lustre/lov/lovsub_dev.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 /*
   4  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
   5  * Use is subject to license terms.
   6  *
   7  * Copyright (c) 2013, 2015, Intel Corporation.
   8  */
   9
  10 /*
  11  * This file is part of Lustre, http://www.lustre.org/
  12  *
  13  * Implementation of cl_device and cl_device_type for LOVSUB layer.
  14  *
  15  * Author: Nikita Danilov <nikita.danilov@sun.com>
  16  */
  17
  18 #define DEBUG_SUBSYSTEM S_LOV
  19
  20 #include "lov_cl_internal.h"
  21
  22 /** \addtogroup lov
  23  *  @{
  24  */
  25
  26 /**
  27  * Lov-sub device and device type functions.
  28  */
  29 static int lovsub_device_init(const struct lu_env *env, struct lu_device *d,
  30                               const char *name, struct lu_device *next)
  31 {
  32         struct lovsub_device  *lsd = lu2lovsub_dev(d);
  33         struct lu_device_type *ldt;
  34         int rc;
  35
  36         ENTRY;
  37         next->ld_site = d->ld_site;
  38         ldt = next->ld_type;
  39         LASSERT(ldt != NULL);
  40         rc = ldto_device_init(env, next, ldt->ldt_name, NULL);
  41         if (rc) {
  42                 next->ld_site = NULL;
  43                 RETURN(rc);
  44         }
  45
  46         lu_device_get(next);
  47         lsd->acid_next = lu2cl_dev(next);
  48         RETURN(rc);
  49 }
  50
  51 static struct lu_device *lovsub_device_fini(const struct lu_env *env,
  52                                             struct lu_device *d)
  53 {
  54         struct lu_device *next;
  55         struct lovsub_device *lsd;
  56
  57         ENTRY;
  58         lsd = lu2lovsub_dev(d);
  59         next = cl2lu_dev(lsd->acid_next);
  60         lsd->acid_next = NULL;
  61         RETURN(next);
  62 }
  63
  64 static struct lu_device *lovsub_device_free(const struct lu_env *env,
  65                                             struct lu_device *d)
  66 {
  67         struct lovsub_device *lsd = lu2lovsub_dev(d);
  68         struct lu_device *next = cl2lu_dev(lsd->acid_next);
  69
  70         lu_site_print(env, d->ld_site, &d->ld_ref, D_ERROR, lu_cdebug_printer);
  71         cl_device_fini(lu2cl_dev(d));
  72         OBD_FREE_PTR(lsd);
  73         return next;
  74 }
  75
  76 static const struct lu_device_operations lovsub_lu_ops = {
  77         .ldo_object_alloc      = lovsub_object_alloc,
  78         .ldo_process_config    = NULL,
  79         .ldo_recovery_complete = NULL
  80 };
  81
  82 static struct lu_device *lovsub_device_alloc(const struct lu_env *env,
  83                                              struct lu_device_type *t,
  84                                              struct lustre_cfg *cfg)
  85 {
  86         struct lu_device *d;
  87         struct lovsub_device *lsd;
  88
  89         OBD_ALLOC_PTR(lsd);
  90         if (lsd) {
  91                 int result;
  92
  93                 result = cl_device_init(&lsd->acid_cl, t);
  94                 if (result == 0) {
  95                         d = lovsub2lu_dev(lsd);
  96                         d->ld_ops         = &lovsub_lu_ops;
  97                 } else
  98                         d = ERR_PTR(result);
  99         } else
 100                 d = ERR_PTR(-ENOMEM);
 101         return d;
 102 }
 103
 104 static const struct lu_device_type_operations lovsub_device_type_ops = {
 105         .ldto_device_alloc = lovsub_device_alloc,
 106         .ldto_device_free = lovsub_device_free,
 107
 108         .ldto_device_init = lovsub_device_init,
 109         .ldto_device_fini = lovsub_device_fini
 110 };
 111
 112 #define LUSTRE_LOVSUB_NAME         "lovsub"
 113
 114 struct lu_device_type lovsub_device_type = {
 115         .ldt_tags     = LU_DEVICE_CL,
 116         .ldt_name     = LUSTRE_LOVSUB_NAME,
 117         .ldt_ops      = &lovsub_device_type_ops,
 118         .ldt_ctx_tags = LCT_CL_THREAD
 119 };
 120
 121
 122 /** @} lov */
 123