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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2013, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LMV
  38 #include <linux/slab.h>
  39 #include <linux/module.h>
  40 #include <linux/init.h>
  41 #include <linux/pagemap.h>
  42 #include <asm/div64.h>
  43 #include <linux/seq_file.h>
  44
  45 #include <obd_support.h>
  46 #include <lustre/lustre_idl.h>
  47 #include <lustre_fid.h>
  48 #include <lustre_lib.h>
  49 #include <lustre_net.h>
  50 #include <lustre_dlm.h>
  51 #include <obd_class.h>
  52 #include <lprocfs_status.h>
  53 #include "lmv_internal.h"
  54
  55 int lmv_fld_lookup(struct lmv_obd *lmv,
  56                    const struct lu_fid *fid,
  57                    mdsno_t *mds)
  58 {
  59         int rc;
  60
  61         /* FIXME: Currently ZFS still use local seq for ROOT unfortunately, and
  62          * this fid_is_local check should be removed once LU-2240 is fixed */
  63         LASSERTF((fid_seq_in_fldb(fid_seq(fid)) ||
  64                   fid_seq_is_local_file(fid_seq(fid))) &&
  65                  fid_is_sane(fid), DFID" is insane!\n", PFID(fid));
  66
  67         rc = fld_client_lookup(&lmv->lmv_fld, fid_seq(fid), mds,
  68                                LU_SEQ_RANGE_MDT, NULL);
  69         if (rc) {
  70                 CERROR("Error while looking for mds number. Seq "LPX64
  71                        ", err = %d\n", fid_seq(fid), rc);
  72                 return rc;
  73         }
  74
  75         CDEBUG(D_INODE, "FLD lookup got mds #%x for fid="DFID"\n",
  76                *mds, PFID(fid));
  77
  78         if (*mds >= lmv->desc.ld_tgt_count) {
  79                 CERROR("FLD lookup got invalid mds #%x (max: %x) "
  80                        "for fid="DFID"\n", *mds, lmv->desc.ld_tgt_count,
  81                        PFID(fid));
  82                 rc = -EINVAL;
  83         }
  84         return rc;
  85 }