drivers/staging/lustre/lustre/lmv/lmv_fld.c

/*
 * 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) 2013, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 */

#define DEBUG_SUBSYSTEM S_LMV
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/pagemap.h>
#include <asm/div64.h>
#include <linux/seq_file.h>

#include "../include/obd_support.h"
#include "../include/lustre/lustre_idl.h"
#include "../include/lustre_fid.h"
#include "../include/lustre_lib.h"
#include "../include/lustre_net.h"
#include "../include/lustre_dlm.h"
#include "../include/obd_class.h"
#include "../include/lprocfs_status.h"
#include "lmv_internal.h"

int lmv_fld_lookup(struct lmv_obd *lmv,
		   const struct lu_fid *fid,
		   u32 *mds)
{
	int rc;

	/* FIXME: Currently ZFS still use local seq for ROOT unfortunately, and
	 * this fid_is_local check should be removed once LU-2240 is fixed */
	LASSERTF((fid_seq_in_fldb(fid_seq(fid)) ||
		  fid_seq_is_local_file(fid_seq(fid))) &&
		 fid_is_sane(fid), DFID" is insane!\n", PFID(fid));

	rc = fld_client_lookup(&lmv->lmv_fld, fid_seq(fid), mds,
			       LU_SEQ_RANGE_MDT, NULL);
	if (rc) {
		CERROR("Error while looking for mds number. Seq %#llx, err = %d\n",
		       fid_seq(fid), rc);
		return rc;
	}

	CDEBUG(D_INODE, "FLD lookup got mds #%x for fid="DFID"\n",
	       *mds, PFID(fid));

	if (*mds >= lmv->desc.ld_tgt_count) {
		CERROR("FLD lookup got invalid mds #%x (max: %x) for fid=" DFID "\n", *mds, lmv->desc.ld_tgt_count,
		       PFID(fid));
		rc = -EINVAL;
	}
	return rc;
}