X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lustre%2Fmdt%2Fmdt_io.c;h=3dcc8a8a66706462e91fecbdc292d6253e7a9e24;hb=72479a52be5f77f601d8234d957f5d6176edf6e8;hp=6924296cd680a612c4564320a0498b7f959360b5;hpb=238a309ea6081163c1928630414ee9767746beaa;p=fs%2Flustre-release.git diff --git a/lustre/mdt/mdt_io.c b/lustre/mdt/mdt_io.c index 6924296..3dcc8a8 100644 --- a/lustre/mdt/mdt_io.c +++ b/lustre/mdt/mdt_io.c @@ -20,7 +20,7 @@ * GPL HEADER END */ /* - * Copyright (c) 2012, 2017 Intel Corporation. + * Copyright (c) 2017, Intel Corporation. */ /* * lustre/mdt/mdt_io.c @@ -61,6 +61,320 @@ static inline void mdt_dom_write_unlock(struct mdt_object *mo) up_write(&mo->mot_dom_sem); } +/** + * Lock prolongation for Data-on-MDT. + * This is similar to OFD code but for DOM ibits lock. + */ +static inline time64_t prolong_timeout(struct ptlrpc_request *req) +{ + struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt; + time64_t req_timeout; + + if (AT_OFF) + return obd_timeout / 2; + + req_timeout = req->rq_deadline - req->rq_arrival_time.tv_sec; + return max_t(time64_t, at_est2timeout(at_get(&svcpt->scp_at_estimate)), + req_timeout); +} + +static void mdt_dom_resource_prolong(struct ldlm_prolong_args *arg) +{ + struct ldlm_resource *res; + struct ldlm_lock *lock; + + ENTRY; + + res = ldlm_resource_get(arg->lpa_export->exp_obd->obd_namespace, NULL, + &arg->lpa_resid, LDLM_EXTENT, 0); + if (IS_ERR(res)) { + CDEBUG(D_DLMTRACE, + "Failed to get resource for resid %llu/%llu\n", + arg->lpa_resid.name[0], arg->lpa_resid.name[1]); + RETURN_EXIT; + } + + lock_res(res); + list_for_each_entry(lock, &res->lr_granted, l_res_link) { + if (ldlm_has_dom(lock)) { + LDLM_DEBUG(lock, "DOM lock to prolong "); + ldlm_lock_prolong_one(lock, arg); + break; + } + } + unlock_res(res); + ldlm_resource_putref(res); + + EXIT; +} + +static void mdt_prolong_dom_lock(struct tgt_session_info *tsi, + struct ldlm_prolong_args *data) +{ + struct obdo *oa = &tsi->tsi_ost_body->oa; + struct ldlm_lock *lock; + + ENTRY; + + data->lpa_timeout = prolong_timeout(tgt_ses_req(tsi)); + data->lpa_export = tsi->tsi_exp; + data->lpa_resid = tsi->tsi_resid; + + CDEBUG(D_RPCTRACE, "Prolong DOM lock for req %p with x%llu\n", + tgt_ses_req(tsi), tgt_ses_req(tsi)->rq_xid); + + if (oa->o_valid & OBD_MD_FLHANDLE) { + /* mostly a request should be covered by only one lock, try + * fast path. */ + lock = ldlm_handle2lock(&oa->o_handle); + if (lock != NULL) { + LASSERT(lock->l_export == data->lpa_export); + ldlm_lock_prolong_one(lock, data); + lock->l_last_used = ktime_get(); + LDLM_LOCK_PUT(lock); + if (data->lpa_locks_cnt > 0) + RETURN_EXIT; + } + } + mdt_dom_resource_prolong(data); + EXIT; +} + +static int mdt_rw_hpreq_lock_match(struct ptlrpc_request *req, + struct ldlm_lock *lock) +{ + struct obd_ioobj *ioo; + enum ldlm_mode mode; + __u32 opc = lustre_msg_get_opc(req->rq_reqmsg); + + ENTRY; + + if (!(lock->l_policy_data.l_inodebits.bits & MDS_INODELOCK_DOM)) + RETURN(0); + + ioo = req_capsule_client_get(&req->rq_pill, &RMF_OBD_IOOBJ); + LASSERT(ioo != NULL); + + LASSERT(lock->l_resource != NULL); + if (!fid_res_name_eq(&ioo->ioo_oid.oi_fid, &lock->l_resource->lr_name)) + RETURN(0); + + /* a bulk write can only hold a reference on a PW extent lock. */ + mode = LCK_PW; + if (opc == OST_READ) + /* whereas a bulk read can be protected by either a PR or PW + * extent lock */ + mode |= LCK_PR; + + if (!(lock->l_granted_mode & mode)) + RETURN(0); + + RETURN(1); +} + +static int mdt_rw_hpreq_check(struct ptlrpc_request *req) +{ + struct tgt_session_info *tsi; + struct obd_ioobj *ioo; + struct niobuf_remote *rnb; + int opc; + struct ldlm_prolong_args pa = { 0 }; + + ENTRY; + + /* Don't use tgt_ses_info() to get session info, because lock_match() + * can be called while request has no processing thread yet. */ + tsi = lu_context_key_get(&req->rq_session, &tgt_session_key); + + /* + * Use LASSERT below because malformed RPCs should have + * been filtered out in tgt_hpreq_handler(). + */ + opc = lustre_msg_get_opc(req->rq_reqmsg); + LASSERT(opc == OST_READ || opc == OST_WRITE); + + ioo = req_capsule_client_get(&req->rq_pill, &RMF_OBD_IOOBJ); + LASSERT(ioo != NULL); + + rnb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE); + LASSERT(rnb != NULL); + LASSERT(!(rnb->rnb_flags & OBD_BRW_SRVLOCK)); + + pa.lpa_mode = LCK_PW; + if (opc == OST_READ) + pa.lpa_mode |= LCK_PR; + + DEBUG_REQ(D_RPCTRACE, req, "%s %s: refresh rw locks: "DFID"\n", + tgt_name(tsi->tsi_tgt), current->comm, PFID(&tsi->tsi_fid)); + + mdt_prolong_dom_lock(tsi, &pa); + + if (pa.lpa_blocks_cnt > 0) { + CDEBUG(D_DLMTRACE, + "%s: refreshed %u locks timeout for req %p.\n", + tgt_name(tsi->tsi_tgt), pa.lpa_blocks_cnt, req); + RETURN(1); + } + + RETURN(pa.lpa_locks_cnt > 0 ? 0 : -ESTALE); +} + +static void mdt_rw_hpreq_fini(struct ptlrpc_request *req) +{ + mdt_rw_hpreq_check(req); +} + +static struct ptlrpc_hpreq_ops mdt_hpreq_rw = { + .hpreq_lock_match = mdt_rw_hpreq_lock_match, + .hpreq_check = mdt_rw_hpreq_check, + .hpreq_fini = mdt_rw_hpreq_fini +}; + +/** + * Assign high priority operations to an IO request. + * + * Check if the incoming request is a candidate for + * high-priority processing. If it is, assign it a high + * priority operations table. + * + * \param[in] tsi target session environment for this request + */ +void mdt_hp_brw(struct tgt_session_info *tsi) +{ + struct niobuf_remote *rnb; + struct obd_ioobj *ioo; + + ENTRY; + + ioo = req_capsule_client_get(tsi->tsi_pill, &RMF_OBD_IOOBJ); + LASSERT(ioo != NULL); /* must exist after request preprocessing */ + if (ioo->ioo_bufcnt > 0) { + rnb = req_capsule_client_get(tsi->tsi_pill, &RMF_NIOBUF_REMOTE); + LASSERT(rnb != NULL); /* must exist after preprocessing */ + + /* no high priority if server lock is needed */ + if (rnb->rnb_flags & OBD_BRW_SRVLOCK || + (lustre_msg_get_flags(tgt_ses_req(tsi)->rq_reqmsg) & + MSG_REPLAY)) + return; + } + tgt_ses_req(tsi)->rq_ops = &mdt_hpreq_rw; +} + +static int mdt_punch_hpreq_lock_match(struct ptlrpc_request *req, + struct ldlm_lock *lock) +{ + struct tgt_session_info *tsi; + struct obdo *oa; + + ENTRY; + + /* Don't use tgt_ses_info() to get session info, because lock_match() + * can be called while request has no processing thread yet. */ + tsi = lu_context_key_get(&req->rq_session, &tgt_session_key); + + /* + * Use LASSERT below because malformed RPCs should have + * been filtered out in tgt_hpreq_handler(). + */ + LASSERT(tsi->tsi_ost_body != NULL); + if (tsi->tsi_ost_body->oa.o_valid & OBD_MD_FLHANDLE && + tsi->tsi_ost_body->oa.o_handle.cookie == lock->l_handle.h_cookie) + RETURN(1); + + oa = &tsi->tsi_ost_body->oa; + + LASSERT(lock->l_resource != NULL); + if (!fid_res_name_eq(&oa->o_oi.oi_fid, &lock->l_resource->lr_name)) + RETURN(0); + + if (!(lock->l_granted_mode & LCK_PW)) + RETURN(0); + + RETURN(1); +} + +/** + * Implementation of ptlrpc_hpreq_ops::hpreq_lock_check for OST_PUNCH request. + * + * High-priority queue request check for whether the given punch request + * (\a req) is blocking an LDLM lock cancel. Also checks whether the request is + * covered by an LDLM lock. + * + + * + * \param[in] req the incoming request + * + * \retval 1 if \a req is blocking an LDLM lock cancel + * \retval 0 if it is not + * \retval -ESTALE if lock is not found + */ +static int mdt_punch_hpreq_check(struct ptlrpc_request *req) +{ + struct tgt_session_info *tsi; + struct obdo *oa; + struct ldlm_prolong_args pa = { 0 }; + + ENTRY; + + /* Don't use tgt_ses_info() to get session info, because lock_match() + * can be called while request has no processing thread yet. */ + tsi = lu_context_key_get(&req->rq_session, &tgt_session_key); + LASSERT(tsi != NULL); + oa = &tsi->tsi_ost_body->oa; + + LASSERT(!(oa->o_valid & OBD_MD_FLFLAGS && + oa->o_flags & OBD_FL_SRVLOCK)); + + pa.lpa_mode = LCK_PW; + + CDEBUG(D_DLMTRACE, "%s: refresh DOM lock for "DFID"\n", + tgt_name(tsi->tsi_tgt), PFID(&tsi->tsi_fid)); + + mdt_prolong_dom_lock(tsi, &pa); + + + if (pa.lpa_blocks_cnt > 0) { + CDEBUG(D_DLMTRACE, + "%s: refreshed %u locks timeout for req %p.\n", + tgt_name(tsi->tsi_tgt), pa.lpa_blocks_cnt, req); + RETURN(1); + } + + RETURN(pa.lpa_locks_cnt > 0 ? 0 : -ESTALE); +} + +/** + * Implementation of ptlrpc_hpreq_ops::hpreq_lock_fini for OST_PUNCH request. + * + * Called after the request has been handled. It refreshes lock timeout again + * so that client has more time to send lock cancel RPC. + * + * \param[in] req request which is being processed. + */ +static void mdt_punch_hpreq_fini(struct ptlrpc_request *req) +{ + mdt_punch_hpreq_check(req); +} + +static struct ptlrpc_hpreq_ops mdt_hpreq_punch = { + .hpreq_lock_match = mdt_punch_hpreq_lock_match, + .hpreq_check = mdt_punch_hpreq_check, + .hpreq_fini = mdt_punch_hpreq_fini +}; + +void mdt_hp_punch(struct tgt_session_info *tsi) +{ + LASSERT(tsi->tsi_ost_body != NULL); /* must exists if we are here */ + /* no high-priority if server lock is needed */ + if ((tsi->tsi_ost_body->oa.o_valid & OBD_MD_FLFLAGS && + tsi->tsi_ost_body->oa.o_flags & OBD_FL_SRVLOCK) || + tgt_conn_flags(tsi) & OBD_CONNECT_MDS || + lustre_msg_get_flags(tgt_ses_req(tsi)->rq_reqmsg) & MSG_REPLAY) + return; + tgt_ses_req(tsi)->rq_ops = &mdt_hpreq_punch; +} + static int mdt_preprw_read(const struct lu_env *env, struct obd_export *exp, struct mdt_device *mdt, struct mdt_object *mo, struct lu_attr *la, int niocount, @@ -69,16 +383,42 @@ static int mdt_preprw_read(const struct lu_env *env, struct obd_export *exp, { struct dt_object *dob; int i, j, rc, tot_bytes = 0; + int level; ENTRY; mdt_dom_read_lock(mo); - if (!mdt_object_exists(mo)) - GOTO(unlock, rc = -ENOENT); + *nr_local = 0; + /* the only valid case when READ can find object is missing or stale + * when export is just evicted and open files are closed forcefully + * on server while client's READ can be in progress. + * This should not happen on healthy export, object can't be missing + * or dying because both states means it was finally destroyed. + */ + level = exp->exp_failed ? D_INFO : D_ERROR; + if (!mdt_object_exists(mo)) { + CDEBUG_LIMIT(level, + "%s: READ IO to missing obj "DFID": rc = %d\n", + exp->exp_obd->obd_name, PFID(mdt_object_fid(mo)), + -ENOENT); + /* return 0 and continue with empty commit to skip such READ + * without more BRW errors. + */ + RETURN(0); + } + if (lu_object_is_dying(&mo->mot_header)) { + CDEBUG_LIMIT(level, + "%s: READ IO to stale obj "DFID": rc = %d\n", + exp->exp_obd->obd_name, PFID(mdt_object_fid(mo)), + -ESTALE); + /* return 0 and continue with empty commit to skip such READ + * without more BRW errors. + */ + RETURN(0); + } dob = mdt_obj2dt(mo); /* parse remote buffers to local buffers and prepare the latter */ - *nr_local = 0; for (i = 0, j = 0; i < niocount; i++) { rc = dt_bufs_get(env, dob, rnb + i, lnb + j, 0); if (unlikely(rc < 0)) @@ -101,7 +441,6 @@ static int mdt_preprw_read(const struct lu_env *env, struct obd_export *exp, RETURN(0); buf_put: dt_bufs_put(env, dob, lnb, *nr_local); -unlock: mdt_dom_read_unlock(mo); return rc; } @@ -123,15 +462,34 @@ static int mdt_preprw_write(const struct lu_env *env, struct obd_export *exp, tgt_grant_prepare_write(env, exp, oa, rnb, obj->ioo_bufcnt); mdt_dom_read_lock(mo); + *nr_local = 0; + /* don't report error in cases with failed export */ if (!mdt_object_exists(mo)) { - CDEBUG(D_ERROR, "%s: BRW to missing obj "DFID"\n", - exp->exp_obd->obd_name, PFID(mdt_object_fid(mo))); - GOTO(unlock, rc = -ENOENT); + int level = exp->exp_failed ? D_INFO : D_ERROR; + + rc = -ENOENT; + CDEBUG_LIMIT(level, + "%s: WRITE IO to missing obj "DFID": rc = %d\n", + exp->exp_obd->obd_name, PFID(mdt_object_fid(mo)), + rc); + /* exit with no data written, note nr_local = 0 above */ + GOTO(unlock, rc); + } + if (lu_object_is_dying(&mo->mot_header)) { + /* This is possible race between object destroy followed by + * discard BL AST and client cache flushing. Object is + * referenced until discard finish. + */ + CDEBUG(D_INODE, "WRITE IO to stale object "DFID"\n", + PFID(mdt_object_fid(mo))); + /* Note: continue with no error here to don't cause BRW errors + * but skip transaction in commitrw silently so no data is + * written. + */ } dob = mdt_obj2dt(mo); /* parse remote buffers to local buffers and prepare the latter */ - *nr_local = 0; for (i = 0, j = 0; i < obj->ioo_bufcnt; i++) { rc = dt_bufs_get(env, dob, rnb + i, lnb + j, 1); if (unlikely(rc < 0)) @@ -232,11 +590,10 @@ static int mdt_commitrw_read(const struct lu_env *env, struct mdt_device *mdt, ENTRY; - LASSERT(niocount > 0); - dob = mdt_obj2dt(mo); - dt_bufs_put(env, dob, lnb, niocount); + if (niocount) + dt_bufs_put(env, dob, lnb, niocount); mdt_dom_read_unlock(mo); RETURN(rc); @@ -266,6 +623,20 @@ static int mdt_commitrw_write(const struct lu_env *env, struct obd_export *exp, retry: if (!dt_object_exists(dob)) GOTO(out, rc = -ENOENT); + if (lu_object_is_dying(&mo->mot_header)) { + /* Commit to stale object can be just skipped silently. */ + CDEBUG(D_INODE, "skip commit to stale object "DFID"\n", + PFID(mdt_object_fid(mo))); + GOTO(out, rc = 0); + } + + if (niocount == 0) { + rc = -EPROTO; + DEBUG_REQ(D_WARNING, tgt_ses_req(tgt_ses_info(env)), + "%s: commit with no pages for "DFID": rc = %d\n", + exp->exp_obd->obd_name, PFID(mdt_object_fid(mo)), rc); + GOTO(out, rc); + } th = dt_trans_create(env, dt); if (IS_ERR(th)) @@ -292,6 +663,7 @@ retry: GOTO(out_stop, rc); } + tgt_vbr_obj_set(env, dob); rc = dt_trans_start(env, dt, th); if (rc) GOTO(out_stop, rc); @@ -370,12 +742,6 @@ int mdt_obd_commitrw(const struct lu_env *env, int cmd, struct obd_export *exp, __u64 valid; int rc = 0; - if (npages == 0) { - CERROR("%s: no pages to commit\n", - exp->exp_obd->obd_name); - rc = -EPROTO; - } - LASSERT(mo); if (cmd == OBD_BRW_WRITE) { @@ -387,7 +753,10 @@ int mdt_obd_commitrw(const struct lu_env *env, int cmd, struct obd_export *exp, * doesn't already exist so we can store the reservation handle * there. */ valid = OBD_MD_FLUID | OBD_MD_FLGID; - valid |= OBD_MD_FLATIME | OBD_MD_FLMTIME | OBD_MD_FLCTIME; + if (tgt_fmd_check(exp, mdt_object_fid(mo), + mdt_info_req(info)->rq_xid)) + valid |= OBD_MD_FLATIME | OBD_MD_FLMTIME | + OBD_MD_FLCTIME; la_from_obdo(la, oa, valid); @@ -417,8 +786,15 @@ int mdt_obd_commitrw(const struct lu_env *env, int cmd, struct obd_export *exp, oa->o_flags = OBD_FL_NO_GRPQUOTA; } + if (lnb[0].lnb_flags & OBD_BRW_OVER_PRJQUOTA) { + if (oa->o_valid & OBD_MD_FLFLAGS) + oa->o_flags |= OBD_FL_NO_PRJQUOTA; + else + oa->o_flags = OBD_FL_NO_PRJQUOTA; + } + oa->o_valid |= OBD_MD_FLFLAGS | OBD_MD_FLUSRQUOTA | - OBD_MD_FLGRPQUOTA; + OBD_MD_FLGRPQUOTA | OBD_MD_FLPRJQUOTA; } } else if (cmd == OBD_BRW_READ) { /* If oa != NULL then mdt_preprw_read updated the inode @@ -432,7 +808,6 @@ int mdt_obd_commitrw(const struct lu_env *env, int cmd, struct obd_export *exp, } else { rc = -EPROTO; } - /* this put is pair to object_get in ofd_preprw_write */ mdt_thread_info_fini(info); RETURN(rc); } @@ -550,15 +925,29 @@ int mdt_punch_hdl(struct tgt_session_info *tsi) if (IS_ERR(mo)) GOTO(out_unlock, rc = PTR_ERR(mo)); - mdt_dom_write_lock(mo); if (!mdt_object_exists(mo)) GOTO(out_put, rc = -ENOENT); + + /* Shouldn't happen on dirs */ + if (S_ISDIR(lu_object_attr(&mo->mot_obj))) { + rc = -EPERM; + CERROR("%s: Truncate on dir "DFID": rc = %d\n", + exp->exp_obd->obd_name, PFID(&tsi->tsi_fid), rc); + GOTO(out_put, rc); + } + + mdt_dom_write_lock(mo); dob = mdt_obj2dt(mo); la_from_obdo(la, oa, OBD_MD_FLMTIME | OBD_MD_FLATIME | OBD_MD_FLCTIME); la->la_size = start; la->la_valid |= LA_SIZE; + /* MDT supports FMD for Data-on-MDT needs */ + if (la->la_valid & (LA_ATIME | LA_MTIME | LA_CTIME)) + tgt_fmd_update(tsi->tsi_exp, &tsi->tsi_fid, + tgt_ses_req(tsi)->rq_xid); + rc = mdt_object_punch(tsi->tsi_env, mdt->mdt_bottom, dob, start, end, la); mdt_dom_write_unlock(mo); @@ -573,7 +962,7 @@ out_put: lu_object_put(tsi->tsi_env, &mo->mot_obj); out_unlock: if (srvlock) - mdt_save_lock(info, &lh, LCK_PW, rc); + tgt_extent_unlock(&lh, LCK_PW); out: mdt_thread_info_fini(info); return rc; @@ -601,7 +990,7 @@ int mdt_do_glimpse(const struct lu_env *env, struct ldlm_namespace *ns, /* There can be only one write lock covering data, try to match it. */ policy.l_inodebits.bits = MDS_INODELOCK_DOM; - mode = ldlm_lock_match(ns, LDLM_FL_BLOCK_GRANTED | LDLM_FL_TEST_LOCK, + mode = ldlm_lock_match(ns, LDLM_FL_TEST_LOCK, &res->lr_name, LDLM_IBITS, &policy, LCK_PW, &lockh, 0); @@ -763,7 +1152,7 @@ int mdt_glimpse_enqueue(struct mdt_thread_info *mti, struct ldlm_namespace *ns, if (flags & LDLM_FL_RESENT) { rc = LDLM_ITER_CONTINUE; } else { - __u64 tmpflags = 0; + __u64 tmpflags = LDLM_FL_BLOCK_NOWAIT; enum ldlm_error err; rc = policy(lock, &tmpflags, LDLM_PROCESS_RESCAN, &err, NULL); @@ -885,32 +1274,6 @@ out: RETURN(rc); } -void mdt_dom_discard_data(struct mdt_thread_info *info, - const struct lu_fid *fid) -{ - struct mdt_device *mdt = info->mti_mdt; - union ldlm_policy_data *policy = &info->mti_policy; - struct ldlm_res_id *res_id = &info->mti_res_id; - struct lustre_handle dom_lh; - __u64 flags = LDLM_FL_AST_DISCARD_DATA; - int rc = 0; - - policy->l_inodebits.bits = MDS_INODELOCK_DOM; - policy->l_inodebits.try_bits = 0; - fid_build_reg_res_name(fid, res_id); - - /* Tell the clients that the object is gone now and that they should - * throw away any cached pages. */ - rc = ldlm_cli_enqueue_local(mdt->mdt_namespace, res_id, LDLM_IBITS, - policy, LCK_PW, &flags, ldlm_blocking_ast, - ldlm_completion_ast, NULL, NULL, 0, - LVB_T_NONE, NULL, &dom_lh); - - /* We only care about the side-effects, just drop the lock. */ - if (rc == ELDLM_OK) - ldlm_lock_decref(&dom_lh, LCK_PW); -} - /* check if client has already DoM lock for given resource */ bool mdt_dom_client_has_lock(struct mdt_thread_info *info, const struct lu_fid *fid) @@ -945,3 +1308,394 @@ bool mdt_dom_client_has_lock(struct mdt_thread_info *info, return rc; } +/** + * MDT request handler for OST_GETATTR RPC. + * + * This is data-specific request to get object and layout versions under + * IO lock. It is reliable only for Data-on-MDT files. + * + * \param[in] tsi target session environment for this request + * + * \retval 0 if successful + * \retval negative value on error + */ +int mdt_data_version_get(struct tgt_session_info *tsi) +{ + struct mdt_thread_info *mti = mdt_th_info(tsi->tsi_env); + struct mdt_device *mdt = mti->mti_mdt; + struct mdt_body *repbody; + struct mdt_object *mo = mti->mti_object; + struct lov_comp_md_v1 *comp; + struct lustre_handle lh = { 0 }; + __u64 flags = 0; + __s64 version; + enum ldlm_mode lock_mode = LCK_PR; + bool srvlock; + int rc; + + ENTRY; + + req_capsule_set_size(tsi->tsi_pill, &RMF_MDT_MD, RCL_SERVER, 0); + req_capsule_set_size(tsi->tsi_pill, &RMF_ACL, RCL_SERVER, 0); + rc = req_capsule_server_pack(tsi->tsi_pill); + if (unlikely(rc != 0)) + RETURN(err_serious(rc)); + + repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_MDT_BODY); + if (repbody == NULL) + RETURN(-ENOMEM); + + srvlock = tsi->tsi_mdt_body->mbo_valid & OBD_MD_FLFLAGS && + tsi->tsi_mdt_body->mbo_flags & OBD_FL_SRVLOCK; + + if (srvlock) { + if (unlikely(tsi->tsi_mdt_body->mbo_flags & OBD_FL_FLUSH)) + lock_mode = LCK_PW; + + fid_build_reg_res_name(&tsi->tsi_fid, &tsi->tsi_resid); + rc = tgt_mdt_data_lock(mdt->mdt_namespace, &tsi->tsi_resid, + &lh, lock_mode, &flags); + if (rc != 0) + RETURN(rc); + } + + if (!mdt_object_exists(mo)) + GOTO(out, rc = -ENOENT); + if (mdt_object_remote(mo)) + GOTO(out, rc = -EREMOTE); + if (!S_ISREG(lu_object_attr(&mo->mot_obj))) + GOTO(out, rc = -EBADF); + + /* Get version first */ + version = dt_version_get(tsi->tsi_env, mdt_obj2dt(mo)); + if (version && version != -EOPNOTSUPP) { + repbody->mbo_valid |= OBD_MD_FLDATAVERSION; + /* re-use mbo_ioepoch to transfer version */ + repbody->mbo_version = version; + } + + /* Read layout to get its version */ + rc = mdt_big_xattr_get(mti, mo, XATTR_NAME_LOV); + if (rc == -ENODATA) /* File has no layout yet */ + GOTO(out, rc = 0); + else if (rc < 0) + GOTO(out, rc); + + comp = mti->mti_buf.lb_buf; + if (le32_to_cpu(comp->lcm_magic) != LOV_MAGIC_COMP_V1) { + CDEBUG(D_INFO, DFID" has no composite layout", + PFID(&tsi->tsi_fid)); + GOTO(out, rc = -ESTALE); + } + + CDEBUG(D_INODE, DFID": layout version: %u\n", + PFID(&tsi->tsi_fid), le32_to_cpu(comp->lcm_layout_gen)); + + repbody->mbo_valid |= OBD_MD_LAYOUT_VERSION; + /* re-use mbo_rdev for that */ + repbody->mbo_layout_gen = le32_to_cpu(comp->lcm_layout_gen); + rc = 0; +out: + if (srvlock) + tgt_mdt_data_unlock(&lh, lock_mode); + + repbody->mbo_valid |= OBD_MD_FLFLAGS; + repbody->mbo_flags = OBD_FL_FLUSH; + RETURN(rc); +} + +/* read file data to the buffer */ +int mdt_dom_read_on_open(struct mdt_thread_info *mti, struct mdt_device *mdt, + struct lustre_handle *lh) +{ + const struct lu_env *env = mti->mti_env; + struct tgt_session_info *tsi = tgt_ses_info(env); + struct req_capsule *pill = tsi->tsi_pill; + const struct lu_fid *fid; + struct ptlrpc_request *req = tgt_ses_req(tsi); + struct mdt_body *mbo; + struct dt_device *dt = mdt->mdt_bottom; + struct dt_object *mo; + void *buf; + struct niobuf_remote *rnb = NULL; + struct niobuf_local *lnb; + int rc; + loff_t offset; + unsigned int len, copied = 0; + int lnbs, nr_local, i; + bool dom_lock = false; + + ENTRY; + + if (!req_capsule_field_present(pill, &RMF_NIOBUF_INLINE, RCL_SERVER)) { + /* There is no reply buffers for this field, this means that + * client has no support for data in reply. + */ + RETURN(0); + } + + mbo = req_capsule_server_get(pill, &RMF_MDT_BODY); + + if (lustre_handle_is_used(lh)) { + struct ldlm_lock *lock; + + lock = ldlm_handle2lock(lh); + if (lock) { + dom_lock = ldlm_has_dom(lock) && ldlm_has_layout(lock); + LDLM_LOCK_PUT(lock); + } + } + + /* return data along with open only along with DoM lock */ + if (!dom_lock || !mdt->mdt_opts.mo_dom_read_open) + RETURN(0); + + if (!(mbo->mbo_valid & OBD_MD_DOM_SIZE)) + RETURN(0); + + if (mbo->mbo_dom_size == 0) + RETURN(0); + + CDEBUG(D_INFO, "File size %llu, reply sizes %d/%d\n", + mbo->mbo_dom_size, req->rq_reqmsg->lm_repsize, req->rq_replen); + len = req->rq_reqmsg->lm_repsize - req->rq_replen; + + /* NB: at this moment we have the following sizes: + * - req->rq_replen: used data in reply + * - req->rq_reqmsg->lm_repsize: total allocated reply buffer at client + * + * Ideal case when file size fits in allocated reply buffer, + * that mean we can return whole data in reply. We can also fit more + * data up to max_reply_size in total reply size, but this will cause + * re-allocation on client and resend with larger buffer. This is still + * faster than separate READ IO. + * Third case if file is too big to fit even in maximum size, in that + * case we return just tail to optimize possible append. + * + * At the moment the following strategy is used: + * 1) try to fit into the buffer we have + * 2) return just file tail otherwise. + */ + if (mbo->mbo_dom_size <= len) { + /* can fit whole data */ + len = mbo->mbo_dom_size; + offset = 0; + } else { + int tail, pgbits; + + /* File tail offset must be aligned with larger page size + * between client and server, so the maximum page size is + * used here to align offset. + * + * NB: DOM feature was introduced when server supports pagebits + * already, so it should be always non-zero value. Report error + * if it is not for some reason. + */ + if (!req->rq_export->exp_target_data.ted_pagebits) { + CERROR("%s: client page bits are not saved on server\n", + mdt_obd_name(mdt)); + RETURN(0); + } + pgbits = max_t(int, PAGE_SHIFT, + req->rq_export->exp_target_data.ted_pagebits); + tail = mbo->mbo_dom_size % (1 << pgbits); + + /* no partial tail or tail can't fit in reply */ + if (tail == 0 || len < tail) + RETURN(0); + + len = tail; + offset = mbo->mbo_dom_size - len; + } + LASSERT((offset % PAGE_SIZE) == 0); + rc = req_capsule_server_grow(pill, &RMF_NIOBUF_INLINE, + sizeof(*rnb) + len); + if (rc != 0) { + /* failed to grow data buffer, just exit */ + GOTO(out, rc = -E2BIG); + } + + /* re-take MDT_BODY and NIOBUF_INLINE buffers after the buffer grow */ + mbo = req_capsule_server_get(pill, &RMF_MDT_BODY); + fid = &mbo->mbo_fid1; + if (!fid_is_sane(fid)) + GOTO(out, rc = -EINVAL); + + rnb = req_capsule_server_get(tsi->tsi_pill, &RMF_NIOBUF_INLINE); + if (rnb == NULL) + GOTO(out, rc = -EPROTO); + + buf = (char *)rnb + sizeof(*rnb); + rnb->rnb_len = len; + rnb->rnb_offset = offset; + + mo = dt_locate(env, dt, fid); + if (IS_ERR(mo)) + GOTO(out_rnb, rc = PTR_ERR(mo)); + LASSERT(mo != NULL); + + dt_read_lock(env, mo, 0); + if (!dt_object_exists(mo)) + GOTO(unlock, rc = -ENOENT); + + /* parse remote buffers to local buffers and prepare the latter */ + lnbs = (len >> PAGE_SHIFT) + 1; + OBD_ALLOC(lnb, sizeof(*lnb) * lnbs); + if (lnb == NULL) + GOTO(unlock, rc = -ENOMEM); + + rc = dt_bufs_get(env, mo, rnb, lnb, 0); + if (unlikely(rc < 0)) + GOTO(free, rc); + LASSERT(rc <= lnbs); + nr_local = rc; + rc = dt_read_prep(env, mo, lnb, nr_local); + if (unlikely(rc)) + GOTO(buf_put, rc); + /* copy data to the buffer finally */ + for (i = 0; i < nr_local; i++) { + char *p = kmap(lnb[i].lnb_page); + long off; + + LASSERT(lnb[i].lnb_page_offset == 0); + off = lnb[i].lnb_len & ~PAGE_MASK; + if (off > 0) + memset(p + off, 0, PAGE_SIZE - off); + + memcpy(buf + (i << PAGE_SHIFT), p, lnb[i].lnb_len); + kunmap(lnb[i].lnb_page); + copied += lnb[i].lnb_len; + LASSERT(rc <= len); + } + CDEBUG(D_INFO, "Read %i (wanted %u) bytes from %llu\n", copied, + len, offset); + if (copied < len) { + CWARN("%s: read %i bytes for "DFID + " but wanted %u, is size wrong?\n", + tsi->tsi_exp->exp_obd->obd_name, copied, + PFID(&tsi->tsi_fid), len); + /* Ignore partially copied data */ + copied = 0; + } + EXIT; +buf_put: + dt_bufs_put(env, mo, lnb, nr_local); +free: + OBD_FREE(lnb, sizeof(*lnb) * lnbs); +unlock: + dt_read_unlock(env, mo); + lu_object_put(env, &mo->do_lu); +out_rnb: + rnb->rnb_len = copied; +out: + /* Don't fail OPEN request if read-on-open is failed, but drop + * a message in log about the error. + */ + if (rc) + CDEBUG(D_INFO, "Read-on-open is failed, rc = %d", rc); + + RETURN(0); +} + +/** + * Completion AST for DOM discard locks: + * + * CP AST an DOM discard lock is called always right after enqueue or from + * reprocess if lock was blocked, in the latest case l_ast_data is set to + * the mdt_object which is kept while there are pending locks on it. + */ +int ldlm_dom_discard_cp_ast(struct ldlm_lock *lock, __u64 flags, void *data) +{ + struct mdt_object *mo; + struct lustre_handle dom_lh; + struct lu_env *env; + + ENTRY; + + /* l_ast_data is set when lock was not granted immediately + * in mdt_dom_discard_data() below but put into waiting list, + * so this CP callback means we are finished and corresponding + * MDT object should be released finally as well as lock itself. + */ + lock_res_and_lock(lock); + if (!lock->l_ast_data) { + unlock_res_and_lock(lock); + RETURN(0); + } + + mo = lock->l_ast_data; + lock->l_ast_data = NULL; + unlock_res_and_lock(lock); + + ldlm_lock2handle(lock, &dom_lh); + ldlm_lock_decref(&dom_lh, LCK_PW); + + env = lu_env_find(); + LASSERT(env); + mdt_object_put(env, mo); + + RETURN(0); +} + +void mdt_dom_discard_data(struct mdt_thread_info *info, + struct mdt_object *mo) +{ + struct ptlrpc_request *req = mdt_info_req(info); + struct mdt_device *mdt = mdt_dev(mo->mot_obj.lo_dev); + union ldlm_policy_data policy; + struct ldlm_res_id res_id; + struct lustre_handle dom_lh; + struct ldlm_lock *lock; + __u64 flags = LDLM_FL_AST_DISCARD_DATA; + int rc = 0; + bool old_client; + + ENTRY; + + if (req && req_is_replay(req)) + RETURN_EXIT; + + policy.l_inodebits.bits = MDS_INODELOCK_DOM; + policy.l_inodebits.try_bits = 0; + fid_build_reg_res_name(mdt_object_fid(mo), &res_id); + + /* Keep blocking version of discard for an old client to avoid + * crashes on non-patched clients. LU-11359. + */ + old_client = req && !(exp_connect_flags2(req->rq_export) & + OBD_CONNECT2_ASYNC_DISCARD); + + /* Tell the clients that the object is gone now and that they should + * throw away any cached pages. */ + rc = ldlm_cli_enqueue_local(info->mti_env, mdt->mdt_namespace, &res_id, + LDLM_IBITS, &policy, LCK_PW, &flags, + ldlm_blocking_ast, old_client ? + ldlm_completion_ast : + ldlm_dom_discard_cp_ast, + NULL, NULL, 0, LVB_T_NONE, NULL, &dom_lh); + if (rc != ELDLM_OK) { + CDEBUG(D_DLMTRACE, + "Failed to issue discard lock, rc = %d\n", rc); + RETURN_EXIT; + } + + lock = ldlm_handle2lock(&dom_lh); + lock_res_and_lock(lock); + /* if lock is not granted then there are BL ASTs in progress and + * lock will be granted in result of reprocessing with CP callback + * notifying about that. The mdt object has to be kept until that and + * it is saved in l_ast_data of the lock. Lock reference is kept too + * until that to prevent it from canceling. + */ + if (!is_granted_or_cancelled_nolock(lock)) { + mdt_object_get(info->mti_env, mo); + lock->l_ast_data = mo; + unlock_res_and_lock(lock); + } else { + unlock_res_and_lock(lock); + ldlm_lock_decref_and_cancel(&dom_lh, LCK_PW); + } + LDLM_LOCK_PUT(lock); + + RETURN_EXIT; +}