--- /dev/null
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2012, Intel, Inc.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lustre/osp/osp_sync.c
+ *
+ * Lustre OST Proxy Device
+ *
+ * Author: Alex Zhuravlev <alexey.zhuravlev@intel.com>
+ * Author: Mikhail Pershin <mike.pershin@intel.com>
+ */
+
+#ifndef EXPORT_SYMTAB
+# define EXPORT_SYMTAB
+#endif
+#define DEBUG_SUBSYSTEM S_MDS
+
+#include <lustre_log.h>
+#include "osp_internal.h"
+
+static int osp_sync_id_traction_init(struct osp_device *d);
+static void osp_sync_id_traction_fini(struct osp_device *d);
+static __u32 osp_sync_id_get(struct osp_device *d, __u32 id);
+static void osp_sync_remove_from_tracker(struct osp_device *d);
+
+/*
+ * this is a components of OSP implementing synchronization between MDS and OST
+ * it llogs all interesting changes (currently it's uig/gid change and object
+ * destroy) atomically, then makes sure changes hit OST storage
+ *
+ * we have 4 queues of work:
+ *
+ * the first queue is llog itself, once read a change is stored in 2nd queue
+ * in form of RPC (but RPC isn't fired yet).
+ *
+ * the second queue (opd_syn_waiting_for_commit) holds changes awaiting local
+ * commit. once change is committed locally it migrates onto 3rd queue.
+ *
+ * the third queue (opd_syn_committed_here) holds changes committed locally,
+ * but not sent to OST (as the pipe can be full). once pipe becomes non-full
+ * we take a change from the queue and fire corresponded RPC.
+ *
+ * once RPC is reported committed by OST (using regular last_committed mech.)
+ * the change jumps into 4th queue (opd_syn_committed_there), now we can
+ * cancel corresponded llog record and release RPC
+ *
+ * opd_syn_changes is a number of unread llog records (to be processed).
+ * notice this number doesn't include llog records from previous boots.
+ * with OSP_SYN_THRESHOLD we try to batch processing a bit (TO BE IMPLEMENTED)
+ *
+ * opd_syn_rpc_in_progress is a number of requests in 2-4 queues.
+ * we control this with OSP_MAX_IN_PROGRESS so that OSP don't consume
+ * too much memory -- how to deal with 1000th OSTs ? batching could help?
+ *
+ * opd_syn_rpc_in_flight is a number of RPC in flight.
+ * we control this with OSP_MAX_IN_FLIGHT
+ */
+
+/* XXX: do math to learn reasonable threshold
+ * should it be ~ number of changes fitting bulk? */
+
+#define OSP_SYN_THRESHOLD 10
+#define OSP_MAX_IN_FLIGHT 8
+#define OSP_MAX_IN_PROGRESS 4096
+
+#define OSP_JOB_MAGIC 0x26112005
+
+static inline int osp_sync_running(struct osp_device *d)
+{
+ return !!(d->opd_syn_thread.t_flags & SVC_RUNNING);
+}
+
+static inline int osp_sync_stopped(struct osp_device *d)
+{
+ return !!(d->opd_syn_thread.t_flags & SVC_STOPPED);
+}
+
+static inline int osp_sync_has_new_job(struct osp_device *d)
+{
+ return ((d->opd_syn_last_processed_id < d->opd_syn_last_used_id) &&
+ (d->opd_syn_last_processed_id < d->opd_syn_last_committed_id))
+ || (d->opd_syn_prev_done == 0);
+}
+
+static inline int osp_sync_low_in_progress(struct osp_device *d)
+{
+ return d->opd_syn_rpc_in_progress < d->opd_syn_max_rpc_in_progress;
+}
+
+static inline int osp_sync_low_in_flight(struct osp_device *d)
+{
+ return d->opd_syn_rpc_in_flight < d->opd_syn_max_rpc_in_flight;
+}
+
+static inline int osp_sync_has_work(struct osp_device *d)
+{
+ /* has new/old changes and low in-progress? */
+ if (osp_sync_has_new_job(d) && osp_sync_low_in_progress(d) &&
+ osp_sync_low_in_flight(d) && d->opd_imp_connected)
+ return 1;
+
+ /* has remotely committed? */
+ if (!cfs_list_empty(&d->opd_syn_committed_there))
+ return 1;
+
+ return 0;
+}
+
+#define osp_sync_check_for_work(d) \
+{ \
+ if (osp_sync_has_work(d)) { \
+ cfs_waitq_signal(&d->opd_syn_waitq); \
+ } \
+}
+
+void __osp_sync_check_for_work(struct osp_device *d)
+{
+ osp_sync_check_for_work(d);
+}
+
+static inline int osp_sync_can_process_new(struct osp_device *d,
+ struct llog_rec_hdr *rec)
+{
+ LASSERT(d);
+
+ if (!osp_sync_low_in_progress(d))
+ return 0;
+ if (!osp_sync_low_in_flight(d))
+ return 0;
+ if (!d->opd_imp_connected)
+ return 0;
+ if (d->opd_syn_prev_done == 0)
+ return 1;
+ if (d->opd_syn_changes == 0)
+ return 0;
+ if (rec == NULL || rec->lrh_id <= d->opd_syn_last_committed_id)
+ return 1;
+ return 0;
+}
+
+int osp_sync_declare_add(const struct lu_env *env, struct osp_object *o,
+ llog_op_type type, struct thandle *th)
+{
+ struct osp_thread_info *osi = osp_env_info(env);
+ struct osp_device *d = lu2osp_dev(o->opo_obj.do_lu.lo_dev);
+ struct llog_ctxt *ctxt;
+ int rc;
+
+ ENTRY;
+
+ /* it's a layering violation, to access internals of th,
+ * but we can do this as a sanity check, for a while */
+ LASSERT(th->th_dev == d->opd_storage);
+
+ switch (type) {
+ case MDS_UNLINK64_REC:
+ osi->osi_hdr.lrh_len = sizeof(struct llog_unlink64_rec);
+ break;
+ case MDS_SETATTR64_REC:
+ osi->osi_hdr.lrh_len = sizeof(struct llog_setattr64_rec);
+ break;
+ default:
+ LBUG();
+ }
+
+ /* we want ->dt_trans_start() to allocate per-thandle structure */
+ th->th_tags |= LCT_OSP_THREAD;
+
+ ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
+ LASSERT(ctxt);
+
+ rc = llog_declare_add(env, ctxt->loc_handle, &osi->osi_hdr, th);
+ llog_ctxt_put(ctxt);
+
+ RETURN(rc);
+}
+
+static int osp_sync_add_rec(const struct lu_env *env, struct osp_device *d,
+ const struct lu_fid *fid, llog_op_type type,
+ int count, struct thandle *th,
+ const struct lu_attr *attr)
+{
+ struct osp_thread_info *osi = osp_env_info(env);
+ struct llog_ctxt *ctxt;
+ struct osp_txn_info *txn;
+ int rc;
+
+ ENTRY;
+
+ /* it's a layering violation, to access internals of th,
+ * but we can do this as a sanity check, for a while */
+ LASSERT(th->th_dev == d->opd_storage);
+
+ switch (type) {
+ case MDS_UNLINK64_REC:
+ osi->osi_hdr.lrh_len = sizeof(osi->osi_unlink);
+ osi->osi_hdr.lrh_type = MDS_UNLINK64_REC;
+ osi->osi_unlink.lur_fid = *fid;
+ osi->osi_unlink.lur_count = count;
+ break;
+ case MDS_SETATTR64_REC:
+ rc = fid_ostid_pack(fid, &osi->osi_oi);
+ LASSERT(rc == 0);
+ osi->osi_hdr.lrh_len = sizeof(osi->osi_setattr);
+ osi->osi_hdr.lrh_type = MDS_SETATTR64_REC;
+ osi->osi_setattr.lsr_oid = osi->osi_oi.oi_id;
+ osi->osi_setattr.lsr_oseq = osi->osi_oi.oi_seq;
+ LASSERT(attr);
+ osi->osi_setattr.lsr_uid = attr->la_uid;
+ osi->osi_setattr.lsr_gid = attr->la_gid;
+ break;
+ default:
+ LBUG();
+ }
+
+ txn = osp_txn_info(&th->th_ctx);
+ LASSERT(txn);
+
+ txn->oti_current_id = osp_sync_id_get(d, txn->oti_current_id);
+ osi->osi_hdr.lrh_id = txn->oti_current_id;
+
+ ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
+ if (ctxt == NULL)
+ RETURN(-ENOMEM);
+ rc = llog_add(env, ctxt->loc_handle, &osi->osi_hdr, &osi->osi_cookie,
+ NULL, th);
+ llog_ctxt_put(ctxt);
+
+ CDEBUG(D_OTHER, "%s: new record %lu:%lu:%lu/%lu: %d\n",
+ d->opd_obd->obd_name,
+ (unsigned long) osi->osi_cookie.lgc_lgl.lgl_oid,
+ (unsigned long) osi->osi_cookie.lgc_lgl.lgl_oseq,
+ (unsigned long) osi->osi_cookie.lgc_lgl.lgl_ogen,
+ (unsigned long) osi->osi_cookie.lgc_index, rc);
+
+ if (rc > 0)
+ rc = 0;
+
+ if (likely(rc == 0)) {
+ cfs_spin_lock(&d->opd_syn_lock);
+ d->opd_syn_changes++;
+ cfs_spin_unlock(&d->opd_syn_lock);
+ }
+
+ RETURN(rc);
+}
+
+int osp_sync_add(const struct lu_env *env, struct osp_object *o,
+ llog_op_type type, struct thandle *th,
+ const struct lu_attr *attr)
+{
+ return osp_sync_add_rec(env, lu2osp_dev(o->opo_obj.do_lu.lo_dev),
+ lu_object_fid(&o->opo_obj.do_lu), type, 1,
+ th, attr);
+}
+
+int osp_sync_gap(const struct lu_env *env, struct osp_device *d,
+ struct lu_fid *fid, int lost, struct thandle *th)
+{
+ return osp_sync_add_rec(env, d, fid, MDS_UNLINK64_REC, lost, th, NULL);
+}
+
+/*
+ * it's quite obvious we can't maintain all the structures in the memory:
+ * while OST is down, MDS can be processing thousands and thousands of unlinks
+ * filling persistent llogs and in-core respresentation
+ *
+ * this doesn't scale at all. so we need basically the following:
+ * a) destroy/setattr append llog records
+ * b) once llog has grown to X records, we process first Y committed records
+ *
+ * once record R is found via llog_process(), it becomes committed after any
+ * subsequent commit callback (at the most)
+ */
+
+/*
+ * called for each atomic on-disk change (not once per transaction batch)
+ * and goes over the list
+ * XXX: should be optimized?
+ */
+
+/**
+ * called for each RPC reported committed
+ */
+static void osp_sync_request_commit_cb(struct ptlrpc_request *req)
+{
+ struct osp_device *d = req->rq_cb_data;
+
+ CDEBUG(D_HA, "commit req %p, transno "LPU64"\n", req, req->rq_transno);
+
+ if (unlikely(req->rq_transno == 0))
+ return;
+
+ /* XXX: what if request isn't committed for very long? */
+ LASSERT(d);
+ LASSERT(req->rq_svc_thread == (void *) OSP_JOB_MAGIC);
+ LASSERT(cfs_list_empty(&req->rq_exp_list));
+
+ ptlrpc_request_addref(req);
+
+ cfs_spin_lock(&d->opd_syn_lock);
+ cfs_list_add(&req->rq_exp_list, &d->opd_syn_committed_there);
+ cfs_spin_unlock(&d->opd_syn_lock);
+
+ /* XXX: some batching wouldn't hurt */
+ cfs_waitq_signal(&d->opd_syn_waitq);
+}
+
+static int osp_sync_interpret(const struct lu_env *env,
+ struct ptlrpc_request *req, void *aa, int rc)
+{
+ struct osp_device *d = req->rq_cb_data;
+
+ /* XXX: error handling here */
+ if (req->rq_svc_thread != (void *) OSP_JOB_MAGIC)
+ DEBUG_REQ(D_ERROR, req, "bad magic %p\n", req->rq_svc_thread);
+ LASSERT(req->rq_svc_thread == (void *) OSP_JOB_MAGIC);
+ LASSERT(d);
+
+ CDEBUG(D_HA, "reply req %p/%d, rc %d, transno %u\n", req,
+ cfs_atomic_read(&req->rq_refcount),
+ rc, (unsigned) req->rq_transno);
+ LASSERT(rc || req->rq_transno);
+
+ if (rc == -ENOENT) {
+ /*
+ * we tried to destroy object or update attributes,
+ * but object doesn't exist anymore - cancell llog record
+ */
+ LASSERT(req->rq_transno == 0);
+ LASSERT(cfs_list_empty(&req->rq_exp_list));
+
+ ptlrpc_request_addref(req);
+
+ cfs_spin_lock(&d->opd_syn_lock);
+ cfs_list_add(&req->rq_exp_list, &d->opd_syn_committed_there);
+ cfs_spin_unlock(&d->opd_syn_lock);
+
+ cfs_waitq_signal(&d->opd_syn_waitq);
+ } else if (rc) {
+ struct obd_import *imp = req->rq_import;
+ /*
+ * error happened, we'll try to repeat on next boot ?
+ */
+ LASSERTF(req->rq_transno == 0 ||
+ req->rq_import_generation < imp->imp_generation,
+ "transno "LPU64", rc %d, gen: req %d, imp %d\n",
+ req->rq_transno, rc, req->rq_import_generation,
+ imp->imp_generation);
+ LASSERT(d->opd_syn_rpc_in_progress > 0);
+ if (req->rq_transno == 0) {
+ /* this is the last time we see the request
+ * if transno is not zero, then commit cb
+ * will be called at some point */
+ cfs_spin_lock(&d->opd_syn_lock);
+ d->opd_syn_rpc_in_progress--;
+ cfs_spin_unlock(&d->opd_syn_lock);
+ }
+
+ cfs_waitq_signal(&d->opd_syn_waitq);
+ } else if (unlikely(d->opd_pre_status == -ENOSPC)) {
+ /*
+ * if current status is -ENOSPC (lack of free space on OST)
+ * then we should poll OST immediately once object destroy
+ * is replied
+ */
+ osp_statfs_need_now(d);
+ }
+
+ LASSERT(d->opd_syn_rpc_in_flight > 0);
+ cfs_spin_lock(&d->opd_syn_lock);
+ d->opd_syn_rpc_in_flight--;
+ cfs_spin_unlock(&d->opd_syn_lock);
+ CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
+ d->opd_obd->obd_name, d->opd_syn_rpc_in_flight,
+ d->opd_syn_rpc_in_progress);
+
+ osp_sync_check_for_work(d);
+
+ return 0;
+}
+
+/*
+ * the function walks through list of committed locally changes
+ * and send them to RPC until the pipe is full
+ */
+static void osp_sync_send_new_rpc(struct osp_device *d,
+ struct ptlrpc_request *req)
+{
+ LASSERT(d->opd_syn_rpc_in_flight <= d->opd_syn_max_rpc_in_flight);
+ LASSERT(req->rq_svc_thread == (void *) OSP_JOB_MAGIC);
+
+ ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
+}
+
+static struct ptlrpc_request *osp_sync_new_job(struct osp_device *d,
+ struct llog_handle *llh,
+ struct llog_rec_hdr *h,
+ ost_cmd_t op,
+ const struct req_format *format)
+{
+ struct ptlrpc_request *req;
+ struct ost_body *body;
+ struct obd_import *imp;
+ int rc;
+
+ /* Prepare the request */
+ imp = d->opd_obd->u.cli.cl_import;
+ LASSERT(imp);
+ req = ptlrpc_request_alloc(imp, format);
+ if (req == NULL)
+ RETURN(ERR_PTR(-ENOMEM));
+
+ rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, op);
+ if (rc) {
+ ptlrpc_req_finished(req);
+ return ERR_PTR(rc);
+ }
+
+ /*
+ * this is a trick: to save on memory allocations we put cookie
+ * into the request, but don't set corresponded flag in o_valid
+ * so that OST doesn't interpret this cookie. once the request
+ * is committed on OST we take cookie from the request and cancel
+ */
+ body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
+ LASSERT(body);
+ body->oa.o_lcookie.lgc_lgl = llh->lgh_id;
+ body->oa.o_lcookie.lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
+ body->oa.o_lcookie.lgc_index = h->lrh_index;
+ CFS_INIT_LIST_HEAD(&req->rq_exp_list);
+ req->rq_svc_thread = (void *) OSP_JOB_MAGIC;
+
+ req->rq_interpret_reply = osp_sync_interpret;
+ req->rq_commit_cb = osp_sync_request_commit_cb;
+ req->rq_cb_data = d;
+
+ ptlrpc_request_set_replen(req);
+
+ return req;
+}
+
+static int osp_sync_new_setattr_job(struct osp_device *d,
+ struct llog_handle *llh,
+ struct llog_rec_hdr *h)
+{
+ struct llog_setattr64_rec *rec = (struct llog_setattr64_rec *)h;
+ struct ptlrpc_request *req;
+ struct ost_body *body;
+
+ ENTRY;
+ LASSERT(h->lrh_type == MDS_SETATTR64_REC);
+
+ req = osp_sync_new_job(d, llh, h, OST_SETATTR, &RQF_OST_SETATTR);
+ if (IS_ERR(req))
+ RETURN(PTR_ERR(req));
+
+ body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
+ LASSERT(body);
+ body->oa.o_id = rec->lsr_oid;
+ body->oa.o_seq = rec->lsr_oseq;
+ body->oa.o_uid = rec->lsr_uid;
+ body->oa.o_gid = rec->lsr_gid;
+ body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID |
+ OBD_MD_FLUID | OBD_MD_FLGID;
+
+ osp_sync_send_new_rpc(d, req);
+ RETURN(0);
+}
+
+/* Old records may be in old format, so we handle that too */
+static int osp_sync_new_unlink_job(struct osp_device *d,
+ struct llog_handle *llh,
+ struct llog_rec_hdr *h)
+{
+ struct llog_unlink_rec *rec = (struct llog_unlink_rec *)h;
+ struct ptlrpc_request *req;
+ struct ost_body *body;
+
+ ENTRY;
+ LASSERT(h->lrh_type == MDS_UNLINK_REC);
+
+ req = osp_sync_new_job(d, llh, h, OST_DESTROY, &RQF_OST_DESTROY);
+ if (IS_ERR(req))
+ RETURN(PTR_ERR(req));
+
+ body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
+ LASSERT(body);
+ body->oa.o_id = rec->lur_oid;
+ body->oa.o_seq = rec->lur_oseq;
+ body->oa.o_misc = rec->lur_count;
+ body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID;
+ if (rec->lur_count)
+ body->oa.o_valid |= OBD_MD_FLOBJCOUNT;
+
+ osp_sync_send_new_rpc(d, req);
+ RETURN(0);
+}
+
+static int osp_sync_new_unlink64_job(struct osp_device *d,
+ struct llog_handle *llh,
+ struct llog_rec_hdr *h)
+{
+ struct llog_unlink64_rec *rec = (struct llog_unlink64_rec *)h;
+ struct ptlrpc_request *req;
+ struct ost_body *body;
+ int rc;
+
+ ENTRY;
+ LASSERT(h->lrh_type == MDS_UNLINK64_REC);
+
+ req = osp_sync_new_job(d, llh, h, OST_DESTROY, &RQF_OST_DESTROY);
+ if (IS_ERR(req))
+ RETURN(PTR_ERR(req));
+
+ body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
+ if (body == NULL)
+ RETURN(-EFAULT);
+ rc = fid_ostid_pack(&rec->lur_fid, &body->oa.o_oi);
+ if (rc < 0)
+ RETURN(rc);
+ body->oa.o_misc = rec->lur_count;
+ body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID | OBD_MD_FLOBJCOUNT;
+
+ osp_sync_send_new_rpc(d, req);
+ RETURN(0);
+}
+
+static int osp_sync_process_record(const struct lu_env *env,
+ struct osp_device *d,
+ struct llog_handle *llh,
+ struct llog_rec_hdr *rec)
+{
+ struct llog_cookie cookie;
+ int rc = 0;
+
+ cookie.lgc_lgl = llh->lgh_id;
+ cookie.lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
+ cookie.lgc_index = rec->lrh_index;
+
+ if (unlikely(rec->lrh_type == LLOG_GEN_REC)) {
+ struct llog_gen_rec *gen = (struct llog_gen_rec *)rec;
+
+ /* we're waiting for the record generated by this instance */
+ LASSERT(d->opd_syn_prev_done == 0);
+ if (!memcmp(&d->opd_syn_generation, &gen->lgr_gen,
+ sizeof(gen->lgr_gen))) {
+ CDEBUG(D_HA, "processed all old entries\n");
+ d->opd_syn_prev_done = 1;
+ }
+
+ /* cancel any generation record */
+ rc = llog_cat_cancel_records(env, llh->u.phd.phd_cat_handle,
+ 1, &cookie);
+
+ return rc;
+ }
+
+ /*
+ * now we prepare and fill requests to OST, put them on the queue
+ * and fire after next commit callback
+ */
+
+ /* notice we increment counters before sending RPC, to be consistent
+ * in RPC interpret callback which may happen very quickly */
+ cfs_spin_lock(&d->opd_syn_lock);
+ d->opd_syn_rpc_in_flight++;
+ d->opd_syn_rpc_in_progress++;
+ cfs_spin_unlock(&d->opd_syn_lock);
+
+ switch (rec->lrh_type) {
+ /* case MDS_UNLINK_REC is kept for compatibility */
+ case MDS_UNLINK_REC:
+ rc = osp_sync_new_unlink_job(d, llh, rec);
+ break;
+ case MDS_UNLINK64_REC:
+ rc = osp_sync_new_unlink64_job(d, llh, rec);
+ break;
+ case MDS_SETATTR64_REC:
+ rc = osp_sync_new_setattr_job(d, llh, rec);
+ break;
+ default:
+ CERROR("unknown record type: %x\n", rec->lrh_type);
+ rc = -EINVAL;
+ break;
+ }
+
+ if (likely(rc == 0)) {
+ cfs_spin_lock(&d->opd_syn_lock);
+ if (d->opd_syn_prev_done) {
+ LASSERT(d->opd_syn_changes > 0);
+ LASSERT(rec->lrh_id <= d->opd_syn_last_committed_id);
+ /*
+ * NOTE: it's possible to meet same id if
+ * OST stores few stripes of same file
+ */
+ if (rec->lrh_id > d->opd_syn_last_processed_id)
+ d->opd_syn_last_processed_id = rec->lrh_id;
+
+ d->opd_syn_changes--;
+ }
+ CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
+ d->opd_obd->obd_name, d->opd_syn_rpc_in_flight,
+ d->opd_syn_rpc_in_progress);
+ cfs_spin_unlock(&d->opd_syn_lock);
+ } else {
+ cfs_spin_lock(&d->opd_syn_lock);
+ d->opd_syn_rpc_in_flight--;
+ d->opd_syn_rpc_in_progress--;
+ cfs_spin_unlock(&d->opd_syn_lock);
+ }
+
+ CDEBUG(D_HA, "found record %x, %d, idx %u, id %u: %d\n",
+ rec->lrh_type, rec->lrh_len, rec->lrh_index, rec->lrh_id, rc);
+ return rc;
+}
+
+static void osp_sync_process_committed(const struct lu_env *env,
+ struct osp_device *d)
+{
+ struct obd_device *obd = d->opd_obd;
+ struct obd_import *imp = obd->u.cli.cl_import;
+ struct ost_body *body;
+ struct ptlrpc_request *req, *tmp;
+ struct llog_ctxt *ctxt;
+ struct llog_handle *llh;
+ cfs_list_t list;
+ int rc, done = 0;
+
+ ENTRY;
+
+ if (cfs_list_empty(&d->opd_syn_committed_there))
+ return;
+
+ /*
+ * if current status is -ENOSPC (lack of free space on OST)
+ * then we should poll OST immediately once object destroy
+ * is committed.
+ * notice: we do this upon commit as well because some backends
+ * (like DMU) do not release space right away.
+ */
+ if (unlikely(d->opd_pre_status == -ENOSPC))
+ osp_statfs_need_now(d);
+
+ /*
+ * now cancel them all
+ * XXX: can we improve this using some batching?
+ * with batch RPC that'll happen automatically?
+ * XXX: can we store ctxt in lod_device and save few cycles ?
+ */
+ ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
+ LASSERT(ctxt);
+
+ llh = ctxt->loc_handle;
+ LASSERT(llh);
+
+ CFS_INIT_LIST_HEAD(&list);
+ cfs_spin_lock(&d->opd_syn_lock);
+ cfs_list_splice(&d->opd_syn_committed_there, &list);
+ CFS_INIT_LIST_HEAD(&d->opd_syn_committed_there);
+ cfs_spin_unlock(&d->opd_syn_lock);
+
+ cfs_list_for_each_entry_safe(req, tmp, &list, rq_exp_list) {
+ LASSERT(req->rq_svc_thread == (void *) OSP_JOB_MAGIC);
+ cfs_list_del_init(&req->rq_exp_list);
+
+ body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
+ LASSERT(body);
+
+ /* import can be closing, thus all commit cb's are
+ * called we can check committness directly */
+ if (req->rq_transno <= imp->imp_peer_committed_transno) {
+ rc = llog_cat_cancel_records(env, llh, 1,
+ &body->oa.o_lcookie);
+ if (rc)
+ CERROR("%s: can't cancel record: %d\n",
+ obd->obd_name, rc);
+ } else {
+ DEBUG_REQ(D_HA, req, "not committed");
+ }
+
+ ptlrpc_req_finished(req);
+ done++;
+ }
+
+ llog_ctxt_put(ctxt);
+
+ LASSERT(d->opd_syn_rpc_in_progress >= done);
+ cfs_spin_lock(&d->opd_syn_lock);
+ d->opd_syn_rpc_in_progress -= done;
+ cfs_spin_unlock(&d->opd_syn_lock);
+ CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
+ d->opd_obd->obd_name, d->opd_syn_rpc_in_flight,
+ d->opd_syn_rpc_in_progress);
+
+ osp_sync_check_for_work(d);
+
+ EXIT;
+}
+
+/*
+ * this is where most of queues processing happens
+ */
+static int osp_sync_process_queues(const struct lu_env *env,
+ struct llog_handle *llh,
+ struct llog_rec_hdr *rec,
+ void *data)
+{
+ struct osp_device *d = data;
+ int rc;
+
+ do {
+ struct l_wait_info lwi = { 0 };
+
+ if (!osp_sync_running(d)) {
+ CDEBUG(D_HA, "stop llog processing\n");
+ return LLOG_PROC_BREAK;
+ }
+
+ /* process requests committed by OST */
+ osp_sync_process_committed(env, d);
+
+ /* if we there are changes to be processed and we have
+ * resources for this ... do now */
+ if (osp_sync_can_process_new(d, rec)) {
+ if (llh == NULL) {
+ /* ask llog for another record */
+ CDEBUG(D_HA, "%lu changes, %u in progress, %u in flight\n",
+ d->opd_syn_changes,
+ d->opd_syn_rpc_in_progress,
+ d->opd_syn_rpc_in_flight);
+ return 0;
+ }
+
+ /*
+ * try to send, in case of disconnection, suspend
+ * processing till we can send this request
+ */
+ do {
+ rc = osp_sync_process_record(env, d, llh, rec);
+ /*
+ * XXX: probably different handling is needed
+ * for some bugs, like immediate exit or if
+ * OSP gets inactive
+ */
+ if (rc) {
+ CERROR("can't send: %d\n", rc);
+ l_wait_event(d->opd_syn_waitq,
+ !osp_sync_running(d) ||
+ osp_sync_has_work(d),
+ &lwi);
+ }
+ } while (rc != 0 && osp_sync_running(d));
+
+ llh = NULL;
+ rec = NULL;
+ }
+
+ if (d->opd_syn_last_processed_id == d->opd_syn_last_used_id)
+ osp_sync_remove_from_tracker(d);
+
+ l_wait_event(d->opd_syn_waitq,
+ !osp_sync_running(d) ||
+ osp_sync_can_process_new(d, rec) ||
+ !cfs_list_empty(&d->opd_syn_committed_there),
+ &lwi);
+ } while (1);
+}
+
+/*
+ * this thread runs llog_cat_process() scanner calling our callback
+ * to process llog records. in the callback we implement tricky
+ * state machine as we don't want to start scanning of the llog again
+ * and again, also we don't want to process too many records and send
+ * too many RPCs a time. so, depending on current load (num of changes
+ * being synced to OST) the callback can suspend awaiting for some
+ * new conditions, like syncs completed.
+ *
+ * in order to process llog records left by previous boots and to allow
+ * llog_process_thread() to find something (otherwise it'd just exit
+ * immediately) we add a special GENERATATION record on each boot.
+ */
+static int osp_sync_thread(void *_arg)
+{
+ struct osp_device *d = _arg;
+ struct ptlrpc_thread *thread = &d->opd_syn_thread;
+ struct l_wait_info lwi = { 0 };
+ struct llog_ctxt *ctxt;
+ struct obd_device *obd = d->opd_obd;
+ struct llog_handle *llh;
+ struct lu_env env;
+ int rc;
+ char pname[16];
+
+ ENTRY;
+
+ rc = lu_env_init(&env, LCT_LOCAL);
+ if (rc) {
+ CERROR("%s: can't initialize env: rc = %d\n",
+ obd->obd_name, rc);
+ RETURN(rc);
+ }
+
+ sprintf(pname, "osp-syn-%u\n", d->opd_index);
+ cfs_daemonize(pname);
+
+ cfs_spin_lock(&d->opd_syn_lock);
+ thread->t_flags = SVC_RUNNING;
+ cfs_spin_unlock(&d->opd_syn_lock);
+ cfs_waitq_signal(&thread->t_ctl_waitq);
+
+ ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
+ if (ctxt == NULL) {
+ CERROR("can't get appropriate context\n");
+ GOTO(out, rc = -EINVAL);
+ }
+
+ llh = ctxt->loc_handle;
+ if (llh == NULL) {
+ CERROR("can't get llh\n");
+ llog_ctxt_put(ctxt);
+ GOTO(out, rc = -EINVAL);
+ }
+
+ rc = llog_cat_process(&env, llh, osp_sync_process_queues, d, 0, 0);
+ LASSERTF(rc == 0 || rc == LLOG_PROC_BREAK,
+ "%lu changes, %u in progress, %u in flight: %d\n",
+ d->opd_syn_changes, d->opd_syn_rpc_in_progress,
+ d->opd_syn_rpc_in_flight, rc);
+
+ /* we don't expect llog_process_thread() to exit till umount */
+ LASSERTF(thread->t_flags != SVC_RUNNING,
+ "%lu changes, %u in progress, %u in flight\n",
+ d->opd_syn_changes, d->opd_syn_rpc_in_progress,
+ d->opd_syn_rpc_in_flight);
+
+ osp_sync_process_committed(&env, d);
+
+ llog_cat_close(&env, llh);
+ rc = llog_cleanup(&env, ctxt);
+ if (rc)
+ CERROR("can't cleanup llog: %d\n", rc);
+out:
+ thread->t_flags = SVC_STOPPED;
+
+ /*
+ * there might be a race between osp sync thread sending RPCs and
+ * import invalidation. this can result in RPCs being in ptlrpcd
+ * till this point. for safete reason let's wait till they are done
+ */
+ l_wait_event(d->opd_syn_waitq, d->opd_syn_rpc_in_flight == 0, &lwi);
+
+ cfs_waitq_signal(&thread->t_ctl_waitq);
+ LASSERTF(d->opd_syn_rpc_in_progress == 0,
+ "%s: %d %d %sempty\n",
+ d->opd_obd->obd_name, d->opd_syn_rpc_in_progress,
+ d->opd_syn_rpc_in_flight,
+ cfs_list_empty(&d->opd_syn_committed_there) ? "" : "!");
+
+ lu_env_fini(&env);
+
+ RETURN(0);
+}
+
+static struct llog_operations osp_mds_ost_orig_logops;
+
+static int osp_sync_llog_init(const struct lu_env *env, struct osp_device *d)
+{
+ struct osp_thread_info *osi = osp_env_info(env);
+ struct llog_handle *lgh;
+ struct obd_device *obd = d->opd_obd;
+ struct llog_ctxt *ctxt;
+ int rc;
+
+ ENTRY;
+
+ LASSERT(obd);
+
+ /*
+ * open llog corresponding to our OST
+ */
+ OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
+ obd->obd_lvfs_ctxt.dt = d->opd_storage;
+
+ rc = llog_osd_get_cat_list(env, d->opd_storage, d->opd_index, 1,
+ &osi->osi_cid);
+ if (rc) {
+ CERROR("%s: can't get id from catalogs: rc = %d\n",
+ obd->obd_name, rc);
+ RETURN(rc);
+ }
+
+ CDEBUG(D_INFO, "%s: Init llog for %d - catid "LPX64"/"LPX64":%x\n",
+ obd->obd_name, d->opd_index, osi->osi_cid.lci_logid.lgl_oid,
+ osi->osi_cid.lci_logid.lgl_oseq,
+ osi->osi_cid.lci_logid.lgl_ogen);
+
+ osp_mds_ost_orig_logops = llog_osd_ops;
+ rc = llog_setup(env, obd, &obd->obd_olg, LLOG_MDS_OST_ORIG_CTXT, obd,
+ &osp_mds_ost_orig_logops);
+ if (rc)
+ RETURN(rc);
+
+ ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
+ LASSERT(ctxt);
+
+ if (likely(osi->osi_cid.lci_logid.lgl_oid != 0)) {
+ rc = llog_open(env, ctxt, &lgh, &osi->osi_cid.lci_logid, NULL,
+ LLOG_OPEN_EXISTS);
+ /* re-create llog if it is missing */
+ if (rc == -ENOENT)
+ osi->osi_cid.lci_logid.lgl_oid = 0;
+ else if (rc < 0)
+ GOTO(out_cleanup, rc);
+ }
+
+ if (unlikely(osi->osi_cid.lci_logid.lgl_oid == 0)) {
+ rc = llog_open_create(env, ctxt, &lgh, NULL, NULL);
+ if (rc < 0)
+ GOTO(out_cleanup, rc);
+ osi->osi_cid.lci_logid = lgh->lgh_id;
+ }
+
+ ctxt->loc_handle = lgh;
+ lgh->lgh_logops->lop_add = llog_cat_add_rec;
+ lgh->lgh_logops->lop_declare_add = llog_cat_declare_add_rec;
+
+ rc = llog_cat_init_and_process(env, lgh);
+ if (rc)
+ GOTO(out_close, rc);
+
+ rc = llog_osd_put_cat_list(env, d->opd_storage, d->opd_index, 1,
+ &osi->osi_cid);
+ if (rc)
+ GOTO(out_close, rc);
+
+ /*
+ * put a mark in the llog till which we'll be processing
+ * old records restless
+ */
+ d->opd_syn_generation.mnt_cnt = cfs_time_current();
+ d->opd_syn_generation.conn_cnt = cfs_time_current();
+
+ osi->osi_hdr.lrh_type = LLOG_GEN_REC;
+ osi->osi_hdr.lrh_len = sizeof(osi->osi_gen);
+
+ memcpy(&osi->osi_gen.lgr_gen, &d->opd_syn_generation,
+ sizeof(osi->osi_gen.lgr_gen));
+
+ rc = llog_cat_add(env, lgh, &osi->osi_gen.lgr_hdr, &osi->osi_cookie,
+ NULL);
+ if (rc < 0)
+ GOTO(out_close, rc);
+ llog_ctxt_put(ctxt);
+ RETURN(0);
+out_close:
+ llog_cat_close(env, lgh);
+out_cleanup:
+ llog_cleanup(env, ctxt);
+ RETURN(rc);
+}
+
+static void osp_sync_llog_fini(const struct lu_env *env, struct osp_device *d)
+{
+ struct llog_ctxt *ctxt;
+
+ ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
+ llog_cat_close(env, ctxt->loc_handle);
+ llog_cleanup(env, ctxt);
+}
+
+/*
+ * initializes sync component of OSP
+ */
+int osp_sync_init(const struct lu_env *env, struct osp_device *d)
+{
+ struct l_wait_info lwi = { 0 };
+ int rc;
+
+ ENTRY;
+
+ rc = osp_sync_id_traction_init(d);
+ if (rc)
+ RETURN(rc);
+
+ /*
+ * initialize llog storing changes
+ */
+ rc = osp_sync_llog_init(env, d);
+ if (rc) {
+ CERROR("%s: can't initialize llog: rc = %d\n",
+ d->opd_obd->obd_name, rc);
+ GOTO(err_id, rc);
+ }
+
+ /*
+ * Start synchronization thread
+ */
+ d->opd_syn_max_rpc_in_flight = OSP_MAX_IN_FLIGHT;
+ d->opd_syn_max_rpc_in_progress = OSP_MAX_IN_PROGRESS;
+ cfs_spin_lock_init(&d->opd_syn_lock);
+ cfs_waitq_init(&d->opd_syn_waitq);
+ cfs_waitq_init(&d->opd_syn_thread.t_ctl_waitq);
+ CFS_INIT_LIST_HEAD(&d->opd_syn_committed_there);
+
+ rc = cfs_create_thread(osp_sync_thread, d, 0);
+ if (rc < 0) {
+ CERROR("%s: can't start sync thread: rc = %d\n",
+ d->opd_obd->obd_name, rc);
+ GOTO(err_llog, rc);
+ }
+
+ l_wait_event(d->opd_syn_thread.t_ctl_waitq,
+ osp_sync_running(d) || osp_sync_stopped(d), &lwi);
+
+ RETURN(0);
+err_llog:
+ osp_sync_llog_fini(env, d);
+err_id:
+ osp_sync_id_traction_fini(d);
+ return rc;
+}
+
+int osp_sync_fini(struct osp_device *d)
+{
+ struct ptlrpc_thread *thread = &d->opd_syn_thread;
+
+ ENTRY;
+
+ thread->t_flags = SVC_STOPPING;
+ cfs_waitq_signal(&d->opd_syn_waitq);
+ cfs_wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_STOPPED);
+
+ /*
+ * unregister transaction callbacks only when sync thread
+ * has finished operations with llog
+ */
+ osp_sync_id_traction_fini(d);
+
+ RETURN(0);
+}
+
+static CFS_DEFINE_MUTEX(osp_id_tracker_sem);
+static CFS_LIST_HEAD(osp_id_tracker_list);
+
+static void osp_sync_tracker_commit_cb(struct thandle *th, void *cookie)
+{
+ struct osp_id_tracker *tr = cookie;
+ struct osp_device *d;
+ struct osp_txn_info *txn;
+
+ LASSERT(tr);
+
+ txn = osp_txn_info(&th->th_ctx);
+ if (txn == NULL || txn->oti_current_id < tr->otr_committed_id)
+ return;
+
+ cfs_spin_lock(&tr->otr_lock);
+ if (likely(txn->oti_current_id > tr->otr_committed_id)) {
+ CDEBUG(D_OTHER, "committed: %u -> %u\n",
+ tr->otr_committed_id, txn->oti_current_id);
+ tr->otr_committed_id = txn->oti_current_id;
+
+ cfs_list_for_each_entry(d, &tr->otr_wakeup_list,
+ opd_syn_ontrack) {
+ d->opd_syn_last_committed_id = tr->otr_committed_id;
+ cfs_waitq_signal(&d->opd_syn_waitq);
+ }
+ }
+ cfs_spin_unlock(&tr->otr_lock);
+}
+
+static int osp_sync_id_traction_init(struct osp_device *d)
+{
+ struct osp_id_tracker *tr, *found = NULL;
+ int rc = 0;
+
+ LASSERT(d);
+ LASSERT(d->opd_storage);
+ LASSERT(d->opd_syn_tracker == NULL);
+ CFS_INIT_LIST_HEAD(&d->opd_syn_ontrack);
+
+ cfs_mutex_lock(&osp_id_tracker_sem);
+ cfs_list_for_each_entry(tr, &osp_id_tracker_list, otr_list) {
+ if (tr->otr_dev == d->opd_storage) {
+ LASSERT(cfs_atomic_read(&tr->otr_refcount));
+ cfs_atomic_inc(&tr->otr_refcount);
+ d->opd_syn_tracker = tr;
+ found = tr;
+ break;
+ }
+ }
+
+ if (found == NULL) {
+ rc = -ENOMEM;
+ OBD_ALLOC_PTR(tr);
+ if (tr) {
+ d->opd_syn_tracker = tr;
+ cfs_spin_lock_init(&tr->otr_lock);
+ tr->otr_dev = d->opd_storage;
+ tr->otr_next_id = 1;
+ tr->otr_committed_id = 0;
+ cfs_atomic_set(&tr->otr_refcount, 1);
+ CFS_INIT_LIST_HEAD(&tr->otr_wakeup_list);
+ cfs_list_add(&tr->otr_list, &osp_id_tracker_list);
+ tr->otr_tx_cb.dtc_txn_commit =
+ osp_sync_tracker_commit_cb;
+ tr->otr_tx_cb.dtc_cookie = tr;
+ tr->otr_tx_cb.dtc_tag = LCT_MD_THREAD;
+ dt_txn_callback_add(d->opd_storage, &tr->otr_tx_cb);
+ rc = 0;
+ }
+ }
+ cfs_mutex_unlock(&osp_id_tracker_sem);
+
+ return rc;
+}
+
+static void osp_sync_id_traction_fini(struct osp_device *d)
+{
+ struct osp_id_tracker *tr;
+
+ ENTRY;
+
+ LASSERT(d);
+ tr = d->opd_syn_tracker;
+ if (tr == NULL) {
+ EXIT;
+ return;
+ }
+
+ osp_sync_remove_from_tracker(d);
+
+ cfs_mutex_lock(&osp_id_tracker_sem);
+ if (cfs_atomic_dec_and_test(&tr->otr_refcount)) {
+ dt_txn_callback_del(d->opd_storage, &tr->otr_tx_cb);
+ LASSERT(cfs_list_empty(&tr->otr_wakeup_list));
+ cfs_list_del(&tr->otr_list);
+ OBD_FREE_PTR(tr);
+ d->opd_syn_tracker = NULL;
+ }
+ cfs_mutex_unlock(&osp_id_tracker_sem);
+
+ EXIT;
+}
+
+/*
+ * generates id for the tracker
+ */
+static __u32 osp_sync_id_get(struct osp_device *d, __u32 id)
+{
+ struct osp_id_tracker *tr;
+
+ tr = d->opd_syn_tracker;
+ LASSERT(tr);
+
+ /* XXX: we can improve this introducing per-cpu preallocated ids? */
+ cfs_spin_lock(&tr->otr_lock);
+ if (unlikely(tr->otr_next_id <= d->opd_syn_last_used_id)) {
+ cfs_spin_unlock(&tr->otr_lock);
+ CERROR("%s: next %u, last synced %lu\n",
+ d->opd_obd->obd_name, tr->otr_next_id,
+ d->opd_syn_last_used_id);
+ LBUG();
+ }
+
+ if (id == 0)
+ id = tr->otr_next_id++;
+ if (id > d->opd_syn_last_used_id)
+ d->opd_syn_last_used_id = id;
+ if (cfs_list_empty(&d->opd_syn_ontrack))
+ cfs_list_add(&d->opd_syn_ontrack, &tr->otr_wakeup_list);
+ cfs_spin_unlock(&tr->otr_lock);
+ CDEBUG(D_OTHER, "new id %u\n", (unsigned) id);
+
+ return id;
+}
+
+static void osp_sync_remove_from_tracker(struct osp_device *d)
+{
+ struct osp_id_tracker *tr;
+
+ tr = d->opd_syn_tracker;
+ LASSERT(tr);
+
+ if (cfs_list_empty(&d->opd_syn_ontrack))
+ return;
+
+ cfs_spin_lock(&tr->otr_lock);
+ cfs_list_del_init(&d->opd_syn_ontrack);
+ cfs_spin_unlock(&tr->otr_lock);
+}
+
git://git.whamcloud.com / fs / lustre-release.git / commitdiff