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LU-1866 misc: fix some issues found during LFSCK
[fs/lustre-release.git] / lustre / osp / osp_dev.c
index 18ac9a8..9a66737 100644 (file)
@@ -39,6 +39,7 @@
  *
  * Author: Alex Zhuravlev <alexey.zhuravlev@intel.com>
  * Author: Mikhail Pershin <mike.pershin@intel.com>
+ * Author: Di Wang <di.wang@intel.com>
  */
 
 #ifndef EXPORT_SYMTAB
@@ -48,6 +49,8 @@
 
 #include <obd_class.h>
 #include <lustre_param.h>
+#include <lustre_log.h>
+#include <lustre_mdc.h>
 
 #include "osp_internal.h"
 
@@ -69,20 +72,28 @@ struct lu_object *osp_object_alloc(const struct lu_env *env,
                                   const struct lu_object_header *hdr,
                                   struct lu_device *d)
 {
-       struct lu_object_header *h;
+       struct lu_object_header *h = NULL;
        struct osp_object       *o;
        struct lu_object        *l;
 
-       LASSERT(hdr == NULL);
-
        OBD_SLAB_ALLOC_PTR_GFP(o, osp_object_kmem, CFS_ALLOC_IO);
        if (o != NULL) {
                l = &o->opo_obj.do_lu;
-               h = &o->opo_header;
 
-               lu_object_header_init(h);
-               dt_object_init(&o->opo_obj, h, d);
-               lu_object_add_top(h, l);
+               /* For data object, OSP obj would always be the top
+                * object, i.e. hdr is always NULL, see lu_object_alloc.
+                * But for metadata object, we always build the object
+                * stack from MDT. i.e. mdt_object will be the top object
+                * i.e.  hdr != NULL */
+               if (hdr == NULL) {
+                       /* object for OST */
+                       h = &o->opo_header;
+                       lu_object_header_init(h);
+                       dt_object_init(&o->opo_obj, h, d);
+                       lu_object_add_top(h, l);
+               } else {
+                       dt_object_init(&o->opo_obj, h, d);
+               }
 
                l->lo_ops = &osp_lu_obj_ops;
 
@@ -92,106 +103,215 @@ struct lu_object *osp_object_alloc(const struct lu_env *env,
        }
 }
 
-/* Update opd_last_used_id along with checking for gap in objid sequence */
-void osp_update_last_id(struct osp_device *d, obd_id objid)
+static struct dt_object
+*osp_find_or_create(const struct lu_env *env, struct osp_device *osp,
+                   struct lu_attr *attr, __u32 reg_id)
 {
-       /*
-        * we might have lost precreated objects due to VBR and precreate
-        * orphans, the gap in objid can be calculated properly only here
-        */
-       if (objid > le64_to_cpu(d->opd_last_used_id)) {
-               if (objid - le64_to_cpu(d->opd_last_used_id) > 1) {
-                       d->opd_gap_start = le64_to_cpu(d->opd_last_used_id) + 1;
-                       d->opd_gap_count = objid - d->opd_gap_start;
-                       CDEBUG(D_HA, "Gap in objids: %d, start = %llu\n",
-                              d->opd_gap_count, d->opd_gap_start);
-               }
-               d->opd_last_used_id = cpu_to_le64(objid);
+       struct osp_thread_info *osi = osp_env_info(env);
+       struct dt_object_format dof = { 0 };
+       struct dt_object       *dto;
+       int                  rc;
+       ENTRY;
+
+       lu_local_obj_fid(&osi->osi_fid, reg_id);
+       attr->la_valid = LA_MODE;
+       attr->la_mode = S_IFREG | 0644;
+       dof.dof_type = DFT_REGULAR;
+       dto = dt_find_or_create(env, osp->opd_storage, &osi->osi_fid,
+                               &dof, attr);
+       if (IS_ERR(dto))
+               RETURN(dto);
+
+       rc = dt_attr_get(env, dto, attr, NULL);
+       if (rc) {
+               CERROR("%s: can't be initialized: rc = %d\n",
+                      osp->opd_obd->obd_name, rc);
+               lu_object_put(env, &dto->do_lu);
+               RETURN(ERR_PTR(rc));
        }
+       RETURN(dto);
 }
 
-static int osp_last_used_init(const struct lu_env *env, struct osp_device *m)
+static int osp_write_local_file(const struct lu_env *env,
+                               struct osp_device *osp,
+                               struct dt_object *dt_obj,
+                               struct lu_buf *buf,
+                               loff_t offset)
 {
-       struct osp_thread_info  *osi = osp_env_info(env);
-       struct dt_object_format  dof = { 0 };
-       struct dt_object        *o;
-       int                      rc;
+       struct thandle *th;
+       int rc;
 
-       ENTRY;
+       th = dt_trans_create(env, osp->opd_storage);
+       if (IS_ERR(th))
+               RETURN(PTR_ERR(th));
 
-       osi->osi_attr.la_valid = LA_MODE;
-       osi->osi_attr.la_mode = S_IFREG | 0644;
-       lu_local_obj_fid(&osi->osi_fid, MDD_LOV_OBJ_OID);
-       dof.dof_type = DFT_REGULAR;
-       o = dt_find_or_create(env, m->opd_storage, &osi->osi_fid, &dof,
-                             &osi->osi_attr);
-       if (IS_ERR(o))
-               RETURN(PTR_ERR(o));
-
-       rc = dt_attr_get(env, o, &osi->osi_attr, NULL);
+       rc = dt_declare_record_write(env, dt_obj, buf->lb_len, offset, th);
+       if (rc)
+               GOTO(out, rc);
+       rc = dt_trans_start_local(env, osp->opd_storage, th);
        if (rc)
                GOTO(out, rc);
 
-       /* object will be released in device cleanup path */
-       m->opd_last_used_file = o;
+       rc = dt_record_write(env, dt_obj, buf, &offset, th);
+out:
+       dt_trans_stop(env, osp->opd_storage, th);
+       RETURN(rc);
+}
 
-       if (osi->osi_attr.la_size >= sizeof(osi->osi_id) *
-                                    (m->opd_index + 1)) {
-               osp_objid_buf_prep(osi, m, m->opd_index);
-               rc = dt_record_read(env, o, &osi->osi_lb, &osi->osi_off);
+static int osp_init_last_objid(const struct lu_env *env, struct osp_device *osp)
+{
+       struct osp_thread_info  *osi = osp_env_info(env);
+       struct lu_fid           *fid = &osp->opd_last_used_fid;
+       struct dt_object        *dto;
+       int                     rc;
+       ENTRY;
+
+       dto = osp_find_or_create(env, osp, &osi->osi_attr, MDD_LOV_OBJ_OID);
+       if (IS_ERR(dto))
+               RETURN(PTR_ERR(dto));
+       /* object will be released in device cleanup path */
+       if (osi->osi_attr.la_size >=
+           sizeof(osi->osi_id) * (osp->opd_index + 1)) {
+               osp_objid_buf_prep(&osi->osi_lb, &osi->osi_off, &fid->f_oid,
+                                  osp->opd_index);
+               rc = dt_record_read(env, dto, &osi->osi_lb, &osi->osi_off);
                if (rc != 0)
                        GOTO(out, rc);
        } else {
-               /* reset value to 0, just to make sure and change file's size */
-               struct thandle *th;
+               fid->f_oid = 0;
+               osp_objid_buf_prep(&osi->osi_lb, &osi->osi_off, &fid->f_oid,
+                                  osp->opd_index);
+               rc = osp_write_local_file(env, osp, dto, &osi->osi_lb,
+                                         osi->osi_off);
+       }
+       osp->opd_last_used_oid_file = dto;
+       RETURN(0);
+out:
+       /* object will be released in device cleanup path */
+       CERROR("%s: can't initialize lov_objid: rc = %d\n",
+              osp->opd_obd->obd_name, rc);
+       lu_object_put(env, &dto->do_lu);
+       osp->opd_last_used_oid_file = NULL;
+       RETURN(rc);
+}
 
-               m->opd_last_used_id = 0;
-               osp_objid_buf_prep(osi, m, m->opd_index);
+static int osp_init_last_seq(const struct lu_env *env, struct osp_device *osp)
+{
+       struct osp_thread_info  *osi = osp_env_info(env);
+       struct lu_fid           *fid = &osp->opd_last_used_fid;
+       struct dt_object        *dto;
+       int                     rc;
+       ENTRY;
 
-               th = dt_trans_create(env, m->opd_storage);
-               if (IS_ERR(th))
-                       GOTO(out, rc = PTR_ERR(th));
+       dto = osp_find_or_create(env, osp, &osi->osi_attr, MDD_LOV_OBJ_OSEQ);
+       if (IS_ERR(dto))
+               RETURN(PTR_ERR(dto));
 
-               rc = dt_declare_record_write(env, m->opd_last_used_file,
-                                            osi->osi_lb.lb_len, osi->osi_off,
-                                            th);
-               if (rc) {
-                       dt_trans_stop(env, m->opd_storage, th);
+       /* object will be released in device cleanup path */
+       if (osi->osi_attr.la_size >=
+           sizeof(osi->osi_id) * (osp->opd_index + 1)) {
+               osp_objseq_buf_prep(&osi->osi_lb, &osi->osi_off, &fid->f_seq,
+                                  osp->opd_index);
+               rc = dt_record_read(env, dto, &osi->osi_lb, &osi->osi_off);
+               if (rc != 0)
                        GOTO(out, rc);
-               }
+       } else {
+               fid->f_seq = 0;
+               osp_objseq_buf_prep(&osi->osi_lb, &osi->osi_off, &fid->f_seq,
+                                   osp->opd_index);
+               rc = osp_write_local_file(env, osp, dto, &osi->osi_lb,
+                                         osi->osi_off);
+       }
+       osp->opd_last_used_seq_file = dto;
+       RETURN(0);
+out:
+       /* object will be released in device cleanup path */
+       CERROR("%s: can't initialize lov_seq: rc = %d\n",
+              osp->opd_obd->obd_name, rc);
+       lu_object_put(env, &dto->do_lu);
+       osp->opd_last_used_seq_file = NULL;
+       RETURN(rc);
+}
 
-               rc = dt_trans_start_local(env, m->opd_storage, th);
+static int osp_last_used_init(const struct lu_env *env, struct osp_device *osp)
+{
+       struct osp_thread_info *osi = osp_env_info(env);
+       int                  rc;
+       ENTRY;
+
+       fid_zero(&osp->opd_last_used_fid);
+       rc = osp_init_last_objid(env, osp);
+       if (rc < 0) {
+               CERROR("%s: Can not get ids %d from old objid!\n",
+                      osp->opd_obd->obd_name, rc);
+               RETURN(rc);
+       }
+
+       rc = osp_init_last_seq(env, osp);
+       if (rc < 0) {
+               CERROR("%s: Can not get ids %d from old objid!\n",
+                      osp->opd_obd->obd_name, rc);
+               GOTO(out, rc);
+       }
+
+       if (fid_oid(&osp->opd_last_used_fid) != 0 &&
+           fid_seq(&osp->opd_last_used_fid) == 0) {
+               /* Just upgrade from the old version,
+                * set the seq to be IDIF */
+               osp->opd_last_used_fid.f_seq =
+                  fid_idif_seq(fid_oid(&osp->opd_last_used_fid),
+                               osp->opd_index);
+               osp_objseq_buf_prep(&osi->osi_lb, &osi->osi_off,
+                                   &osp->opd_last_used_fid.f_seq,
+                                   osp->opd_index);
+               rc = osp_write_local_file(env, osp, osp->opd_last_used_seq_file,
+                                         &osi->osi_lb, osi->osi_off);
                if (rc) {
-                       dt_trans_stop(env, m->opd_storage, th);
+                       CERROR("%s : Can not write seq file: rc = %d\n",
+                              osp->opd_obd->obd_name, rc);
                        GOTO(out, rc);
                }
+       }
 
-               rc = dt_record_write(env, m->opd_last_used_file, &osi->osi_lb,
-                                    &osi->osi_off, th);
-               dt_trans_stop(env, m->opd_storage, th);
-               if (rc)
-                       GOTO(out, rc);
+       if (!fid_is_zero(&osp->opd_last_used_fid) &&
+                !fid_is_sane(&osp->opd_last_used_fid)) {
+               CERROR("%s: Got invalid FID "DFID"\n", osp->opd_obd->obd_name,
+                       PFID(&osp->opd_last_used_fid));
+               GOTO(out, rc = -EINVAL);
        }
-       CDEBUG(D_HA, "%s: Read last used ID: "LPU64"\n", m->opd_obd->obd_name,
-              le64_to_cpu(m->opd_last_used_id));
-       RETURN(0);
+
+       CDEBUG(D_INFO, "%s: Init last used fid "DFID"\n",
+              osp->opd_obd->obd_name, PFID(&osp->opd_last_used_fid));
 out:
-       CERROR("%s: can't initialize lov_objid: %d\n",
-              m->opd_obd->obd_name, rc);
-       lu_object_put(env, &o->do_lu);
-       m->opd_last_used_file = NULL;
-       return rc;
+       if (rc != 0) {
+               if (osp->opd_last_used_oid_file != NULL) {
+                       lu_object_put(env, &osp->opd_last_used_oid_file->do_lu);
+                       osp->opd_last_used_oid_file = NULL;
+               }
+               if (osp->opd_last_used_seq_file != NULL) {
+                       lu_object_put(env, &osp->opd_last_used_seq_file->do_lu);
+                       osp->opd_last_used_seq_file = NULL;
+               }
+       }
+
+       RETURN(rc);
 }
 
 static void osp_last_used_fini(const struct lu_env *env, struct osp_device *d)
 {
-       if (d->opd_last_used_file != NULL) {
-               lu_object_put(env, &d->opd_last_used_file->do_lu);
-               d->opd_last_used_file = NULL;
+       /* release last_used file */
+       if (d->opd_last_used_oid_file != NULL) {
+               lu_object_put(env, &d->opd_last_used_oid_file->do_lu);
+               d->opd_last_used_oid_file = NULL;
+       }
+
+       if (d->opd_last_used_seq_file != NULL) {
+               lu_object_put(env, &d->opd_last_used_seq_file->do_lu);
+               d->opd_last_used_seq_file = NULL;
        }
 }
 
-int osp_disconnect(struct osp_device *d)
+static int osp_disconnect(struct osp_device *d)
 {
        struct obd_import *imp;
        int rc = 0;
@@ -230,22 +350,22 @@ static int osp_shutdown(const struct lu_env *env, struct osp_device *d)
        int                      rc = 0;
        ENTRY;
 
-       if (is_osp_on_ost(d->opd_obd->obd_name)) {
-               rc = osp_disconnect(d);
-               RETURN(rc);
-       }
-
        LASSERT(env);
        /* release last_used file */
-       osp_last_used_fini(env, d);
+       if (!d->opd_connect_mdt)
+               osp_last_used_fini(env, d);
 
        rc = osp_disconnect(d);
 
-       /* stop precreate thread */
-       osp_precreate_fini(d);
+       if (!d->opd_connect_mdt) {
+               /* stop precreate thread */
+               osp_precreate_fini(d);
 
-       /* stop sync thread */
-       osp_sync_fini(d);
+               /* stop sync thread */
+               osp_sync_fini(d);
+       }
+
+       obd_fid_fini(d->opd_obd);
 
        RETURN(rc);
 }
@@ -260,9 +380,11 @@ static int osp_process_config(const struct lu_env *env,
        ENTRY;
 
        switch (lcfg->lcfg_command) {
+       case LCFG_PRE_CLEANUP:
+               rc = osp_disconnect(d);
+               break;
        case LCFG_CLEANUP:
-               if (!is_osp_on_ost(d->opd_obd->obd_name))
-                       lu_dev_del_linkage(dev->ld_site, dev);
+               lu_dev_del_linkage(dev->ld_site, dev);
                rc = osp_shutdown(env, d);
                break;
        case LCFG_PARAM:
@@ -302,7 +424,8 @@ static int osp_recovery_complete(const struct lu_env *env,
 
        ENTRY;
        osp->opd_recovery_completed = 1;
-       cfs_waitq_signal(&osp->opd_pre_waitq);
+       if (!osp->opd_connect_mdt)
+               cfs_waitq_signal(&osp->opd_pre_waitq);
        RETURN(rc);
 }
 
@@ -333,8 +456,15 @@ static int osp_statfs(const struct lu_env *env, struct dt_device *dev,
         * layer above osp (usually lod) can use ffree to estimate
         * how many objects are available for immediate creation
         */
+
        spin_lock(&d->opd_pre_lock);
-       sfs->os_fprecreated = d->opd_pre_last_created - d->opd_pre_used_id;
+       LASSERTF(fid_seq(&d->opd_pre_last_created_fid) ==
+                fid_seq(&d->opd_pre_used_fid),
+                "last_created "DFID", next_fid "DFID"\n",
+                PFID(&d->opd_pre_last_created_fid),
+                PFID(&d->opd_pre_used_fid));
+       sfs->os_fprecreated = fid_oid(&d->opd_pre_last_created_fid) -
+                             fid_oid(&d->opd_pre_used_fid);
        sfs->os_fprecreated -= d->opd_pre_reserved;
        spin_unlock(&d->opd_pre_lock);
 
@@ -361,6 +491,8 @@ static int osp_sync(const struct lu_env *env, struct dt_device *dev)
 const struct dt_device_operations osp_dt_ops = {
        .dt_statfs      = osp_statfs,
        .dt_sync        = osp_sync,
+       .dt_trans_start = osp_trans_start,
+       .dt_trans_stop  = osp_trans_stop,
 };
 
 static int osp_connect_to_osd(const struct lu_env *env, struct osp_device *m,
@@ -406,11 +538,11 @@ out:
 static int osp_init0(const struct lu_env *env, struct osp_device *m,
                     struct lu_device_type *ldt, struct lustre_cfg *cfg)
 {
-       struct obd_device               *obd;
-       struct obd_import               *imp;
-       class_uuid_t                     uuid;
-       char                            *src, *ost, *mdt, *osdname = NULL;
-       int                              rc, idx;
+       struct obd_device       *obd;
+       struct obd_import       *imp;
+       class_uuid_t            uuid;
+       char                    *src, *tgt, *mdt, *osdname = NULL;
+       int                     rc, idx;
 
        ENTRY;
 
@@ -436,27 +568,75 @@ static int osp_init0(const struct lu_env *env, struct osp_device *m,
        if (src == NULL)
                RETURN(-EINVAL);
 
-       ost = strstr(src, "-OST");
-       if (ost == NULL)
+       tgt = strrchr(src, '-');
+       if (tgt == NULL) {
+               CERROR("%s: invalid target name %s\n",
+                      m->opd_obd->obd_name, lustre_cfg_string(cfg, 0));
                RETURN(-EINVAL);
-
-       idx = simple_strtol(ost + 4, &mdt, 16);
-       if (mdt[0] != '-' || idx > INT_MAX || idx < 0) {
-               CERROR("%s: invalid OST index in '%s'\n", obd->obd_name, src);
-               GOTO(out_fini, rc = -EINVAL);
        }
-       m->opd_index = idx;
 
-       idx = ost - src;
+       if (strncmp(tgt, "-osc", 4) == 0) {
+               /* Old OSC name fsname-OSTXXXX-osc */
+               for (tgt--; tgt > src && *tgt != '-'; tgt--)
+                       ;
+               if (tgt == src) {
+                       CERROR("%s: invalid target name %s\n",
+                              m->opd_obd->obd_name, lustre_cfg_string(cfg, 0));
+                       RETURN(-EINVAL);
+               }
+
+               if (strncmp(tgt, "-OST", 4) != 0) {
+                       CERROR("%s: invalid target name %s\n",
+                              m->opd_obd->obd_name, lustre_cfg_string(cfg, 0));
+                       RETURN(-EINVAL);
+               }
+
+               idx = simple_strtol(tgt + 4, &mdt, 16);
+               if (mdt[0] != '-' || idx > INT_MAX || idx < 0) {
+                       CERROR("%s: invalid OST index in '%s'\n",
+                              m->opd_obd->obd_name, src);
+                       RETURN(-EINVAL);
+               }
+               m->opd_index = idx;
+               idx = tgt - src;
+       } else {
+               /* New OSC name fsname-OSTXXXX-osc-MDTXXXX */
+               if (strncmp(tgt, "-MDT", 4) != 0 &&
+                        strncmp(tgt, "-OST", 4) != 0) {
+                       CERROR("%s: invalid target name %s\n",
+                              m->opd_obd->obd_name, lustre_cfg_string(cfg, 0));
+                       RETURN(-EINVAL);
+               }
+
+               if (tgt - src <= 12) {
+                       CERROR("%s: invalid target name %s\n",
+                              m->opd_obd->obd_name, lustre_cfg_string(cfg, 0));
+                       RETURN(-EINVAL);
+               }
+
+               if (strncmp(tgt - 12, "-MDT", 4) == 0)
+                       m->opd_connect_mdt = 1;
+
+               idx = simple_strtol(tgt - 8, &mdt, 16);
+               if (mdt[0] != '-' || idx > INT_MAX || idx < 0) {
+                       CERROR("%s: invalid OST index in '%s'\n",
+                              m->opd_obd->obd_name, src);
+                       RETURN(-EINVAL);
+               }
+
+               m->opd_index = idx;
+               idx = tgt - src - 12;
+       }
        /* check the fsname length, and after this everything else will fit */
        if (idx > MTI_NAME_MAXLEN) {
-               CERROR("%s: fsname too long in '%s'\n", obd->obd_name, src);
-               GOTO(out_fini, rc = -EINVAL);
+               CERROR("%s: fsname too long in '%s'\n",
+                      m->opd_obd->obd_name, src);
+               RETURN(-EINVAL);
        }
 
        OBD_ALLOC(osdname, MAX_OBD_NAME);
        if (osdname == NULL)
-               GOTO(out_fini, rc = -ENOMEM);
+               RETURN(-ENOMEM);
 
        memcpy(osdname, src, idx); /* copy just the fsname part */
        osdname[idx] = '\0';
@@ -469,6 +649,15 @@ static int osp_init0(const struct lu_env *env, struct osp_device *m,
        strcat(osdname, "-osd");
        CDEBUG(D_HA, "%s: connect to %s (%s)\n", obd->obd_name, osdname, src);
 
+       if (m->opd_connect_mdt) {
+               struct client_obd *cli = &m->opd_obd->u.cli;
+
+               OBD_ALLOC(cli->cl_rpc_lock, sizeof(*cli->cl_rpc_lock));
+               if (!cli->cl_rpc_lock)
+                       RETURN(-ENOMEM);
+               osp_init_rpc_lock(cli->cl_rpc_lock);
+       }
+
        m->opd_dt_dev.dd_lu_dev.ld_ops = &osp_lu_ops;
        m->opd_dt_dev.dd_ops = &osp_dt_ops;
        obd->obd_lu_dev = &m->opd_dt_dev.dd_lu_dev;
@@ -489,28 +678,33 @@ static int osp_init0(const struct lu_env *env, struct osp_device *m,
 
        osp_lprocfs_init(m);
 
-       /*
-        * Initialize last id from the storage - will be used in orphan cleanup
-        */
-       rc = osp_last_used_init(env, m);
-       if (rc)
-               GOTO(out_proc, rc);
-
-       /*
-        * Initialize precreation thread, it handles new connections as well
-        */
-       rc = osp_init_precreate(m);
-       if (rc)
-               GOTO(out_last_used, rc);
-
-       /*
-        * Initialize synhronization mechanism taking care of propogating
-        * changes to OST in near transactional manner
-        */
-       rc = osp_sync_init(env, m);
-       if (rc)
-               GOTO(out_precreat, rc);
+       if (!m->opd_connect_mdt) {
+               /* Initialize last id from the storage - will be
+                * used in orphan cleanup. */
+               rc = osp_last_used_init(env, m);
+               if (rc)
+                       GOTO(out_proc, rc);
+               /* Initialize precreation thread, it handles new
+                * connections as well. */
+               rc = osp_init_precreate(m);
+               if (rc)
+                       GOTO(out_last_used, rc);
+               /*
+                * Initialize synhronization mechanism taking
+                * care of propogating changes to OST in near
+                * transactional manner.
+                */
+               rc = osp_sync_init(env, m);
+               if (rc)
+                       GOTO(out_precreat, rc);
 
+               rc = obd_fid_init(m->opd_obd, NULL, LUSTRE_SEQ_DATA);
+               if (rc) {
+                       CERROR("%s: fid init error: rc = %d\n",
+                              m->opd_obd->obd_name, rc);
+                       GOTO(out, rc);
+               }
+       }
        /*
         * Initiate connect to OST
         */
@@ -527,21 +721,30 @@ static int osp_init0(const struct lu_env *env, struct osp_device *m,
        RETURN(0);
 
 out:
-       /* stop sync thread */
-       osp_sync_fini(m);
+       if (!m->opd_connect_mdt)
+               /* stop sync thread */
+               osp_sync_fini(m);
 out_precreat:
        /* stop precreate thread */
-       osp_precreate_fini(m);
+       if (!m->opd_connect_mdt)
+               osp_precreate_fini(m);
 out_last_used:
        osp_last_used_fini(env, m);
 out_proc:
        ptlrpc_lprocfs_unregister_obd(obd);
        lprocfs_obd_cleanup(obd);
-       class_destroy_import(obd->u.cli.cl_import);
+       obd_cleanup_client_import(obd);
        client_obd_cleanup(obd);
 out_ref:
        ptlrpcd_decref();
 out_disconnect:
+       if (m->opd_connect_mdt) {
+               struct client_obd *cli = &m->opd_obd->u.cli;
+               if (cli->cl_rpc_lock != NULL) {
+                       OBD_FREE_PTR(cli->cl_rpc_lock);
+                       cli->cl_rpc_lock = NULL;
+               }
+       }
        obd_disconnect(m->opd_storage_exp);
 out_fini:
        if (osdname)
@@ -580,10 +783,7 @@ static struct lu_device *osp_device_alloc(const struct lu_env *env,
 
                l = osp2lu_dev(m);
                dt_device_init(&m->opd_dt_dev, t);
-               if (is_osp_on_ost(lustre_cfg_string(lcfg, 0)))
-                       rc = osp_init_for_ost(env, m, t, lcfg);
-               else
-                       rc = osp_init0(env, m, t, lcfg);
+               rc = osp_init0(env, m, t, lcfg);
                if (rc != 0) {
                        osp_device_free(env, l);
                        l = ERR_PTR(rc);
@@ -604,9 +804,6 @@ static struct lu_device *osp_device_fini(const struct lu_env *env,
        if (m->opd_storage_exp)
                obd_disconnect(m->opd_storage_exp);
 
-       if (is_osp_on_ost(m->opd_obd->obd_name))
-               osp_fini_for_ost(m);
-
        imp = m->opd_obd->u.cli.cl_import;
 
        if (imp->imp_rq_pool) {
@@ -623,6 +820,14 @@ static struct lu_device *osp_device_fini(const struct lu_env *env,
        ptlrpc_lprocfs_unregister_obd(m->opd_obd);
        lprocfs_obd_cleanup(m->opd_obd);
 
+       if (m->opd_connect_mdt) {
+               struct client_obd *cli = &m->opd_obd->u.cli;
+               if (cli->cl_rpc_lock != NULL) {
+                       OBD_FREE_PTR(cli->cl_rpc_lock);
+                       cli->cl_rpc_lock = NULL;
+               }
+       }
+
        rc = client_obd_cleanup(m->opd_obd);
        LASSERTF(rc == 0, "error %d\n", rc);
 
@@ -662,36 +867,23 @@ static int osp_obd_connect(const struct lu_env *env, struct obd_export **exp,
                RETURN(rc);
 
        *exp = class_conn2export(&conn);
-       if (is_osp_on_ost(obd->obd_name))
-               osp->opd_exp = *exp;
-
        /* Why should there ever be more than 1 connect? */
        osp->opd_connects++;
        LASSERT(osp->opd_connects == 1);
 
+       osp->opd_exp = *exp;
+
        imp = osp->opd_obd->u.cli.cl_import;
        imp->imp_dlm_handle = conn;
 
+       LASSERT(data != NULL);
+       LASSERT(data->ocd_connect_flags & OBD_CONNECT_INDEX);
        ocd = &imp->imp_connect_data;
-       ocd->ocd_connect_flags = OBD_CONNECT_AT |
-                                OBD_CONNECT_FULL20 |
-                                OBD_CONNECT_INDEX |
-#ifdef HAVE_LRU_RESIZE_SUPPORT
-                                OBD_CONNECT_LRU_RESIZE |
-#endif
-                                OBD_CONNECT_MDS |
-                                OBD_CONNECT_OSS_CAPA |
-                                OBD_CONNECT_REQPORTAL |
-                                OBD_CONNECT_SKIP_ORPHAN |
-                                OBD_CONNECT_VERSION |
-                                OBD_CONNECT_FID |
-                                OBD_CONNECT_LVB_TYPE;
+       *ocd = *data;
 
-       if (is_osp_on_ost(osp->opd_obd->obd_name))
-               ocd->ocd_connect_flags |= OBD_CONNECT_LIGHTWEIGHT;
+       imp->imp_connect_flags_orig = ocd->ocd_connect_flags;
 
        ocd->ocd_version = LUSTRE_VERSION_CODE;
-       LASSERT(data->ocd_connect_flags & OBD_CONNECT_INDEX);
        ocd->ocd_index = data->ocd_index;
        imp->imp_connect_flags_orig = ocd->ocd_connect_flags;
 
@@ -703,6 +895,14 @@ static int osp_obd_connect(const struct lu_env *env, struct obd_export **exp,
 
        ptlrpc_pinger_add_import(imp);
 
+       if (osp->opd_connect_mdt && data->ocd_index == 0) {
+               /* set seq controller export for MDC0 if exists */
+               struct seq_server_site *ss;
+
+               ss = lu_site2seq(osp2lu_dev(osp)->ld_site);
+               ss->ss_control_exp = class_export_get(*exp);
+               ss->ss_server_fld->lsf_control_exp = *exp;
+       }
 out:
        RETURN(rc);
 }
@@ -730,8 +930,7 @@ static int osp_obd_disconnect(struct obd_export *exp)
        }
 
        /* destroy the device */
-       if (!is_osp_on_ost(obd->obd_name))
-               class_manual_cleanup(obd);
+       class_manual_cleanup(obd);
 
        RETURN(rc);
 }
@@ -811,7 +1010,7 @@ static int osp_import_event(struct obd_device *obd, struct obd_import *imp,
        case IMP_EVENT_DISCON:
                d->opd_got_disconnected = 1;
                d->opd_imp_connected = 0;
-               if (is_osp_on_ost(d->opd_obd->obd_name))
+               if (d->opd_connect_mdt)
                        break;
                osp_pre_update_status(d, -ENODEV);
                cfs_waitq_signal(&d->opd_pre_waitq);
@@ -819,7 +1018,7 @@ static int osp_import_event(struct obd_device *obd, struct obd_import *imp,
                break;
        case IMP_EVENT_INACTIVE:
                d->opd_imp_active = 0;
-               if (is_osp_on_ost(d->opd_obd->obd_name))
+               if (d->opd_connect_mdt)
                        break;
                osp_pre_update_status(d, -ENODEV);
                cfs_waitq_signal(&d->opd_pre_waitq);
@@ -831,7 +1030,7 @@ static int osp_import_event(struct obd_device *obd, struct obd_import *imp,
                        d->opd_new_connection = 1;
                d->opd_imp_connected = 1;
                d->opd_imp_seen_connected = 1;
-               if (is_osp_on_ost(d->opd_obd->obd_name))
+               if (d->opd_connect_mdt)
                        break;
                cfs_waitq_signal(&d->opd_pre_waitq);
                __osp_sync_check_for_work(d);
@@ -969,8 +1168,12 @@ static struct obd_ops osp_obd_device_ops = {
        .o_import_event = osp_import_event,
        .o_iocontrol    = osp_iocontrol,
        .o_statfs       = osp_obd_statfs,
+       .o_fid_init     = client_fid_init,
+       .o_fid_fini     = client_fid_fini,
 };
 
+struct llog_operations osp_mds_ost_orig_logops;
+
 static int __init osp_mod_init(void)
 {
        struct lprocfs_static_vars       lvars;
@@ -992,6 +1195,21 @@ static int __init osp_mod_init(void)
                return rc;
        }
 
+       lprocfs_lwp_init_vars(&lvars);
+
+       rc = class_register_type(&lwp_obd_device_ops, NULL, lvars.module_vars,
+                                LUSTRE_LWP_NAME, &lwp_device_type);
+       if (rc != 0) {
+               class_unregister_type(LUSTRE_OSP_NAME);
+               lu_kmem_fini(osp_caches);
+               return rc;
+       }
+
+       /* Note: add_rec/delcare_add_rec will be only used by catalogs */
+       osp_mds_ost_orig_logops = llog_osd_ops;
+       osp_mds_ost_orig_logops.lop_add = llog_cat_add_rec;
+       osp_mds_ost_orig_logops.lop_declare_add = llog_cat_declare_add_rec;
+
        osc_proc_dir = lprocfs_srch(proc_lustre_root, "osc");
        if (osc_proc_dir == NULL) {
                osc_proc_dir = lprocfs_register("osc", proc_lustre_root, NULL,
@@ -1007,6 +1225,7 @@ static void __exit osp_mod_exit(void)
 {
        lprocfs_try_remove_proc_entry("osc", proc_lustre_root);
 
+       class_unregister_type(LUSTRE_LWP_NAME);
        class_unregister_type(LUSTRE_OSP_NAME);
        lu_kmem_fini(osp_caches);
 }