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7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2014, Intel Corporation.
26 * lustre/osp/osp_trans.c
29 * 1. OSP (Object Storage Proxy) transaction methods
31 * Implement OSP layer transaction related interfaces for the dt_device API
32 * dt_device_operations.
35 * 2. Handle asynchronous idempotent operations
37 * The OSP uses OUT (Object Unified Target) RPC to talk with other server
38 * (MDT or OST) for kinds of operations, such as create, unlink, insert,
39 * delete, lookup, set_(x)attr, get_(x)attr, and etc. To reduce the number
40 * of RPCs, we allow multiple operations to be packaged together in single
43 * For the asynchronous idempotent operations, such as get_(x)attr, related
44 * RPCs will be inserted into a osp_device based shared asynchronous request
45 * queue - osp_device::opd_async_requests. When the queue is full, all the
46 * requests in the queue will be packaged into a single OUT RPC and given to
47 * the ptlrpcd daemon (for sending), then the queue is purged and other new
48 * requests can be inserted into it.
50 * When the asynchronous idempotent operation inserts the request into the
51 * shared queue, it will register an interpreter. When the packaged OUT RPC
52 * is replied (or failed to be sent out), all the registered interpreters
53 * will be called one by one to handle each own result.
56 * Author: Di Wang <di.wang@intel.com>
57 * Author: Fan, Yong <fan.yong@intel.com>
60 #define DEBUG_SUBSYSTEM S_MDS
62 #include "osp_internal.h"
64 struct osp_async_update_args {
65 struct dt_update_request *oaua_update;
67 wait_queue_head_t *oaua_waitq;
68 bool oaua_flow_control;
71 struct osp_async_request {
72 /* list in the dt_update_request::dur_cb_items */
73 struct list_head oar_list;
75 /* The target of the async update request. */
76 struct osp_object *oar_obj;
78 /* The data used by oar_interpreter. */
81 /* The interpreter function called after the async request handled. */
82 osp_async_request_interpreter_t oar_interpreter;
86 * Allocate an asynchronous request and initialize it with the given parameters.
88 * \param[in] obj pointer to the operation target
89 * \param[in] data pointer to the data used by the interpreter
90 * \param[in] interpreter pointer to the interpreter function
92 * \retval pointer to the asychronous request
93 * \retval NULL if the allocation failed
95 static struct osp_async_request *
96 osp_async_request_init(struct osp_object *obj, void *data,
97 osp_async_request_interpreter_t interpreter)
99 struct osp_async_request *oar;
105 lu_object_get(osp2lu_obj(obj));
106 INIT_LIST_HEAD(&oar->oar_list);
108 oar->oar_data = data;
109 oar->oar_interpreter = interpreter;
115 * Destroy the asychronous request.
117 * \param[in] env pointer to the thread context
118 * \param[in] oar pointer to asychronous request
120 static void osp_async_request_fini(const struct lu_env *env,
121 struct osp_async_request *oar)
123 LASSERT(list_empty(&oar->oar_list));
125 lu_object_put(env, osp2lu_obj(oar->oar_obj));
130 * Interpret the packaged OUT RPC results.
132 * For every packaged sub-request, call its registered interpreter function.
133 * Then destroy the sub-request.
135 * \param[in] env pointer to the thread context
136 * \param[in] req pointer to the RPC
137 * \param[in] arg pointer to data used by the interpreter
138 * \param[in] rc the RPC return value
140 * \retval 0 for success
141 * \retval negative error number on failure
143 static int osp_async_update_interpret(const struct lu_env *env,
144 struct ptlrpc_request *req,
147 struct object_update_reply *reply = NULL;
148 struct osp_async_update_args *oaua = arg;
149 struct dt_update_request *dt_update = oaua->oaua_update;
150 struct osp_async_request *oar;
151 struct osp_async_request *next;
156 if (oaua->oaua_flow_control)
157 obd_put_request_slot(
158 &dt2osp_dev(dt_update->dur_dt)->opd_obd->u.cli);
160 /* Unpack the results from the reply message. */
161 if (req->rq_repmsg != NULL) {
162 reply = req_capsule_server_sized_get(&req->rq_pill,
163 &RMF_OUT_UPDATE_REPLY,
164 OUT_UPDATE_REPLY_SIZE);
165 if (reply == NULL || reply->ourp_magic != UPDATE_REPLY_MAGIC)
168 count = reply->ourp_count;
173 list_for_each_entry_safe(oar, next, &dt_update->dur_cb_items,
175 list_del_init(&oar->oar_list);
177 /* The peer may only have handled some requests (indicated
178 * by the 'count') in the packaged OUT RPC, we can only get
179 * results for the handled part. */
180 if (index < count && reply->ourp_lens[index] > 0) {
181 struct object_update_result *result;
183 result = object_update_result_get(reply, index, NULL);
187 rc1 = result->our_rc;
190 if (unlikely(rc1 == 0))
194 oar->oar_interpreter(env, reply, req, oar->oar_obj,
195 oar->oar_data, index, rc1);
196 osp_async_request_fini(env, oar);
200 if (oaua->oaua_count != NULL && atomic_dec_and_test(oaua->oaua_count))
201 wake_up_all(oaua->oaua_waitq);
203 dt_update_request_destroy(dt_update);
209 * Pack all the requests in the shared asynchronous idempotent request queue
210 * into a single OUT RPC that will be given to the background ptlrpcd daemon.
212 * \param[in] env pointer to the thread context
213 * \param[in] osp pointer to the OSP device
214 * \param[in] update pointer to the shared queue
216 * \retval 0 for success
217 * \retval negative error number on failure
219 int osp_unplug_async_request(const struct lu_env *env,
220 struct osp_device *osp,
221 struct dt_update_request *update)
223 struct osp_async_update_args *args;
224 struct ptlrpc_request *req = NULL;
227 rc = out_prep_update_req(env, osp->opd_obd->u.cli.cl_import,
228 update->dur_buf.ub_req, &req);
230 struct osp_async_request *oar;
231 struct osp_async_request *next;
233 list_for_each_entry_safe(oar, next,
234 &update->dur_cb_items, oar_list) {
235 list_del_init(&oar->oar_list);
236 oar->oar_interpreter(env, NULL, NULL, oar->oar_obj,
237 oar->oar_data, 0, rc);
238 osp_async_request_fini(env, oar);
240 dt_update_request_destroy(update);
242 LASSERT(list_empty(&update->dur_list));
244 args = ptlrpc_req_async_args(req);
245 args->oaua_update = update;
246 args->oaua_count = NULL;
247 args->oaua_waitq = NULL;
248 args->oaua_flow_control = false;
249 req->rq_interpret_reply = osp_async_update_interpret;
250 ptlrpcd_add_req(req, PDL_POLICY_LOCAL, -1);
257 * Find or create (if NOT exist or purged) the shared asynchronous idempotent
258 * request queue - osp_device::opd_async_requests.
260 * If the osp_device::opd_async_requests is not NULL, then return it directly;
261 * otherwise create new dt_update_request and attach it to opd_async_requests.
263 * \param[in] osp pointer to the OSP device
265 * \retval pointer to the shared queue
266 * \retval negative error number on failure
268 static struct dt_update_request *
269 osp_find_or_create_async_update_request(struct osp_device *osp)
271 struct dt_update_request *update = osp->opd_async_requests;
276 update = dt_update_request_create(&osp->opd_dt_dev);
278 osp->opd_async_requests = update;
284 * Insert an asynchronous idempotent request to the shared request queue that
285 * is attached to the osp_device.
287 * This function generates a new osp_async_request with the given parameters,
288 * then tries to insert the request into the osp_device-based shared request
289 * queue. If the queue is full, then triggers the packaged OUT RPC to purge
290 * the shared queue firstly, and then re-tries.
292 * NOTE: must hold the osp::opd_async_requests_mutex to serialize concurrent
293 * osp_insert_async_request call from others.
295 * \param[in] env pointer to the thread context
296 * \param[in] op operation type, see 'enum update_type'
297 * \param[in] obj pointer to the operation target
298 * \param[in] count array size of the subsequent \a lens and \a bufs
299 * \param[in] lens buffer length array for the subsequent \a bufs
300 * \param[in] bufs the buffers to compose the request
301 * \param[in] data pointer to the data used by the interpreter
302 * \param[in] interpreter pointer to the interpreter function
304 * \retval 0 for success
305 * \retval negative error number on failure
307 int osp_insert_async_request(const struct lu_env *env, enum update_type op,
308 struct osp_object *obj, int count,
309 __u16 *lens, const void **bufs, void *data,
310 osp_async_request_interpreter_t interpreter)
312 struct osp_async_request *oar;
313 struct osp_device *osp = lu2osp_dev(osp2lu_obj(obj)->lo_dev);
314 struct dt_update_request *update;
318 oar = osp_async_request_init(obj, data, interpreter);
322 update = osp_find_or_create_async_update_request(osp);
324 GOTO(out, rc = PTR_ERR(update));
327 /* The queue is full. */
328 rc = out_update_pack(env, &update->dur_buf, op,
329 lu_object_fid(osp2lu_obj(obj)), count, lens, bufs,
332 osp->opd_async_requests = NULL;
333 mutex_unlock(&osp->opd_async_requests_mutex);
335 rc = osp_unplug_async_request(env, osp, update);
336 mutex_lock(&osp->opd_async_requests_mutex);
340 update = osp_find_or_create_async_update_request(osp);
342 GOTO(out, rc = PTR_ERR(update));
348 list_add_tail(&oar->oar_list, &update->dur_cb_items);
354 osp_async_request_fini(env, oar);
360 * The OSP layer dt_device_operations::dt_trans_create() interface
361 * to create a transaction.
363 * There are two kinds of transactions that will involve OSP:
365 * 1) If the transaction only contains the updates on remote server
366 * (MDT or OST), such as re-generating the lost OST-object for
367 * LFSCK, then it is a remote transaction. For remote transaction,
368 * the upper layer caller (such as the LFSCK engine) will call the
369 * dt_trans_create() (with the OSP dt_device as the parameter),
370 * then the call will be directed to the osp_trans_create() that
371 * creates the transaction handler and returns it to the caller.
373 * 2) If the transcation contains both local and remote updates,
374 * such as cross MDTs create under DNE mode, then the upper layer
375 * caller will not trigger osp_trans_create(). Instead, it will
376 * call dt_trans_create() on other dt_device, such as LOD that
377 * will generate the transaction handler. Such handler will be
378 * used by the whole transaction in subsequent sub-operations.
380 * \param[in] env pointer to the thread context
381 * \param[in] d pointer to the OSP dt_device
383 * \retval pointer to the transaction handler
384 * \retval negative error number on failure
386 struct thandle *osp_trans_create(const struct lu_env *env, struct dt_device *d)
388 struct thandle *th = NULL;
389 struct thandle_update *tu = NULL;
393 if (unlikely(th == NULL))
394 GOTO(out, rc = -ENOMEM);
397 th->th_tags = LCT_TX_HANDLE;
398 atomic_set(&th->th_refc, 1);
399 th->th_alloc_size = sizeof(*th);
403 GOTO(out, rc = -ENOMEM);
405 INIT_LIST_HEAD(&tu->tu_remote_update_list);
406 tu->tu_only_remote_trans = 1;
422 * Trigger the request for remote updates.
424 * If the transaction is not a remote one or it is required to be sync mode
425 * (th->th_sync is set), then it will be sent synchronously; otherwise, the
426 * RPC will be sent asynchronously.
428 * Please refer to osp_trans_create() for transaction type.
430 * \param[in] env pointer to the thread context
431 * \param[in] osp pointer to the OSP device
432 * \param[in] dt_update pointer to the dt_update_request
433 * \param[in] th pointer to the transaction handler
434 * \param[in] flow_control whether need to control the flow
436 * \retval 0 for success
437 * \retval negative error number on failure
439 static int osp_trans_trigger(const struct lu_env *env, struct osp_device *osp,
440 struct dt_update_request *dt_update,
441 struct thandle *th, bool flow_control)
443 struct thandle_update *tu = th->th_update;
448 if (is_only_remote_trans(th)) {
449 struct osp_async_update_args *args;
450 struct ptlrpc_request *req;
452 list_del_init(&dt_update->dur_list);
454 rc = out_remote_sync(env, osp->opd_obd->u.cli.cl_import,
456 dt_update_request_destroy(dt_update);
461 rc = out_prep_update_req(env, osp->opd_obd->u.cli.cl_import,
462 dt_update->dur_buf.ub_req, &req);
464 down_read(&osp->opd_async_updates_rwsem);
466 args = ptlrpc_req_async_args(req);
467 args->oaua_update = dt_update;
468 args->oaua_count = &osp->opd_async_updates_count;
469 args->oaua_waitq = &osp->opd_syn_barrier_waitq;
470 args->oaua_flow_control = flow_control;
471 req->rq_interpret_reply =
472 osp_async_update_interpret;
474 atomic_inc(args->oaua_count);
475 up_read(&osp->opd_async_updates_rwsem);
477 ptlrpcd_add_req(req, PDL_POLICY_LOCAL, -1);
479 dt_update_request_destroy(dt_update);
483 rc = out_remote_sync(env, osp->opd_obd->u.cli.cl_import,
491 * The OSP layer dt_device_operations::dt_trans_start() interface
492 * to start the transaction.
494 * If the transaction is a remote transaction, then related remote
495 * updates will be triggered in the osp_trans_stop(); otherwise the
496 * transaction contains both local and remote update(s), then when
497 * the OUT RPC will be triggered depends on the operation, and is
498 * indicated by the dt_device::tu_sent_after_local_trans, for example:
500 * 1) If it is remote create, it will send the remote req after local
501 * transaction. i.e. create the object locally first, then insert the
504 * 2) If it is remote unlink, it will send the remote req before the
505 * local transaction, i.e. delete the name entry remotely first, then
506 * destroy the local object.
508 * Please refer to osp_trans_create() for transaction type.
510 * \param[in] env pointer to the thread context
511 * \param[in] dt pointer to the OSP dt_device
512 * \param[in] th pointer to the transaction handler
514 * \retval 0 for success
515 * \retval negative error number on failure
517 int osp_trans_start(const struct lu_env *env, struct dt_device *dt,
520 struct thandle_update *tu = th->th_update;
521 struct dt_update_request *dt_update;
527 /* Check whether there are updates related with this OSP */
528 dt_update = out_find_update(tu, dt);
529 if (dt_update == NULL)
532 if (!is_only_remote_trans(th) && !tu->tu_sent_after_local_trans)
533 rc = osp_trans_trigger(env, dt2osp_dev(dt), dt_update, th,
540 * The OSP layer dt_device_operations::dt_trans_stop() interface
541 * to stop the transaction.
543 * If the transaction is a remote transaction, or the update handler
544 * is marked as 'tu_sent_after_local_trans', then related remote
545 * updates will be triggered here via osp_trans_trigger().
547 * For synchronous mode update or any failed update, the request
548 * will be destroyed explicitly when the osp_trans_stop().
550 * Please refer to osp_trans_create() for transaction type.
552 * \param[in] env pointer to the thread context
553 * \param[in] dt pointer to the OSP dt_device
554 * \param[in] th pointer to the transaction handler
556 * \retval 0 for success
557 * \retval negative error number on failure
559 int osp_trans_stop(const struct lu_env *env, struct dt_device *dt,
562 struct thandle_update *tu = th->th_update;
563 struct dt_update_request *dt_update;
568 LASSERT(tu != LP_POISON);
570 /* Check whether there are updates related with this OSP */
571 dt_update = out_find_update(tu, dt);
572 if (dt_update == NULL) {
573 if (!is_only_remote_trans(th))
579 if (dt_update->dur_buf.ub_req == NULL ||
580 dt_update->dur_buf.ub_req->ourq_count == 0) {
581 dt_update_request_destroy(dt_update);
585 if (is_only_remote_trans(th)) {
586 if (th->th_result == 0) {
587 struct osp_device *osp = dt2osp_dev(th->th_dev);
588 struct client_obd *cli = &osp->opd_obd->u.cli;
590 rc = obd_get_request_slot(cli);
591 if (!osp->opd_imp_active || !osp->opd_imp_connected) {
593 obd_put_request_slot(cli);
599 dt_update_request_destroy(dt_update);
603 rc = osp_trans_trigger(env, dt2osp_dev(dt),
604 dt_update, th, true);
606 obd_put_request_slot(cli);
609 dt_update_request_destroy(dt_update);
612 if (tu->tu_sent_after_local_trans)
613 rc = osp_trans_trigger(env, dt2osp_dev(dt),
614 dt_update, th, false);
615 rc = dt_update->dur_rc;
616 dt_update_request_destroy(dt_update);