drivers/staging/lustre/lustre/include/lustre_disk.h

   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) 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  * lustre/include/lustre_disk.h
  37  *
  38  * Lustre disk format definitions.
  39  *
  40  * Author: Nathan Rutman <nathan@clusterfs.com>
  41  */
  42
  43 #ifndef _LUSTRE_DISK_H
  44 #define _LUSTRE_DISK_H
  45
  46 /** \defgroup disk disk
  47  *
  48  * @{
  49  */
  50
  51 #include "../../include/linux/libcfs/libcfs.h"
  52 #include "../../include/linux/lnet/types.h"
  53 #include <linux/backing-dev.h>
  54
  55 /****************** persistent mount data *********************/
  56
  57 #define LDD_F_SV_TYPE_MDT   0x0001
  58 #define LDD_F_SV_TYPE_OST   0x0002
  59 #define LDD_F_SV_TYPE_MGS   0x0004
  60 #define LDD_F_SV_TYPE_MASK (LDD_F_SV_TYPE_MDT  | \
  61                             LDD_F_SV_TYPE_OST  | \
  62                             LDD_F_SV_TYPE_MGS)
  63 #define LDD_F_SV_ALL    0x0008
  64
  65 /****************** mount command *********************/
  66
  67 /* The lmd is only used internally by Lustre; mount simply passes
  68  * everything as string options
  69  */
  70
  71 #define LMD_MAGIC    0xbdacbd03
  72 #define LMD_PARAMS_MAXLEN       4096
  73
  74 /* gleaned from the mount command - no persistent info here */
  75 struct lustre_mount_data {
  76         __u32      lmd_magic;
  77         __u32      lmd_flags;    /* lustre mount flags */
  78         int     lmd_mgs_failnodes; /* mgs failover node count */
  79         int     lmd_exclude_count;
  80         int     lmd_recovery_time_soft;
  81         int     lmd_recovery_time_hard;
  82         char      *lmd_dev;        /* device name */
  83         char      *lmd_profile;    /* client only */
  84         char      *lmd_mgssec;  /* sptlrpc flavor to mgs */
  85         char      *lmd_opts;    /* lustre mount options (as opposed to
  86                                  * _device_ mount options)
  87                                  */
  88         char      *lmd_params;  /* lustre params */
  89         __u32     *lmd_exclude; /* array of OSTs to ignore */
  90         char    *lmd_mgs;       /* MGS nid */
  91         char    *lmd_osd_type;  /* OSD type */
  92 };
  93
  94 #define LMD_FLG_SERVER          0x0001  /* Mounting a server */
  95 #define LMD_FLG_CLIENT          0x0002  /* Mounting a client */
  96 #define LMD_FLG_ABORT_RECOV     0x0008  /* Abort recovery */
  97 #define LMD_FLG_NOSVC           0x0010  /* Only start MGS/MGC for servers,
  98                                          * no other services
  99                                          */
 100 #define LMD_FLG_NOMGS           0x0020  /* Only start target for servers,
 101                                          * reusing existing MGS services
 102                                          */
 103 #define LMD_FLG_WRITECONF       0x0040  /* Rewrite config log */
 104 #define LMD_FLG_NOIR            0x0080  /* NO imperative recovery */
 105 #define LMD_FLG_NOSCRUB         0x0100  /* Do not trigger scrub automatically */
 106 #define LMD_FLG_MGS             0x0200  /* Also start MGS along with server */
 107 #define LMD_FLG_IAM             0x0400  /* IAM dir */
 108 #define LMD_FLG_NO_PRIMNODE     0x0800  /* all nodes are service nodes */
 109 #define LMD_FLG_VIRGIN          0x1000  /* the service registers first time */
 110 #define LMD_FLG_UPDATE          0x2000  /* update parameters */
 111 #define LMD_FLG_HSM             0x4000  /* Start coordinator */
 112
 113 #define lmd_is_client(x) ((x)->lmd_flags & LMD_FLG_CLIENT)
 114
 115 /****************** last_rcvd file *********************/
 116
 117 /** version recovery epoch */
 118 #define LR_EPOCH_BITS   32
 119 #define lr_epoch(a) ((a) >> LR_EPOCH_BITS)
 120 #define LR_EXPIRE_INTERVALS 16 /**< number of intervals to track transno */
 121 #define ENOENT_VERSION 1 /** 'virtual' version of non-existent object */
 122
 123 /****************** superblock additional info *********************/
 124
 125 struct ll_sb_info;
 126
 127 struct lustre_sb_info {
 128         int                    lsi_flags;
 129         struct obd_device       *lsi_mgc;     /* mgc obd */
 130         struct lustre_mount_data *lsi_lmd;     /* mount command info */
 131         struct ll_sb_info       *lsi_llsbi;   /* add'l client sbi info */
 132         struct dt_device         *lsi_dt_dev;  /* dt device to access disk fs*/
 133         atomic_t              lsi_mounts;  /* references to the srv_mnt */
 134         char                      lsi_svname[MTI_NAME_MAXLEN];
 135         char                      lsi_osd_obdname[64];
 136         char                      lsi_osd_uuid[64];
 137         struct obd_export        *lsi_osd_exp;
 138         char                      lsi_osd_type[16];
 139         char                      lsi_fstype[16];
 140         struct backing_dev_info   lsi_bdi;     /* each client mountpoint needs
 141                                                 * own backing_dev_info
 142                                                 */
 143 };
 144
 145 #define LSI_UMOUNT_FAILOVER           0x00200000
 146 #define LSI_BDI_INITIALIZED           0x00400000
 147
 148 #define     s2lsi(sb)   ((struct lustre_sb_info *)((sb)->s_fs_info))
 149 #define     s2lsi_nocast(sb) ((sb)->s_fs_info)
 150
 151 #define     get_profile_name(sb)   (s2lsi(sb)->lsi_lmd->lmd_profile)
 152 #define     get_mount_flags(sb)    (s2lsi(sb)->lsi_lmd->lmd_flags)
 153 #define     get_mntdev_name(sb)    (s2lsi(sb)->lsi_lmd->lmd_dev)
 154
 155 /****************** mount lookup info *********************/
 156
 157 struct lustre_mount_info {
 158         char             *lmi_name;
 159         struct super_block   *lmi_sb;
 160         struct list_head            lmi_list_chain;
 161 };
 162
 163 /****************** prototypes *********************/
 164
 165 /* obd_mount.c */
 166
 167 int lustre_start_mgc(struct super_block *sb);
 168 void lustre_register_client_fill_super(int (*cfs)(struct super_block *sb,
 169                                                   struct vfsmount *mnt));
 170 void lustre_register_kill_super_cb(void (*cfs)(struct super_block *sb));
 171 int lustre_common_put_super(struct super_block *sb);
 172
 173 int mgc_fsname2resid(char *fsname, struct ldlm_res_id *res_id, int type);
 174
 175 /** @} disk */
 176
 177 #endif /* _LUSTRE_DISK_H */