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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2012, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/include/lustre_disk.h
  33  *
  34  * Lustre disk format definitions.
  35  *
  36  * Author: Nathan Rutman <nathan@clusterfs.com>
  37  */
  38
  39 #ifndef _LUSTRE_DISK_H
  40 #define _LUSTRE_DISK_H
  41
  42 /** \defgroup disk disk
  43  *
  44  * @{
  45  */
  46
  47 #include "../../include/linux/libcfs/libcfs.h"
  48 #include "../../include/linux/lnet/types.h"
  49 #include <linux/backing-dev.h>
  50
  51 /****************** persistent mount data *********************/
  52
  53 #define LDD_F_SV_TYPE_MDT   0x0001
  54 #define LDD_F_SV_TYPE_OST   0x0002
  55 #define LDD_F_SV_TYPE_MGS   0x0004
  56 #define LDD_F_SV_TYPE_MASK (LDD_F_SV_TYPE_MDT  | \
  57                             LDD_F_SV_TYPE_OST  | \
  58                             LDD_F_SV_TYPE_MGS)
  59 #define LDD_F_SV_ALL    0x0008
  60
  61 /****************** mount command *********************/
  62
  63 /* The lmd is only used internally by Lustre; mount simply passes
  64  * everything as string options
  65  */
  66
  67 #define LMD_MAGIC    0xbdacbd03
  68 #define LMD_PARAMS_MAXLEN       4096
  69
  70 /* gleaned from the mount command - no persistent info here */
  71 struct lustre_mount_data {
  72         __u32      lmd_magic;
  73         __u32      lmd_flags;    /* lustre mount flags */
  74         int     lmd_mgs_failnodes; /* mgs failover node count */
  75         int     lmd_exclude_count;
  76         int     lmd_recovery_time_soft;
  77         int     lmd_recovery_time_hard;
  78         char      *lmd_dev;        /* device name */
  79         char      *lmd_profile;    /* client only */
  80         char      *lmd_mgssec;  /* sptlrpc flavor to mgs */
  81         char      *lmd_opts;    /* lustre mount options (as opposed to
  82                                  * _device_ mount options)
  83                                  */
  84         char      *lmd_params;  /* lustre params */
  85         __u32     *lmd_exclude; /* array of OSTs to ignore */
  86         char    *lmd_mgs;       /* MGS nid */
  87         char    *lmd_osd_type;  /* OSD type */
  88 };
  89
  90 #define LMD_FLG_SERVER          0x0001  /* Mounting a server */
  91 #define LMD_FLG_CLIENT          0x0002  /* Mounting a client */
  92 #define LMD_FLG_ABORT_RECOV     0x0008  /* Abort recovery */
  93 #define LMD_FLG_NOSVC           0x0010  /* Only start MGS/MGC for servers,
  94                                          * no other services
  95                                          */
  96 #define LMD_FLG_NOMGS           0x0020  /* Only start target for servers,
  97                                          * reusing existing MGS services
  98                                          */
  99 #define LMD_FLG_WRITECONF       0x0040  /* Rewrite config log */
 100 #define LMD_FLG_NOIR            0x0080  /* NO imperative recovery */
 101 #define LMD_FLG_NOSCRUB         0x0100  /* Do not trigger scrub automatically */
 102 #define LMD_FLG_MGS             0x0200  /* Also start MGS along with server */
 103 #define LMD_FLG_IAM             0x0400  /* IAM dir */
 104 #define LMD_FLG_NO_PRIMNODE     0x0800  /* all nodes are service nodes */
 105 #define LMD_FLG_VIRGIN          0x1000  /* the service registers first time */
 106 #define LMD_FLG_UPDATE          0x2000  /* update parameters */
 107 #define LMD_FLG_HSM             0x4000  /* Start coordinator */
 108
 109 #define lmd_is_client(x) ((x)->lmd_flags & LMD_FLG_CLIENT)
 110
 111 /****************** last_rcvd file *********************/
 112
 113 /** version recovery epoch */
 114 #define LR_EPOCH_BITS   32
 115 #define lr_epoch(a) ((a) >> LR_EPOCH_BITS)
 116 #define LR_EXPIRE_INTERVALS 16 /**< number of intervals to track transno */
 117 #define ENOENT_VERSION 1 /** 'virtual' version of non-existent object */
 118
 119 /****************** superblock additional info *********************/
 120
 121 struct ll_sb_info;
 122
 123 struct lustre_sb_info {
 124         int                    lsi_flags;
 125         struct obd_device       *lsi_mgc;     /* mgc obd */
 126         struct lustre_mount_data *lsi_lmd;     /* mount command info */
 127         struct ll_sb_info       *lsi_llsbi;   /* add'l client sbi info */
 128         struct dt_device         *lsi_dt_dev;  /* dt device to access disk fs*/
 129         atomic_t              lsi_mounts;  /* references to the srv_mnt */
 130         char                      lsi_svname[MTI_NAME_MAXLEN];
 131         char                      lsi_osd_obdname[64];
 132         char                      lsi_osd_uuid[64];
 133         struct obd_export        *lsi_osd_exp;
 134         char                      lsi_osd_type[16];
 135         char                      lsi_fstype[16];
 136         struct backing_dev_info   lsi_bdi;     /* each client mountpoint needs
 137                                                 * own backing_dev_info
 138                                                 */
 139 };
 140
 141 #define LSI_UMOUNT_FAILOVER           0x00200000
 142 #define LSI_BDI_INITIALIZED           0x00400000
 143
 144 #define     s2lsi(sb)   ((struct lustre_sb_info *)((sb)->s_fs_info))
 145 #define     s2lsi_nocast(sb) ((sb)->s_fs_info)
 146
 147 #define     get_profile_name(sb)   (s2lsi(sb)->lsi_lmd->lmd_profile)
 148 #define     get_mount_flags(sb)    (s2lsi(sb)->lsi_lmd->lmd_flags)
 149 #define     get_mntdev_name(sb)    (s2lsi(sb)->lsi_lmd->lmd_dev)
 150
 151 /****************** mount lookup info *********************/
 152
 153 struct lustre_mount_info {
 154         char             *lmi_name;
 155         struct super_block   *lmi_sb;
 156         struct list_head            lmi_list_chain;
 157 };
 158
 159 /****************** prototypes *********************/
 160
 161 /* obd_mount.c */
 162
 163 int lustre_start_mgc(struct super_block *sb);
 164 void lustre_register_client_fill_super(int (*cfs)(struct super_block *sb,
 165                                                   struct vfsmount *mnt));
 166 void lustre_register_kill_super_cb(void (*cfs)(struct super_block *sb));
 167 int lustre_common_put_super(struct super_block *sb);
 168
 169 int mgc_fsname2resid(char *fsname, struct ldlm_res_id *res_id, int type);
 170
 171 /** @} disk */
 172
 173 #endif /* _LUSTRE_DISK_H */