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

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2013, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #define DEBUG_SUBSYSTEM S_LMV
  34 #include <linux/slab.h>
  35 #include <linux/module.h>
  36 #include <linux/pagemap.h>
  37 #include <asm/div64.h>
  38 #include <linux/seq_file.h>
  39
  40 #include "../include/obd_support.h"
  41 #include "../include/lustre/lustre_idl.h"
  42 #include "../include/lustre_fid.h"
  43 #include "../include/lustre_lib.h"
  44 #include "../include/lustre_net.h"
  45 #include "../include/lustre_dlm.h"
  46 #include "../include/obd_class.h"
  47 #include "../include/lprocfs_status.h"
  48 #include "lmv_internal.h"
  49
  50 int lmv_fld_lookup(struct lmv_obd *lmv, const struct lu_fid *fid, u32 *mds)
  51 {
  52         struct obd_device *obd = lmv2obd_dev(lmv);
  53         int rc;
  54
  55         /*
  56          * FIXME: Currently ZFS still use local seq for ROOT unfortunately, and
  57          * this fid_is_local check should be removed once LU-2240 is fixed
  58          */
  59         if (!fid_is_sane(fid) || !(fid_seq_in_fldb(fid_seq(fid)) ||
  60                                    fid_seq_is_local_file(fid_seq(fid)))) {
  61                 CERROR("%s: invalid FID " DFID "\n", obd->obd_name, PFID(fid));
  62                 return -EINVAL;
  63         }
  64
  65         rc = fld_client_lookup(&lmv->lmv_fld, fid_seq(fid), mds,
  66                                LU_SEQ_RANGE_MDT, NULL);
  67         if (rc) {
  68                 CERROR("Error while looking for mds number. Seq %#llx, err = %d\n",
  69                        fid_seq(fid), rc);
  70                 return rc;
  71         }
  72
  73         CDEBUG(D_INODE, "FLD lookup got mds #%x for fid="DFID"\n",
  74                *mds, PFID(fid));
  75
  76         if (*mds >= lmv->desc.ld_tgt_count) {
  77                 CERROR("FLD lookup got invalid mds #%x (max: %x) for fid=" DFID "\n", *mds, lmv->desc.ld_tgt_count,
  78                        PFID(fid));
  79                 rc = -EINVAL;
  80         }
  81         return rc;
  82 }