Commit 973dbcbb authored by Julia Lawall's avatar Julia Lawall Committed by Greg Kroah-Hartman
Browse files

staging: lustre: obdech: remove unused file 



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

Signed-off-by: default avatarJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d5fdc207

drivers/staging/lustre/lustre/obdecho/echo.c

deleted100644 → 0
+0 −672
Original line number Original line Diff line number Diff line 
/*

 * 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@clusterfs.com>

 * Author: Andreas Dilger <adilger@clusterfs.com>

 */



#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;

}