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LU-14603 ptlrpc: quiet messages for unsupported opcodes
[fs/lustre-release.git] / lustre / target / tgt_handler.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 only,
8  * as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
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).
15  *
16  * You should have received a copy of the GNU General Public License
17  * version 2 along with this program; if not, write to the
18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19  * Boston, MA 021110-1307, USA
20  *
21  * GPL HEADER END
22  */
23 /*
24  * Copyright (c) 2013, 2017, Intel Corporation.
25  */
26 /*
27  * lustre/target/tgt_handler.c
28  *
29  * Lustre Unified Target request handler code
30  *
31  * Author: Brian Behlendorf <behlendorf1@llnl.gov>
32  * Author: Mikhail Pershin <mike.pershin@intel.com>
33  */
34
35 #define DEBUG_SUBSYSTEM S_CLASS
36
37 #include <linux/user_namespace.h>
38 #include <linux/delay.h>
39 #include <linux/uidgid.h>
40
41 #include <libcfs/linux/linux-mem.h>
42 #include <obd.h>
43 #include <obd_class.h>
44 #include <obd_cksum.h>
45 #include <lustre_lfsck.h>
46 #include <lustre_nodemap.h>
47 #include <lustre_acl.h>
48
49 #include "tgt_internal.h"
50
51 char *tgt_name(struct lu_target *tgt)
52 {
53         LASSERT(tgt->lut_obd != NULL);
54         return tgt->lut_obd->obd_name;
55 }
56 EXPORT_SYMBOL(tgt_name);
57
58 /*
59  * Generic code handling requests that have struct mdt_body passed in:
60  *
61  *  - extract mdt_body from request and save it in @tsi, if present;
62  *
63  *  - create lu_object, corresponding to the fid in mdt_body, and save it in
64  *  @tsi;
65  *
66  *  - if HAS_BODY flag is set for this request type check whether object
67  *  actually exists on storage (lu_object_exists()).
68  *
69  */
70 static int tgt_mdt_body_unpack(struct tgt_session_info *tsi, __u32 flags)
71 {
72         const struct mdt_body   *body;
73         struct lu_object        *obj;
74         struct req_capsule      *pill = tsi->tsi_pill;
75         int                      rc;
76
77         ENTRY;
78
79         body = req_capsule_client_get(pill, &RMF_MDT_BODY);
80         if (body == NULL)
81                 RETURN(-EFAULT);
82
83         tsi->tsi_mdt_body = body;
84
85         if (!(body->mbo_valid & OBD_MD_FLID))
86                 RETURN(0);
87
88         /* mdc_pack_body() doesn't check if fid is zero and set OBD_ML_FID
89          * in any case in pre-2.5 clients. Fix that here if needed */
90         if (unlikely(fid_is_zero(&body->mbo_fid1)))
91                 RETURN(0);
92
93         if (!fid_is_sane(&body->mbo_fid1)) {
94                 CERROR("%s: invalid FID: "DFID"\n", tgt_name(tsi->tsi_tgt),
95                        PFID(&body->mbo_fid1));
96                 RETURN(-EINVAL);
97         }
98
99         obj = lu_object_find(tsi->tsi_env,
100                              &tsi->tsi_tgt->lut_bottom->dd_lu_dev,
101                              &body->mbo_fid1, NULL);
102         if (!IS_ERR(obj)) {
103                 if ((flags & HAS_BODY) && !lu_object_exists(obj)) {
104                         lu_object_put(tsi->tsi_env, obj);
105                         rc = -ENOENT;
106                 } else {
107                         tsi->tsi_corpus = obj;
108                         rc = 0;
109                 }
110         } else {
111                 rc = PTR_ERR(obj);
112         }
113
114         tsi->tsi_fid = body->mbo_fid1;
115
116         RETURN(rc);
117 }
118
119 /**
120  * Validate oa from client.
121  * If the request comes from 2.0 clients, currently only RSVD seq and IDIF
122  * req are valid.
123  *    a. objects in Single MDT FS  seq = FID_SEQ_OST_MDT0, oi_id != 0
124  *    b. Echo objects(seq = 2), old echo client still use oi_id/oi_seq to
125  *       pack ost_id. Because non-zero oi_seq will make it diffcult to tell
126  *       whether this is oi_fid or real ostid. So it will check
127  *       OBD_CONNECT_FID, then convert the ostid to FID for old client.
128  *    c. Old FID-disable osc will send IDIF.
129  *    d. new FID-enable osc/osp will send normal FID.
130  *
131  * And also oi_id/f_oid should always start from 1. oi_id/f_oid = 0 will
132  * be used for LAST_ID file, and only being accessed inside OST now.
133  */
134 int tgt_validate_obdo(struct tgt_session_info *tsi, struct obdo *oa)
135 {
136         struct ost_id   *oi     = &oa->o_oi;
137         u64              seq    = ostid_seq(oi);
138         u64              id     = ostid_id(oi);
139         int              rc;
140         ENTRY;
141
142         if (unlikely(!(exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_FID) &&
143                      fid_seq_is_echo(seq))) {
144                 /* Sigh 2.[123] client still sends echo req with oi_id = 0
145                  * during create, and we will reset this to 1, since this
146                  * oi_id is basically useless in the following create process,
147                  * but oi_id == 0 will make it difficult to tell whether it is
148                  * real FID or ost_id. */
149                 oi->oi_fid.f_seq = FID_SEQ_ECHO;
150                 oi->oi_fid.f_oid = id ?: 1;
151                 oi->oi_fid.f_ver = 0;
152         } else {
153                 struct tgt_thread_info *tti = tgt_th_info(tsi->tsi_env);
154
155                 if (unlikely((oa->o_valid & OBD_MD_FLID) && id == 0))
156                         GOTO(out, rc = -EPROTO);
157
158                 /* Note: this check might be forced in 2.5 or 2.6, i.e.
159                  * all of the requests are required to setup FLGROUP */
160                 if (unlikely(!(oa->o_valid & OBD_MD_FLGROUP))) {
161                         ostid_set_seq_mdt0(oi);
162                         oa->o_valid |= OBD_MD_FLGROUP;
163                         seq = ostid_seq(oi);
164                 }
165
166                 if (unlikely(!(fid_seq_is_idif(seq) || fid_seq_is_mdt0(seq) ||
167                                fid_seq_is_norm(seq) || fid_seq_is_echo(seq))))
168                         GOTO(out, rc = -EPROTO);
169
170                 rc = ostid_to_fid(&tti->tti_fid1, oi,
171                                   tsi->tsi_tgt->lut_lsd.lsd_osd_index);
172                 if (unlikely(rc != 0))
173                         GOTO(out, rc);
174
175                 oi->oi_fid = tti->tti_fid1;
176         }
177
178         RETURN(0);
179
180 out:
181         CERROR("%s: client %s sent bad object "DOSTID": rc = %d\n",
182                tgt_name(tsi->tsi_tgt), obd_export_nid2str(tsi->tsi_exp),
183                seq, id, rc);
184         return rc;
185 }
186 EXPORT_SYMBOL(tgt_validate_obdo);
187
188 static int tgt_io_data_unpack(struct tgt_session_info *tsi, struct ost_id *oi)
189 {
190         unsigned                 max_brw;
191         struct niobuf_remote    *rnb;
192         struct obd_ioobj        *ioo;
193         int                      obj_count;
194
195         ENTRY;
196
197         ioo = req_capsule_client_get(tsi->tsi_pill, &RMF_OBD_IOOBJ);
198         if (ioo == NULL)
199                 RETURN(-EPROTO);
200
201         rnb = req_capsule_client_get(tsi->tsi_pill, &RMF_NIOBUF_REMOTE);
202         if (rnb == NULL)
203                 RETURN(-EPROTO);
204
205         max_brw = ioobj_max_brw_get(ioo);
206         if (unlikely((max_brw & (max_brw - 1)) != 0)) {
207                 CERROR("%s: client %s sent bad ioobj max %u for "DOSTID
208                        ": rc = %d\n", tgt_name(tsi->tsi_tgt),
209                        obd_export_nid2str(tsi->tsi_exp), max_brw,
210                        POSTID(oi), -EPROTO);
211                 RETURN(-EPROTO);
212         }
213         ioo->ioo_oid = *oi;
214
215         obj_count = req_capsule_get_size(tsi->tsi_pill, &RMF_OBD_IOOBJ,
216                                         RCL_CLIENT) / sizeof(*ioo);
217         if (obj_count == 0) {
218                 CERROR("%s: short ioobj\n", tgt_name(tsi->tsi_tgt));
219                 RETURN(-EPROTO);
220         } else if (obj_count > 1) {
221                 CERROR("%s: too many ioobjs (%d)\n", tgt_name(tsi->tsi_tgt),
222                        obj_count);
223                 RETURN(-EPROTO);
224         }
225
226         if (ioo->ioo_bufcnt == 0) {
227                 CERROR("%s: ioo has zero bufcnt\n", tgt_name(tsi->tsi_tgt));
228                 RETURN(-EPROTO);
229         }
230
231         if (ioo->ioo_bufcnt > PTLRPC_MAX_BRW_PAGES) {
232                 DEBUG_REQ(D_RPCTRACE, tgt_ses_req(tsi),
233                           "bulk has too many pages (%d)",
234                           ioo->ioo_bufcnt);
235                 RETURN(-EPROTO);
236         }
237
238         RETURN(0);
239 }
240
241 static int tgt_ost_body_unpack(struct tgt_session_info *tsi, __u32 flags)
242 {
243         struct ost_body         *body;
244         struct req_capsule      *pill = tsi->tsi_pill;
245         struct lu_nodemap       *nodemap;
246         int                      rc;
247
248         ENTRY;
249
250         body = req_capsule_client_get(pill, &RMF_OST_BODY);
251         if (body == NULL)
252                 RETURN(-EFAULT);
253
254         rc = tgt_validate_obdo(tsi, &body->oa);
255         if (rc)
256                 RETURN(rc);
257
258         nodemap = nodemap_get_from_exp(tsi->tsi_exp);
259         if (IS_ERR(nodemap))
260                 RETURN(PTR_ERR(nodemap));
261
262         body->oa.o_uid = nodemap_map_id(nodemap, NODEMAP_UID,
263                                         NODEMAP_CLIENT_TO_FS,
264                                         body->oa.o_uid);
265         body->oa.o_gid = nodemap_map_id(nodemap, NODEMAP_GID,
266                                         NODEMAP_CLIENT_TO_FS,
267                                         body->oa.o_gid);
268         nodemap_putref(nodemap);
269
270         tsi->tsi_ost_body = body;
271         tsi->tsi_fid = body->oa.o_oi.oi_fid;
272
273         if (req_capsule_has_field(pill, &RMF_OBD_IOOBJ, RCL_CLIENT)) {
274                 rc = tgt_io_data_unpack(tsi, &body->oa.o_oi);
275                 if (rc < 0)
276                         RETURN(rc);
277         }
278
279         if (!(body->oa.o_valid & OBD_MD_FLID)) {
280                 if (flags & HAS_BODY) {
281                         CERROR("%s: OBD_MD_FLID flag is not set in ost_body but OID/FID is mandatory with HAS_BODY\n",
282                                tgt_name(tsi->tsi_tgt));
283                         RETURN(-EPROTO);
284                 } else {
285                         RETURN(0);
286                 }
287         }
288
289         ost_fid_build_resid(&tsi->tsi_fid, &tsi->tsi_resid);
290
291         /*
292          * OST doesn't get object in advance for further use to prevent
293          * situations with nested object_find which is potential deadlock.
294          */
295         tsi->tsi_corpus = NULL;
296         RETURN(rc);
297 }
298
299 /*
300  * Do necessary preprocessing according to handler ->th_flags.
301  */
302 static int tgt_request_preprocess(struct tgt_session_info *tsi,
303                                   struct tgt_handler *h,
304                                   struct ptlrpc_request *req)
305 {
306         struct req_capsule      *pill = tsi->tsi_pill;
307         __u32                    flags = h->th_flags;
308         int                      rc = 0;
309
310         ENTRY;
311
312         if (tsi->tsi_preprocessed)
313                 RETURN(0);
314
315         LASSERT(h->th_act != NULL);
316         LASSERT(h->th_opc == lustre_msg_get_opc(req->rq_reqmsg));
317         LASSERT(current->journal_info == NULL);
318
319         LASSERT(ergo(flags & (HAS_BODY | HAS_REPLY),
320                      h->th_fmt != NULL));
321         if (h->th_fmt != NULL) {
322                 req_capsule_set(pill, h->th_fmt);
323                 if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT) &&
324                     req_capsule_field_present(pill, &RMF_MDT_BODY,
325                                               RCL_CLIENT)) {
326                         rc = tgt_mdt_body_unpack(tsi, flags);
327                         if (rc < 0)
328                                 RETURN(rc);
329                 } else if (req_capsule_has_field(pill, &RMF_OST_BODY,
330                                                  RCL_CLIENT) &&
331                            req_capsule_field_present(pill, &RMF_OST_BODY,
332                                                  RCL_CLIENT)) {
333                         rc = tgt_ost_body_unpack(tsi, flags);
334                         if (rc < 0)
335                                 RETURN(rc);
336                 }
337         }
338
339         if (flags & IS_MUTABLE && tgt_conn_flags(tsi) & OBD_CONNECT_RDONLY)
340                 RETURN(-EROFS);
341
342         if (flags & HAS_KEY) {
343                 struct ldlm_request *dlm_req;
344
345                 LASSERT(h->th_fmt != NULL);
346
347                 dlm_req = req_capsule_client_get(pill, &RMF_DLM_REQ);
348                 if (dlm_req != NULL) {
349                         union ldlm_wire_policy_data *policy =
350                                         &dlm_req->lock_desc.l_policy_data;
351
352                         if (unlikely(dlm_req->lock_desc.l_resource.lr_type ==
353                                      LDLM_IBITS &&
354                                      (policy->l_inodebits.bits |
355                                       policy->l_inodebits.try_bits) == 0)) {
356                                 /*
357                                  * Lock without inodebits makes no sense and
358                                  * will oops later in ldlm. If client miss to
359                                  * set such bits, do not trigger ASSERTION.
360                                  *
361                                  * For liblustre flock case, it maybe zero.
362                                  */
363                                 rc = -EPROTO;
364                         } else {
365                                 tsi->tsi_dlm_req = dlm_req;
366                         }
367                 } else {
368                         rc = -EFAULT;
369                 }
370         }
371         tsi->tsi_preprocessed = 1;
372         RETURN(rc);
373 }
374
375 /*
376  * Invoke handler for this request opc. Also do necessary preprocessing
377  * (according to handler ->th_flags), and post-processing (setting of
378  * ->last_{xid,committed}).
379  */
380 static int tgt_handle_request0(struct tgt_session_info *tsi,
381                                struct tgt_handler *h,
382                                struct ptlrpc_request *req)
383 {
384         int      serious = 0;
385         int      rc;
386         __u32    opc = lustre_msg_get_opc(req->rq_reqmsg);
387
388         ENTRY;
389
390
391         /* When dealing with sec context requests, no export is associated yet,
392          * because these requests are sent before *_CONNECT requests.
393          * A NULL req->rq_export means the normal *_common_slice handlers will
394          * not be called, because there is no reference to the target.
395          * So deal with them by hand and jump directly to target_send_reply().
396          */
397         switch (opc) {
398         case SEC_CTX_INIT:
399         case SEC_CTX_INIT_CONT:
400         case SEC_CTX_FINI:
401                 CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
402                 GOTO(out, rc = 0);
403         }
404
405         /*
406          * Checking for various OBD_FAIL_$PREF_$OPC_NET codes. _Do_ not try
407          * to put same checks into handlers like mdt_close(), mdt_reint(),
408          * etc., without talking to mdt authors first. Checking same thing
409          * there again is useless and returning 0 error without packing reply
410          * is buggy! Handlers either pack reply or return error.
411          *
412          * We return 0 here and do not send any reply in order to emulate
413          * network failure. Do not send any reply in case any of NET related
414          * fail_id has occured.
415          */
416         if (OBD_FAIL_CHECK_ORSET(h->th_fail_id, OBD_FAIL_ONCE))
417                 RETURN(0);
418         if (unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
419                      OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET)))
420                 RETURN(0);
421
422         /* drop OUT_UPDATE rpc */
423         if (unlikely(lustre_msg_get_opc(req->rq_reqmsg) == OUT_UPDATE &&
424                      OBD_FAIL_CHECK(OBD_FAIL_OUT_UPDATE_DROP)))
425                 RETURN(0);
426
427         rc = tgt_request_preprocess(tsi, h, req);
428         /* pack reply if reply format is fixed */
429         if (rc == 0 && h->th_flags & HAS_REPLY) {
430                 /* Pack reply */
431                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_MDT_MD,
432                                           RCL_SERVER))
433                         req_capsule_set_size(tsi->tsi_pill, &RMF_MDT_MD,
434                                              RCL_SERVER,
435                                              tsi->tsi_mdt_body->mbo_eadatasize);
436                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_LOGCOOKIES,
437                                           RCL_SERVER))
438                         req_capsule_set_size(tsi->tsi_pill, &RMF_LOGCOOKIES,
439                                              RCL_SERVER, 0);
440                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_ACL, RCL_SERVER))
441                         req_capsule_set_size(tsi->tsi_pill,
442                                              &RMF_ACL, RCL_SERVER,
443                                              LUSTRE_POSIX_ACL_MAX_SIZE_OLD);
444
445                 if (req_capsule_has_field(tsi->tsi_pill, &RMF_SHORT_IO,
446                                           RCL_SERVER)) {
447                         struct niobuf_remote *remote_nb =
448                                 req_capsule_client_get(tsi->tsi_pill,
449                                                        &RMF_NIOBUF_REMOTE);
450                         struct ost_body *body = tsi->tsi_ost_body;
451
452                         req_capsule_set_size(tsi->tsi_pill, &RMF_SHORT_IO,
453                                          RCL_SERVER,
454                                          (body->oa.o_valid & OBD_MD_FLFLAGS &&
455                                           body->oa.o_flags & OBD_FL_SHORT_IO) ?
456                                          remote_nb[0].rnb_len : 0);
457                 }
458
459                 rc = req_capsule_server_pack(tsi->tsi_pill);
460         }
461
462         if (likely(rc == 0)) {
463                 /*
464                  * Process request, there can be two types of rc:
465                  * 1) errors with msg unpack/pack, other failures outside the
466                  * operation itself. This is counted as serious errors;
467                  * 2) errors during fs operation, should be placed in rq_status
468                  * only
469                  */
470                 rc = h->th_act(tsi);
471                 if (!is_serious(rc) &&
472                     !req->rq_no_reply && req->rq_reply_state == NULL) {
473                         DEBUG_REQ(D_ERROR, req,
474                                   "%s: %s handler did not pack reply but returned no error",
475                                   tgt_name(tsi->tsi_tgt), h->th_name);
476                         LBUG();
477                 }
478                 serious = is_serious(rc);
479                 rc = clear_serious(rc);
480         } else {
481                 serious = 1;
482         }
483
484         req->rq_status = rc;
485
486         /*
487          * ELDLM_* codes which > 0 should be in rq_status only as well as
488          * all non-serious errors.
489          */
490         if (rc > 0 || !serious)
491                 rc = 0;
492
493         LASSERT(current->journal_info == NULL);
494
495         if (likely(rc == 0 && req->rq_export))
496                 target_committed_to_req(req);
497
498 out:
499         target_send_reply(req, rc, tsi->tsi_reply_fail_id);
500         RETURN(0);
501 }
502
503 static int tgt_filter_recovery_request(struct ptlrpc_request *req,
504                                        struct obd_device *obd, int *process)
505 {
506         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
507         case MDS_DISCONNECT:
508         case OST_DISCONNECT:
509         case OBD_IDX_READ:
510                 *process = 1;
511                 RETURN(0);
512         case MDS_CLOSE:
513         case MDS_SYNC: /* used in unmounting */
514         case OBD_PING:
515         case MDS_REINT:
516         case OUT_UPDATE:
517         case SEQ_QUERY:
518         case FLD_QUERY:
519         case FLD_READ:
520         case LDLM_ENQUEUE:
521         case OST_CREATE:
522         case OST_DESTROY:
523         case OST_PUNCH:
524         case OST_SETATTR:
525         case OST_SYNC:
526         case OST_WRITE:
527         case MDS_HSM_PROGRESS:
528         case MDS_HSM_STATE_SET:
529         case MDS_HSM_REQUEST:
530         case OST_FALLOCATE:
531                 *process = target_queue_recovery_request(req, obd);
532                 RETURN(0);
533
534         default:
535                 DEBUG_REQ(D_ERROR, req, "not permitted during recovery");
536                 *process = -EAGAIN;
537                 RETURN(0);
538         }
539 }
540
541 /*
542  * Handle recovery. Return:
543  *        +1: continue request processing;
544  *       -ve: abort immediately with the given error code;
545  *         0: send reply with error code in req->rq_status;
546  */
547 static int tgt_handle_recovery(struct ptlrpc_request *req, int reply_fail_id)
548 {
549         ENTRY;
550
551         switch (lustre_msg_get_opc(req->rq_reqmsg)) {
552         case MDS_CONNECT:
553         case OST_CONNECT:
554         case MGS_CONNECT:
555         case SEC_CTX_INIT:
556         case SEC_CTX_INIT_CONT:
557         case SEC_CTX_FINI:
558                 RETURN(+1);
559         }
560
561         if (!req->rq_export->exp_obd->obd_replayable)
562                 RETURN(+1);
563
564         /* sanity check: if the xid matches, the request must be marked as a
565          * resent or replayed */
566         if (req_can_reconstruct(req, NULL) == 1) {
567                 if (!(lustre_msg_get_flags(req->rq_reqmsg) &
568                       (MSG_RESENT | MSG_REPLAY))) {
569                         DEBUG_REQ(D_WARNING, req,
570                                   "rq_xid=%llu matches saved XID, expected REPLAY or RESENT flag (%x)",
571                                   req->rq_xid,
572                                   lustre_msg_get_flags(req->rq_reqmsg));
573                         req->rq_status = -ENOTCONN;
574                         RETURN(-ENOTCONN);
575                 }
576         }
577         /* else: note the opposite is not always true; a RESENT req after a
578          * failover will usually not match the last_xid, since it was likely
579          * never committed. A REPLAYed request will almost never match the
580          * last xid, however it could for a committed, but still retained,
581          * open. */
582
583         /* Check for aborted recovery... */
584         if (unlikely(req->rq_export->exp_obd->obd_recovering)) {
585                 int rc;
586                 int should_process;
587
588                 DEBUG_REQ(D_INFO, req, "Got new replay");
589                 rc = tgt_filter_recovery_request(req, req->rq_export->exp_obd,
590                                                  &should_process);
591                 if (rc != 0 || !should_process)
592                         RETURN(rc);
593                 else if (should_process < 0) {
594                         req->rq_status = should_process;
595                         rc = ptlrpc_error(req);
596                         RETURN(rc);
597                 }
598         }
599         RETURN(+1);
600 }
601
602 /* Initial check for request, it is validation mostly */
603 static struct tgt_handler *tgt_handler_find_check(struct ptlrpc_request *req)
604 {
605         struct tgt_handler      *h;
606         struct tgt_opc_slice    *s;
607         struct lu_target        *tgt;
608         __u32                    opc = lustre_msg_get_opc(req->rq_reqmsg);
609
610         ENTRY;
611
612         tgt = class_exp2tgt(req->rq_export);
613         if (unlikely(tgt == NULL)) {
614                 DEBUG_REQ(D_ERROR, req, "%s: no target for connected export",
615                           class_exp2obd(req->rq_export)->obd_name);
616                 RETURN(ERR_PTR(-EINVAL));
617         }
618
619         for (s = tgt->lut_slice; s->tos_hs != NULL; s++)
620                 if (s->tos_opc_start <= opc && opc < s->tos_opc_end)
621                         break;
622
623         /* opcode was not found in slice */
624         if (unlikely(s->tos_hs == NULL)) {
625                 static bool printed;
626
627                 /* don't spew error messages for unhandled RPCs */
628                 if (!printed) {
629                         CERROR("%s: no handler for opcode 0x%x from %s\n",
630                                tgt_name(tgt), opc, libcfs_id2str(req->rq_peer));
631                         printed = true;
632                 }
633                 RETURN(ERR_PTR(-ENOTSUPP));
634         }
635
636         LASSERT(opc >= s->tos_opc_start && opc < s->tos_opc_end);
637         h = s->tos_hs + (opc - s->tos_opc_start);
638         if (unlikely(h->th_opc == 0)) {
639                 CERROR("%s: unsupported opcode 0x%x\n", tgt_name(tgt), opc);
640                 RETURN(ERR_PTR(-ENOTSUPP));
641         }
642
643         RETURN(h);
644 }
645
646 static int process_req_last_xid(struct ptlrpc_request *req)
647 {
648         __u64   last_xid;
649         int rc = 0;
650         struct obd_export *exp = req->rq_export;
651         struct tg_export_data *ted = &exp->exp_target_data;
652         bool need_lock = tgt_is_multimodrpcs_client(exp);
653         ENTRY;
654
655         if (need_lock)
656                 mutex_lock(&ted->ted_lcd_lock);
657         /* check request's xid is consistent with export's last_xid */
658         last_xid = lustre_msg_get_last_xid(req->rq_reqmsg);
659         if (last_xid > exp->exp_last_xid)
660                 exp->exp_last_xid = last_xid;
661
662         if (req->rq_xid == 0 || req->rq_xid <= exp->exp_last_xid) {
663                 /* Some request is allowed to be sent during replay,
664                  * such as OUT update requests, FLD requests, so it
665                  * is possible that replay requests has smaller XID
666                  * than the exp_last_xid.
667                  *
668                  * Some non-replay requests may have smaller XID as
669                  * well:
670                  *
671                  * - Client send a no_resend RPC, like statfs;
672                  * - The RPC timedout (or some other error) on client,
673                  *   then it's removed from the unreplied list;
674                  * - Client send some other request to bump the
675                  *   exp_last_xid on server;
676                  * - The former RPC got chance to be processed;
677                  */
678                 if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY))
679                         rc = -EPROTO;
680
681                 DEBUG_REQ(D_WARNING, req,
682                           "unexpected xid=%llx != exp_last_xid=%llx, rc = %d",
683                           req->rq_xid, exp->exp_last_xid, rc);
684                 if (rc)
685                         GOTO(out, rc);
686         }
687
688         /* The "last_xid" is the minimum xid among unreplied requests,
689          * if the request is from the previous connection, its xid can
690          * still be larger than "exp_last_xid", then the above check of
691          * xid is not enough to determine whether the request is delayed.
692          *
693          * For example, if some replay request was delayed and caused
694          * timeout at client and the replay is restarted, the delayed
695          * replay request will have the larger xid than "exp_last_xid"
696          */
697         if (req->rq_export->exp_conn_cnt >
698             lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
699                 CDEBUG(D_RPCTRACE,
700                        "Dropping request %llu from an old epoch %u/%u\n",
701                        req->rq_xid,
702                        lustre_msg_get_conn_cnt(req->rq_reqmsg),
703                        req->rq_export->exp_conn_cnt);
704                 req->rq_no_reply = 1;
705                 GOTO(out, rc = -ESTALE);
706         }
707
708         /* try to release in-memory reply data */
709         if (tgt_is_multimodrpcs_client(exp)) {
710                 tgt_handle_received_xid(exp, last_xid);
711                 rc = tgt_handle_tag(req);
712         }
713
714 out:
715         if (need_lock)
716                 mutex_unlock(&ted->ted_lcd_lock);
717
718         RETURN(rc);
719 }
720
721 int tgt_request_handle(struct ptlrpc_request *req)
722 {
723         struct tgt_session_info *tsi = tgt_ses_info(req->rq_svc_thread->t_env);
724
725         struct lustre_msg       *msg = req->rq_reqmsg;
726         struct tgt_handler      *h;
727         struct lu_target        *tgt;
728         int                      request_fail_id = 0;
729         __u32                    opc = lustre_msg_get_opc(msg);
730         struct obd_device       *obd;
731         int                      rc;
732         bool                     is_connect = false;
733         ENTRY;
734
735         if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_TGT_RECOVERY_REQ_RACE))) {
736                 if (cfs_fail_val == 0 &&
737                     lustre_msg_get_opc(msg) != OBD_PING &&
738                     lustre_msg_get_flags(msg) & MSG_REQ_REPLAY_DONE) {
739                         cfs_fail_val = 1;
740                         cfs_race_state = 0;
741                         wait_event_idle(cfs_race_waitq, (cfs_race_state == 1));
742                 }
743         }
744
745         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
746         tsi->tsi_pill = &req->rq_pill;
747         tsi->tsi_env = req->rq_svc_thread->t_env;
748
749         /* if request has export then get handlers slice from corresponding
750          * target, otherwise that should be connect operation */
751         if (opc == MDS_CONNECT || opc == OST_CONNECT ||
752             opc == MGS_CONNECT) {
753                 is_connect = true;
754                 req_capsule_set(&req->rq_pill, &RQF_CONNECT);
755                 rc = target_handle_connect(req);
756                 if (rc != 0) {
757                         rc = ptlrpc_error(req);
758                         GOTO(out, rc);
759                 }
760                 /* recovery-small test 18c asks to drop connect reply */
761                 if (unlikely(opc == OST_CONNECT &&
762                              OBD_FAIL_CHECK(OBD_FAIL_OST_CONNECT_NET2)))
763                         GOTO(out, rc = 0);
764         }
765
766         if (unlikely(!class_connected_export(req->rq_export))) {
767                 if (opc == SEC_CTX_INIT || opc == SEC_CTX_INIT_CONT ||
768                     opc == SEC_CTX_FINI) {
769                         /* sec context initialization has to be handled
770                          * by hand in tgt_handle_request0() */
771                         tsi->tsi_reply_fail_id = OBD_FAIL_SEC_CTX_INIT_NET;
772                         h = NULL;
773                         GOTO(handle_recov, rc = 0);
774                 }
775                 CDEBUG(D_HA, "operation %d on unconnected OST from %s\n",
776                        opc, libcfs_id2str(req->rq_peer));
777                 req->rq_status = -ENOTCONN;
778                 rc = ptlrpc_error(req);
779                 GOTO(out, rc);
780         }
781
782         tsi->tsi_tgt = tgt = class_exp2tgt(req->rq_export);
783         tsi->tsi_exp = req->rq_export;
784         if (exp_connect_flags(req->rq_export) & OBD_CONNECT_JOBSTATS)
785                 tsi->tsi_jobid = lustre_msg_get_jobid(req->rq_reqmsg);
786         else
787                 tsi->tsi_jobid = NULL;
788
789         if (tgt == NULL) {
790                 DEBUG_REQ(D_ERROR, req, "%s: No target for connected export",
791                           class_exp2obd(req->rq_export)->obd_name);
792                 req->rq_status = -EINVAL;
793                 rc = ptlrpc_error(req);
794                 GOTO(out, rc);
795         }
796
797         /* Skip last_xid processing for the recovery thread, otherwise, the
798          * last_xid on same request could be processed twice: first time when
799          * processing the incoming request, second time when the request is
800          * being processed by recovery thread. */
801         obd = class_exp2obd(req->rq_export);
802         if (is_connect) {
803                 /* reset the exp_last_xid on each connection. */
804                 req->rq_export->exp_last_xid = 0;
805         } else if (obd->obd_recovery_data.trd_processing_task !=
806                    current->pid) {
807                 rc = process_req_last_xid(req);
808                 if (rc) {
809                         req->rq_status = rc;
810                         rc = ptlrpc_error(req);
811                         GOTO(out, rc);
812                 }
813         }
814
815         request_fail_id = tgt->lut_request_fail_id;
816         tsi->tsi_reply_fail_id = tgt->lut_reply_fail_id;
817
818         h = tgt_handler_find_check(req);
819         if (IS_ERR(h)) {
820                 req->rq_status = PTR_ERR(h);
821                 rc = ptlrpc_error(req);
822                 GOTO(out, rc);
823         }
824
825         LASSERTF(h->th_opc == opc, "opcode mismatch %d != %d\n",
826                  h->th_opc, opc);
827
828         if ((cfs_fail_val == 0 || cfs_fail_val == opc) &&
829              CFS_FAIL_CHECK_ORSET(request_fail_id, CFS_FAIL_ONCE))
830                 GOTO(out, rc = 0);
831
832         rc = lustre_msg_check_version(msg, h->th_version);
833         if (unlikely(rc)) {
834                 DEBUG_REQ(D_ERROR, req,
835                           "%s: drop malformed request version=%08x expect=%08x",
836                           tgt_name(tgt), lustre_msg_get_version(msg),
837                           h->th_version);
838                 req->rq_status = -EINVAL;
839                 rc = ptlrpc_error(req);
840                 GOTO(out, rc);
841         }
842
843 handle_recov:
844         rc = tgt_handle_recovery(req, tsi->tsi_reply_fail_id);
845         if (likely(rc == 1)) {
846                 rc = tgt_handle_request0(tsi, h, req);
847                 if (rc)
848                         GOTO(out, rc);
849         }
850         EXIT;
851 out:
852         req_capsule_fini(tsi->tsi_pill);
853         if (tsi->tsi_corpus != NULL) {
854                 lu_object_put(tsi->tsi_env, tsi->tsi_corpus);
855                 tsi->tsi_corpus = NULL;
856         }
857         return rc;
858 }
859 EXPORT_SYMBOL(tgt_request_handle);
860
861 /** Assign high priority operations to the request if needed. */
862 int tgt_hpreq_handler(struct ptlrpc_request *req)
863 {
864         struct tgt_session_info *tsi = tgt_ses_info(req->rq_svc_thread->t_env);
865         struct tgt_handler      *h;
866         int                      rc;
867
868         ENTRY;
869
870         if (req->rq_export == NULL)
871                 RETURN(0);
872
873         req_capsule_init(&req->rq_pill, req, RCL_SERVER);
874         tsi->tsi_pill = &req->rq_pill;
875         tsi->tsi_env = req->rq_svc_thread->t_env;
876         tsi->tsi_tgt = class_exp2tgt(req->rq_export);
877         tsi->tsi_exp = req->rq_export;
878
879         h = tgt_handler_find_check(req);
880         if (IS_ERR(h)) {
881                 rc = PTR_ERR(h);
882                 RETURN(rc);
883         }
884
885         rc = tgt_request_preprocess(tsi, h, req);
886         if (unlikely(rc != 0))
887                 RETURN(rc);
888
889         if (h->th_hp != NULL)
890                 h->th_hp(tsi);
891         RETURN(0);
892 }
893 EXPORT_SYMBOL(tgt_hpreq_handler);
894
895 void tgt_counter_incr(struct obd_export *exp, int opcode)
896 {
897         lprocfs_counter_incr(exp->exp_obd->obd_stats, opcode);
898         if (exp->exp_nid_stats && exp->exp_nid_stats->nid_stats != NULL)
899                 lprocfs_counter_incr(exp->exp_nid_stats->nid_stats, opcode);
900 }
901 EXPORT_SYMBOL(tgt_counter_incr);
902
903 /*
904  * Unified target generic handlers.
905  */
906
907 int tgt_connect_check_sptlrpc(struct ptlrpc_request *req, struct obd_export *exp)
908 {
909         struct lu_target *tgt = class_exp2tgt(exp);
910         struct sptlrpc_flavor flvr;
911         int rc = 0;
912
913         LASSERT(tgt);
914         LASSERT(tgt->lut_obd);
915         LASSERT(tgt->lut_slice);
916
917         /* always allow ECHO client */
918         if (unlikely(strcmp(exp->exp_obd->obd_type->typ_name,
919                             LUSTRE_ECHO_NAME) == 0)) {
920                 exp->exp_flvr.sf_rpc = SPTLRPC_FLVR_ANY;
921                 return 0;
922         }
923
924         if (exp->exp_flvr.sf_rpc == SPTLRPC_FLVR_INVALID) {
925                 read_lock(&tgt->lut_sptlrpc_lock);
926                 sptlrpc_target_choose_flavor(&tgt->lut_sptlrpc_rset,
927                                              req->rq_sp_from,
928                                              req->rq_peer.nid,
929                                              &flvr);
930                 read_unlock(&tgt->lut_sptlrpc_lock);
931
932                 spin_lock(&exp->exp_lock);
933                 exp->exp_sp_peer = req->rq_sp_from;
934                 exp->exp_flvr = flvr;
935
936                 /* when on mgs, if no restriction is set, or if the client
937                  * NID is on the local node, allow any flavor
938                  */
939                 if ((strcmp(exp->exp_obd->obd_type->typ_name,
940                            LUSTRE_MGS_NAME) == 0) &&
941                      (exp->exp_flvr.sf_rpc == SPTLRPC_FLVR_NULL ||
942                       LNetIsPeerLocal(exp->exp_connection->c_peer.nid)))
943                         exp->exp_flvr.sf_rpc = SPTLRPC_FLVR_ANY;
944
945                 if (exp->exp_flvr.sf_rpc != SPTLRPC_FLVR_ANY &&
946                     exp->exp_flvr.sf_rpc != req->rq_flvr.sf_rpc) {
947                         CERROR("%s: unauthorized rpc flavor %x from %s, "
948                                "expect %x\n", tgt_name(tgt),
949                                req->rq_flvr.sf_rpc,
950                                libcfs_nid2str(req->rq_peer.nid),
951                                exp->exp_flvr.sf_rpc);
952                         rc = -EACCES;
953                 }
954                 spin_unlock(&exp->exp_lock);
955         } else {
956                 if (exp->exp_sp_peer != req->rq_sp_from) {
957                         CERROR("%s: RPC source %s doesn't match %s\n",
958                                tgt_name(tgt),
959                                sptlrpc_part2name(req->rq_sp_from),
960                                sptlrpc_part2name(exp->exp_sp_peer));
961                         rc = -EACCES;
962                 } else {
963                         rc = sptlrpc_target_export_check(exp, req);
964                 }
965         }
966
967         return rc;
968 }
969
970 int tgt_adapt_sptlrpc_conf(struct lu_target *tgt)
971 {
972         struct sptlrpc_rule_set  tmp_rset;
973         int                      rc;
974
975         if (unlikely(tgt == NULL)) {
976                 CERROR("No target passed\n");
977                 return -EINVAL;
978         }
979
980         sptlrpc_rule_set_init(&tmp_rset);
981         rc = sptlrpc_conf_target_get_rules(tgt->lut_obd, &tmp_rset);
982         if (rc) {
983                 CERROR("%s: failed get sptlrpc rules: rc = %d\n",
984                        tgt_name(tgt), rc);
985                 return rc;
986         }
987
988         sptlrpc_target_update_exp_flavor(tgt->lut_obd, &tmp_rset);
989
990         write_lock(&tgt->lut_sptlrpc_lock);
991         sptlrpc_rule_set_free(&tgt->lut_sptlrpc_rset);
992         tgt->lut_sptlrpc_rset = tmp_rset;
993         write_unlock(&tgt->lut_sptlrpc_lock);
994
995         return 0;
996 }
997 EXPORT_SYMBOL(tgt_adapt_sptlrpc_conf);
998
999 int tgt_connect(struct tgt_session_info *tsi)
1000 {
1001         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1002         struct obd_connect_data *reply;
1003         int                      rc;
1004
1005         ENTRY;
1006
1007         /* XXX: better to call this check right after getting new export but
1008          * before last_rcvd slot allocation to avoid server load upon insecure
1009          * connects. This is to be fixed after unifiyng all targets.
1010          */
1011         rc = tgt_connect_check_sptlrpc(req, tsi->tsi_exp);
1012         if (rc)
1013                 GOTO(out, rc);
1014
1015         /* To avoid exposing partially initialized connection flags, changes up
1016          * to this point have been staged in reply->ocd_connect_flags. Now that
1017          * connection handling has completed successfully, atomically update
1018          * the connect flags in the shared export data structure. LU-1623 */
1019         reply = req_capsule_server_get(tsi->tsi_pill, &RMF_CONNECT_DATA);
1020         spin_lock(&tsi->tsi_exp->exp_lock);
1021         *exp_connect_flags_ptr(tsi->tsi_exp) = reply->ocd_connect_flags;
1022         if (reply->ocd_connect_flags & OBD_CONNECT_FLAGS2)
1023                 *exp_connect_flags2_ptr(tsi->tsi_exp) =
1024                         reply->ocd_connect_flags2;
1025         tsi->tsi_exp->exp_connect_data.ocd_brw_size = reply->ocd_brw_size;
1026         spin_unlock(&tsi->tsi_exp->exp_lock);
1027
1028         if (strcmp(tsi->tsi_exp->exp_obd->obd_type->typ_name,
1029                    LUSTRE_MDT_NAME) == 0) {
1030                 rc = req_check_sepol(tsi->tsi_pill);
1031                 if (rc)
1032                         GOTO(out, rc);
1033
1034                 if (reply->ocd_connect_flags & OBD_CONNECT_FLAGS2 &&
1035                     reply->ocd_connect_flags2 & OBD_CONNECT2_ENCRYPT &&
1036                     tsi->tsi_pill->rc_req->rq_export) {
1037                         bool forbid_encrypt = true;
1038                         struct lu_nodemap *nm =
1039                          nodemap_get_from_exp(tsi->tsi_pill->rc_req->rq_export);
1040
1041                         if (!nm) {
1042                                 /* nodemap_get_from_exp returns NULL in case
1043                                  * nodemap is not active, so we do not forbid
1044                                  */
1045                                 forbid_encrypt = false;
1046                         } else if (!IS_ERR(nm)) {
1047                                 forbid_encrypt = nm->nmf_forbid_encryption;
1048                                 nodemap_putref(nm);
1049                         }
1050
1051                         if (forbid_encrypt)
1052                                 GOTO(out, rc = -EACCES);
1053                 }
1054         }
1055
1056         RETURN(0);
1057 out:
1058         obd_disconnect(class_export_get(tsi->tsi_exp));
1059         return rc;
1060 }
1061 EXPORT_SYMBOL(tgt_connect);
1062
1063 int tgt_disconnect(struct tgt_session_info *tsi)
1064 {
1065         int rc;
1066
1067         ENTRY;
1068
1069         OBD_FAIL_TIMEOUT(OBD_FAIL_OST_DISCONNECT_DELAY, cfs_fail_val);
1070
1071         rc = target_handle_disconnect(tgt_ses_req(tsi));
1072         if (rc)
1073                 RETURN(err_serious(rc));
1074
1075         RETURN(rc);
1076 }
1077 EXPORT_SYMBOL(tgt_disconnect);
1078
1079 /*
1080  * Unified target OBD handlers
1081  */
1082 int tgt_obd_ping(struct tgt_session_info *tsi)
1083 {
1084         int rc;
1085
1086         ENTRY;
1087
1088         /* The target-specific part of OBD_PING request handling.
1089          * It controls Filter Modification Data (FMD) expiration each time
1090          * PING is received.
1091          *
1092          * Valid only for replayable targets, e.g. MDT and OFD
1093          */
1094         if (tsi->tsi_exp->exp_obd->obd_replayable)
1095                 tgt_fmd_expire(tsi->tsi_exp);
1096
1097         rc = req_capsule_server_pack(tsi->tsi_pill);
1098         if (rc)
1099                 RETURN(err_serious(rc));
1100
1101         RETURN(rc);
1102 }
1103 EXPORT_SYMBOL(tgt_obd_ping);
1104
1105 int tgt_obd_log_cancel(struct tgt_session_info *tsi)
1106 {
1107         return err_serious(-EOPNOTSUPP);
1108 }
1109
1110 int tgt_send_buffer(struct tgt_session_info *tsi, struct lu_rdbuf *rdbuf)
1111 {
1112         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1113         struct obd_export       *exp = req->rq_export;
1114         struct ptlrpc_bulk_desc *desc;
1115         int                      i;
1116         int                      rc;
1117         int                      pages = 0;
1118
1119         ENTRY;
1120
1121         for (i = 0; i < rdbuf->rb_nbufs; i++) {
1122                 unsigned int offset;
1123
1124                 offset = (unsigned long)rdbuf->rb_bufs[i].lb_buf & ~PAGE_MASK;
1125                 pages += DIV_ROUND_UP(rdbuf->rb_bufs[i].lb_len + offset,
1126                                       PAGE_SIZE);
1127         }
1128
1129         desc = ptlrpc_prep_bulk_exp(req, pages, 1,
1130                                   PTLRPC_BULK_PUT_SOURCE,
1131                                     MDS_BULK_PORTAL,
1132                                     &ptlrpc_bulk_kiov_nopin_ops);
1133         if (desc == NULL)
1134                 RETURN(-ENOMEM);
1135
1136         for (i = 0; i < rdbuf->rb_nbufs; i++)
1137                 desc->bd_frag_ops->add_iov_frag(desc,
1138                                         rdbuf->rb_bufs[i].lb_buf,
1139                                         rdbuf->rb_bufs[i].lb_len);
1140
1141         rc = target_bulk_io(exp, desc);
1142         ptlrpc_free_bulk(desc);
1143         RETURN(rc);
1144 }
1145 EXPORT_SYMBOL(tgt_send_buffer);
1146
1147 int tgt_sendpage(struct tgt_session_info *tsi, struct lu_rdpg *rdpg, int nob)
1148 {
1149         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1150         struct obd_export       *exp = req->rq_export;
1151         struct ptlrpc_bulk_desc *desc;
1152         int                      tmpcount;
1153         int                      tmpsize;
1154         int                      i;
1155         int                      rc;
1156
1157         ENTRY;
1158
1159         desc = ptlrpc_prep_bulk_exp(req, rdpg->rp_npages, 1,
1160                                     PTLRPC_BULK_PUT_SOURCE,
1161                                     MDS_BULK_PORTAL,
1162                                     &ptlrpc_bulk_kiov_pin_ops);
1163         if (desc == NULL)
1164                 RETURN(-ENOMEM);
1165
1166         if (!(exp_connect_flags(exp) & OBD_CONNECT_BRW_SIZE))
1167                 /* old client requires reply size in it's PAGE_SIZE,
1168                  * which is rdpg->rp_count */
1169                 nob = rdpg->rp_count;
1170
1171         for (i = 0, tmpcount = nob; i < rdpg->rp_npages && tmpcount > 0;
1172              i++, tmpcount -= tmpsize) {
1173                 tmpsize = min_t(int, tmpcount, PAGE_SIZE);
1174                 desc->bd_frag_ops->add_kiov_frag(desc, rdpg->rp_pages[i], 0,
1175                                                  tmpsize);
1176         }
1177
1178         LASSERT(desc->bd_nob == nob);
1179         rc = target_bulk_io(exp, desc);
1180         ptlrpc_free_bulk(desc);
1181         RETURN(rc);
1182 }
1183 EXPORT_SYMBOL(tgt_sendpage);
1184
1185 /*
1186  * OBD_IDX_READ handler
1187  */
1188 static int tgt_obd_idx_read(struct tgt_session_info *tsi)
1189 {
1190         struct tgt_thread_info  *tti = tgt_th_info(tsi->tsi_env);
1191         struct lu_rdpg          *rdpg = &tti->tti_u.rdpg.tti_rdpg;
1192         struct idx_info         *req_ii, *rep_ii;
1193         int                      rc, i;
1194
1195         ENTRY;
1196
1197         memset(rdpg, 0, sizeof(*rdpg));
1198         req_capsule_set(tsi->tsi_pill, &RQF_OBD_IDX_READ);
1199
1200         /* extract idx_info buffer from request & reply */
1201         req_ii = req_capsule_client_get(tsi->tsi_pill, &RMF_IDX_INFO);
1202         if (req_ii == NULL || req_ii->ii_magic != IDX_INFO_MAGIC)
1203                 RETURN(err_serious(-EPROTO));
1204
1205         rc = req_capsule_server_pack(tsi->tsi_pill);
1206         if (rc)
1207                 RETURN(err_serious(rc));
1208
1209         rep_ii = req_capsule_server_get(tsi->tsi_pill, &RMF_IDX_INFO);
1210         if (rep_ii == NULL)
1211                 RETURN(err_serious(-EFAULT));
1212         rep_ii->ii_magic = IDX_INFO_MAGIC;
1213
1214         /* extract hash to start with */
1215         rdpg->rp_hash = req_ii->ii_hash_start;
1216
1217         /* extract requested attributes */
1218         rdpg->rp_attrs = req_ii->ii_attrs;
1219
1220         /* check that fid packed in request is valid and supported */
1221         if (!fid_is_sane(&req_ii->ii_fid))
1222                 RETURN(-EINVAL);
1223         rep_ii->ii_fid = req_ii->ii_fid;
1224
1225         /* copy flags */
1226         rep_ii->ii_flags = req_ii->ii_flags;
1227
1228         /* compute number of pages to allocate, ii_count is the number of 4KB
1229          * containers */
1230         if (req_ii->ii_count <= 0)
1231                 GOTO(out, rc = -EFAULT);
1232         rdpg->rp_count = min_t(unsigned int, req_ii->ii_count << LU_PAGE_SHIFT,
1233                                exp_max_brw_size(tsi->tsi_exp));
1234         rdpg->rp_npages = (rdpg->rp_count + PAGE_SIZE - 1) >> PAGE_SHIFT;
1235
1236         /* allocate pages to store the containers */
1237         OBD_ALLOC_PTR_ARRAY(rdpg->rp_pages, rdpg->rp_npages);
1238         if (rdpg->rp_pages == NULL)
1239                 GOTO(out, rc = -ENOMEM);
1240         for (i = 0; i < rdpg->rp_npages; i++) {
1241                 rdpg->rp_pages[i] = alloc_page(GFP_NOFS);
1242                 if (rdpg->rp_pages[i] == NULL)
1243                         GOTO(out, rc = -ENOMEM);
1244         }
1245
1246         /* populate pages with key/record pairs */
1247         rc = dt_index_read(tsi->tsi_env, tsi->tsi_tgt->lut_bottom, rep_ii, rdpg);
1248         if (rc < 0)
1249                 GOTO(out, rc);
1250
1251         LASSERTF(rc <= rdpg->rp_count, "dt_index_read() returned more than "
1252                  "asked %d > %d\n", rc, rdpg->rp_count);
1253
1254         /* send pages to client */
1255         rc = tgt_sendpage(tsi, rdpg, rc);
1256         if (rc)
1257                 GOTO(out, rc);
1258         EXIT;
1259 out:
1260         if (rdpg->rp_pages) {
1261                 for (i = 0; i < rdpg->rp_npages; i++)
1262                         if (rdpg->rp_pages[i])
1263                                 __free_page(rdpg->rp_pages[i]);
1264                 OBD_FREE_PTR_ARRAY(rdpg->rp_pages, rdpg->rp_npages);
1265         }
1266         return rc;
1267 }
1268
1269 struct tgt_handler tgt_obd_handlers[] = {
1270 TGT_OBD_HDL    (0,      OBD_PING,               tgt_obd_ping),
1271 TGT_OBD_HDL    (0,      OBD_IDX_READ,           tgt_obd_idx_read)
1272 };
1273 EXPORT_SYMBOL(tgt_obd_handlers);
1274
1275 int tgt_sync(const struct lu_env *env, struct lu_target *tgt,
1276              struct dt_object *obj, __u64 start, __u64 end)
1277 {
1278         int rc = 0;
1279
1280         ENTRY;
1281
1282         /* if no objid is specified, it means "sync whole filesystem" */
1283         if (obj == NULL) {
1284                 rc = dt_sync(env, tgt->lut_bottom);
1285         } else if (dt_version_get(env, obj) >
1286                    tgt->lut_obd->obd_last_committed) {
1287                 rc = dt_object_sync(env, obj, start, end);
1288         }
1289         atomic_inc(&tgt->lut_sync_count);
1290
1291         RETURN(rc);
1292 }
1293 EXPORT_SYMBOL(tgt_sync);
1294 /*
1295  * Unified target DLM handlers.
1296  */
1297
1298 /**
1299  * Unified target BAST
1300  *
1301  * Ensure data and metadata are synced to disk when lock is canceled if Sync on
1302  * Cancel (SOC) is enabled. If it's extent lock, normally sync obj is enough,
1303  * but if it's cross-MDT lock, because remote object version is not set, a
1304  * filesystem sync is needed.
1305  *
1306  * \param lock server side lock
1307  * \param desc lock desc
1308  * \param data ldlm_cb_set_arg
1309  * \param flag  indicates whether this cancelling or blocking callback
1310  * \retval      0 on success
1311  * \retval      negative number on error
1312  */
1313 static int tgt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
1314                             void *data, int flag)
1315 {
1316         struct lu_env            env;
1317         struct lu_target        *tgt;
1318         struct dt_object        *obj = NULL;
1319         struct lu_fid            fid;
1320         int                      rc = 0;
1321
1322         ENTRY;
1323
1324         tgt = class_exp2tgt(lock->l_export);
1325
1326         if (unlikely(tgt == NULL)) {
1327                 CDEBUG(D_ERROR, "%s: No target for connected export\n",
1328                        class_exp2obd(lock->l_export)->obd_name);
1329                 RETURN(-EINVAL);
1330         }
1331
1332         if (flag == LDLM_CB_CANCELING &&
1333             (lock->l_granted_mode & (LCK_EX | LCK_PW | LCK_GROUP)) &&
1334             (tgt->lut_sync_lock_cancel == SYNC_LOCK_CANCEL_ALWAYS ||
1335              (tgt->lut_sync_lock_cancel == SYNC_LOCK_CANCEL_BLOCKING &&
1336               ldlm_is_cbpending(lock))) &&
1337             ((exp_connect_flags(lock->l_export) & OBD_CONNECT_MDS_MDS) ||
1338              lock->l_resource->lr_type == LDLM_EXTENT)) {
1339                 __u64 start = 0;
1340                 __u64 end = OBD_OBJECT_EOF;
1341
1342                 rc = lu_env_init(&env, LCT_DT_THREAD);
1343                 if (unlikely(rc != 0))
1344                         GOTO(err, rc);
1345
1346                 ost_fid_from_resid(&fid, &lock->l_resource->lr_name,
1347                                    tgt->lut_lsd.lsd_osd_index);
1348
1349                 if (lock->l_resource->lr_type == LDLM_EXTENT) {
1350                         obj = dt_locate(&env, tgt->lut_bottom, &fid);
1351                         if (IS_ERR(obj))
1352                                 GOTO(err_env, rc = PTR_ERR(obj));
1353
1354                         if (!dt_object_exists(obj))
1355                                 GOTO(err_put, rc = -ENOENT);
1356
1357                         start = lock->l_policy_data.l_extent.start;
1358                         end = lock->l_policy_data.l_extent.end;
1359                 }
1360
1361                 rc = tgt_sync(&env, tgt, obj, start, end);
1362                 if (rc < 0) {
1363                         CERROR("%s: syncing "DFID" (%llu-%llu) on lock "
1364                                "cancel: rc = %d\n",
1365                                tgt_name(tgt), PFID(&fid),
1366                                lock->l_policy_data.l_extent.start,
1367                                lock->l_policy_data.l_extent.end, rc);
1368                 }
1369 err_put:
1370                 if (obj != NULL)
1371                         dt_object_put(&env, obj);
1372 err_env:
1373                 lu_env_fini(&env);
1374         }
1375 err:
1376         rc = ldlm_server_blocking_ast(lock, desc, data, flag);
1377         RETURN(rc);
1378 }
1379
1380 static struct ldlm_callback_suite tgt_dlm_cbs = {
1381         .lcs_completion = ldlm_server_completion_ast,
1382         .lcs_blocking   = tgt_blocking_ast,
1383         .lcs_glimpse    = ldlm_server_glimpse_ast
1384 };
1385
1386 int tgt_enqueue(struct tgt_session_info *tsi)
1387 {
1388         struct ptlrpc_request *req = tgt_ses_req(tsi);
1389         int rc;
1390
1391         ENTRY;
1392         /*
1393          * tsi->tsi_dlm_req was already swapped and (if necessary) converted,
1394          * tsi->tsi_dlm_cbs was set by the *_req_handle() function.
1395          */
1396         LASSERT(tsi->tsi_dlm_req != NULL);
1397         rc = ldlm_handle_enqueue0(tsi->tsi_exp->exp_obd->obd_namespace, req,
1398                                   tsi->tsi_dlm_req, &tgt_dlm_cbs);
1399         if (rc)
1400                 RETURN(err_serious(rc));
1401
1402         switch (LUT_FAIL_CLASS(tsi->tsi_reply_fail_id)) {
1403         case LUT_FAIL_MDT:
1404                 tsi->tsi_reply_fail_id = OBD_FAIL_MDS_LDLM_REPLY_NET;
1405                 break;
1406         case LUT_FAIL_OST:
1407                 tsi->tsi_reply_fail_id = OBD_FAIL_OST_LDLM_REPLY_NET;
1408                 break;
1409         case LUT_FAIL_MGT:
1410                 tsi->tsi_reply_fail_id = OBD_FAIL_MGS_LDLM_REPLY_NET;
1411                 break;
1412         default:
1413                 tsi->tsi_reply_fail_id = OBD_FAIL_LDLM_REPLY;
1414                 break;
1415         }
1416         RETURN(req->rq_status);
1417 }
1418 EXPORT_SYMBOL(tgt_enqueue);
1419
1420 int tgt_convert(struct tgt_session_info *tsi)
1421 {
1422         struct ptlrpc_request *req = tgt_ses_req(tsi);
1423         int rc;
1424
1425         ENTRY;
1426         LASSERT(tsi->tsi_dlm_req);
1427         rc = ldlm_handle_convert0(req, tsi->tsi_dlm_req);
1428         if (rc)
1429                 RETURN(err_serious(rc));
1430
1431         RETURN(req->rq_status);
1432 }
1433
1434 int tgt_bl_callback(struct tgt_session_info *tsi)
1435 {
1436         return err_serious(-EOPNOTSUPP);
1437 }
1438
1439 int tgt_cp_callback(struct tgt_session_info *tsi)
1440 {
1441         return err_serious(-EOPNOTSUPP);
1442 }
1443
1444 /* generic LDLM target handler */
1445 struct tgt_handler tgt_dlm_handlers[] = {
1446 TGT_DLM_HDL(HAS_KEY, LDLM_ENQUEUE, tgt_enqueue),
1447 TGT_DLM_HDL(HAS_KEY, LDLM_CONVERT, tgt_convert),
1448 TGT_DLM_HDL_VAR(0, LDLM_BL_CALLBACK, tgt_bl_callback),
1449 TGT_DLM_HDL_VAR(0, LDLM_CP_CALLBACK, tgt_cp_callback)
1450 };
1451 EXPORT_SYMBOL(tgt_dlm_handlers);
1452
1453 /*
1454  * Unified target LLOG handlers.
1455  */
1456 int tgt_llog_open(struct tgt_session_info *tsi)
1457 {
1458         int rc;
1459
1460         ENTRY;
1461
1462         rc = llog_origin_handle_open(tgt_ses_req(tsi));
1463
1464         RETURN(rc);
1465 }
1466 EXPORT_SYMBOL(tgt_llog_open);
1467
1468 int tgt_llog_read_header(struct tgt_session_info *tsi)
1469 {
1470         int rc;
1471
1472         ENTRY;
1473
1474         rc = llog_origin_handle_read_header(tgt_ses_req(tsi));
1475
1476         RETURN(rc);
1477 }
1478 EXPORT_SYMBOL(tgt_llog_read_header);
1479
1480 int tgt_llog_next_block(struct tgt_session_info *tsi)
1481 {
1482         int rc;
1483
1484         ENTRY;
1485
1486         rc = llog_origin_handle_next_block(tgt_ses_req(tsi));
1487
1488         RETURN(rc);
1489 }
1490 EXPORT_SYMBOL(tgt_llog_next_block);
1491
1492 int tgt_llog_prev_block(struct tgt_session_info *tsi)
1493 {
1494         int rc;
1495
1496         ENTRY;
1497
1498         rc = llog_origin_handle_prev_block(tgt_ses_req(tsi));
1499
1500         RETURN(rc);
1501 }
1502 EXPORT_SYMBOL(tgt_llog_prev_block);
1503
1504 /* generic llog target handler */
1505 struct tgt_handler tgt_llog_handlers[] = {
1506 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_CREATE,      tgt_llog_open),
1507 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_NEXT_BLOCK,  tgt_llog_next_block),
1508 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_READ_HEADER, tgt_llog_read_header),
1509 TGT_LLOG_HDL    (0,     LLOG_ORIGIN_HANDLE_PREV_BLOCK,  tgt_llog_prev_block),
1510 };
1511 EXPORT_SYMBOL(tgt_llog_handlers);
1512
1513 /*
1514  * sec context handlers
1515  */
1516 /* XXX: Implement based on mdt_sec_ctx_handle()? */
1517 static int tgt_sec_ctx_handle(struct tgt_session_info *tsi)
1518 {
1519         return 0;
1520 }
1521
1522 struct tgt_handler tgt_sec_ctx_handlers[] = {
1523 TGT_SEC_HDL_VAR(0,      SEC_CTX_INIT,           tgt_sec_ctx_handle),
1524 TGT_SEC_HDL_VAR(0,      SEC_CTX_INIT_CONT,      tgt_sec_ctx_handle),
1525 TGT_SEC_HDL_VAR(0,      SEC_CTX_FINI,           tgt_sec_ctx_handle),
1526 };
1527 EXPORT_SYMBOL(tgt_sec_ctx_handlers);
1528
1529 int (*tgt_lfsck_in_notify_local)(const struct lu_env *env,
1530                                  struct dt_device *key,
1531                                  struct lfsck_req_local *lrl,
1532                                  struct thandle *th) = NULL;
1533
1534 void tgt_register_lfsck_in_notify_local(int (*notify)(const struct lu_env *,
1535                                                       struct dt_device *,
1536                                                       struct lfsck_req_local *,
1537                                                       struct thandle *))
1538 {
1539         tgt_lfsck_in_notify_local = notify;
1540 }
1541 EXPORT_SYMBOL(tgt_register_lfsck_in_notify_local);
1542
1543 int (*tgt_lfsck_in_notify)(const struct lu_env *env,
1544                            struct dt_device *key,
1545                            struct lfsck_request *lr) = NULL;
1546
1547 void tgt_register_lfsck_in_notify(int (*notify)(const struct lu_env *,
1548                                                 struct dt_device *,
1549                                                 struct lfsck_request *))
1550 {
1551         tgt_lfsck_in_notify = notify;
1552 }
1553 EXPORT_SYMBOL(tgt_register_lfsck_in_notify);
1554
1555 static int (*tgt_lfsck_query)(const struct lu_env *env,
1556                               struct dt_device *key,
1557                               struct lfsck_request *req,
1558                               struct lfsck_reply *rep,
1559                               struct lfsck_query *que) = NULL;
1560
1561 void tgt_register_lfsck_query(int (*query)(const struct lu_env *,
1562                                            struct dt_device *,
1563                                            struct lfsck_request *,
1564                                            struct lfsck_reply *,
1565                                            struct lfsck_query *))
1566 {
1567         tgt_lfsck_query = query;
1568 }
1569 EXPORT_SYMBOL(tgt_register_lfsck_query);
1570
1571 /* LFSCK request handlers */
1572 static int tgt_handle_lfsck_notify(struct tgt_session_info *tsi)
1573 {
1574         const struct lu_env     *env = tsi->tsi_env;
1575         struct dt_device        *key = tsi->tsi_tgt->lut_bottom;
1576         struct lfsck_request    *lr;
1577         int                      rc;
1578         ENTRY;
1579
1580         lr = req_capsule_client_get(tsi->tsi_pill, &RMF_LFSCK_REQUEST);
1581         if (lr == NULL)
1582                 RETURN(-EPROTO);
1583
1584         rc = tgt_lfsck_in_notify(env, key, lr);
1585
1586         RETURN(rc);
1587 }
1588
1589 static int tgt_handle_lfsck_query(struct tgt_session_info *tsi)
1590 {
1591         struct lfsck_request    *request;
1592         struct lfsck_reply      *reply;
1593         int                      rc;
1594         ENTRY;
1595
1596         request = req_capsule_client_get(tsi->tsi_pill, &RMF_LFSCK_REQUEST);
1597         if (request == NULL)
1598                 RETURN(-EPROTO);
1599
1600         reply = req_capsule_server_get(tsi->tsi_pill, &RMF_LFSCK_REPLY);
1601         if (reply == NULL)
1602                 RETURN(-ENOMEM);
1603
1604         rc = tgt_lfsck_query(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
1605                              request, reply, NULL);
1606
1607         RETURN(rc < 0 ? rc : 0);
1608 }
1609
1610 struct tgt_handler tgt_lfsck_handlers[] = {
1611 TGT_LFSCK_HDL(HAS_REPLY,        LFSCK_NOTIFY,   tgt_handle_lfsck_notify),
1612 TGT_LFSCK_HDL(HAS_REPLY,        LFSCK_QUERY,    tgt_handle_lfsck_query),
1613 };
1614 EXPORT_SYMBOL(tgt_lfsck_handlers);
1615
1616 /*
1617  * initialize per-thread page pool (bug 5137).
1618  */
1619 int tgt_io_thread_init(struct ptlrpc_thread *thread)
1620 {
1621         struct tgt_thread_big_cache *tbc;
1622
1623         ENTRY;
1624
1625         LASSERT(thread != NULL);
1626         LASSERT(thread->t_data == NULL);
1627
1628         OBD_ALLOC_LARGE(tbc, sizeof(*tbc));
1629         if (tbc == NULL)
1630                 RETURN(-ENOMEM);
1631         thread->t_data = tbc;
1632         RETURN(0);
1633 }
1634 EXPORT_SYMBOL(tgt_io_thread_init);
1635
1636 /*
1637  * free per-thread pool created by tgt_thread_init().
1638  */
1639 void tgt_io_thread_done(struct ptlrpc_thread *thread)
1640 {
1641         struct tgt_thread_big_cache *tbc;
1642
1643         ENTRY;
1644
1645         LASSERT(thread != NULL);
1646
1647         /*
1648          * be prepared to handle partially-initialized pools (because this is
1649          * called from ost_io_thread_init() for cleanup.
1650          */
1651         tbc = thread->t_data;
1652         if (tbc != NULL) {
1653                 OBD_FREE_LARGE(tbc, sizeof(*tbc));
1654                 thread->t_data = NULL;
1655         }
1656         EXIT;
1657 }
1658 EXPORT_SYMBOL(tgt_io_thread_done);
1659
1660 /**
1661  * Helper function for getting Data-on-MDT file server DLM lock
1662  * if asked by client.
1663  */
1664 int tgt_mdt_data_lock(struct ldlm_namespace *ns, struct ldlm_res_id *res_id,
1665                       struct lustre_handle *lh, int mode, __u64 *flags)
1666 {
1667         union ldlm_policy_data policy = {
1668                 .l_inodebits.bits = MDS_INODELOCK_DOM,
1669         };
1670         int rc;
1671
1672         ENTRY;
1673
1674         LASSERT(lh != NULL);
1675         LASSERT(ns != NULL);
1676         LASSERT(!lustre_handle_is_used(lh));
1677
1678         rc = ldlm_cli_enqueue_local(NULL, ns, res_id, LDLM_IBITS, &policy, mode,
1679                                     flags, ldlm_blocking_ast,
1680                                     ldlm_completion_ast, ldlm_glimpse_ast,
1681                                     NULL, 0, LVB_T_NONE, NULL, lh);
1682
1683         RETURN(rc == ELDLM_OK ? 0 : -EIO);
1684 }
1685 EXPORT_SYMBOL(tgt_mdt_data_lock);
1686
1687 /**
1688  * Helper function for getting server side [start, start+count] DLM lock
1689  * if asked by client.
1690  */
1691 int tgt_extent_lock(const struct lu_env *env, struct ldlm_namespace *ns,
1692                     struct ldlm_res_id *res_id, __u64 start, __u64 end,
1693                     struct lustre_handle *lh, int mode, __u64 *flags)
1694 {
1695         union ldlm_policy_data policy;
1696         int rc;
1697
1698         ENTRY;
1699
1700         LASSERT(lh != NULL);
1701         LASSERT(ns != NULL);
1702         LASSERT(!lustre_handle_is_used(lh));
1703
1704         policy.l_extent.gid = 0;
1705         policy.l_extent.start = start & PAGE_MASK;
1706
1707         /*
1708          * If ->o_blocks is EOF it means "lock till the end of the file".
1709          * Otherwise, it's size of an extent or hole being punched (in bytes).
1710          */
1711         if (end == OBD_OBJECT_EOF || end < start)
1712                 policy.l_extent.end = OBD_OBJECT_EOF;
1713         else
1714                 policy.l_extent.end = end | ~PAGE_MASK;
1715
1716         rc = ldlm_cli_enqueue_local(env, ns, res_id, LDLM_EXTENT, &policy,
1717                                     mode, flags, ldlm_blocking_ast,
1718                                     ldlm_completion_ast, ldlm_glimpse_ast,
1719                                     NULL, 0, LVB_T_NONE, NULL, lh);
1720         RETURN(rc == ELDLM_OK ? 0 : -EIO);
1721 }
1722 EXPORT_SYMBOL(tgt_extent_lock);
1723
1724 static int tgt_data_lock(const struct lu_env *env, struct obd_export *exp,
1725                          struct ldlm_res_id *res_id, __u64 start, __u64 end,
1726                          struct lustre_handle *lh, enum ldlm_mode mode)
1727 {
1728         struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
1729         __u64 flags = 0;
1730
1731         /* MDT IO for data-on-mdt */
1732         if (exp->exp_connect_data.ocd_connect_flags & OBD_CONNECT_IBITS)
1733                 return tgt_mdt_data_lock(ns, res_id, lh, mode, &flags);
1734
1735         return tgt_extent_lock(env, ns, res_id, start, end, lh, mode, &flags);
1736 }
1737
1738 void tgt_data_unlock(struct lustre_handle *lh, enum ldlm_mode mode)
1739 {
1740         LASSERT(lustre_handle_is_used(lh));
1741         ldlm_lock_decref(lh, mode);
1742 }
1743 EXPORT_SYMBOL(tgt_data_unlock);
1744
1745 static int tgt_brw_lock(const struct lu_env *env, struct obd_export *exp,
1746                         struct ldlm_res_id *res_id, struct obd_ioobj *obj,
1747                         struct niobuf_remote *nb, struct lustre_handle *lh,
1748                         enum ldlm_mode mode)
1749 {
1750         int nrbufs = obj->ioo_bufcnt;
1751         int i;
1752
1753         ENTRY;
1754
1755         LASSERT(mode == LCK_PR || mode == LCK_PW);
1756         LASSERT(!lustre_handle_is_used(lh));
1757
1758         if (exp->exp_obd->obd_recovering)
1759                 RETURN(0);
1760
1761         if (nrbufs == 0 || !(nb[0].rnb_flags & OBD_BRW_SRVLOCK))
1762                 RETURN(0);
1763
1764         for (i = 1; i < nrbufs; i++)
1765                 if (!(nb[i].rnb_flags & OBD_BRW_SRVLOCK))
1766                         RETURN(-EFAULT);
1767
1768         return tgt_data_lock(env, exp, res_id, nb[0].rnb_offset,
1769                              nb[nrbufs - 1].rnb_offset +
1770                              nb[nrbufs - 1].rnb_len - 1, lh, mode);
1771 }
1772
1773 static void tgt_brw_unlock(struct obd_export *exp, struct obd_ioobj *obj,
1774                            struct niobuf_remote *niob,
1775                            struct lustre_handle *lh, enum ldlm_mode mode)
1776 {
1777         ENTRY;
1778
1779         LASSERT(mode == LCK_PR || mode == LCK_PW);
1780         LASSERT((!exp->exp_obd->obd_recovering && obj->ioo_bufcnt &&
1781                  niob[0].rnb_flags & OBD_BRW_SRVLOCK) ==
1782                 lustre_handle_is_used(lh));
1783
1784         if (lustre_handle_is_used(lh))
1785                 tgt_data_unlock(lh, mode);
1786         EXIT;
1787 }
1788
1789 static int tgt_checksum_niobuf(struct lu_target *tgt,
1790                                  struct niobuf_local *local_nb, int npages,
1791                                  int opc, enum cksum_types cksum_type,
1792                                  __u32 *cksum)
1793 {
1794         struct ahash_request           *req;
1795         unsigned int                    bufsize;
1796         int                             i, err;
1797         unsigned char                   cfs_alg = cksum_obd2cfs(cksum_type);
1798
1799         req = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1800         if (IS_ERR(req)) {
1801                 CERROR("%s: unable to initialize checksum hash %s\n",
1802                        tgt_name(tgt), cfs_crypto_hash_name(cfs_alg));
1803                 return PTR_ERR(req);
1804         }
1805
1806         CDEBUG(D_INFO, "Checksum for algo %s\n", cfs_crypto_hash_name(cfs_alg));
1807         for (i = 0; i < npages; i++) {
1808                 /* corrupt the data before we compute the checksum, to
1809                  * simulate a client->OST data error */
1810                 if (i == 0 && opc == OST_WRITE &&
1811                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_RECEIVE)) {
1812                         int off = local_nb[i].lnb_page_offset & ~PAGE_MASK;
1813                         int len = local_nb[i].lnb_len;
1814                         struct page *np = tgt_page_to_corrupt;
1815
1816                         if (np) {
1817                                 char *ptr = kmap_atomic(local_nb[i].lnb_page);
1818                                 char *ptr2 = page_address(np);
1819
1820                                 memcpy(ptr2 + off, ptr + off, len);
1821                                 memcpy(ptr2 + off, "bad3", min(4, len));
1822                                 kunmap_atomic(ptr);
1823
1824                                 /* LU-8376 to preserve original index for
1825                                  * display in dump_all_bulk_pages() */
1826                                 np->index = i;
1827
1828                                 cfs_crypto_hash_update_page(req, np, off,
1829                                                             len);
1830                                 continue;
1831                         } else {
1832                                 CERROR("%s: can't alloc page for corruption\n",
1833                                        tgt_name(tgt));
1834                         }
1835                 }
1836                 cfs_crypto_hash_update_page(req, local_nb[i].lnb_page,
1837                                   local_nb[i].lnb_page_offset & ~PAGE_MASK,
1838                                   local_nb[i].lnb_len);
1839
1840                  /* corrupt the data after we compute the checksum, to
1841                  * simulate an OST->client data error */
1842                 if (i == 0 && opc == OST_READ &&
1843                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_SEND)) {
1844                         int off = local_nb[i].lnb_page_offset & ~PAGE_MASK;
1845                         int len = local_nb[i].lnb_len;
1846                         struct page *np = tgt_page_to_corrupt;
1847
1848                         if (np) {
1849                                 char *ptr = kmap_atomic(local_nb[i].lnb_page);
1850                                 char *ptr2 = page_address(np);
1851
1852                                 memcpy(ptr2 + off, ptr + off, len);
1853                                 memcpy(ptr2 + off, "bad4", min(4, len));
1854                                 kunmap_atomic(ptr);
1855
1856                                 /* LU-8376 to preserve original index for
1857                                  * display in dump_all_bulk_pages() */
1858                                 np->index = i;
1859
1860                                 cfs_crypto_hash_update_page(req, np, off,
1861                                                             len);
1862                                 continue;
1863                         } else {
1864                                 CERROR("%s: can't alloc page for corruption\n",
1865                                        tgt_name(tgt));
1866                         }
1867                 }
1868         }
1869
1870         bufsize = sizeof(*cksum);
1871         err = cfs_crypto_hash_final(req, (unsigned char *)cksum, &bufsize);
1872
1873         return 0;
1874 }
1875
1876 char dbgcksum_file_name[PATH_MAX];
1877
1878 static void dump_all_bulk_pages(struct obdo *oa, int count,
1879                                 struct niobuf_local *local_nb,
1880                                 __u32 server_cksum, __u32 client_cksum)
1881 {
1882         struct file *filp;
1883         int rc, i;
1884         unsigned int len;
1885         char *buf;
1886
1887         /* will only keep dump of pages on first error for the same range in
1888          * file/fid, not during the resends/retries. */
1889         snprintf(dbgcksum_file_name, sizeof(dbgcksum_file_name),
1890                  "%s-checksum_dump-ost-"DFID":[%llu-%llu]-%x-%x",
1891                  (strncmp(libcfs_debug_file_path, "NONE", 4) != 0 ?
1892                   libcfs_debug_file_path : LIBCFS_DEBUG_FILE_PATH_DEFAULT),
1893                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : (__u64)0,
1894                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1895                  oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1896                  local_nb[0].lnb_file_offset,
1897                  local_nb[count-1].lnb_file_offset +
1898                  local_nb[count-1].lnb_len - 1, client_cksum, server_cksum);
1899         filp = filp_open(dbgcksum_file_name,
1900                          O_CREAT | O_EXCL | O_WRONLY | O_LARGEFILE, 0600);
1901         if (IS_ERR(filp)) {
1902                 rc = PTR_ERR(filp);
1903                 if (rc == -EEXIST)
1904                         CDEBUG(D_INFO, "%s: can't open to dump pages with "
1905                                "checksum error: rc = %d\n", dbgcksum_file_name,
1906                                rc);
1907                 else
1908                         CERROR("%s: can't open to dump pages with checksum "
1909                                "error: rc = %d\n", dbgcksum_file_name, rc);
1910                 return;
1911         }
1912
1913         for (i = 0; i < count; i++) {
1914                 len = local_nb[i].lnb_len;
1915                 buf = kmap(local_nb[i].lnb_page);
1916                 while (len != 0) {
1917                         rc = cfs_kernel_write(filp, buf, len, &filp->f_pos);
1918                         if (rc < 0) {
1919                                 CERROR("%s: wanted to write %u but got %d "
1920                                        "error\n", dbgcksum_file_name, len, rc);
1921                                 break;
1922                         }
1923                         len -= rc;
1924                         buf += rc;
1925                         CDEBUG(D_INFO, "%s: wrote %d bytes\n",
1926                                dbgcksum_file_name, rc);
1927                 }
1928                 kunmap(local_nb[i].lnb_page);
1929         }
1930
1931         rc = vfs_fsync_range(filp, 0, LLONG_MAX, 1);
1932         if (rc)
1933                 CERROR("%s: sync returns %d\n", dbgcksum_file_name, rc);
1934         filp_close(filp, NULL);
1935 }
1936
1937 static int check_read_checksum(struct niobuf_local *local_nb, int npages,
1938                                struct obd_export *exp, struct obdo *oa,
1939                                const struct lnet_process_id *peer,
1940                                __u32 client_cksum, __u32 server_cksum,
1941                                enum cksum_types server_cksum_type)
1942 {
1943         char *msg;
1944         enum cksum_types cksum_type;
1945         loff_t start, end;
1946
1947         /* unlikely to happen and only if resend does not occur due to cksum
1948          * control failure on Client */
1949         if (unlikely(server_cksum == client_cksum)) {
1950                 CDEBUG(D_PAGE, "checksum %x confirmed upon retry\n",
1951                        client_cksum);
1952                 return 0;
1953         }
1954
1955         if (exp->exp_obd->obd_checksum_dump)
1956                 dump_all_bulk_pages(oa, npages, local_nb, server_cksum,
1957                                     client_cksum);
1958
1959         cksum_type = obd_cksum_type_unpack(oa->o_valid & OBD_MD_FLFLAGS ?
1960                                            oa->o_flags : 0);
1961
1962         if (cksum_type != server_cksum_type)
1963                 msg = "the server may have not used the checksum type specified"
1964                       " in the original request - likely a protocol problem";
1965         else
1966                 msg = "should have changed on the client or in transit";
1967
1968         start = local_nb[0].lnb_file_offset;
1969         end = local_nb[npages-1].lnb_file_offset +
1970                                         local_nb[npages-1].lnb_len - 1;
1971
1972         LCONSOLE_ERROR_MSG(0x132, "%s: BAD READ CHECKSUM: %s: from %s inode "
1973                 DFID " object "DOSTID" extent [%llu-%llu], client returned csum"
1974                 " %x (type %x), server csum %x (type %x)\n",
1975                 exp->exp_obd->obd_name,
1976                 msg, libcfs_nid2str(peer->nid),
1977                 oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : 0ULL,
1978                 oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1979                 oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1980                 POSTID(&oa->o_oi),
1981                 start, end, client_cksum, cksum_type, server_cksum,
1982                 server_cksum_type);
1983
1984         return 1;
1985 }
1986
1987 static int tgt_pages2shortio(struct niobuf_local *local, int npages,
1988                              unsigned char *buf, int size)
1989 {
1990         int     i, off, len, copied = size;
1991         char    *ptr;
1992
1993         for (i = 0; i < npages; i++) {
1994                 off = local[i].lnb_page_offset & ~PAGE_MASK;
1995                 len = local[i].lnb_len;
1996
1997                 CDEBUG(D_PAGE, "index %d offset = %d len = %d left = %d\n",
1998                        i, off, len, size);
1999                 if (len > size)
2000                         return -EINVAL;
2001
2002                 ptr = kmap_atomic(local[i].lnb_page);
2003                 memcpy(buf, ptr + off, len);
2004                 kunmap_atomic(ptr);
2005                 buf += len;
2006                 size -= len;
2007         }
2008         return copied - size;
2009 }
2010
2011 static int tgt_checksum_niobuf_t10pi(struct lu_target *tgt,
2012                                      struct niobuf_local *local_nb,
2013                                      int npages, int opc,
2014                                      obd_dif_csum_fn *fn,
2015                                      int sector_size,
2016                                      u32 *check_sum)
2017 {
2018         enum cksum_types t10_cksum_type = tgt->lut_dt_conf.ddp_t10_cksum_type;
2019         unsigned char cfs_alg = cksum_obd2cfs(OBD_CKSUM_T10_TOP);
2020         const char *obd_name = tgt->lut_obd->obd_name;
2021         struct ahash_request *req;
2022         unsigned int bufsize;
2023         unsigned char *buffer;
2024         struct page *__page;
2025         __u16 *guard_start;
2026         int guard_number;
2027         int used_number = 0;
2028         __u32 cksum;
2029         int rc = 0;
2030         int used;
2031         int i;
2032
2033         __page = alloc_page(GFP_KERNEL);
2034         if (__page == NULL)
2035                 return -ENOMEM;
2036
2037         req = cfs_crypto_hash_init(cfs_alg, NULL, 0);
2038         if (IS_ERR(req)) {
2039                 CERROR("%s: unable to initialize checksum hash %s\n",
2040                        tgt_name(tgt), cfs_crypto_hash_name(cfs_alg));
2041                 return PTR_ERR(req);
2042         }
2043
2044         buffer = kmap(__page);
2045         guard_start = (__u16 *)buffer;
2046         guard_number = PAGE_SIZE / sizeof(*guard_start);
2047         for (i = 0; i < npages; i++) {
2048                 /* corrupt the data before we compute the checksum, to
2049                  * simulate a client->OST data error */
2050                 if (i == 0 && opc == OST_WRITE &&
2051                     OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_RECEIVE)) {
2052                         int off = local_nb[i].lnb_page_offset & ~PAGE_MASK;
2053                         int len = local_nb[i].lnb_len;
2054                         struct page *np = tgt_page_to_corrupt;
2055
2056                         if (np) {
2057                                 char *ptr = kmap_atomic(local_nb[i].lnb_page);
2058                                 char *ptr2 = page_address(np);
2059
2060                                 memcpy(ptr2 + off, ptr + off, len);
2061                                 memcpy(ptr2 + off, "bad3", min(4, len));
2062                                 kunmap_atomic(ptr);
2063
2064                                 /* LU-8376 to preserve original index for
2065                                  * display in dump_all_bulk_pages() */
2066                                 np->index = i;
2067
2068                                 cfs_crypto_hash_update_page(req, np, off,
2069                                                             len);
2070                                 continue;
2071                         } else {
2072                                 CERROR("%s: can't alloc page for corruption\n",
2073                                        tgt_name(tgt));
2074                         }
2075                 }
2076
2077                 /*
2078                  * The left guard number should be able to hold checksums of a
2079                  * whole page
2080                  */
2081                 if (t10_cksum_type && opc == OST_READ &&
2082                     local_nb[i].lnb_len == PAGE_SIZE &&
2083                     local_nb[i].lnb_guard_disk) {
2084                         used = DIV_ROUND_UP(local_nb[i].lnb_len, sector_size);
2085                         if (used > (guard_number - used_number)) {
2086                                 rc = -E2BIG;
2087                                 break;
2088                         }
2089                         memcpy(guard_start + used_number,
2090                                local_nb[i].lnb_guards,
2091                                used * sizeof(*local_nb[i].lnb_guards));
2092                 } else {
2093                         rc = obd_page_dif_generate_buffer(obd_name,
2094                                 local_nb[i].lnb_page,
2095                                 local_nb[i].lnb_page_offset & ~PAGE_MASK,
2096                                 local_nb[i].lnb_len, guard_start + used_number,
2097                                 guard_number - used_number, &used, sector_size,
2098                                 fn);
2099                         if (rc)
2100                                 break;
2101                 }
2102
2103                 LASSERT(used <= MAX_GUARD_NUMBER);
2104                 /*
2105                  * If disk support T10PI checksum, copy guards to local_nb.
2106                  * If the write is partial page, do not use the guards for bio
2107                  * submission since the data might not be full-sector. The bio
2108                  * guards will be generated later based on the full sectors. If
2109                  * the sector size is 512B rather than 4 KB, or the page size
2110                  * is larger than 4KB, this might drop some useful guards for
2111                  * partial page write, but it will only add minimal extra time
2112                  * of checksum calculation.
2113                  */
2114                 if (t10_cksum_type && opc == OST_WRITE &&
2115                     local_nb[i].lnb_len == PAGE_SIZE) {
2116                         local_nb[i].lnb_guard_rpc = 1;
2117                         memcpy(local_nb[i].lnb_guards,
2118                                guard_start + used_number,
2119                                used * sizeof(*local_nb[i].lnb_guards));
2120                 }
2121
2122                 used_number += used;
2123                 if (used_number == guard_number) {
2124                         cfs_crypto_hash_update_page(req, __page, 0,
2125                                 used_number * sizeof(*guard_start));
2126                         used_number = 0;
2127                 }
2128
2129                  /* corrupt the data after we compute the checksum, to
2130                  * simulate an OST->client data error */
2131                 if (unlikely(i == 0 && opc == OST_READ &&
2132                              OBD_FAIL_CHECK(OBD_FAIL_OST_CHECKSUM_SEND))) {
2133                         int off = local_nb[i].lnb_page_offset & ~PAGE_MASK;
2134                         int len = local_nb[i].lnb_len;
2135                         struct page *np = tgt_page_to_corrupt;
2136
2137                         if (np) {
2138                                 char *ptr = kmap_atomic(local_nb[i].lnb_page);
2139                                 char *ptr2 = page_address(np);
2140
2141                                 memcpy(ptr2 + off, ptr + off, len);
2142                                 memcpy(ptr2 + off, "bad4", min(4, len));
2143                                 kunmap_atomic(ptr);
2144
2145                                 /* LU-8376 to preserve original index for
2146                                  * display in dump_all_bulk_pages() */
2147                                 np->index = i;
2148
2149                                 cfs_crypto_hash_update_page(req, np, off,
2150                                                             len);
2151                                 continue;
2152                         } else {
2153                                 CERROR("%s: can't alloc page for corruption\n",
2154                                        tgt_name(tgt));
2155                         }
2156                 }
2157         }
2158         kunmap(__page);
2159         if (rc)
2160                 GOTO(out, rc);
2161
2162         if (used_number != 0)
2163                 cfs_crypto_hash_update_page(req, __page, 0,
2164                         used_number * sizeof(*guard_start));
2165
2166         bufsize = sizeof(cksum);
2167         rc = cfs_crypto_hash_final(req, (unsigned char *)&cksum, &bufsize);
2168
2169         if (rc == 0)
2170                 *check_sum = cksum;
2171 out:
2172         __free_page(__page);
2173         return rc;
2174 }
2175
2176 static int tgt_checksum_niobuf_rw(struct lu_target *tgt,
2177                                   enum cksum_types cksum_type,
2178                                   struct niobuf_local *local_nb,
2179                                   int npages, int opc, u32 *check_sum)
2180 {
2181         obd_dif_csum_fn *fn = NULL;
2182         int sector_size = 0;
2183         int rc;
2184
2185         ENTRY;
2186         obd_t10_cksum2dif(cksum_type, &fn, &sector_size);
2187
2188         if (fn)
2189                 rc = tgt_checksum_niobuf_t10pi(tgt, local_nb, npages,
2190                                                opc, fn, sector_size,
2191                                                check_sum);
2192         else
2193                 rc = tgt_checksum_niobuf(tgt, local_nb, npages, opc,
2194                                          cksum_type, check_sum);
2195         RETURN(rc);
2196 }
2197
2198 int tgt_brw_read(struct tgt_session_info *tsi)
2199 {
2200         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2201         struct ptlrpc_bulk_desc *desc = NULL;
2202         struct obd_export       *exp = tsi->tsi_exp;
2203         struct niobuf_remote    *remote_nb;
2204         struct niobuf_local     *local_nb;
2205         struct obd_ioobj        *ioo;
2206         struct ost_body         *body, *repbody;
2207         struct lustre_handle     lockh = { 0 };
2208         int                      npages, nob = 0, rc, i, no_reply = 0,
2209                                  npages_read;
2210         struct tgt_thread_big_cache *tbc = req->rq_svc_thread->t_data;
2211         const char *obd_name = exp->exp_obd->obd_name;
2212
2213         ENTRY;
2214
2215         if (ptlrpc_req2svc(req)->srv_req_portal != OST_IO_PORTAL &&
2216             ptlrpc_req2svc(req)->srv_req_portal != MDS_IO_PORTAL) {
2217                 CERROR("%s: deny read request from %s to portal %u\n",
2218                        tgt_name(tsi->tsi_tgt),
2219                        obd_export_nid2str(req->rq_export),
2220                        ptlrpc_req2svc(req)->srv_req_portal);
2221                 RETURN(-EPROTO);
2222         }
2223
2224         req->rq_bulk_read = 1;
2225
2226         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_READ_BULK))
2227                 RETURN(-EIO);
2228
2229         OBD_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_BULK, cfs_fail_val > 0 ?
2230                          cfs_fail_val : (obd_timeout + 1) / 4);
2231
2232         /* Check if there is eviction in progress, and if so, wait for it to
2233          * finish */
2234         if (unlikely(atomic_read(&exp->exp_obd->obd_evict_inprogress))) {
2235                 /* We do not care how long it takes */
2236                 wait_event_idle(
2237                         exp->exp_obd->obd_evict_inprogress_waitq,
2238                         !atomic_read(&exp->exp_obd->obd_evict_inprogress));
2239         }
2240
2241         /* There must be big cache in current thread to process this request
2242          * if it is NULL then something went wrong and it wasn't allocated,
2243          * report -ENOMEM in that case */
2244         if (tbc == NULL)
2245                 RETURN(-ENOMEM);
2246
2247         body = tsi->tsi_ost_body;
2248         LASSERT(body != NULL);
2249
2250         ioo = req_capsule_client_get(tsi->tsi_pill, &RMF_OBD_IOOBJ);
2251         LASSERT(ioo != NULL); /* must exists after tgt_ost_body_unpack */
2252
2253         remote_nb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE);
2254         LASSERT(remote_nb != NULL); /* must exists after tgt_ost_body_unpack */
2255
2256         local_nb = tbc->local;
2257
2258         rc = tgt_brw_lock(tsi->tsi_env, exp, &tsi->tsi_resid, ioo, remote_nb,
2259                           &lockh, LCK_PR);
2260         if (rc != 0)
2261                 RETURN(rc);
2262
2263         /*
2264          * If getting the lock took more time than
2265          * client was willing to wait, drop it. b=11330
2266          */
2267         if (ktime_get_real_seconds() > req->rq_deadline ||
2268             OBD_FAIL_CHECK(OBD_FAIL_OST_DROP_REQ)) {
2269                 no_reply = 1;
2270                 CERROR("Dropping timed-out read from %s because locking object " DOSTID " took %lld seconds (limit was %lld).\n",
2271                        libcfs_id2str(req->rq_peer), POSTID(&ioo->ioo_oid),
2272                        ktime_get_real_seconds() - req->rq_arrival_time.tv_sec,
2273                        req->rq_deadline - req->rq_arrival_time.tv_sec);
2274                 GOTO(out_lock, rc = -ETIMEDOUT);
2275         }
2276
2277         repbody = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
2278         repbody->oa = body->oa;
2279
2280         npages = PTLRPC_MAX_BRW_PAGES;
2281         rc = obd_preprw(tsi->tsi_env, OBD_BRW_READ, exp, &repbody->oa, 1,
2282                         ioo, remote_nb, &npages, local_nb);
2283         if (rc != 0)
2284                 GOTO(out_lock, rc);
2285
2286         if (body->oa.o_valid & OBD_MD_FLFLAGS &&
2287             body->oa.o_flags & OBD_FL_SHORT_IO) {
2288                 desc = NULL;
2289         } else {
2290                 desc = ptlrpc_prep_bulk_exp(req, npages, ioobj_max_brw_get(ioo),
2291                                             PTLRPC_BULK_PUT_SOURCE,
2292                                             OST_BULK_PORTAL,
2293                                             &ptlrpc_bulk_kiov_nopin_ops);
2294                 if (desc == NULL)
2295                         GOTO(out_commitrw, rc = -ENOMEM);
2296         }
2297
2298         nob = 0;
2299         npages_read = npages;
2300         for (i = 0; i < npages; i++) {
2301                 int page_rc = local_nb[i].lnb_rc;
2302
2303                 if (page_rc < 0) {
2304                         rc = page_rc;
2305                         npages_read = i;
2306                         break;
2307                 }
2308
2309                 nob += page_rc;
2310                 if (page_rc != 0 && desc != NULL) { /* some data! */
2311                         LASSERT(local_nb[i].lnb_page != NULL);
2312                         desc->bd_frag_ops->add_kiov_frag
2313                           (desc, local_nb[i].lnb_page,
2314                            local_nb[i].lnb_page_offset & ~PAGE_MASK,
2315                            page_rc);
2316                 }
2317
2318                 if (page_rc != local_nb[i].lnb_len) { /* short read */
2319                         local_nb[i].lnb_len = page_rc;
2320                         npages_read = i + (page_rc != 0 ? 1 : 0);
2321                         /* All subsequent pages should be 0 */
2322                         while (++i < npages)
2323                                 LASSERT(local_nb[i].lnb_rc == 0);
2324                         break;
2325                 }
2326         }
2327
2328         if (body->oa.o_valid & OBD_MD_FLCKSUM) {
2329                 u32 flag = body->oa.o_valid & OBD_MD_FLFLAGS ?
2330                            body->oa.o_flags : 0;
2331                 enum cksum_types cksum_type = obd_cksum_type_unpack(flag);
2332
2333                 repbody->oa.o_flags = obd_cksum_type_pack(obd_name,
2334                                                           cksum_type);
2335                 repbody->oa.o_valid = OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
2336
2337                 rc = tgt_checksum_niobuf_rw(tsi->tsi_tgt, cksum_type,
2338                                             local_nb, npages_read, OST_READ,
2339                                             &repbody->oa.o_cksum);
2340                 if (rc < 0)
2341                         GOTO(out_commitrw, rc);
2342                 CDEBUG(D_PAGE, "checksum at read origin: %x\n",
2343                        repbody->oa.o_cksum);
2344
2345                 /* if a resend it could be for a cksum error, so check Server
2346                  * cksum with returned Client cksum (this should even cover
2347                  * zero-cksum case) */
2348                 if ((body->oa.o_valid & OBD_MD_FLFLAGS) &&
2349                     (body->oa.o_flags & OBD_FL_RECOV_RESEND))
2350                         check_read_checksum(local_nb, npages_read, exp,
2351                                             &body->oa, &req->rq_peer,
2352                                             body->oa.o_cksum,
2353                                             repbody->oa.o_cksum, cksum_type);
2354         } else {
2355                 repbody->oa.o_valid = 0;
2356         }
2357         /* We're finishing using body->oa as an input variable */
2358
2359         /* Check if client was evicted while we were doing i/o before touching
2360          * network */
2361         if (rc == 0) {
2362                 if (body->oa.o_valid & OBD_MD_FLFLAGS &&
2363                     body->oa.o_flags & OBD_FL_SHORT_IO) {
2364                         unsigned char *short_io_buf;
2365                         int short_io_size;
2366
2367                         short_io_buf = req_capsule_server_get(&req->rq_pill,
2368                                                               &RMF_SHORT_IO);
2369                         short_io_size = req_capsule_get_size(&req->rq_pill,
2370                                                              &RMF_SHORT_IO,
2371                                                              RCL_SERVER);
2372                         rc = tgt_pages2shortio(local_nb, npages_read,
2373                                                short_io_buf, short_io_size);
2374                         if (rc >= 0)
2375                                 req_capsule_shrink(&req->rq_pill,
2376                                                    &RMF_SHORT_IO, rc,
2377                                                    RCL_SERVER);
2378                         rc = rc > 0 ? 0 : rc;
2379                 } else if (!CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2)) {
2380                         rc = target_bulk_io(exp, desc);
2381                 }
2382                 no_reply = rc != 0;
2383         } else {
2384                 if (body->oa.o_valid & OBD_MD_FLFLAGS &&
2385                     body->oa.o_flags & OBD_FL_SHORT_IO)
2386                         req_capsule_shrink(&req->rq_pill, &RMF_SHORT_IO, 0,
2387                                            RCL_SERVER);
2388         }
2389
2390 out_commitrw:
2391         /* Must commit after prep above in all cases */
2392         rc = obd_commitrw(tsi->tsi_env, OBD_BRW_READ, exp, &repbody->oa, 1, ioo,
2393                           remote_nb, npages, local_nb, rc);
2394 out_lock:
2395         tgt_brw_unlock(exp, ioo, remote_nb, &lockh, LCK_PR);
2396
2397         if (desc && !CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2))
2398                 ptlrpc_free_bulk(desc);
2399
2400         LASSERT(rc <= 0);
2401         if (rc == 0) {
2402                 rc = nob;
2403                 ptlrpc_lprocfs_brw(req, nob);
2404         } else if (no_reply) {
2405                 req->rq_no_reply = 1;
2406                 /* reply out callback would free */
2407                 ptlrpc_req_drop_rs(req);
2408                 LCONSOLE_WARN("%s: Bulk IO read error with %s (at %s), "
2409                               "client will retry: rc %d\n",
2410                               obd_name,
2411                               obd_uuid2str(&exp->exp_client_uuid),
2412                               obd_export_nid2str(exp), rc);
2413         }
2414         /* send a bulk after reply to simulate a network delay or reordering
2415          * by a router - Note that !desc implies short io, so there is no bulk
2416          * to reorder. */
2417         if (unlikely(CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2)) &&
2418             desc) {
2419                 CDEBUG(D_INFO, "reorder BULK\n");
2420
2421                 ssleep(3);
2422                 target_bulk_io(exp, desc);
2423                 ptlrpc_free_bulk(desc);
2424         }
2425
2426         RETURN(rc);
2427 }
2428 EXPORT_SYMBOL(tgt_brw_read);
2429
2430 static int tgt_shortio2pages(struct niobuf_local *local, int npages,
2431                              unsigned char *buf, unsigned int size)
2432 {
2433         int     i, off, len;
2434         char    *ptr;
2435
2436         for (i = 0; i < npages; i++) {
2437                 off = local[i].lnb_page_offset & ~PAGE_MASK;
2438                 len = local[i].lnb_len;
2439
2440                 if (len == 0)
2441                         continue;
2442
2443                 CDEBUG(D_PAGE, "index %d offset = %d len = %d left = %d\n",
2444                        i, off, len, size);
2445                 ptr = kmap_atomic(local[i].lnb_page);
2446                 if (ptr == NULL)
2447                         return -EINVAL;
2448                 memcpy(ptr + off, buf, len < size ? len : size);
2449                 kunmap_atomic(ptr);
2450                 buf += len;
2451                 size -= len;
2452         }
2453         return 0;
2454 }
2455
2456 static void tgt_warn_on_cksum(struct ptlrpc_request *req,
2457                               struct ptlrpc_bulk_desc *desc,
2458                               struct niobuf_local *local_nb, int npages,
2459                               u32 client_cksum, u32 server_cksum,
2460                               bool mmap)
2461 {
2462         struct obd_export *exp = req->rq_export;
2463         struct ost_body *body;
2464         char *router = "";
2465         char *via = "";
2466
2467         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
2468         LASSERT(body != NULL);
2469
2470         if (desc && req->rq_peer.nid != desc->bd_sender) {
2471                 via = " via ";
2472                 router = libcfs_nid2str(desc->bd_sender);
2473         }
2474
2475         if (exp->exp_obd->obd_checksum_dump)
2476                 dump_all_bulk_pages(&body->oa, npages, local_nb, server_cksum,
2477                                     client_cksum);
2478
2479         if (mmap) {
2480                 CDEBUG_LIMIT(D_INFO, "client csum %x, server csum %x\n",
2481                              client_cksum, server_cksum);
2482                 return;
2483         }
2484
2485         LCONSOLE_ERROR_MSG(0x168, "%s: BAD WRITE CHECKSUM: from %s%s%s inode "
2486                            DFID" object "DOSTID" extent [%llu-%llu"
2487                            "]: client csum %x, server csum %x\n",
2488                            exp->exp_obd->obd_name, libcfs_id2str(req->rq_peer),
2489                            via, router,
2490                            body->oa.o_valid & OBD_MD_FLFID ?
2491                            body->oa.o_parent_seq : (__u64)0,
2492                            body->oa.o_valid & OBD_MD_FLFID ?
2493                            body->oa.o_parent_oid : 0,
2494                            body->oa.o_valid & OBD_MD_FLFID ?
2495                            body->oa.o_parent_ver : 0,
2496                            POSTID(&body->oa.o_oi),
2497                            local_nb[0].lnb_file_offset,
2498                            local_nb[npages-1].lnb_file_offset +
2499                            local_nb[npages - 1].lnb_len - 1,
2500                            client_cksum, server_cksum);
2501 }
2502
2503 int tgt_brw_write(struct tgt_session_info *tsi)
2504 {
2505         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2506         struct ptlrpc_bulk_desc *desc = NULL;
2507         struct obd_export       *exp = req->rq_export;
2508         struct niobuf_remote    *remote_nb;
2509         struct niobuf_local     *local_nb;
2510         struct obd_ioobj        *ioo;
2511         struct ost_body         *body, *repbody;
2512         struct lustre_handle     lockh = {0};
2513         __u32                   *rcs;
2514         int                      objcount, niocount, npages;
2515         int                      rc, i, j;
2516         enum cksum_types cksum_type = OBD_CKSUM_CRC32;
2517         bool                     no_reply = false, mmap;
2518         struct tgt_thread_big_cache *tbc = req->rq_svc_thread->t_data;
2519         bool wait_sync = false;
2520         const char *obd_name = exp->exp_obd->obd_name;
2521         /* '1' for consistency with code that checks !mpflag to restore */
2522         unsigned int mpflags = 1;
2523
2524         ENTRY;
2525
2526         if (ptlrpc_req2svc(req)->srv_req_portal != OST_IO_PORTAL &&
2527             ptlrpc_req2svc(req)->srv_req_portal != MDS_IO_PORTAL) {
2528                 CERROR("%s: deny write request from %s to portal %u\n",
2529                        tgt_name(tsi->tsi_tgt),
2530                        obd_export_nid2str(req->rq_export),
2531                        ptlrpc_req2svc(req)->srv_req_portal);
2532                 RETURN(err_serious(-EPROTO));
2533         }
2534
2535         if (OBD_FAIL_CHECK(OBD_FAIL_OST_ENOSPC))
2536                 RETURN(err_serious(-ENOSPC));
2537         if (OBD_FAIL_TIMEOUT(OBD_FAIL_OST_EROFS, 1))
2538                 RETURN(err_serious(-EROFS));
2539
2540         req->rq_bulk_write = 1;
2541
2542         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK))
2543                 RETURN(err_serious(-EIO));
2544         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK2))
2545                 RETURN(err_serious(-EFAULT));
2546
2547         /* pause before transaction has been started */
2548         CFS_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_BULK, cfs_fail_val > 0 ?
2549                          cfs_fail_val : (obd_timeout + 1) / 4);
2550
2551         /* Delay write commit to show stale size information */
2552         CFS_FAIL_TIMEOUT(OBD_FAIL_OSC_NO_SIZE_DATA, cfs_fail_val);
2553
2554         /* There must be big cache in current thread to process this request
2555          * if it is NULL then something went wrong and it wasn't allocated,
2556          * report -ENOMEM in that case */
2557         if (tbc == NULL)
2558                 RETURN(-ENOMEM);
2559
2560         body = tsi->tsi_ost_body;
2561         LASSERT(body != NULL);
2562
2563         ioo = req_capsule_client_get(&req->rq_pill, &RMF_OBD_IOOBJ);
2564         LASSERT(ioo != NULL); /* must exists after tgt_ost_body_unpack */
2565
2566         objcount = req_capsule_get_size(&req->rq_pill, &RMF_OBD_IOOBJ,
2567                                         RCL_CLIENT) / sizeof(*ioo);
2568
2569         for (niocount = i = 0; i < objcount; i++)
2570                 niocount += ioo[i].ioo_bufcnt;
2571
2572         remote_nb = req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE);
2573         LASSERT(remote_nb != NULL); /* must exists after tgt_ost_body_unpack */
2574         if (niocount != req_capsule_get_size(&req->rq_pill,
2575                                              &RMF_NIOBUF_REMOTE, RCL_CLIENT) /
2576                         sizeof(*remote_nb))
2577                 RETURN(err_serious(-EPROTO));
2578
2579         if ((remote_nb[0].rnb_flags & OBD_BRW_MEMALLOC) &&
2580             ptlrpc_connection_is_local(exp->exp_connection))
2581                 mpflags = memalloc_noreclaim_save();
2582
2583         req_capsule_set_size(&req->rq_pill, &RMF_RCS, RCL_SERVER,
2584                              niocount * sizeof(*rcs));
2585         rc = req_capsule_server_pack(&req->rq_pill);
2586         if (rc != 0)
2587                 GOTO(out, rc = err_serious(rc));
2588
2589         CFS_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_PACK, cfs_fail_val);
2590         rcs = req_capsule_server_get(&req->rq_pill, &RMF_RCS);
2591
2592         local_nb = tbc->local;
2593
2594         rc = tgt_brw_lock(tsi->tsi_env, exp, &tsi->tsi_resid, ioo, remote_nb,
2595                           &lockh, LCK_PW);
2596         if (rc != 0)
2597                 GOTO(out, rc);
2598
2599         /*
2600          * If getting the lock took more time than
2601          * client was willing to wait, drop it. b=11330
2602          */
2603         if (ktime_get_real_seconds() > req->rq_deadline ||
2604             OBD_FAIL_CHECK(OBD_FAIL_OST_DROP_REQ)) {
2605                 no_reply = true;
2606                 CERROR("%s: Dropping timed-out write from %s because locking object " DOSTID " took %lld seconds (limit was %lld).\n",
2607                        tgt_name(tsi->tsi_tgt), libcfs_id2str(req->rq_peer),
2608                        POSTID(&ioo->ioo_oid),
2609                        ktime_get_real_seconds() - req->rq_arrival_time.tv_sec,
2610                        req->rq_deadline - req->rq_arrival_time.tv_sec);
2611                 GOTO(out_lock, rc = -ETIMEDOUT);
2612         }
2613
2614         /* Because we already sync grant info with client when reconnect,
2615          * grant info will be cleared for resent req, then fed_grant and
2616          * total_grant will not be modified in following preprw_write */
2617         if (lustre_msg_get_flags(req->rq_reqmsg) & (MSG_RESENT | MSG_REPLAY)) {
2618                 DEBUG_REQ(D_CACHE, req, "clear resent/replay req grant info");
2619                 body->oa.o_valid &= ~OBD_MD_FLGRANT;
2620         }
2621
2622         repbody = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
2623         if (repbody == NULL)
2624                 GOTO(out_lock, rc = -ENOMEM);
2625         repbody->oa = body->oa;
2626
2627         npages = PTLRPC_MAX_BRW_PAGES;
2628         rc = obd_preprw(tsi->tsi_env, OBD_BRW_WRITE, exp, &repbody->oa,
2629                         objcount, ioo, remote_nb, &npages, local_nb);
2630         if (rc < 0)
2631                 GOTO(out_lock, rc);
2632         if (body->oa.o_valid & OBD_MD_FLFLAGS &&
2633             body->oa.o_flags & OBD_FL_SHORT_IO) {
2634                 unsigned int short_io_size;
2635                 unsigned char *short_io_buf;
2636
2637                 short_io_size = req_capsule_get_size(&req->rq_pill,
2638                                                      &RMF_SHORT_IO,
2639                                                      RCL_CLIENT);
2640                 short_io_buf = req_capsule_client_get(&req->rq_pill,
2641                                                       &RMF_SHORT_IO);
2642                 CDEBUG(D_INFO, "Client use short io for data transfer,"
2643                                " size = %d\n", short_io_size);
2644
2645                 /* Copy short io buf to pages */
2646                 rc = tgt_shortio2pages(local_nb, npages, short_io_buf,
2647                                        short_io_size);
2648                 desc = NULL;
2649         } else {
2650                 desc = ptlrpc_prep_bulk_exp(req, npages, ioobj_max_brw_get(ioo),
2651                                             PTLRPC_BULK_GET_SINK,
2652                                             OST_BULK_PORTAL,
2653                                             &ptlrpc_bulk_kiov_nopin_ops);
2654                 if (desc == NULL)
2655                         GOTO(skip_transfer, rc = -ENOMEM);
2656
2657                 /* NB Having prepped, we must commit... */
2658                 for (i = 0; i < npages; i++)
2659                         desc->bd_frag_ops->add_kiov_frag(desc,
2660                                         local_nb[i].lnb_page,
2661                                         local_nb[i].lnb_page_offset & ~PAGE_MASK,
2662                                         local_nb[i].lnb_len);
2663
2664                 rc = sptlrpc_svc_prep_bulk(req, desc);
2665                 if (rc != 0)
2666                         GOTO(skip_transfer, rc);
2667
2668                 rc = target_bulk_io(exp, desc);
2669         }
2670
2671         no_reply = rc != 0;
2672
2673 skip_transfer:
2674         if (body->oa.o_valid & OBD_MD_FLCKSUM && rc == 0) {
2675                 static int cksum_counter;
2676
2677                 if (body->oa.o_valid & OBD_MD_FLFLAGS)
2678                         cksum_type = obd_cksum_type_unpack(body->oa.o_flags);
2679
2680                 repbody->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
2681                 repbody->oa.o_flags &= ~OBD_FL_CKSUM_ALL;
2682                 repbody->oa.o_flags |= obd_cksum_type_pack(obd_name,
2683                                                            cksum_type);
2684
2685                 rc = tgt_checksum_niobuf_rw(tsi->tsi_tgt, cksum_type,
2686                                             local_nb, npages, OST_WRITE,
2687                                             &repbody->oa.o_cksum);
2688                 if (rc < 0)
2689                         GOTO(out_commitrw, rc);
2690
2691                 cksum_counter++;
2692
2693                 if (unlikely(body->oa.o_cksum != repbody->oa.o_cksum)) {
2694                         mmap = (body->oa.o_valid & OBD_MD_FLFLAGS &&
2695                                 body->oa.o_flags & OBD_FL_MMAP);
2696
2697                         tgt_warn_on_cksum(req, desc, local_nb, npages,
2698                                           body->oa.o_cksum,
2699                                           repbody->oa.o_cksum, mmap);
2700                         cksum_counter = 0;
2701                 } else if ((cksum_counter & (-cksum_counter)) ==
2702                            cksum_counter) {
2703                         CDEBUG(D_INFO, "Checksum %u from %s OK: %x\n",
2704                                cksum_counter, libcfs_id2str(req->rq_peer),
2705                                repbody->oa.o_cksum);
2706                 }
2707         }
2708
2709         OBD_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_BULK2, cfs_fail_val);
2710
2711 out_commitrw:
2712         /* Must commit after prep above in all cases */
2713         rc = obd_commitrw(tsi->tsi_env, OBD_BRW_WRITE, exp, &repbody->oa,
2714                           objcount, ioo, remote_nb, npages, local_nb, rc);
2715         if (rc == -ENOTCONN)
2716                 /* quota acquire process has been given up because
2717                  * either the client has been evicted or the client
2718                  * has timed out the request already */
2719                 no_reply = true;
2720
2721         for (i = 0; i < niocount; i++) {
2722                 if (!(local_nb[i].lnb_flags & OBD_BRW_ASYNC)) {
2723                         wait_sync = true;
2724                         break;
2725                 }
2726         }
2727         /*
2728          * Disable sending mtime back to the client. If the client locked the
2729          * whole object, then it has already updated the mtime on its side,
2730          * otherwise it will have to glimpse anyway (see bug 21489, comment 32)
2731          */
2732         repbody->oa.o_valid &= ~(OBD_MD_FLMTIME | OBD_MD_FLATIME);
2733
2734         if (rc == 0) {
2735                 int nob = 0;
2736
2737                 /* set per-requested niobuf return codes */
2738                 for (i = j = 0; i < niocount; i++) {
2739                         int len = remote_nb[i].rnb_len;
2740
2741                         nob += len;
2742                         rcs[i] = 0;
2743                         do {
2744                                 LASSERT(j < npages);
2745                                 if (local_nb[j].lnb_rc < 0)
2746                                         rcs[i] = local_nb[j].lnb_rc;
2747                                 len -= local_nb[j].lnb_len;
2748                                 j++;
2749                         } while (len > 0);
2750                         LASSERT(len == 0);
2751                 }
2752                 LASSERT(j == npages);
2753                 ptlrpc_lprocfs_brw(req, nob);
2754         }
2755 out_lock:
2756         tgt_brw_unlock(exp, ioo, remote_nb, &lockh, LCK_PW);
2757         if (desc)
2758                 ptlrpc_free_bulk(desc);
2759 out:
2760         if (unlikely(no_reply || (exp->exp_obd->obd_no_transno && wait_sync))) {
2761                 req->rq_no_reply = 1;
2762                 /* reply out callback would free */
2763                 ptlrpc_req_drop_rs(req);
2764                 if (!exp->exp_obd->obd_no_transno)
2765                         LCONSOLE_WARN("%s: Bulk IO write error with %s (at %s),"
2766                                       " client will retry: rc = %d\n",
2767                                       obd_name,
2768                                       obd_uuid2str(&exp->exp_client_uuid),
2769                                       obd_export_nid2str(exp), rc);
2770         }
2771
2772         if (mpflags)
2773                 memalloc_noreclaim_restore(mpflags);
2774
2775         RETURN(rc);
2776 }
2777 EXPORT_SYMBOL(tgt_brw_write);
2778
2779 /**
2780  * Common request handler for OST_SEEK RPC.
2781  *
2782  * Unified request handling for OST_SEEK RPC.
2783  * It takes object by its FID, does needed lseek and packs result
2784  * into reply. Only SEEK_HOLE and SEEK_DATA are supported.
2785  *
2786  * \param[in] tsi       target session environment for this request
2787  *
2788  * \retval              0 if successful
2789  * \retval              negative value on error
2790  */
2791 int tgt_lseek(struct tgt_session_info *tsi)
2792 {
2793         struct lustre_handle lh = { 0 };
2794         struct dt_object *dob;
2795         struct ost_body *repbody;
2796         loff_t offset = tsi->tsi_ost_body->oa.o_size;
2797         int whence = tsi->tsi_ost_body->oa.o_mode;
2798         bool srvlock;
2799         int rc = 0;
2800
2801         ENTRY;
2802
2803         if (whence != SEEK_HOLE && whence != SEEK_DATA)
2804                 RETURN(-EPROTO);
2805
2806         /* Negative offset is prohibited on wire and must be handled on client
2807          * prior sending RPC.
2808          */
2809         if (offset < 0)
2810                 RETURN(-EPROTO);
2811
2812         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_OST_BODY);
2813         if (repbody == NULL)
2814                 RETURN(-ENOMEM);
2815         repbody->oa = tsi->tsi_ost_body->oa;
2816
2817         srvlock = tsi->tsi_ost_body->oa.o_valid & OBD_MD_FLFLAGS &&
2818                   tsi->tsi_ost_body->oa.o_flags & OBD_FL_SRVLOCK;
2819         if (srvlock) {
2820                 rc = tgt_data_lock(tsi->tsi_env, tsi->tsi_exp, &tsi->tsi_resid,
2821                                    offset, OBD_OBJECT_EOF, &lh, LCK_PR);
2822                 if (rc)
2823                         RETURN(rc);
2824         }
2825
2826         dob = dt_locate(tsi->tsi_env, tsi->tsi_tgt->lut_bottom, &tsi->tsi_fid);
2827         if (IS_ERR(dob))
2828                 GOTO(out, rc = PTR_ERR(dob));
2829
2830         if (!dt_object_exists(dob))
2831                 GOTO(obj_put, rc = -ENOENT);
2832
2833         repbody->oa.o_size = dt_lseek(tsi->tsi_env, dob, offset, whence);
2834         rc = 0;
2835 obj_put:
2836         dt_object_put(tsi->tsi_env, dob);
2837 out:
2838         if (srvlock)
2839                 tgt_data_unlock(&lh, LCK_PR);
2840
2841         RETURN(rc);
2842 }
2843 EXPORT_SYMBOL(tgt_lseek);
2844
2845 /* Check if request can be reconstructed from saved reply data
2846  * A copy of the reply data is returned in @trd if the pointer is not NULL
2847  */
2848 int req_can_reconstruct(struct ptlrpc_request *req,
2849                          struct tg_reply_data *trd)
2850 {
2851         struct tg_export_data *ted = &req->rq_export->exp_target_data;
2852         struct lsd_client_data *lcd = ted->ted_lcd;
2853         int found;
2854
2855         if (tgt_is_multimodrpcs_client(req->rq_export))
2856                 return tgt_lookup_reply(req, trd);
2857
2858         mutex_lock(&ted->ted_lcd_lock);
2859         found = req->rq_xid == lcd->lcd_last_xid ||
2860                 req->rq_xid == lcd->lcd_last_close_xid;
2861
2862         if (found && trd != NULL) {
2863                 if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE) {
2864                         trd->trd_reply.lrd_xid = lcd->lcd_last_close_xid;
2865                         trd->trd_reply.lrd_transno =
2866                                                 lcd->lcd_last_close_transno;
2867                         trd->trd_reply.lrd_result = lcd->lcd_last_close_result;
2868                 } else {
2869                         trd->trd_reply.lrd_xid = lcd->lcd_last_xid;
2870                         trd->trd_reply.lrd_transno = lcd->lcd_last_transno;
2871                         trd->trd_reply.lrd_result = lcd->lcd_last_result;
2872                         trd->trd_reply.lrd_data = lcd->lcd_last_data;
2873                         trd->trd_pre_versions[0] = lcd->lcd_pre_versions[0];
2874                         trd->trd_pre_versions[1] = lcd->lcd_pre_versions[1];
2875                         trd->trd_pre_versions[2] = lcd->lcd_pre_versions[2];
2876                         trd->trd_pre_versions[3] = lcd->lcd_pre_versions[3];
2877                 }
2878         }
2879         mutex_unlock(&ted->ted_lcd_lock);
2880
2881         return found;
2882 }
2883 EXPORT_SYMBOL(req_can_reconstruct);
2884