LXR linux/drivers/staging/lustre/lustre/include/lustre

   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/****************** on-disk files *********************/
  56
  57#define MDT_LOGS_DIR            "LOGS"  /* COMPAT_146 */
  58#define MOUNT_CONFIGS_DIR       "CONFIGS"
  59#define CONFIGS_FILE            "mountdata"
  60/** Persistent mount data are stored on the disk in this file. */
  61#define MOUNT_DATA_FILE         MOUNT_CONFIGS_DIR"/"CONFIGS_FILE
  62#define LAST_RCVD               "last_rcvd"
  63#define LOV_OBJID               "lov_objid"
  64#define LOV_OBJSEQ              "lov_objseq"
  65#define HEALTH_CHECK            "health_check"
  66#define CAPA_KEYS               "capa_keys"
  67#define CHANGELOG_USERS         "changelog_users"
  68#define MGS_NIDTBL_DIR          "NIDTBL_VERSIONS"
  69#define QMT_DIR                 "quota_master"
  70#define QSD_DIR                 "quota_slave"
  71#define HSM_ACTIONS             "hsm_actions"
  72
  73/****************** persistent mount data *********************/
  74
  75#define LDD_F_SV_TYPE_MDT   0x0001
  76#define LDD_F_SV_TYPE_OST   0x0002
  77#define LDD_F_SV_TYPE_MGS   0x0004
  78#define LDD_F_SV_TYPE_MASK (LDD_F_SV_TYPE_MDT  | \
  79                            LDD_F_SV_TYPE_OST  | \
  80                            LDD_F_SV_TYPE_MGS)
  81#define LDD_F_SV_ALL    0x0008
  82/** need an index assignment */
  83#define LDD_F_NEED_INDEX    0x0010
  84/** never registered */
  85#define LDD_F_VIRGIN    0x0020
  86/** update the config logs for this server */
  87#define LDD_F_UPDATE    0x0040
  88/** rewrite the LDD */
  89#define LDD_F_REWRITE_LDD   0x0080
  90/** regenerate config logs for this fs or server */
  91#define LDD_F_WRITECONF     0x0100
  92/** COMPAT_14 */
  93#define LDD_F_UPGRADE14     0x0200
  94/** process as lctl conf_param */
  95#define LDD_F_PARAM      0x0400
  96/** all nodes are specified as service nodes */
  97#define LDD_F_NO_PRIMNODE   0x1000
  98/** IR enable flag */
  99#define LDD_F_IR_CAPABLE    0x2000
 100/** the MGS refused to register the target. */
 101#define LDD_F_ERROR      0x4000
 102/** process at lctl conf_param */
 103#define LDD_F_PARAM2            0x8000
 104
 105/* opc for target register */
 106#define LDD_F_OPC_REG   0x10000000
 107#define LDD_F_OPC_UNREG 0x20000000
 108#define LDD_F_OPC_READY 0x40000000
 109#define LDD_F_OPC_MASK  0xf0000000
 110
 111#define LDD_F_ONDISK_MASK  (LDD_F_SV_TYPE_MASK)
 112
 113#define LDD_F_MASK        0xFFFF
 114
 115enum ldd_mount_type {
 116        LDD_MT_EXT3 = 0,
 117        LDD_MT_LDISKFS,
 118        LDD_MT_SMFS,
 119        LDD_MT_REISERFS,
 120        LDD_MT_LDISKFS2,
 121        LDD_MT_ZFS,
 122        LDD_MT_LAST
 123};
 124
 125static inline char *mt_str(enum ldd_mount_type mt)
 126{
 127        static char *mount_type_string[] = {
 128                "ext3",
 129                "ldiskfs",
 130                "smfs",
 131                "reiserfs",
 132                "ldiskfs2",
 133                "zfs",
 134        };
 135        return mount_type_string[mt];
 136}
 137
 138static inline char *mt_type(enum ldd_mount_type mt)
 139{
 140        static char *mount_type_string[] = {
 141                "osd-ldiskfs",
 142                "osd-ldiskfs",
 143                "osd-smfs",
 144                "osd-reiserfs",
 145                "osd-ldiskfs",
 146                "osd-zfs",
 147        };
 148        return mount_type_string[mt];
 149}
 150
 151#define LDD_INCOMPAT_SUPP 0
 152#define LDD_ROCOMPAT_SUPP 0
 153
 154#define LDD_MAGIC 0x1dd00001
 155
 156/* On-disk configuration file. In host-endian order. */
 157struct lustre_disk_data {
 158        __u32      ldd_magic;
 159        __u32      ldd_feature_compat;  /* compatible feature flags */
 160        __u32      ldd_feature_rocompat;/* read-only compatible feature flags */
 161        __u32      ldd_feature_incompat;/* incompatible feature flags */
 162
 163        __u32      ldd_config_ver;      /* config rewrite count - not used */
 164        __u32      ldd_flags;      /* LDD_SV_TYPE */
 165        __u32      ldd_svindex;  /* server index (0001), must match
 166                                           svname */
 167        __u32      ldd_mount_type;      /* target fs type LDD_MT_* */
 168        char       ldd_fsname[64];      /* filesystem this server is part of,
 169                                           MTI_NAME_MAXLEN */
 170        char       ldd_svname[64];      /* this server's name (lustre-mdt0001)*/
 171        __u8       ldd_uuid[40];        /* server UUID (COMPAT_146) */
 172
 173/*200*/ char       ldd_userdata[1024 - 200]; /* arbitrary user string */
 174/*1024*/__u8       ldd_padding[4096 - 1024];
 175/*4096*/char       ldd_mount_opts[4096]; /* target fs mount opts */
 176/*8192*/char       ldd_params[4096];     /* key=value pairs */
 177};
 178
 179
 180#define IS_MDT(data)    ((data)->lsi_flags & LDD_F_SV_TYPE_MDT)
 181#define IS_OST(data)    ((data)->lsi_flags & LDD_F_SV_TYPE_OST)
 182#define IS_MGS(data)    ((data)->lsi_flags & LDD_F_SV_TYPE_MGS)
 183#define IS_SERVER(data) ((data)->lsi_flags & (LDD_F_SV_TYPE_MGS | \
 184                         LDD_F_SV_TYPE_MDT | LDD_F_SV_TYPE_OST))
 185#define MT_STR(data)    mt_str((data)->ldd_mount_type)
 186
 187/* Make the mdt/ost server obd name based on the filesystem name */
 188static inline int server_make_name(__u32 flags, __u16 index, char *fs,
 189                                   char *name)
 190{
 191        if (flags & (LDD_F_SV_TYPE_MDT | LDD_F_SV_TYPE_OST)) {
 192                if (!(flags & LDD_F_SV_ALL))
 193                        sprintf(name, "%.8s%c%s%04x", fs,
 194                                (flags & LDD_F_VIRGIN) ? ':' :
 195                                        ((flags & LDD_F_WRITECONF) ? '=' : '-'),
 196                                (flags & LDD_F_SV_TYPE_MDT) ? "MDT" : "OST",
 197                                index);
 198        } else if (flags & LDD_F_SV_TYPE_MGS) {
 199                sprintf(name, "MGS");
 200        } else {
 201                CERROR("unknown server type %#x\n", flags);
 202                return 1;
 203        }
 204        return 0;
 205}
 206
 207/****************** mount command *********************/
 208
 209/* The lmd is only used internally by Lustre; mount simply passes
 210   everything as string options */
 211
 212#define LMD_MAGIC    0xbdacbd03
 213
 214/* gleaned from the mount command - no persistent info here */
 215struct lustre_mount_data {
 216        __u32      lmd_magic;
 217        __u32      lmd_flags;    /* lustre mount flags */
 218        int     lmd_mgs_failnodes; /* mgs failover node count */
 219        int     lmd_exclude_count;
 220        int     lmd_recovery_time_soft;
 221        int     lmd_recovery_time_hard;
 222        char      *lmd_dev;        /* device name */
 223        char      *lmd_profile;       /* client only */
 224        char      *lmd_mgssec;  /* sptlrpc flavor to mgs */
 225        char      *lmd_opts;      /* lustre mount options (as opposed to
 226                                         _device_ mount options) */
 227        char      *lmd_params;  /* lustre params */
 228        __u32     *lmd_exclude;       /* array of OSTs to ignore */
 229        char    *lmd_mgs;          /* MGS nid */
 230        char    *lmd_osd_type;      /* OSD type */
 231};
 232
 233#define LMD_FLG_SERVER          0x0001  /* Mounting a server */
 234#define LMD_FLG_CLIENT          0x0002  /* Mounting a client */
 235#define LMD_FLG_ABORT_RECOV     0x0008  /* Abort recovery */
 236#define LMD_FLG_NOSVC           0x0010  /* Only start MGS/MGC for servers,
 237                                           no other services */
 238#define LMD_FLG_NOMGS           0x0020  /* Only start target for servers, reusing
 239                                           existing MGS services */
 240#define LMD_FLG_WRITECONF       0x0040  /* Rewrite config log */
 241#define LMD_FLG_NOIR            0x0080  /* NO imperative recovery */
 242#define LMD_FLG_NOSCRUB         0x0100  /* Do not trigger scrub automatically */
 243#define LMD_FLG_MGS             0x0200  /* Also start MGS along with server */
 244#define LMD_FLG_IAM             0x0400  /* IAM dir */
 245#define LMD_FLG_NO_PRIMNODE     0x0800  /* all nodes are service nodes */
 246#define LMD_FLG_VIRGIN          0x1000  /* the service registers first time */
 247#define LMD_FLG_UPDATE          0x2000  /* update parameters */
 248#define LMD_FLG_HSM             0x4000  /* Start coordinator */
 249
 250#define lmd_is_client(x) ((x)->lmd_flags & LMD_FLG_CLIENT)
 251
 252
 253/****************** last_rcvd file *********************/
 254
 255/** version recovery epoch */
 256#define LR_EPOCH_BITS   32
 257#define lr_epoch(a) ((a) >> LR_EPOCH_BITS)
 258#define LR_EXPIRE_INTERVALS 16 /**< number of intervals to track transno */
 259#define ENOENT_VERSION 1 /** 'virtual' version of non-existent object */
 260
 261#define LR_SERVER_SIZE   512
 262#define LR_CLIENT_START 8192
 263#define LR_CLIENT_SIZE   128
 264#if LR_CLIENT_START < LR_SERVER_SIZE
 265#error "Can't have LR_CLIENT_START < LR_SERVER_SIZE"
 266#endif
 267
 268/*
 269 * This limit is arbitrary (131072 clients on x86), but it is convenient to use
 270 * 2^n * PAGE_CACHE_SIZE * 8 for the number of bits that fit an order-n allocation.
 271 * If we need more than 131072 clients (order-2 allocation on x86) then this
 272 * should become an array of single-page pointers that are allocated on demand.
 273 */
 274#if (128 * 1024UL) > (PAGE_CACHE_SIZE * 8)
 275#define LR_MAX_CLIENTS (128 * 1024UL)
 276#else
 277#define LR_MAX_CLIENTS (PAGE_CACHE_SIZE * 8)
 278#endif
 279
 280/** COMPAT_146: this is an OST (temporary) */
 281#define OBD_COMPAT_OST    0x00000002
 282/** COMPAT_146: this is an MDT (temporary) */
 283#define OBD_COMPAT_MDT    0x00000004
 284/** 2.0 server, interop flag to show server version is changed */
 285#define OBD_COMPAT_20      0x00000008
 286
 287/** MDS handles LOV_OBJID file */
 288#define OBD_ROCOMPAT_LOVOBJID   0x00000001
 289
 290/** OST handles group subdirs */
 291#define OBD_INCOMPAT_GROUPS     0x00000001
 292/** this is an OST */
 293#define OBD_INCOMPAT_OST        0x00000002
 294/** this is an MDT */
 295#define OBD_INCOMPAT_MDT        0x00000004
 296/** common last_rvcd format */
 297#define OBD_INCOMPAT_COMMON_LR  0x00000008
 298/** FID is enabled */
 299#define OBD_INCOMPAT_FID        0x00000010
 300/** Size-on-MDS is enabled */
 301#define OBD_INCOMPAT_SOM        0x00000020
 302/** filesystem using iam format to store directory entries */
 303#define OBD_INCOMPAT_IAM_DIR    0x00000040
 304/** LMA attribute contains per-inode incompatible flags */
 305#define OBD_INCOMPAT_LMA        0x00000080
 306/** lmm_stripe_count has been shrunk from __u32 to __u16 and the remaining 16
 307 * bits are now used to store a generation. Once we start changing the layout
 308 * and bumping the generation, old versions expecting a 32-bit lmm_stripe_count
 309 * will be confused by interpreting stripe_count | gen << 16 as the actual
 310 * stripe count */
 311#define OBD_INCOMPAT_LMM_VER    0x00000100
 312/** multiple OI files for MDT */
 313#define OBD_INCOMPAT_MULTI_OI   0x00000200
 314
 315/* Data stored per server at the head of the last_rcvd file.  In le32 order.
 316   This should be common to filter_internal.h, lustre_mds.h */
 317struct lr_server_data {
 318        __u8  lsd_uuid[40];     /* server UUID */
 319        __u64 lsd_last_transno;    /* last completed transaction ID */
 320        __u64 lsd_compat14;     /* reserved - compat with old last_rcvd */
 321        __u64 lsd_mount_count;     /* incarnation number */
 322        __u32 lsd_feature_compat;  /* compatible feature flags */
 323        __u32 lsd_feature_rocompat;/* read-only compatible feature flags */
 324        __u32 lsd_feature_incompat;/* incompatible feature flags */
 325        __u32 lsd_server_size;     /* size of server data area */
 326        __u32 lsd_client_start;    /* start of per-client data area */
 327        __u16 lsd_client_size;     /* size of per-client data area */
 328        __u16 lsd_subdir_count;    /* number of subdirectories for objects */
 329        __u64 lsd_catalog_oid;     /* recovery catalog object id */
 330        __u32 lsd_catalog_ogen;    /* recovery catalog inode generation */
 331        __u8  lsd_peeruuid[40];    /* UUID of MDS associated with this OST */
 332        __u32 lsd_osd_index;       /* index number of OST in LOV */
 333        __u32 lsd_padding1;     /* was lsd_mdt_index, unused in 2.4.0 */
 334        __u32 lsd_start_epoch;     /* VBR: start epoch from last boot */
 335        /** transaction values since lsd_trans_table_time */
 336        __u64 lsd_trans_table[LR_EXPIRE_INTERVALS];
 337        /** start point of transno table below */
 338        __u32 lsd_trans_table_time; /* time of first slot in table above */
 339        __u32 lsd_expire_intervals; /* LR_EXPIRE_INTERVALS */
 340        __u8  lsd_padding[LR_SERVER_SIZE - 288];
 341};
 342
 343/* Data stored per client in the last_rcvd file.  In le32 order. */
 344struct lsd_client_data {
 345        __u8  lcd_uuid[40];      /* client UUID */
 346        __u64 lcd_last_transno; /* last completed transaction ID */
 347        __u64 lcd_last_xid;     /* xid for the last transaction */
 348        __u32 lcd_last_result;  /* result from last RPC */
 349        __u32 lcd_last_data;    /* per-op data (disposition for open &c.) */
 350        /* for MDS_CLOSE requests */
 351        __u64 lcd_last_close_transno; /* last completed transaction ID */
 352        __u64 lcd_last_close_xid;     /* xid for the last transaction */
 353        __u32 lcd_last_close_result;  /* result from last RPC */
 354        __u32 lcd_last_close_data;    /* per-op data */
 355        /* VBR: last versions */
 356        __u64 lcd_pre_versions[4];
 357        __u32 lcd_last_epoch;
 358        /** orphans handling for delayed export rely on that */
 359        __u32 lcd_first_epoch;
 360        __u8  lcd_padding[LR_CLIENT_SIZE - 128];
 361};
 362
 363/* bug20354: the lcd_uuid for export of clients may be wrong */
 364static inline void check_lcd(char *obd_name, int index,
 365                             struct lsd_client_data *lcd)
 366{
 367        int length = sizeof(lcd->lcd_uuid);
 368        if (strnlen((char*)lcd->lcd_uuid, length) == length) {
 369                lcd->lcd_uuid[length - 1] = '\0';
 370
 371                LCONSOLE_ERROR("the client UUID (%s) on %s for exports stored in last_rcvd(index = %d) is bad!\n",
 372                               lcd->lcd_uuid, obd_name, index);
 373        }
 374}
 375
 376/* last_rcvd handling */
 377static inline void lsd_le_to_cpu(struct lr_server_data *buf,
 378                                 struct lr_server_data *lsd)
 379{
 380        int i;
 381        memcpy(lsd->lsd_uuid, buf->lsd_uuid, sizeof(lsd->lsd_uuid));
 382        lsd->lsd_last_transno     = le64_to_cpu(buf->lsd_last_transno);
 383        lsd->lsd_compat14        = le64_to_cpu(buf->lsd_compat14);
 384        lsd->lsd_mount_count      = le64_to_cpu(buf->lsd_mount_count);
 385        lsd->lsd_feature_compat   = le32_to_cpu(buf->lsd_feature_compat);
 386        lsd->lsd_feature_rocompat = le32_to_cpu(buf->lsd_feature_rocompat);
 387        lsd->lsd_feature_incompat = le32_to_cpu(buf->lsd_feature_incompat);
 388        lsd->lsd_server_size      = le32_to_cpu(buf->lsd_server_size);
 389        lsd->lsd_client_start     = le32_to_cpu(buf->lsd_client_start);
 390        lsd->lsd_client_size      = le16_to_cpu(buf->lsd_client_size);
 391        lsd->lsd_subdir_count     = le16_to_cpu(buf->lsd_subdir_count);
 392        lsd->lsd_catalog_oid      = le64_to_cpu(buf->lsd_catalog_oid);
 393        lsd->lsd_catalog_ogen     = le32_to_cpu(buf->lsd_catalog_ogen);
 394        memcpy(lsd->lsd_peeruuid, buf->lsd_peeruuid, sizeof(lsd->lsd_peeruuid));
 395        lsd->lsd_osd_index      = le32_to_cpu(buf->lsd_osd_index);
 396        lsd->lsd_padding1       = le32_to_cpu(buf->lsd_padding1);
 397        lsd->lsd_start_epoch      = le32_to_cpu(buf->lsd_start_epoch);
 398        for (i = 0; i < LR_EXPIRE_INTERVALS; i++)
 399                lsd->lsd_trans_table[i] = le64_to_cpu(buf->lsd_trans_table[i]);
 400        lsd->lsd_trans_table_time = le32_to_cpu(buf->lsd_trans_table_time);
 401        lsd->lsd_expire_intervals = le32_to_cpu(buf->lsd_expire_intervals);
 402}
 403
 404static inline void lsd_cpu_to_le(struct lr_server_data *lsd,
 405                                 struct lr_server_data *buf)
 406{
 407        int i;
 408        memcpy(buf->lsd_uuid, lsd->lsd_uuid, sizeof(buf->lsd_uuid));
 409        buf->lsd_last_transno     = cpu_to_le64(lsd->lsd_last_transno);
 410        buf->lsd_compat14        = cpu_to_le64(lsd->lsd_compat14);
 411        buf->lsd_mount_count      = cpu_to_le64(lsd->lsd_mount_count);
 412        buf->lsd_feature_compat   = cpu_to_le32(lsd->lsd_feature_compat);
 413        buf->lsd_feature_rocompat = cpu_to_le32(lsd->lsd_feature_rocompat);
 414        buf->lsd_feature_incompat = cpu_to_le32(lsd->lsd_feature_incompat);
 415        buf->lsd_server_size      = cpu_to_le32(lsd->lsd_server_size);
 416        buf->lsd_client_start     = cpu_to_le32(lsd->lsd_client_start);
 417        buf->lsd_client_size      = cpu_to_le16(lsd->lsd_client_size);
 418        buf->lsd_subdir_count     = cpu_to_le16(lsd->lsd_subdir_count);
 419        buf->lsd_catalog_oid      = cpu_to_le64(lsd->lsd_catalog_oid);
 420        buf->lsd_catalog_ogen     = cpu_to_le32(lsd->lsd_catalog_ogen);
 421        memcpy(buf->lsd_peeruuid, lsd->lsd_peeruuid, sizeof(buf->lsd_peeruuid));
 422        buf->lsd_osd_index        = cpu_to_le32(lsd->lsd_osd_index);
 423        buf->lsd_padding1         = cpu_to_le32(lsd->lsd_padding1);
 424        buf->lsd_start_epoch      = cpu_to_le32(lsd->lsd_start_epoch);
 425        for (i = 0; i < LR_EXPIRE_INTERVALS; i++)
 426                buf->lsd_trans_table[i] = cpu_to_le64(lsd->lsd_trans_table[i]);
 427        buf->lsd_trans_table_time = cpu_to_le32(lsd->lsd_trans_table_time);
 428        buf->lsd_expire_intervals = cpu_to_le32(lsd->lsd_expire_intervals);
 429}
 430
 431static inline void lcd_le_to_cpu(struct lsd_client_data *buf,
 432                                 struct lsd_client_data *lcd)
 433{
 434        memcpy(lcd->lcd_uuid, buf->lcd_uuid, sizeof (lcd->lcd_uuid));
 435        lcd->lcd_last_transno       = le64_to_cpu(buf->lcd_last_transno);
 436        lcd->lcd_last_xid          = le64_to_cpu(buf->lcd_last_xid);
 437        lcd->lcd_last_result    = le32_to_cpu(buf->lcd_last_result);
 438        lcd->lcd_last_data        = le32_to_cpu(buf->lcd_last_data);
 439        lcd->lcd_last_close_transno = le64_to_cpu(buf->lcd_last_close_transno);
 440        lcd->lcd_last_close_xid     = le64_to_cpu(buf->lcd_last_close_xid);
 441        lcd->lcd_last_close_result  = le32_to_cpu(buf->lcd_last_close_result);
 442        lcd->lcd_last_close_data    = le32_to_cpu(buf->lcd_last_close_data);
 443        lcd->lcd_pre_versions[0]    = le64_to_cpu(buf->lcd_pre_versions[0]);
 444        lcd->lcd_pre_versions[1]    = le64_to_cpu(buf->lcd_pre_versions[1]);
 445        lcd->lcd_pre_versions[2]    = le64_to_cpu(buf->lcd_pre_versions[2]);
 446        lcd->lcd_pre_versions[3]    = le64_to_cpu(buf->lcd_pre_versions[3]);
 447        lcd->lcd_last_epoch      = le32_to_cpu(buf->lcd_last_epoch);
 448        lcd->lcd_first_epoch    = le32_to_cpu(buf->lcd_first_epoch);
 449}
 450
 451static inline void lcd_cpu_to_le(struct lsd_client_data *lcd,
 452                                 struct lsd_client_data *buf)
 453{
 454        memcpy(buf->lcd_uuid, lcd->lcd_uuid, sizeof (lcd->lcd_uuid));
 455        buf->lcd_last_transno       = cpu_to_le64(lcd->lcd_last_transno);
 456        buf->lcd_last_xid          = cpu_to_le64(lcd->lcd_last_xid);
 457        buf->lcd_last_result    = cpu_to_le32(lcd->lcd_last_result);
 458        buf->lcd_last_data        = cpu_to_le32(lcd->lcd_last_data);
 459        buf->lcd_last_close_transno = cpu_to_le64(lcd->lcd_last_close_transno);
 460        buf->lcd_last_close_xid     = cpu_to_le64(lcd->lcd_last_close_xid);
 461        buf->lcd_last_close_result  = cpu_to_le32(lcd->lcd_last_close_result);
 462        buf->lcd_last_close_data    = cpu_to_le32(lcd->lcd_last_close_data);
 463        buf->lcd_pre_versions[0]    = cpu_to_le64(lcd->lcd_pre_versions[0]);
 464        buf->lcd_pre_versions[1]    = cpu_to_le64(lcd->lcd_pre_versions[1]);
 465        buf->lcd_pre_versions[2]    = cpu_to_le64(lcd->lcd_pre_versions[2]);
 466        buf->lcd_pre_versions[3]    = cpu_to_le64(lcd->lcd_pre_versions[3]);
 467        buf->lcd_last_epoch      = cpu_to_le32(lcd->lcd_last_epoch);
 468        buf->lcd_first_epoch    = cpu_to_le32(lcd->lcd_first_epoch);
 469}
 470
 471static inline __u64 lcd_last_transno(struct lsd_client_data *lcd)
 472{
 473        return (lcd->lcd_last_transno > lcd->lcd_last_close_transno ?
 474                lcd->lcd_last_transno : lcd->lcd_last_close_transno);
 475}
 476
 477static inline __u64 lcd_last_xid(struct lsd_client_data *lcd)
 478{
 479        return (lcd->lcd_last_xid > lcd->lcd_last_close_xid ?
 480                lcd->lcd_last_xid : lcd->lcd_last_close_xid);
 481}
 482
 483/****************** superblock additional info *********************/
 484
 485struct ll_sb_info;
 486
 487struct lustre_sb_info {
 488        int                    lsi_flags;
 489        struct obd_device       *lsi_mgc;     /* mgc obd */
 490        struct lustre_mount_data *lsi_lmd;     /* mount command info */
 491        struct ll_sb_info       *lsi_llsbi;   /* add'l client sbi info */
 492        struct dt_device         *lsi_dt_dev;  /* dt device to access disk fs*/
 493        struct vfsmount   *lsi_srv_mnt; /* the one server mount */
 494        atomic_t              lsi_mounts;  /* references to the srv_mnt */
 495        char                      lsi_svname[MTI_NAME_MAXLEN];
 496        char                      lsi_osd_obdname[64];
 497        char                      lsi_osd_uuid[64];
 498        struct obd_export        *lsi_osd_exp;
 499        char                      lsi_osd_type[16];
 500        char                      lsi_fstype[16];
 501        struct backing_dev_info   lsi_bdi;     /* each client mountpoint needs
 502                                                  own backing_dev_info */
 503};
 504
 505#define LSI_UMOUNT_FAILOVER           0x00200000
 506#define LSI_BDI_INITIALIZED           0x00400000
 507
 508#define     s2lsi(sb)   ((struct lustre_sb_info *)((sb)->s_fs_info))
 509#define     s2lsi_nocast(sb) ((sb)->s_fs_info)
 510
 511#define     get_profile_name(sb)   (s2lsi(sb)->lsi_lmd->lmd_profile)
 512#define     get_mount_flags(sb)    (s2lsi(sb)->lsi_lmd->lmd_flags)
 513#define     get_mntdev_name(sb)    (s2lsi(sb)->lsi_lmd->lmd_dev)
 514
 515
 516/****************** mount lookup info *********************/
 517
 518struct lustre_mount_info {
 519        char             *lmi_name;
 520        struct super_block   *lmi_sb;
 521        struct vfsmount      *lmi_mnt;
 522        struct list_head            lmi_list_chain;
 523};
 524
 525/****************** prototypes *********************/
 526
 527/* obd_mount.c */
 528int server_name2fsname(const char *svname, char *fsname, const char **endptr);
 529int server_name2index(const char *svname, __u32 *idx, const char **endptr);
 530int server_name2svname(const char *label, char *svname, const char **endptr,
 531                       size_t svsize);
 532
 533int lustre_put_lsi(struct super_block *sb);
 534int lustre_start_simple(char *obdname, char *type, char *uuid,
 535                        char *s1, char *s2, char *s3, char *s4);
 536int lustre_start_mgc(struct super_block *sb);
 537void lustre_register_client_fill_super(int (*cfs)(struct super_block *sb,
 538                                                  struct vfsmount *mnt));
 539void lustre_register_kill_super_cb(void (*cfs)(struct super_block *sb));
 540int lustre_common_put_super(struct super_block *sb);
 541
 542
 543int mgc_fsname2resid(char *fsname, struct ldlm_res_id *res_id, int type);
 544
 545/** @} disk */
 546
 547#endif /* _LUSTRE_DISK_H */
 548