LXR linux/drivers/staging/lustre/lustre/obdclass/local

   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,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License version 2 for more details.  A copy is
  14 * included in the COPYING file that accompanied this code.
  15
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write to the Free Software
  18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19 *
  20 * GPL HEADER END
  21 */
  22/*
  23 * Copyright (c) 2012, Intel Corporation.
  24 */
  25/*
  26 * lustre/obdclass/local_storage.c
  27 *
  28 * Local storage for file/objects with fid generation. Works on top of OSD.
  29 *
  30 * Author: Mikhail Pershin <mike.pershin@intel.com>
  31 */
  32
  33#include <dt_object.h>
  34#include <obd.h>
  35#include <lustre_fid.h>
  36#include <lustre_disk.h>
  37
  38struct ls_device {
  39        struct dt_device         ls_top_dev;
  40        /* all initialized ls_devices on this node linked by this */
  41        struct list_head                 ls_linkage;
  42        /* how many handle's reference this local storage */
  43        atomic_t                 ls_refcount;
  44        /* underlaying OSD device */
  45        struct dt_device        *ls_osd;
  46        /* list of all local OID storages */
  47        struct list_head                 ls_los_list;
  48        struct mutex             ls_los_mutex;
  49};
  50
  51static inline struct ls_device *dt2ls_dev(struct dt_device *d)
  52{
  53        return container_of0(d, struct ls_device, ls_top_dev);
  54}
  55
  56struct ls_object {
  57        struct lu_object_header  ls_header;
  58        struct dt_object         ls_obj;
  59};
  60
  61static inline struct ls_object *lu2ls_obj(struct lu_object *o)
  62{
  63        return container_of0(o, struct ls_object, ls_obj.do_lu);
  64}
  65
  66static inline struct dt_object *ls_locate(const struct lu_env *env,
  67                                          struct ls_device *ls,
  68                                          const struct lu_fid *fid)
  69{
  70        return dt_locate_at(env, ls->ls_osd, fid, &ls->ls_top_dev.dd_lu_dev);
  71}
  72
  73struct ls_device *ls_device_get(struct dt_device *dev);
  74void ls_device_put(const struct lu_env *env, struct ls_device *ls);
  75struct local_oid_storage *dt_los_find(struct ls_device *ls, __u64 seq);
  76void dt_los_put(struct local_oid_storage *los);
  77
  78/* Lustre 2.3 on-disk structure describing local object OIDs storage
  79 * the structure to be used with any sequence managed by
  80 * local object library.
  81 * Obsoleted since 2.4 but is kept for compatibility reasons,
  82 * see lastid_compat_check() in obdclass/local_storage.c */
  83struct los_ondisk {
  84        __u32 lso_magic;
  85        __u32 lso_next_oid;
  86};
  87
  88#define LOS_MAGIC       0xdecafbee
  89