if (obd == NULL)
-		return -EINVAL;
-
-	/* Temp fix to stop falling foul of osc_announce_cached() */
-	oa->o_valid &= ~(OBD_MD_FLBLOCKS | OBD_MD_FLGRANT);
-
-	memset(res, 0, sizeof(*res) * *pages);
-
-	CDEBUG(D_PAGE, "%s %d obdos with %d IOs\n",
-	       cmd == OBD_BRW_READ ? "reading" : "writing", objcount, *pages);
-
-	if (oti)
-		oti->oti_handle = (void *)DESC_PRIV;
-
-	left = *pages;
-	*pages = 0;
-
-	for (i = 0; i < objcount; i++, obj++) {
-		int j;
-
-		for (j = 0 ; j < obj->ioo_bufcnt ; j++, nb++) {
-
-			rc = echo_map_nb_to_lb(oa, obj, nb, pages,
-					       res + *pages, cmd, &left);
-			if (rc)
-				GOTO(preprw_cleanup, rc);
-
-			tot_bytes += nb->len;
-		}
-	}
-
-	atomic_add(*pages, &obd->u.echo.eo_prep);
-
-	if (cmd & OBD_BRW_READ)
-		lprocfs_counter_add(obd->obd_stats, LPROC_ECHO_READ_BYTES,
-				    tot_bytes);
-	else
-		lprocfs_counter_add(obd->obd_stats, LPROC_ECHO_WRITE_BYTES,
-				    tot_bytes);
-
-	CDEBUG(D_PAGE, "%d pages allocated after prep\n",
-	       atomic_read(&obd->u.echo.eo_prep));
-
-	return 0;
-
-preprw_cleanup:
-	/* It is possible that we would rather handle errors by  allow
-	 * any already-set-up pages to complete, rather than tearing them
-	 * all down again.  I believe that this is what the in-kernel
-	 * prep/commit operations do.
-	 */
-	CERROR("cleaning up %u pages (%d obdos)\n", *pages, objcount);
-	for (i = 0; i < *pages; i++) {
-		kunmap(res[i].page);
-		/* NB if this is a persistent page, __free_pages will just
-		 * lose the extra ref gained above */
-		OBD_PAGE_FREE(res[i].page);
-		res[i].page = NULL;
-		atomic_dec(&obd->u.echo.eo_prep);
-	}
-
-	return rc;
-}
-
-static int echo_commitrw(const struct lu_env *env, int cmd,
-			 struct obd_export *export, struct obdo *oa,
-			 int objcount, struct obd_ioobj *obj,
-			 struct niobuf_remote *rb, int niocount,
-			 struct niobuf_local *res, struct obd_trans_info *oti,
-			 int rc)
-{
-	struct obd_device *obd;
-	int pgs = 0;
-	int i;
-
-	obd = export->exp_obd;
-	if (obd == NULL)
-		return -EINVAL;
-
-	if (rc)
-		GOTO(commitrw_cleanup, rc);
-
-	if ((cmd & OBD_BRW_RWMASK) == OBD_BRW_READ) {
-		CDEBUG(D_PAGE, "reading %d obdos with %d IOs\n",
-		       objcount, niocount);
-	} else {
-		CDEBUG(D_PAGE, "writing %d obdos with %d IOs\n",
-		       objcount, niocount);
-	}
-
-	if (niocount && res == NULL) {
-		CERROR("NULL res niobuf with niocount %d\n", niocount);
-		return -EINVAL;
-	}
-
-	LASSERT(oti == NULL || oti->oti_handle == (void *)DESC_PRIV);
-
-	for (i = 0; i < objcount; i++, obj++) {
-		int verify = (rc == 0 &&
-			     ostid_id(&obj->ioo_oid) != ECHO_PERSISTENT_OBJID &&
-			      (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
-			      (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
-		int j;
-
-		for (j = 0 ; j < obj->ioo_bufcnt ; j++, rb++) {
-			int vrc = echo_finalize_lb(oa, obj, rb, &pgs, &res[pgs],
-						   verify);
-			if (vrc == 0)
-				continue;
-
-			if (vrc == -EFAULT)
-				GOTO(commitrw_cleanup, rc = vrc);
-
-			if (rc == 0)
-				rc = vrc;
-		}
-
-	}
-
-	atomic_sub(pgs, &obd->u.echo.eo_prep);
-
-	CDEBUG(D_PAGE, "%d pages remain after commit\n",
-	       atomic_read(&obd->u.echo.eo_prep));
-	return rc;
-
-commitrw_cleanup:
-	atomic_sub(pgs, &obd->u.echo.eo_prep);
-
-	CERROR("cleaning up %d pages (%d obdos)\n",
-	       niocount - pgs - 1, objcount);
-
-	while (pgs < niocount) {
-		struct page *page = res[pgs++].page;
-
-		if (page == NULL)
-			continue;
-
-		/* NB see comment above regarding persistent pages */
-		OBD_PAGE_FREE(page);
-		atomic_dec(&obd->u.echo.eo_prep);
-	}
-	return rc;
-}
-
-static int echo_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
-{
-	struct lprocfs_static_vars lvars;
-	int			rc;
-	__u64		      lock_flags = 0;
-	struct ldlm_res_id	 res_id = {.name = {1}};
-	char		       ns_name[48];
-
-	obd->u.echo.eo_obt.obt_magic = OBT_MAGIC;
-	spin_lock_init(&obd->u.echo.eo_lock);
-	obd->u.echo.eo_lastino = ECHO_INIT_OID;
-
-	sprintf(ns_name, "echotgt-%s", obd->obd_uuid.uuid);
-	obd->obd_namespace = ldlm_namespace_new(obd, ns_name,
-						LDLM_NAMESPACE_SERVER,
-						LDLM_NAMESPACE_MODEST,
-						LDLM_NS_TYPE_OST);
-	if (obd->obd_namespace == NULL) {
-		LBUG();
-		return -ENOMEM;
-	}
-
-	rc = ldlm_cli_enqueue_local(obd->obd_namespace, &res_id, LDLM_PLAIN,
-				    NULL, LCK_NL, &lock_flags, NULL,
-				    ldlm_completion_ast, NULL, NULL, 0,
-				    LVB_T_NONE, NULL, &obd->u.echo.eo_nl_lock);
-	LASSERT (rc == ELDLM_OK);
-
-	lprocfs_echo_init_vars(&lvars);
-	if (lprocfs_obd_setup(obd, lvars.obd_vars) == 0 &&
-	    lprocfs_alloc_obd_stats(obd, LPROC_ECHO_LAST) == 0) {
-		lprocfs_counter_init(obd->obd_stats, LPROC_ECHO_READ_BYTES,
-				     LPROCFS_CNTR_AVGMINMAX,
-				     "read_bytes", "bytes");
-		lprocfs_counter_init(obd->obd_stats, LPROC_ECHO_WRITE_BYTES,
-				     LPROCFS_CNTR_AVGMINMAX,
-				     "write_bytes", "bytes");
-	}
-
-	ptlrpc_init_client (LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
-			    "echo_ldlm_cb_client", &obd->obd_ldlm_client);
-	return 0;
-}
-
-static int echo_cleanup(struct obd_device *obd)
-{
-	int leaked;
-
-	lprocfs_obd_cleanup(obd);
-	lprocfs_free_obd_stats(obd);
-
-	ldlm_lock_decref(&obd->u.echo.eo_nl_lock, LCK_NL);
-
-	/* XXX Bug 3413; wait for a bit to ensure the BL callback has
-	 * happened before calling ldlm_namespace_free() */
-	set_current_state(TASK_UNINTERRUPTIBLE);
-	schedule_timeout(cfs_time_seconds(1));
-
-	ldlm_namespace_free(obd->obd_namespace, NULL, obd->obd_force);
-	obd->obd_namespace = NULL;
-
-	leaked = atomic_read(&obd->u.echo.eo_prep);
-	if (leaked != 0)
-		CERROR("%d prep/commitrw pages leaked\n", leaked);
-
-	return 0;
-}
-
-struct obd_ops echo_obd_ops = {
-	.o_owner	   = THIS_MODULE,
-	.o_connect	 = echo_connect,
-	.o_disconnect      = echo_disconnect,
-	.o_init_export     = echo_init_export,
-	.o_destroy_export  = echo_destroy_export,
-	.o_create	  = echo_create,
-	.o_destroy	 = echo_destroy,
-	.o_getattr	 = echo_getattr,
-	.o_setattr	 = echo_setattr,
-	.o_preprw	  = echo_preprw,
-	.o_commitrw	= echo_commitrw,
-	.o_setup	   = echo_setup,
-	.o_cleanup	 = echo_cleanup
-};
-
-void echo_persistent_pages_fini(void)
-{
-	int     i;
-
-	for (i = 0; i < ECHO_PERSISTENT_PAGES; i++)
-		if (echo_persistent_pages[i] != NULL) {
-			OBD_PAGE_FREE(echo_persistent_pages[i]);
-			echo_persistent_pages[i] = NULL;
-		}
-}
-
-int echo_persistent_pages_init(void)
-{
-	struct page *pg;
-	int	  i;
-
-	for (i = 0; i < ECHO_PERSISTENT_PAGES; i++) {
-		int gfp_mask = (i < ECHO_PERSISTENT_PAGES/2) ?
-			GFP_IOFS : GFP_HIGHUSER;
-
-		OBD_PAGE_ALLOC(pg, gfp_mask);
-		if (pg == NULL) {
-			echo_persistent_pages_fini ();
-			return -ENOMEM;
-		}
-
-		memset (kmap (pg), 0, PAGE_CACHE_SIZE);
-		kunmap (pg);
-
-		echo_persistent_pages[i] = pg;
-	}
-
-	return 0;
-}

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