drivers/staging/lustre/lustre/lclient/lcommon_misc.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) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, 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  * cl code shared between vvp and liblustre (and other Lustre clients in the
  37  * future).
  38  *
  39  */
  40 #include <obd_class.h>
  41 #include <obd_support.h>
  42 #include <obd.h>
  43 #include <cl_object.h>
  44 #include <lclient.h>
  45
  46 #include <lustre_lite.h>
  47
  48
  49 /* Initialize the default and maximum LOV EA and cookie sizes.  This allows
  50  * us to make MDS RPCs with large enough reply buffers to hold the
  51  * maximum-sized (= maximum striped) EA and cookie without having to
  52  * calculate this (via a call into the LOV + OSCs) each time we make an RPC. */
  53 int cl_init_ea_size(struct obd_export *md_exp, struct obd_export *dt_exp)
  54 {
  55         struct lov_stripe_md lsm = { .lsm_magic = LOV_MAGIC_V3 };
  56         __u32 valsize = sizeof(struct lov_desc);
  57         int rc, easize, def_easize, cookiesize;
  58         struct lov_desc desc;
  59         __u16 stripes;
  60
  61         rc = obd_get_info(NULL, dt_exp, sizeof(KEY_LOVDESC), KEY_LOVDESC,
  62                           &valsize, &desc, NULL);
  63         if (rc)
  64                 RETURN(rc);
  65
  66         stripes = min(desc.ld_tgt_count, (__u32)LOV_MAX_STRIPE_COUNT);
  67         lsm.lsm_stripe_count = stripes;
  68         easize = obd_size_diskmd(dt_exp, &lsm);
  69
  70         lsm.lsm_stripe_count = desc.ld_default_stripe_count;
  71         def_easize = obd_size_diskmd(dt_exp, &lsm);
  72
  73         cookiesize = stripes * sizeof(struct llog_cookie);
  74
  75         CDEBUG(D_HA, "updating max_mdsize/max_cookiesize: %d/%d\n",
  76                easize, cookiesize);
  77
  78         rc = md_init_ea_size(md_exp, easize, def_easize, cookiesize);
  79         RETURN(rc);
  80 }
  81
  82 /**
  83  * This function is used as an upcall-callback hooked by liblustre and llite
  84  * clients into obd_notify() listeners chain to handle notifications about
  85  * change of import connect_flags. See llu_fsswop_mount() and
  86  * lustre_common_fill_super().
  87  */
  88 int cl_ocd_update(struct obd_device *host,
  89                   struct obd_device *watched,
  90                   enum obd_notify_event ev, void *owner, void *data)
  91 {
  92         struct lustre_client_ocd *lco;
  93         struct client_obd       *cli;
  94         __u64 flags;
  95         int   result;
  96
  97         if (!strcmp(watched->obd_type->typ_name, LUSTRE_OSC_NAME)) {
  98                 cli = &watched->u.cli;
  99                 lco = owner;
 100                 flags = cli->cl_import->imp_connect_data.ocd_connect_flags;
 101                 CDEBUG(D_SUPER, "Changing connect_flags: "LPX64" -> "LPX64"\n",
 102                        lco->lco_flags, flags);
 103                 mutex_lock(&lco->lco_lock);
 104                 lco->lco_flags &= flags;
 105                 /* for each osc event update ea size */
 106                 if (lco->lco_dt_exp)
 107                         cl_init_ea_size(lco->lco_md_exp, lco->lco_dt_exp);
 108
 109                 mutex_unlock(&lco->lco_lock);
 110                 result = 0;
 111         } else {
 112                 CERROR("unexpected notification from %s %s!\n",
 113                        watched->obd_type->typ_name,
 114                        watched->obd_name);
 115                 result = -EINVAL;
 116         }
 117         RETURN(result);
 118 }
 119
 120 #define GROUPLOCK_SCOPE "grouplock"
 121
 122 int cl_get_grouplock(struct cl_object *obj, unsigned long gid, int nonblock,
 123                      struct ccc_grouplock *cg)
 124 {
 125         struct lu_env     *env;
 126         struct cl_io       *io;
 127         struct cl_lock   *lock;
 128         struct cl_lock_descr   *descr;
 129         __u32              enqflags;
 130         int                  refcheck;
 131         int                  rc;
 132
 133         env = cl_env_get(&refcheck);
 134         if (IS_ERR(env))
 135                 return PTR_ERR(env);
 136
 137         io = ccc_env_thread_io(env);
 138         io->ci_obj = obj;
 139         io->ci_ignore_layout = 1;
 140
 141         rc = cl_io_init(env, io, CIT_MISC, io->ci_obj);
 142         if (rc) {
 143                 LASSERT(rc < 0);
 144                 cl_env_put(env, &refcheck);
 145                 return rc;
 146         }
 147
 148         descr = &ccc_env_info(env)->cti_descr;
 149         descr->cld_obj = obj;
 150         descr->cld_start = 0;
 151         descr->cld_end = CL_PAGE_EOF;
 152         descr->cld_gid = gid;
 153         descr->cld_mode = CLM_GROUP;
 154
 155         enqflags = CEF_MUST | (nonblock ? CEF_NONBLOCK : 0);
 156         descr->cld_enq_flags = enqflags;
 157
 158         lock = cl_lock_request(env, io, descr, GROUPLOCK_SCOPE, current);
 159         if (IS_ERR(lock)) {
 160                 cl_io_fini(env, io);
 161                 cl_env_put(env, &refcheck);
 162                 return PTR_ERR(lock);
 163         }
 164
 165         cg->cg_env  = cl_env_get(&refcheck);
 166         cg->cg_io   = io;
 167         cg->cg_lock = lock;
 168         cg->cg_gid  = gid;
 169         LASSERT(cg->cg_env == env);
 170
 171         cl_env_unplant(env, &refcheck);
 172         return 0;
 173 }
 174
 175 void cl_put_grouplock(struct ccc_grouplock *cg)
 176 {
 177         struct lu_env  *env  = cg->cg_env;
 178         struct cl_io   *io   = cg->cg_io;
 179         struct cl_lock *lock = cg->cg_lock;
 180         int          refcheck;
 181
 182         LASSERT(cg->cg_env);
 183         LASSERT(cg->cg_gid);
 184
 185         cl_env_implant(env, &refcheck);
 186         cl_env_put(env, &refcheck);
 187
 188         cl_unuse(env, lock);
 189         cl_lock_release(env, lock, GROUPLOCK_SCOPE, current);
 190         cl_io_fini(env, io);
 191         cl_env_put(env, NULL);
 192 }