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LU-2139 osc: Track and limit "unstable" pages
[fs/lustre-release.git] / lustre / include / obd.h
index 7941a83..bf14b7d 100644 (file)
@@ -27,7 +27,7 @@
  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  *
- * Copyright (c) 2011, 2012, Intel Corporation.
+ * Copyright (c) 2011, 2013, Intel Corporation.
  */
 /*
  * This file is part of Lustre, http://www.lustre.org/
 #define IOC_MDC_MAX_NR       50
 
 #include <lustre/lustre_idl.h>
+#include <lustre_lib.h>
+#include <libcfs/bitmap.h>
 #ifdef HAVE_SERVER_SUPPORT
 # include <lu_target.h>
+# include <obd_target.h>
 #endif
 #include <lu_ref.h>
-#include <lustre_lib.h>
 #include <lustre_export.h>
+#include <lustre_fid.h>
 #include <lustre_fld.h>
 #include <lustre_capa.h>
 
-#include <libcfs/bitmap.h>
-
-
 #define MAX_OBD_DEVICES 8192
 
 struct osc_async_rc {
@@ -78,17 +78,15 @@ struct osc_async_rc {
 };
 
 struct lov_oinfo {                 /* per-stripe data structure */
-        struct ost_id   loi_oi;    /* object ID/Sequence on the target OST */
-        int loi_ost_idx;           /* OST stripe index in lov_tgt_desc->tgts */
-        int loi_ost_gen;           /* generation of this loi_ost_idx */
-
-        unsigned long loi_kms_valid:1;
-        __u64 loi_kms;             /* known minimum size */
-        struct ost_lvb loi_lvb;
-        struct osc_async_rc     loi_ar;
+       struct ost_id   loi_oi;    /* object ID/Sequence on the target OST */
+       int loi_ost_idx;           /* OST stripe index in lov_tgt_desc->tgts */
+       int loi_ost_gen;           /* generation of this loi_ost_idx */
+
+       unsigned long loi_kms_valid:1;
+       __u64 loi_kms;             /* known minimum size */
+       struct ost_lvb loi_lvb;
+       struct osc_async_rc     loi_ar;
 };
-#define loi_id  loi_oi.oi_id
-#define loi_seq loi_oi.oi_seq
 
 static inline void loi_kms_set(struct lov_oinfo *oinfo, __u64 kms)
 {
@@ -110,8 +108,7 @@ struct lov_stripe_md {
         __u64            lsm_maxbytes;
         struct {
                 /* Public members. */
-                __u64 lw_object_id;        /* lov object id */
-                __u64 lw_object_seq;       /* lov object seq */
+               struct ost_id lw_object_oi; /* lov object id/seq */
 
                 /* LOV-private members start here -- only for use in lov/. */
                 __u32 lw_magic;
@@ -125,8 +122,7 @@ struct lov_stripe_md {
         struct lov_oinfo *lsm_oinfo[0];
 };
 
-#define lsm_object_id    lsm_wire.lw_object_id
-#define lsm_object_seq   lsm_wire.lw_object_seq
+#define lsm_oi          lsm_wire.lw_object_oi
 #define lsm_magic        lsm_wire.lw_magic
 #define lsm_layout_gen   lsm_wire.lw_layout_gen
 #define lsm_stripe_size  lsm_wire.lw_stripe_size
@@ -134,6 +130,20 @@ struct lov_stripe_md {
 #define lsm_stripe_count lsm_wire.lw_stripe_count
 #define lsm_pool_name    lsm_wire.lw_pool_name
 
+static inline bool lsm_is_released(struct lov_stripe_md *lsm)
+{
+       return !!(lsm->lsm_pattern & LOV_PATTERN_F_RELEASED);
+}
+
+static inline bool lsm_has_objects(struct lov_stripe_md *lsm)
+{
+       if (lsm == NULL)
+               return false;
+       if (lsm_is_released(lsm))
+               return false;
+       return true;
+}
+
 struct obd_info;
 
 typedef int (*obd_enqueue_update_f)(void *cookie, int rc);
@@ -205,32 +215,32 @@ static inline int lov_lum_lsm_cmp(struct lov_user_md *lum,
 }
 
 static inline int lov_lum_swab_if_needed(struct lov_user_md_v3 *lumv3,
-                                         int *lmm_magic,
-                                         struct lov_user_md *lum)
+                                        int *lmm_magic,
+                                        struct lov_user_md *lum)
 {
-        if (lum && cfs_copy_from_user(lumv3, lum,sizeof(struct lov_user_md_v1)))
-                return -EFAULT;
-
-        *lmm_magic = lumv3->lmm_magic;
-
-        if (*lmm_magic == __swab32(LOV_USER_MAGIC_V1)) {
-                lustre_swab_lov_user_md_v1((struct lov_user_md_v1 *)lumv3);
-                *lmm_magic = LOV_USER_MAGIC_V1;
-        } else if (*lmm_magic == LOV_USER_MAGIC_V3) {
-                if (lum && cfs_copy_from_user(lumv3, lum, sizeof(*lumv3)))
-                        return -EFAULT;
-        } else if (*lmm_magic == __swab32(LOV_USER_MAGIC_V3)) {
-                if (lum && cfs_copy_from_user(lumv3, lum, sizeof(*lumv3)))
-                        return -EFAULT;
-                lustre_swab_lov_user_md_v3(lumv3);
-                *lmm_magic = LOV_USER_MAGIC_V3;
-        } else if (*lmm_magic != LOV_USER_MAGIC_V1) {
-                CDEBUG(D_IOCTL,
-                       "bad userland LOV MAGIC: %#08x != %#08x nor %#08x\n",
-                       *lmm_magic, LOV_USER_MAGIC_V1, LOV_USER_MAGIC_V3);
-                       return -EINVAL;
-        }
-        return 0;
+       if (lum && copy_from_user(lumv3, lum, sizeof(struct lov_user_md_v1)))
+               return -EFAULT;
+
+       *lmm_magic = lumv3->lmm_magic;
+
+       if (*lmm_magic == __swab32(LOV_USER_MAGIC_V1)) {
+               lustre_swab_lov_user_md_v1((struct lov_user_md_v1 *)lumv3);
+               *lmm_magic = LOV_USER_MAGIC_V1;
+       } else if (*lmm_magic == LOV_USER_MAGIC_V3) {
+               if (lum && copy_from_user(lumv3, lum, sizeof(*lumv3)))
+                       return -EFAULT;
+       } else if (*lmm_magic == __swab32(LOV_USER_MAGIC_V3)) {
+               if (lum && copy_from_user(lumv3, lum, sizeof(*lumv3)))
+                       return -EFAULT;
+               lustre_swab_lov_user_md_v3(lumv3);
+               *lmm_magic = LOV_USER_MAGIC_V3;
+       } else if (*lmm_magic != LOV_USER_MAGIC_V1) {
+               CDEBUG(D_IOCTL,
+                      "bad userland LOV MAGIC: %#08x != %#08x nor %#08x\n",
+                      *lmm_magic, LOV_USER_MAGIC_V1, LOV_USER_MAGIC_V3);
+                      return -EINVAL;
+       }
+       return 0;
 }
 
 void lov_stripe_lock(struct lov_stripe_md *md);
@@ -248,149 +258,31 @@ struct obd_type {
 };
 
 struct brw_page {
-        obd_off  off;
-        cfs_page_t *pg;
-        int count;
-        obd_flag flag;
-};
-
-/* Individual type definitions */
-
-struct ost_server_data;
-
-struct osd_properties {
-        size_t osd_max_ea_size;
-};
-
-#define OBT_MAGIC       0xBDDECEAE
-/* hold common fields for "target" device */
-struct obd_device_target {
-        __u32                     obt_magic;
-        __u32                     obt_instance;
-        struct super_block       *obt_sb;
-        /** last_rcvd file */
-        struct file              *obt_rcvd_filp;
-#ifdef HAVE_SERVER_SUPPORT
-        struct lu_target         *obt_lut;
-#endif
-        __u64                     obt_mount_count;
-       struct rw_semaphore       obt_rwsem;
-        struct vfsmount          *obt_vfsmnt;
-        struct file              *obt_health_check_filp;
-       struct osd_properties     obt_osd_properties;
-       struct obd_job_stats      obt_jobstats;
+       obd_off  off;
+       struct page *pg;
+       int count;
+       obd_flag flag;
 };
 
 /* llog contexts */
 enum llog_ctxt_id {
-        LLOG_CONFIG_ORIG_CTXT  =  0,
-        LLOG_CONFIG_REPL_CTXT,
-        LLOG_MDS_OST_ORIG_CTXT,
-        LLOG_MDS_OST_REPL_CTXT,
-        LLOG_SIZE_ORIG_CTXT,
-        LLOG_SIZE_REPL_CTXT,
-        LLOG_RD1_ORIG_CTXT,
-        LLOG_RD1_REPL_CTXT,
-        LLOG_TEST_ORIG_CTXT,
-        LLOG_TEST_REPL_CTXT,
-        LLOG_LOVEA_ORIG_CTXT,
-        LLOG_LOVEA_REPL_CTXT,
-        LLOG_CHANGELOG_ORIG_CTXT,      /**< changelog generation on mdd */
-        LLOG_CHANGELOG_REPL_CTXT,      /**< changelog access on clients */
-        LLOG_CHANGELOG_USER_ORIG_CTXT, /**< for multiple changelog consumers */
-        LLOG_MAX_CTXTS
-};
-
-#define FILTER_SUBDIR_COUNT      32            /* set to zero for no subdirs */
-
-struct filter_subdirs {
-       cfs_dentry_t *dentry[FILTER_SUBDIR_COUNT];
-};
-
-
-struct filter_ext {
-        __u64                fe_start;
-        __u64                fe_end;
-};
-
-struct filter_obd {
-        /* NB this field MUST be first */
-        struct obd_device_target fo_obt;
-        const char          *fo_fstype;
-
-        int                  fo_group_count;
-        cfs_dentry_t        *fo_dentry_O;
-        cfs_dentry_t       **fo_dentry_O_groups;
-        struct filter_subdirs   *fo_dentry_O_sub;
-       struct mutex            fo_init_lock;   /* group initialization lock*/
-       int                     fo_committed_group;
-
-       spinlock_t              fo_objidlock;   /* protect fo_lastobjid */
-
-       unsigned long           fo_destroys_in_progress;
-       struct mutex            fo_create_locks[FILTER_SUBDIR_COUNT];
-
-        cfs_list_t fo_export_list;
-        int                  fo_subdir_count;
-
-        obd_size             fo_tot_dirty;      /* protected by obd_osfs_lock */
-        obd_size             fo_tot_granted;    /* all values in bytes */
-        obd_size             fo_tot_pending;
-        int                  fo_tot_granted_clients;
-
-        obd_size             fo_readcache_max_filesize;
-       spinlock_t              fo_flags_lock;
-        unsigned int         fo_read_cache:1,   /**< enable read-only cache */
-                             fo_writethrough_cache:1,/**< read cache writes */
-                             fo_mds_ost_sync:1, /**< MDS-OST orphan recovery*/
-                             fo_raid_degraded:1;/**< RAID device degraded */
-
-        struct obd_import   *fo_mdc_imp;
-        struct obd_uuid      fo_mdc_uuid;
-        struct lustre_handle fo_mdc_conn;
-        struct file        **fo_last_objid_files;
-        __u64               *fo_last_objids; /* last created objid for groups,
-                                              * protected by fo_objidlock */
-
-       struct mutex            fo_alloc_lock;
-
-        cfs_atomic_t         fo_r_in_flight;
-        cfs_atomic_t         fo_w_in_flight;
-
-       /*
-        * per-filter pool of kiobuf's allocated by filter_common_setup() and
-        * torn down by filter_cleanup().
-        *
-        * This pool contains kiobuf used by
-        * filter_{prep,commit}rw_{read,write}() and is shared by all OST
-        * threads.
-        *
-        * Locking: protected by internal lock of cfs_hash, pool can be
-        * found from this hash table by t_id of ptlrpc_thread.
-        */
-       struct cfs_hash         *fo_iobuf_hash;
-
-       cfs_list_t              fo_llog_list;
-       spinlock_t              fo_llog_list_lock;
-
-        struct brw_stats         fo_filter_stats;
-
-        int                      fo_fmd_max_num; /* per exp filter_mod_data */
-        int                      fo_fmd_max_age; /* jiffies to fmd expiry */
-        unsigned long            fo_syncjournal:1, /* sync journal on writes */
-                                 fo_sync_lock_cancel:2;/* sync on lock cancel */
-
-
-        /* sptlrpc stuff */
-       rwlock_t                fo_sptlrpc_lock;
-        struct sptlrpc_rule_set  fo_sptlrpc_rset;
-
-        /* capability related */
-        unsigned int             fo_fl_oss_capa;
-        cfs_list_t               fo_capa_keys;
-        cfs_hlist_head_t        *fo_capa_hash;
-        struct llog_commit_master *fo_lcm;
-        int                      fo_sec_level;
+       LLOG_CONFIG_ORIG_CTXT  =  0,
+       LLOG_CONFIG_REPL_CTXT,
+       LLOG_MDS_OST_ORIG_CTXT,
+       LLOG_MDS_OST_REPL_CTXT,
+       LLOG_SIZE_ORIG_CTXT,
+       LLOG_SIZE_REPL_CTXT,
+       LLOG_RD1_ORIG_CTXT,
+       LLOG_RD1_REPL_CTXT,
+       LLOG_TEST_ORIG_CTXT,
+       LLOG_TEST_REPL_CTXT,
+       LLOG_LOVEA_ORIG_CTXT,
+       LLOG_LOVEA_REPL_CTXT,
+       LLOG_CHANGELOG_ORIG_CTXT,       /**< changelog generation on mdd */
+       LLOG_CHANGELOG_REPL_CTXT,       /**< changelog access on clients */
+       LLOG_CHANGELOG_USER_ORIG_CTXT,  /**< for multiple changelog consumers */
+       LLOG_AGENT_ORIG_CTXT,           /**< agent requests generation on cdt */
+       LLOG_MAX_CTXTS
 };
 
 struct timeout_item {
@@ -437,9 +329,6 @@ struct client_obd {
         enum lustre_sec_part     cl_sp_to;
         struct sptlrpc_flavor    cl_flvr_mgc;   /* fixed flavor of mgc->mgs */
 
-        //struct llog_canceld_ctxt *cl_llcd; /* it's included by obd_llog_ctxt */
-        void                    *cl_llcd_offset;
-
         /* the grant values are protected by loi_list_lock below */
         long                     cl_dirty;         /* all _dirty_ in bytes */
         long                     cl_dirty_max;     /* allowed w/o rpc */
@@ -458,7 +347,7 @@ struct client_obd {
        int                  cl_grant_shrink_interval; /* seconds */
 
        /* A chunk is an optimal size used by osc_extent to determine
-        * the extent size. A chunk is max(CFS_PAGE_SIZE, OST block size) */
+        * the extent size. A chunk is max(PAGE_CACHE_SIZE, OST block size) */
        int                  cl_chunkbits;
        int                  cl_chunk;
        int                  cl_extent_tax; /* extent overhead, by bytes */
@@ -494,7 +383,7 @@ struct client_obd {
         /* just a sum of the loi/lop pending numbers to be exported by /proc */
        cfs_atomic_t             cl_pending_w_pages;
        cfs_atomic_t             cl_pending_r_pages;
-       int                      cl_max_pages_per_rpc;
+       __u32                    cl_max_pages_per_rpc;
         int                      cl_max_rpcs_in_flight;
         struct obd_histogram     cl_read_rpc_hist;
         struct obd_histogram     cl_write_rpc_hist;
@@ -515,15 +404,15 @@ struct client_obd {
 
         /* number of in flight destroy rpcs is limited to max_rpcs_in_flight */
         cfs_atomic_t             cl_destroy_in_flight;
-        cfs_waitq_t              cl_destroy_waitq;
+       wait_queue_head_t        cl_destroy_waitq;
 
         struct mdc_rpc_lock     *cl_rpc_lock;
         struct mdc_rpc_lock     *cl_close_lock;
 
         /* mgc datastruct */
        struct semaphore         cl_mgc_sem;
-        struct vfsmount         *cl_mgc_vfsmnt;
-        struct dentry           *cl_mgc_configs_dir;
+       struct local_oid_storage *cl_mgc_los;
+       struct dt_object        *cl_mgc_configs_dir;
         cfs_atomic_t             cl_mgc_refcount;
         struct obd_export       *cl_mgc_mgsexp;
 
@@ -561,25 +450,6 @@ struct obd_id_info {
         obd_id  *data;
 };
 
-/* */
-
-struct echo_obd {
-       struct obd_device_target eo_obt;
-       struct obdo             eo_oa;
-       spinlock_t               eo_lock;
-       __u64                    eo_lastino;
-       struct lustre_handle    eo_nl_lock;
-       cfs_atomic_t            eo_prep;
-};
-
-struct ost_obd {
-       struct ptlrpc_service   *ost_service;
-       struct ptlrpc_service   *ost_create_service;
-       struct ptlrpc_service   *ost_io_service;
-       struct ptlrpc_service   *ost_seq_service;
-       struct mutex            ost_health_mutex;
-};
-
 struct echo_client_obd {
        struct obd_export       *ec_exp;   /* the local connection to osc/lov */
        spinlock_t              ec_lock;
@@ -647,10 +517,10 @@ struct lov_qos {
                             lq_reset:1,     /* zero current penalties */
                             lq_statfs_in_progress:1; /* statfs op in
                                                         progress */
-        /* qos statfs data */
-        struct lov_statfs_data *lq_statfs_data;
-        cfs_waitq_t         lq_statfs_waitq; /* waitqueue to notify statfs
-                                              * requests completion */
+       /* qos statfs data */
+       struct lov_statfs_data *lq_statfs_data;
+       wait_queue_head_t   lq_statfs_waitq; /* waitqueue to notify statfs
+                                             * requests completion */
 };
 
 struct lov_tgt_desc {
@@ -703,16 +573,18 @@ struct lov_obd {
         cfs_proc_dir_entry_t   *lov_pool_proc_entry;
         enum lustre_sec_part    lov_sp_me;
 
-       /* Cached LRU pages from upper layer */
+       /* Cached LRU and unstable data from upper layer */
        void                   *lov_cache;
+
+       struct rw_semaphore     lov_notify_lock;
 };
 
 struct lmv_tgt_desc {
-        struct obd_uuid         ltd_uuid;
-        struct obd_export      *ltd_exp;
-        int                     ltd_active; /* is this target up for requests */
-        int                     ltd_idx;
+       struct obd_uuid         ltd_uuid;
+       struct obd_export       *ltd_exp;
+       int                     ltd_idx;
        struct mutex            ltd_fid_mutex;
+       unsigned long           ltd_active:1; /* target up for requests */
 };
 
 enum placement_policy {
@@ -728,51 +600,47 @@ struct lmv_obd {
        int                     refcount;
        struct lu_client_fld    lmv_fld;
        spinlock_t              lmv_lock;
-        placement_policy_t      lmv_placement;
-        struct lmv_desc         desc;
-        struct obd_uuid         cluuid;
-        struct obd_export       *exp;
-
-        int                     connected;
-        int                     max_easize;
-        int                     max_def_easize;
-        int                     max_cookiesize;
-        int                     server_timeout;
-       struct mutex            init_mutex;
+       placement_policy_t      lmv_placement;
+       struct lmv_desc         desc;
+       struct obd_uuid         cluuid;
+       struct obd_export       *exp;
 
-        struct lmv_tgt_desc     *tgts;
-        int                     tgts_size;
+       struct mutex            init_mutex;
+       int                     connected;
+       int                     max_easize;
+       int                     max_def_easize;
+       int                     max_cookiesize;
+       int                     server_timeout;
 
-        struct obd_connect_data *datas;
-        int                     datas_size;
+       int                     tgts_size; /* size of tgts array */
+       struct lmv_tgt_desc     **tgts;
 
-        struct obd_connect_data conn_data;
+       struct obd_connect_data conn_data;
 };
 
 struct niobuf_local {
-       __u64 lnb_file_offset;
-       __u32 lnb_page_offset;
-        __u32 len;
-        __u32 flags;
-        cfs_page_t    *page;
-        cfs_dentry_t  *dentry;
-        int lnb_grant_used;
-        int rc;
+       __u64           lnb_file_offset;
+       __u32           lnb_page_offset;
+       __u32           len;
+       __u32           flags;
+       struct page     *page;
+       struct dentry   *dentry;
+       int             lnb_grant_used;
+       int             rc;
 };
 
 #define LUSTRE_FLD_NAME         "fld"
 #define LUSTRE_SEQ_NAME         "seq"
 
-#define LUSTRE_CMM_NAME         "cmm"
 #define LUSTRE_MDD_NAME         "mdd"
 #define LUSTRE_OSD_LDISKFS_NAME        "osd-ldiskfs"
 #define LUSTRE_OSD_ZFS_NAME     "osd-zfs"
 #define LUSTRE_VVP_NAME         "vvp"
 #define LUSTRE_LMV_NAME         "lmv"
-#define LUSTRE_CMM_MDC_NAME     "cmm-mdc"
 #define LUSTRE_SLP_NAME         "slp"
 #define LUSTRE_LOD_NAME                "lod"
 #define LUSTRE_OSP_NAME                "osp"
+#define LUSTRE_LWP_NAME                "lwp"
 
 /* obd device type names */
  /* FIXME all the references to LUSTRE_MDS_NAME should be swapped with LUSTRE_MDT_NAME */
@@ -786,7 +654,6 @@ struct niobuf_local {
 #define LUSTRE_MGS_NAME         "mgs"
 #define LUSTRE_MGC_NAME         "mgc"
 
-#define LUSTRE_CACHEOBD_NAME    "cobd"
 #define LUSTRE_ECHO_NAME        "obdecho"
 #define LUSTRE_ECHO_CLIENT_NAME "echo_client"
 #define LUSTRE_QMT_NAME         "qmt"
@@ -797,10 +664,7 @@ struct niobuf_local {
 #define LUSTRE_MGS_OBDNAME "MGS"
 #define LUSTRE_MGC_OBDNAME "MGC"
 
-/* Don't conflict with on-wire flags OBD_BRW_WRITE, etc */
-#define N_LOCAL_TEMP_PAGE 0x10000000
-
-static inline int is_osp_on_ost(char *name)
+static inline int is_osp_on_mdt(char *name)
 {
        char   *ptr;
 
@@ -810,23 +674,28 @@ static inline int is_osp_on_ost(char *name)
                return 0;
        }
 
-       if (strncmp(ptr + 1, "OST", 3) != 0 && strncmp(ptr + 1, "MDT", 3) != 0)
-               return 0;
+       /* 1.8 OSC/OSP name on MDT is fsname-OSTxxxx-osc */
+       if (strncmp(ptr + 1, "osc", 3) == 0)
+               return 1;
 
-       /* match the "-osp" */
-       if (ptr - name < strlen(LUSTRE_OSP_NAME) + 1)
+       if (strncmp(ptr + 1, "MDT", 3) != 0)
                return 0;
 
-       ptr -= (strlen(LUSTRE_OSP_NAME) + 1);
-       if (*ptr != '-')
+       while (*(--ptr) != '-' && ptr != name);
+
+       if (ptr == name)
                return 0;
 
-       if (strncmp(ptr + 1, LUSTRE_OSP_NAME, strlen(LUSTRE_OSP_NAME)) != 0)
+       if (strncmp(ptr + 1, LUSTRE_OSP_NAME, strlen(LUSTRE_OSP_NAME)) != 0 &&
+           strncmp(ptr + 1, LUSTRE_OSC_NAME, strlen(LUSTRE_OSC_NAME)) != 0)
                return 0;
 
        return 1;
 }
 
+/* Don't conflict with on-wire flags OBD_BRW_WRITE, etc */
+#define N_LOCAL_TEMP_PAGE 0x10000000
+
 struct obd_trans_info {
         __u64                    oti_transno;
         __u64                    oti_xid;
@@ -840,7 +709,7 @@ struct obd_trans_info {
         struct llog_cookie      *oti_logcookies;
         int                      oti_numcookies;
        /** synchronous write is needed */
-       long                     oti_sync_write:1;
+       unsigned long            oti_sync_write:1;
 
         /* initial thread handling transaction */
         struct ptlrpc_thread *   oti_thread;
@@ -959,45 +828,11 @@ struct target_recovery_data {
        struct completion       trd_finishing;
 };
 
-/**
-  * In HEAD for CMD, the object is created in group number which is 3>=
-  * or indexing starts from 3. To test this assertions are added to disallow
-  * group 0. But to run 2.0 mds server on 1.8.x disk format (i.e. interop_mode)
-  * object in group 0 needs to be allowed.
-  * So for interop mode following changes needs to be done:
-  * 1. No need to assert on group 0 or allow group 0
-  * 2. The group number indexing starts from 0 instead of 3
-  */
-
-#define LASSERT_SEQ_IS_MDT(seq) LASSERT(fid_seq_is_mdt(seq))
-
-static inline __u64 objseq_to_mdsno(obd_seq seq)
-{
-        LASSERT_SEQ_IS_MDT(seq);
-        if (seq == FID_SEQ_OST_MDT0)
-                return 0;
-        return seq - FID_SEQ_OST_MDT1 + 1;
-}
-
-static inline int mdt_to_obd_objseq(int mdtid)
-{
-        /**
-         * MDS0 uses seq 0 pre FID-on-OST, other MDSes will use seq from
-         * FID_SEQ_OST_MDT1
-         */
-        if (mdtid)
-                return FID_SEQ_OST_MDT1 + mdtid - 1;
-        return 0;
-}
-
 struct obd_llog_group {
-        cfs_list_t         olg_list;
-        int                olg_seq;
-        struct llog_ctxt  *olg_ctxts[LLOG_MAX_CTXTS];
-        cfs_waitq_t        olg_waitq;
+       int                olg_seq;
+       struct llog_ctxt   *olg_ctxts[LLOG_MAX_CTXTS];
+       wait_queue_head_t  olg_waitq;
        spinlock_t         olg_lock;
-       struct obd_export *olg_exp;
-       int                olg_initializing;
        struct mutex       olg_cat_processing;
 };
 
@@ -1006,35 +841,38 @@ struct obd_llog_group {
 #define OBD_DEV_BY_DEVNAME      0xffffd0de
 
 struct obd_device {
-        struct obd_type        *obd_type;
-        __u32                   obd_magic;
+       struct obd_type         *obd_type;
+       __u32                    obd_magic;
 
         /* common and UUID name of this device */
-        char                    obd_name[MAX_OBD_NAME];
-        struct obd_uuid         obd_uuid;
-
-        struct lu_device       *obd_lu_dev;
-
-        int                     obd_minor;
-        /* bitfield modification is protected by obd_dev_lock */
-        unsigned long obd_attached:1,      /* finished attach */
-                      obd_set_up:1,        /* finished setup */
-                      obd_recovering:1,    /* there are recoverable clients */
-                      obd_abort_recovery:1,/* recovery expired */
-                      obd_version_recov:1, /* obd uses version checking */
-                      obd_replayable:1,    /* recovery is enabled; inform clients */
-                      obd_no_transno:1,    /* no committed-transno notification */
-                      obd_no_recov:1,      /* fail instead of retry messages */
-                      obd_stopping:1,      /* started cleanup */
-                      obd_starting:1,      /* started setup */
-                      obd_force:1,         /* cleanup with > 0 obd refcount */
-                      obd_fail:1,          /* cleanup with failover */
-                      obd_async_recov:1,   /* allow asynchronous orphan cleanup */
-                      obd_no_conn:1,       /* deny new connections */
-                      obd_inactive:1,      /* device active/inactive
-                                           * (for /proc/status only!!) */
-                      obd_no_ir:1,         /* no imperative recovery. */
-                      obd_process_conf:1;  /* device is processing mgs config */
+       char                     obd_name[MAX_OBD_NAME];
+       struct obd_uuid          obd_uuid;
+       int                      obd_minor;
+       struct lu_device        *obd_lu_dev;
+
+       /* bitfield modification is protected by obd_dev_lock */
+       unsigned long
+               obd_attached:1,         /* finished attach */
+               obd_set_up:1,           /* finished setup */
+               obd_recovering:1,       /* there are recoverable clients */
+               obd_abort_recovery:1,   /* recovery expired */
+               obd_version_recov:1,    /* obd uses version checking */
+               obd_replayable:1,       /* recovery is enabled;
+                                        * inform clients */
+               obd_no_transno:1,       /* no committed-transno notification */
+               obd_no_recov:1,         /* fail instead of retry messages */
+               obd_stopping:1,         /* started cleanup */
+               obd_starting:1,         /* started setup */
+               obd_force:1,            /* cleanup with > 0 obd refcount */
+               obd_fail:1,             /* cleanup with failover */
+               obd_async_recov:1,      /* allow asynchronous orphan cleanup */
+               obd_no_conn:1,          /* deny new connections */
+               obd_inactive:1,         /* device active/inactive
+                                        * (for /proc/status only!!) */
+               obd_no_ir:1,            /* no imperative recovery. */
+               obd_process_conf:1,     /* device is processing mgs config */
+               obd_uses_nid_stats:1;   /* maintain per-client OBD stats */
+
         /* use separate field as it is set in interrupt to don't mess with
          * protection of other bits using _bh lock */
         unsigned long obd_recovery_expired:1;
@@ -1046,7 +884,6 @@ struct obd_device {
         cfs_hash_t             *obd_nid_stats_hash;
         cfs_list_t              obd_nid_stats;
         cfs_atomic_t            obd_refcount;
-        cfs_waitq_t             obd_refcount_waitq;
         cfs_list_t              obd_exports;
         cfs_list_t              obd_unlinked_exports;
         cfs_list_t              obd_delayed_exports;
@@ -1058,7 +895,6 @@ struct obd_device {
        spinlock_t              obd_dev_lock; /* protect OBD bitfield above */
        struct mutex            obd_dev_mutex;
        __u64                   obd_last_committed;
-       struct fsfilt_operations *obd_fsops;
        spinlock_t              obd_osfs_lock;
        struct obd_statfs       obd_osfs;       /* locked by obd_osfs_lock */
        __u64                   obd_osfs_age;
@@ -1080,16 +916,16 @@ struct obd_device {
          * obd_next_recovery_transno value */
        spinlock_t                       obd_recovery_task_lock;
         __u64                            obd_next_recovery_transno;
-        int                              obd_replayed_requests;
-        int                              obd_requests_queued_for_recovery;
-        cfs_waitq_t                      obd_next_transno_waitq;
-        /* protected by obd_recovery_task_lock */
-        cfs_timer_t                      obd_recovery_timer;
-        time_t                           obd_recovery_start; /* seconds */
-        time_t                           obd_recovery_end; /* seconds, for lprocfs_status */
-        int                              obd_recovery_time_hard;
-        int                              obd_recovery_timeout;
-        int                              obd_recovery_ir_factor;
+       int                              obd_replayed_requests;
+       int                              obd_requests_queued_for_recovery;
+       wait_queue_head_t                obd_next_transno_waitq;
+       /* protected by obd_recovery_task_lock */
+       struct timer_list                obd_recovery_timer;
+       time_t                           obd_recovery_start; /* seconds */
+       time_t                           obd_recovery_end; /* seconds, for lprocfs_status */
+       int                              obd_recovery_time_hard;
+       int                              obd_recovery_timeout;
+       int                              obd_recovery_ir_factor;
 
         /* new recovery stuff from CMD2 */
         struct target_recovery_data      obd_recovery_data;
@@ -1100,32 +936,33 @@ struct obd_device {
         cfs_list_t                       obd_req_replay_queue;
         cfs_list_t                       obd_lock_replay_queue;
         cfs_list_t                       obd_final_req_queue;
-        int                              obd_recovery_stage;
-
-        union {
-                struct obd_device_target obt;
-                struct filter_obd filter;
-                struct client_obd cli;
-                struct ost_obd ost;
-                struct echo_client_obd echo_client;
-                struct echo_obd echo;
-                struct lov_obd lov;
-                struct lmv_obd lmv;
-        } u;
-        /* Fields used by LProcFS */
-        unsigned int           obd_cntr_base;
-        struct lprocfs_stats  *obd_stats;
-
-        unsigned int           md_cntr_base;
-        struct lprocfs_stats  *md_stats;
+
+       union {
+#ifdef HAVE_SERVER_SUPPORT
+               struct obd_device_target obt;
+               struct filter_obd filter;
+               struct ost_obd ost;
+               struct echo_obd echo;
+#endif
+               struct client_obd cli;
+               struct echo_client_obd echo_client;
+               struct lov_obd lov;
+               struct lmv_obd lmv;
+       } u;
+       /* Fields used by LProcFS */
+       unsigned int           obd_cntr_base;
+       struct lprocfs_stats  *obd_stats;
+
+       unsigned int           obd_md_cntr_base;
+       struct lprocfs_stats  *obd_md_stats;
 
         cfs_proc_dir_entry_t  *obd_proc_entry;
         cfs_proc_dir_entry_t  *obd_proc_exports_entry;
         cfs_proc_dir_entry_t  *obd_svc_procroot;
         struct lprocfs_stats  *obd_svc_stats;
-        cfs_atomic_t           obd_evict_inprogress;
-        cfs_waitq_t            obd_evict_inprogress_waitq;
-        cfs_list_t             obd_evict_list; /* protected with pet_lock */
+       cfs_atomic_t           obd_evict_inprogress;
+       wait_queue_head_t      obd_evict_inprogress_waitq;
+       cfs_list_t             obd_evict_list; /* protected with pet_lock */
 
         /**
          * Ldlm pool part. Save last calculated SLV and Limit.
@@ -1172,6 +1009,7 @@ enum obd_cleanup_stage {
 #define KEY_INIT_RECOV          "initial_recov"
 #define KEY_INTERMDS            "inter_mds"
 #define KEY_LAST_ID             "last_id"
+#define KEY_LAST_FID           "last_fid"
 #define KEY_LOCK_TO_STRIPE      "lock_to_stripe"
 #define KEY_LOVDESC             "lovdesc"
 #define KEY_LOV_IDX             "lov_idx"
@@ -1190,6 +1028,7 @@ enum obd_cleanup_stage {
 
 #define KEY_CACHE_SET          "cache_set"
 #define KEY_CACHE_LRU_SHRINK   "cache_lru_shrink"
+#define KEY_CHANGELOG_INDEX    "changelog_index"
 
 struct lu_context;
 
@@ -1207,6 +1046,7 @@ struct lu_context;
 #define IT_LAYOUT   (1 << 10)
 #define IT_QUOTA_DQACQ (1 << 11)
 #define IT_QUOTA_CONN  (1 << 12)
+#define IT_SETXATTR (1 << 13)
 
 static inline int it_to_lock_mode(struct lookup_intent *it)
 {
@@ -1216,6 +1056,10 @@ static inline int it_to_lock_mode(struct lookup_intent *it)
         else if (it->it_op & (IT_READDIR | IT_GETATTR | IT_OPEN | IT_LOOKUP |
                               IT_LAYOUT))
                 return LCK_CR;
+       else if (it->it_op &  IT_GETXATTR)
+               return LCK_PR;
+       else if (it->it_op &  IT_SETXATTR)
+               return LCK_PW;
 
         LASSERTF(0, "Invalid it_op: %d\n", it->it_op);
         return -EINVAL;
@@ -1245,26 +1089,41 @@ struct md_op_data {
 #ifdef __KERNEL__
        unsigned int            op_attr_flags;
 #endif
-        __u64                   op_valid;
-        loff_t                  op_attr_blocks;
+       __u64                   op_valid;
+       loff_t                  op_attr_blocks;
+
+       /* Size-on-MDS epoch and flags. */
+       __u64                   op_ioepoch;
+       __u32                   op_flags;
+
+       /* Capa fields */
+       struct obd_capa        *op_capa1;
+       struct obd_capa        *op_capa2;
+
+       /* Various operation flags. */
+       enum mds_op_bias        op_bias;
+
+       /* Operation type */
+       __u32                   op_opc;
 
-        /* Size-on-MDS epoch and flags. */
-        __u64                   op_ioepoch;
-        __u32                   op_flags;
+       /* Used by readdir */
+       __u64                   op_offset;
 
-        /* Capa fields */
-        struct obd_capa        *op_capa1;
-        struct obd_capa        *op_capa2;
+       /* Used by readdir */
+       __u32                   op_npages;
 
-        /* Various operation flags. */
-        __u32                   op_bias;
+       /* used to transfer info between the stacks of MD client
+        * see enum op_cli_flags */
+       __u32                   op_cli_flags;
 
-        /* Operation type */
-        __u32                   op_opc;
+       /* File object data version for HSM release, on client */
+       __u64                   op_data_version;
+       struct lustre_handle    op_lease_handle;
+};
 
-        /* Used by readdir */
-        __u32                   op_npages;
-        __u64                   op_offset;
+enum op_cli_flags {
+       CLI_SET_MEA     = 1 << 0,
+       CLI_RM_ENTRY    = 1 << 1,
 };
 
 struct md_enqueue_info;
@@ -1273,12 +1132,6 @@ typedef int (* md_enqueue_cb_t)(struct ptlrpc_request *req,
                                 struct md_enqueue_info *minfo,
                                 int rc);
 
-/* seq client type */
-enum lu_cli_type {
-       LUSTRE_SEQ_METADATA = 1,
-       LUSTRE_SEQ_DATA
-};
-
 struct md_enqueue_info {
         struct md_op_data       mi_data;
         struct lookup_intent    mi_it;
@@ -1290,9 +1143,9 @@ struct md_enqueue_info {
 };
 
 struct obd_ops {
-        cfs_module_t *o_owner;
-        int (*o_iocontrol)(unsigned int cmd, struct obd_export *exp, int len,
-                           void *karg, void *uarg);
+       struct module *o_owner;
+       int (*o_iocontrol)(unsigned int cmd, struct obd_export *exp, int len,
+                          void *karg, void *uarg);
         int (*o_get_info)(const struct lu_env *env, struct obd_export *,
                           __u32 keylen, void *key, __u32 *vallen, void *val,
                           struct lov_stripe_md *lsm);
@@ -1327,9 +1180,10 @@ struct obd_ops {
                            void *localdata);
         int (*o_disconnect)(struct obd_export *exp);
 
-        /* Initialize/finalize fids infrastructure. */
-       int (*o_fid_init)(struct obd_export *exp, enum lu_cli_type type);
-        int (*o_fid_fini)(struct obd_export *exp);
+       /* Initialize/finalize fids infrastructure. */
+       int (*o_fid_init)(struct obd_device *obd,
+                         struct obd_export *exp, enum lu_cli_type type);
+       int (*o_fid_fini)(struct obd_device *obd);
 
         /* Allocate new fid according to passed @hint. */
         int (*o_fid_alloc)(struct obd_export *exp, struct lu_fid *fid,
@@ -1501,91 +1355,67 @@ struct md_open_data {
 struct lookup_intent;
 
 struct md_ops {
-        int (*m_getstatus)(struct obd_export *, struct lu_fid *,
-                           struct obd_capa **);
-        int (*m_change_cbdata)(struct obd_export *, const struct lu_fid *,
-                               ldlm_iterator_t, void *);
-        int (*m_find_cbdata)(struct obd_export *, const struct lu_fid *,
-                             ldlm_iterator_t, void *);
-        int (*m_close)(struct obd_export *, struct md_op_data *,
-                       struct md_open_data *, struct ptlrpc_request **);
-        int (*m_create)(struct obd_export *, struct md_op_data *,
-                        const void *, int, int, __u32, __u32, cfs_cap_t,
-                        __u64, struct ptlrpc_request **);
-        int (*m_done_writing)(struct obd_export *, struct md_op_data  *,
-                              struct md_open_data *);
-        int (*m_enqueue)(struct obd_export *, struct ldlm_enqueue_info *,
-                         struct lookup_intent *, struct md_op_data *,
-                         struct lustre_handle *, void *, int,
+       /* Every operation from MD_STATS_FIRST_OP up to and including
+        * MD_STATS_LAST_OP will be counted by EXP_MD_OP_INCREMENT()
+        * and will appear in /proc/fs/lustre/{lmv,mdc}/.../md_stats.
+        * Operations after MD_STATS_LAST_OP are excluded from stats.
+        * There are a few reasons for doing this: we prune the 17
+        * counters which will be of minimal use in understanding
+        * metadata utilization, we save memory by allocating 15
+        * instead of 32 counters, we save cycles by not counting.
+        *
+        * MD_STATS_FIRST_OP must be the first member of md_ops.
+        */
+#define MD_STATS_FIRST_OP m_close
+       int (*m_close)(struct obd_export *, struct md_op_data *,
+                      struct md_open_data *, struct ptlrpc_request **);
+
+       int (*m_create)(struct obd_export *, struct md_op_data *,
+                       const void *, int, int, __u32, __u32, cfs_cap_t,
+                       __u64, struct ptlrpc_request **);
+
+       int (*m_enqueue)(struct obd_export *, struct ldlm_enqueue_info *,
+                        struct lookup_intent *, struct md_op_data *,
+                        struct lustre_handle *, void *, int,
                         struct ptlrpc_request **, __u64);
-        int (*m_getattr)(struct obd_export *, struct md_op_data *,
-                         struct ptlrpc_request **);
-        int (*m_getattr_name)(struct obd_export *, struct md_op_data *,
-                              struct ptlrpc_request **);
-        int (*m_intent_lock)(struct obd_export *, struct md_op_data *,
-                             void *, int, struct lookup_intent *, int,
-                             struct ptlrpc_request **,
+
+       int (*m_getattr)(struct obd_export *, struct md_op_data *,
+                        struct ptlrpc_request **);
+
+       int (*m_intent_lock)(struct obd_export *, struct md_op_data *,
+                            void *, int, struct lookup_intent *, int,
+                            struct ptlrpc_request **,
                             ldlm_blocking_callback, __u64);
-        int (*m_link)(struct obd_export *, struct md_op_data *,
-                      struct ptlrpc_request **);
-        int (*m_rename)(struct obd_export *, struct md_op_data *,
-                        const char *, int, const char *, int,
-                        struct ptlrpc_request **);
-        int (*m_is_subdir)(struct obd_export *, const struct lu_fid *,
-                           const struct lu_fid *,
-                           struct ptlrpc_request **);
-        int (*m_setattr)(struct obd_export *, struct md_op_data *, void *,
-                         int , void *, int, struct ptlrpc_request **,
-                         struct md_open_data **mod);
-        int (*m_sync)(struct obd_export *, const struct lu_fid *,
-                      struct obd_capa *, struct ptlrpc_request **);
-        int (*m_readpage)(struct obd_export *, struct md_op_data *,
-                          struct page **, struct ptlrpc_request **);
-
-        int (*m_unlink)(struct obd_export *, struct md_op_data *,
-                        struct ptlrpc_request **);
-
-        int (*m_setxattr)(struct obd_export *, const struct lu_fid *,
-                          struct obd_capa *, obd_valid, const char *,
-                          const char *, int, int, int, __u32,
-                          struct ptlrpc_request **);
-
-        int (*m_getxattr)(struct obd_export *, const struct lu_fid *,
-                          struct obd_capa *, obd_valid, const char *,
-                          const char *, int, int, int,
-                          struct ptlrpc_request **);
-
-        int (*m_init_ea_size)(struct obd_export *, int, int, int);
-
-        int (*m_get_lustre_md)(struct obd_export *, struct ptlrpc_request *,
-                               struct obd_export *, struct obd_export *,
-                               struct lustre_md *);
-
-        int (*m_free_lustre_md)(struct obd_export *, struct lustre_md *);
-
-        int (*m_set_open_replay_data)(struct obd_export *,
-                                      struct obd_client_handle *,
-                                      struct ptlrpc_request *);
-        int (*m_clear_open_replay_data)(struct obd_export *,
-                                        struct obd_client_handle *);
-        int (*m_set_lock_data)(struct obd_export *, __u64 *, void *, __u64 *);
 
-       ldlm_mode_t (*m_lock_match)(struct obd_export *, __u64,
-                                    const struct lu_fid *, ldlm_type_t,
-                                    ldlm_policy_data_t *, ldlm_mode_t,
-                                    struct lustre_handle *);
+       int (*m_link)(struct obd_export *, struct md_op_data *,
+                     struct ptlrpc_request **);
 
-        int (*m_cancel_unused)(struct obd_export *, const struct lu_fid *,
-                               ldlm_policy_data_t *, ldlm_mode_t,
-                               ldlm_cancel_flags_t flags, void *opaque);
-        int (*m_renew_capa)(struct obd_export *, struct obd_capa *oc,
-                            renew_capa_cb_t cb);
-        int (*m_unpack_capa)(struct obd_export *, struct ptlrpc_request *,
-                             const struct req_msg_field *, struct obd_capa **);
+       int (*m_rename)(struct obd_export *, struct md_op_data *,
+                       const char *, int, const char *, int,
+                       struct ptlrpc_request **);
+
+       int (*m_setattr)(struct obd_export *, struct md_op_data *, void *,
+                        int , void *, int, struct ptlrpc_request **,
+                        struct md_open_data **mod);
+
+       int (*m_fsync)(struct obd_export *, const struct lu_fid *,
+                      struct obd_capa *, struct ptlrpc_request **);
+
+       int (*m_readpage)(struct obd_export *, struct md_op_data *,
+                         struct page **, struct ptlrpc_request **);
+
+       int (*m_unlink)(struct obd_export *, struct md_op_data *,
+                       struct ptlrpc_request **);
 
-        int (*m_get_remote_perm)(struct obd_export *, const struct lu_fid *,
-                                 struct obd_capa *, __u32,
-                                 struct ptlrpc_request **);
+       int (*m_setxattr)(struct obd_export *, const struct lu_fid *,
+                         struct obd_capa *, obd_valid, const char *,
+                         const char *, int, int, int, __u32,
+                         struct ptlrpc_request **);
+
+       int (*m_getxattr)(struct obd_export *, const struct lu_fid *,
+                         struct obd_capa *, obd_valid, const char *,
+                         const char *, int, int, int,
+                         struct ptlrpc_request **);
 
         int (*m_intent_getattr_async)(struct obd_export *,
                                       struct md_enqueue_info *,
@@ -1593,12 +1423,61 @@ struct md_ops {
 
         int (*m_revalidate_lock)(struct obd_export *, struct lookup_intent *,
                                  struct lu_fid *, __u64 *bits);
+#define MD_STATS_LAST_OP m_revalidate_lock
 
-        /*
-         * NOTE: If adding ops, add another LPROCFS_MD_OP_INIT() line to
-         * lprocfs_alloc_md_stats() in obdclass/lprocfs_status.c. Also, add a
-         * wrapper function in include/linux/obd_class.h.
-         */
+       int (*m_getstatus)(struct obd_export *, struct lu_fid *,
+                          struct obd_capa **);
+
+       int (*m_null_inode)(struct obd_export *, const struct lu_fid *);
+
+       int (*m_find_cbdata)(struct obd_export *, const struct lu_fid *,
+                            ldlm_iterator_t, void *);
+
+       int (*m_done_writing)(struct obd_export *, struct md_op_data  *,
+                             struct md_open_data *);
+
+       int (*m_getattr_name)(struct obd_export *, struct md_op_data *,
+                             struct ptlrpc_request **);
+
+       int (*m_is_subdir)(struct obd_export *, const struct lu_fid *,
+                          const struct lu_fid *,
+                          struct ptlrpc_request **);
+
+       int (*m_init_ea_size)(struct obd_export *, int, int, int);
+
+       int (*m_get_lustre_md)(struct obd_export *, struct ptlrpc_request *,
+                              struct obd_export *, struct obd_export *,
+                              struct lustre_md *);
+
+       int (*m_free_lustre_md)(struct obd_export *, struct lustre_md *);
+
+       int (*m_set_open_replay_data)(struct obd_export *,
+                                     struct obd_client_handle *,
+                                     struct ptlrpc_request *);
+
+       int (*m_clear_open_replay_data)(struct obd_export *,
+                                       struct obd_client_handle *);
+
+       int (*m_set_lock_data)(struct obd_export *, __u64 *, void *, __u64 *);
+
+       ldlm_mode_t (*m_lock_match)(struct obd_export *, __u64,
+                                   const struct lu_fid *, ldlm_type_t,
+                                   ldlm_policy_data_t *, ldlm_mode_t,
+                                   struct lustre_handle *);
+
+       int (*m_cancel_unused)(struct obd_export *, const struct lu_fid *,
+                              ldlm_policy_data_t *, ldlm_mode_t,
+                              ldlm_cancel_flags_t flags, void *opaque);
+
+       int (*m_renew_capa)(struct obd_export *, struct obd_capa *oc,
+                           renew_capa_cb_t cb);
+
+       int (*m_unpack_capa)(struct obd_export *, struct ptlrpc_request *,
+                            const struct req_msg_field *, struct obd_capa **);
+
+       int (*m_get_remote_perm)(struct obd_export *, const struct lu_fid *,
+                                struct obd_capa *, __u32,
+                                struct ptlrpc_request **);
 };
 
 struct lsm_operations {
@@ -1630,8 +1509,6 @@ static inline const struct lsm_operations *lsm_op_find(int magic)
         }
 }
 
-int lvfs_check_io_health(struct obd_device *obd, struct file *file);
-
 /* Requests for obd_extent_calc() */
 #define OBD_CALC_STRIPE_START   1
 #define OBD_CALC_STRIPE_END     2
@@ -1652,13 +1529,13 @@ static inline struct md_open_data *obd_mod_alloc(void)
 }
 
 #define obd_mod_get(mod) cfs_atomic_inc(&(mod)->mod_refcount)
-#define obd_mod_put(mod)                                        \
-({                                                              \
-        if (cfs_atomic_dec_and_test(&(mod)->mod_refcount)) {          \
-                if ((mod)->mod_open_req)                          \
-                        ptlrpc_req_finished((mod)->mod_open_req);   \
-                OBD_FREE_PTR(mod);                              \
-        }                                                       \
+#define obd_mod_put(mod)                                          \
+({                                                                \
+       if (cfs_atomic_dec_and_test(&(mod)->mod_refcount)) {      \
+               if ((mod)->mod_open_req)                          \
+                       ptlrpc_req_finished((mod)->mod_open_req); \
+               OBD_FREE_PTR(mod);                                \
+       }                                                         \
 })
 
 void obdo_from_inode(struct obdo *dst, struct inode *src, obd_flag valid);
@@ -1683,4 +1560,52 @@ static inline const char *lu_dev_name(const struct lu_device *lu_dev)
         return lu_dev->ld_obd->obd_name;
 }
 
+static inline bool filename_is_volatile(const char *name, int namelen, int *idx)
+{
+       const char      *start;
+       char            *end;
+
+       if (strncmp(name, LUSTRE_VOLATILE_HDR, LUSTRE_VOLATILE_HDR_LEN) != 0)
+               return false;
+
+       /* caller does not care of idx */
+       if (idx == NULL)
+               return true;
+
+       /* volatile file, the MDT can be set from name */
+       /* name format is LUSTRE_VOLATILE_HDR:[idx]: */
+       /* if no MDT is specified, use std way */
+       if (namelen < LUSTRE_VOLATILE_HDR_LEN + 2)
+               goto bad_format;
+       /* test for no MDT idx case */
+       if ((*(name + LUSTRE_VOLATILE_HDR_LEN) == ':') &&
+           (*(name + LUSTRE_VOLATILE_HDR_LEN + 1) == ':')) {
+               *idx = -1;
+               return true;
+       }
+       /* we have an idx, read it */
+       start = name + LUSTRE_VOLATILE_HDR_LEN + 1;
+       *idx = strtoul(start, &end, 0);
+       /* error cases:
+        * no digit, no trailing :, negative value
+        */
+       if (((*idx == 0) && (end == start)) ||
+           (*end != ':') || (*idx < 0))
+               goto bad_format;
+
+       return true;
+bad_format:
+       /* bad format of mdt idx, we cannot return an error
+        * to caller so we use hash algo */
+       CERROR("Bad volatile file name format: %s\n",
+              name + LUSTRE_VOLATILE_HDR_LEN);
+       return false;
+}
+
+static inline int cli_brw_size(struct obd_device *obd)
+{
+       LASSERT(obd != NULL);
+       return obd->u.cli.cl_max_pages_per_rpc << PAGE_CACHE_SHIFT;
+}
+
 #endif /* __OBD_H */