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[fs/lustre-release.git] / lustre / osc / osc_request.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, see
18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19  *
20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21  * CA 95054 USA or visit www.sun.com if you need additional information or
22  * have any questions.
23  *
24  * GPL HEADER END
25  */
26 /*
27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
28  * Use is subject to license terms.
29  *
30  * Copyright (c) 2011, 2013, Intel Corporation.
31  */
32 /*
33  * This file is part of Lustre, http://www.lustre.org/
34  * Lustre is a trademark of Sun Microsystems, Inc.
35  */
36
37 #define DEBUG_SUBSYSTEM S_OSC
38
39 #include <libcfs/libcfs.h>
40
41 #ifndef __KERNEL__
42 # include <liblustre.h>
43 #endif
44
45 #include <lustre_dlm.h>
46 #include <lustre_net.h>
47 #include <lustre/lustre_user.h>
48 #include <obd_cksum.h>
49 #include <obd_ost.h>
50 #include <obd_lov.h>
51
52 #ifdef  __CYGWIN__
53 # include <ctype.h>
54 #endif
55
56 #include <lustre_ha.h>
57 #include <lprocfs_status.h>
58 #include <lustre_log.h>
59 #include <lustre_debug.h>
60 #include <lustre_param.h>
61 #include <lustre_fid.h>
62 #include "osc_internal.h"
63 #include "osc_cl_internal.h"
64
65 static void osc_release_ppga(struct brw_page **ppga, obd_count count);
66 static int brw_interpret(const struct lu_env *env,
67                          struct ptlrpc_request *req, void *data, int rc);
68 int osc_cleanup(struct obd_device *obd);
69
70 /* Pack OSC object metadata for disk storage (LE byte order). */
71 static int osc_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
72                       struct lov_stripe_md *lsm)
73 {
74         int lmm_size;
75         ENTRY;
76
77         lmm_size = sizeof(**lmmp);
78         if (lmmp == NULL)
79                 RETURN(lmm_size);
80
81         if (*lmmp != NULL && lsm == NULL) {
82                 OBD_FREE(*lmmp, lmm_size);
83                 *lmmp = NULL;
84                 RETURN(0);
85         } else if (unlikely(lsm != NULL && ostid_id(&lsm->lsm_oi) == 0)) {
86                 RETURN(-EBADF);
87         }
88
89         if (*lmmp == NULL) {
90                 OBD_ALLOC(*lmmp, lmm_size);
91                 if (*lmmp == NULL)
92                         RETURN(-ENOMEM);
93         }
94
95         if (lsm)
96                 ostid_cpu_to_le(&lsm->lsm_oi, &(*lmmp)->lmm_oi);
97
98         RETURN(lmm_size);
99 }
100
101 /* Unpack OSC object metadata from disk storage (LE byte order). */
102 static int osc_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
103                         struct lov_mds_md *lmm, int lmm_bytes)
104 {
105         int lsm_size;
106         struct obd_import *imp = class_exp2cliimp(exp);
107         ENTRY;
108
109         if (lmm != NULL) {
110                 if (lmm_bytes < sizeof(*lmm)) {
111                         CERROR("%s: lov_mds_md too small: %d, need %d\n",
112                                exp->exp_obd->obd_name, lmm_bytes,
113                                (int)sizeof(*lmm));
114                         RETURN(-EINVAL);
115                 }
116                 /* XXX LOV_MAGIC etc check? */
117
118                 if (unlikely(ostid_id(&lmm->lmm_oi) == 0)) {
119                         CERROR("%s: zero lmm_object_id: rc = %d\n",
120                                exp->exp_obd->obd_name, -EINVAL);
121                         RETURN(-EINVAL);
122                 }
123         }
124
125         lsm_size = lov_stripe_md_size(1);
126         if (lsmp == NULL)
127                 RETURN(lsm_size);
128
129         if (*lsmp != NULL && lmm == NULL) {
130                 OBD_FREE((*lsmp)->lsm_oinfo[0], sizeof(struct lov_oinfo));
131                 OBD_FREE(*lsmp, lsm_size);
132                 *lsmp = NULL;
133                 RETURN(0);
134         }
135
136         if (*lsmp == NULL) {
137                 OBD_ALLOC(*lsmp, lsm_size);
138                 if (unlikely(*lsmp == NULL))
139                         RETURN(-ENOMEM);
140                 OBD_ALLOC((*lsmp)->lsm_oinfo[0], sizeof(struct lov_oinfo));
141                 if (unlikely((*lsmp)->lsm_oinfo[0] == NULL)) {
142                         OBD_FREE(*lsmp, lsm_size);
143                         RETURN(-ENOMEM);
144                 }
145                 loi_init((*lsmp)->lsm_oinfo[0]);
146         } else if (unlikely(ostid_id(&(*lsmp)->lsm_oi) == 0)) {
147                 RETURN(-EBADF);
148         }
149
150         if (lmm != NULL)
151                 /* XXX zero *lsmp? */
152                 ostid_le_to_cpu(&lmm->lmm_oi, &(*lsmp)->lsm_oi);
153
154         if (imp != NULL &&
155             (imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_MAXBYTES))
156                 (*lsmp)->lsm_maxbytes = imp->imp_connect_data.ocd_maxbytes;
157         else
158                 (*lsmp)->lsm_maxbytes = LUSTRE_STRIPE_MAXBYTES;
159
160         RETURN(lsm_size);
161 }
162
163 static inline void osc_pack_capa(struct ptlrpc_request *req,
164                                  struct ost_body *body, void *capa)
165 {
166         struct obd_capa *oc = (struct obd_capa *)capa;
167         struct lustre_capa *c;
168
169         if (!capa)
170                 return;
171
172         c = req_capsule_client_get(&req->rq_pill, &RMF_CAPA1);
173         LASSERT(c);
174         capa_cpy(c, oc);
175         body->oa.o_valid |= OBD_MD_FLOSSCAPA;
176         DEBUG_CAPA(D_SEC, c, "pack");
177 }
178
179 static inline void osc_pack_req_body(struct ptlrpc_request *req,
180                                      struct obd_info *oinfo)
181 {
182         struct ost_body *body;
183
184         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
185         LASSERT(body);
186
187         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa,
188                              oinfo->oi_oa);
189         osc_pack_capa(req, body, oinfo->oi_capa);
190 }
191
192 static inline void osc_set_capa_size(struct ptlrpc_request *req,
193                                      const struct req_msg_field *field,
194                                      struct obd_capa *oc)
195 {
196         if (oc == NULL)
197                 req_capsule_set_size(&req->rq_pill, field, RCL_CLIENT, 0);
198         else
199                 /* it is already calculated as sizeof struct obd_capa */
200                 ;
201 }
202
203 static int osc_getattr_interpret(const struct lu_env *env,
204                                  struct ptlrpc_request *req,
205                                  struct osc_async_args *aa, int rc)
206 {
207         struct ost_body *body;
208         ENTRY;
209
210         if (rc != 0)
211                 GOTO(out, rc);
212
213         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
214         if (body) {
215                 CDEBUG(D_INODE, "mode: %o\n", body->oa.o_mode);
216                 lustre_get_wire_obdo(&req->rq_import->imp_connect_data,
217                                      aa->aa_oi->oi_oa, &body->oa);
218
219                 /* This should really be sent by the OST */
220                 aa->aa_oi->oi_oa->o_blksize = DT_MAX_BRW_SIZE;
221                 aa->aa_oi->oi_oa->o_valid |= OBD_MD_FLBLKSZ;
222         } else {
223                 CDEBUG(D_INFO, "can't unpack ost_body\n");
224                 rc = -EPROTO;
225                 aa->aa_oi->oi_oa->o_valid = 0;
226         }
227 out:
228         rc = aa->aa_oi->oi_cb_up(aa->aa_oi, rc);
229         RETURN(rc);
230 }
231
232 static int osc_getattr_async(struct obd_export *exp, struct obd_info *oinfo,
233                              struct ptlrpc_request_set *set)
234 {
235         struct ptlrpc_request *req;
236         struct osc_async_args *aa;
237         int                    rc;
238         ENTRY;
239
240         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_GETATTR);
241         if (req == NULL)
242                 RETURN(-ENOMEM);
243
244         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
245         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GETATTR);
246         if (rc) {
247                 ptlrpc_request_free(req);
248                 RETURN(rc);
249         }
250
251         osc_pack_req_body(req, oinfo);
252
253         ptlrpc_request_set_replen(req);
254         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_getattr_interpret;
255
256         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
257         aa = ptlrpc_req_async_args(req);
258         aa->aa_oi = oinfo;
259
260         ptlrpc_set_add_req(set, req);
261         RETURN(0);
262 }
263
264 static int osc_getattr(const struct lu_env *env, struct obd_export *exp,
265                        struct obd_info *oinfo)
266 {
267         struct ptlrpc_request *req;
268         struct ost_body       *body;
269         int                    rc;
270         ENTRY;
271
272         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_GETATTR);
273         if (req == NULL)
274                 RETURN(-ENOMEM);
275
276         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
277         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GETATTR);
278         if (rc) {
279                 ptlrpc_request_free(req);
280                 RETURN(rc);
281         }
282
283         osc_pack_req_body(req, oinfo);
284
285         ptlrpc_request_set_replen(req);
286
287         rc = ptlrpc_queue_wait(req);
288         if (rc)
289                 GOTO(out, rc);
290
291         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
292         if (body == NULL)
293                 GOTO(out, rc = -EPROTO);
294
295         CDEBUG(D_INODE, "mode: %o\n", body->oa.o_mode);
296         lustre_get_wire_obdo(&req->rq_import->imp_connect_data, oinfo->oi_oa,
297                              &body->oa);
298
299         oinfo->oi_oa->o_blksize = cli_brw_size(exp->exp_obd);
300         oinfo->oi_oa->o_valid |= OBD_MD_FLBLKSZ;
301
302         EXIT;
303  out:
304         ptlrpc_req_finished(req);
305         return rc;
306 }
307
308 static int osc_setattr(const struct lu_env *env, struct obd_export *exp,
309                        struct obd_info *oinfo, struct obd_trans_info *oti)
310 {
311         struct ptlrpc_request *req;
312         struct ost_body       *body;
313         int                    rc;
314         ENTRY;
315
316         LASSERT(oinfo->oi_oa->o_valid & OBD_MD_FLGROUP);
317
318         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SETATTR);
319         if (req == NULL)
320                 RETURN(-ENOMEM);
321
322         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
323         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SETATTR);
324         if (rc) {
325                 ptlrpc_request_free(req);
326                 RETURN(rc);
327         }
328
329         osc_pack_req_body(req, oinfo);
330
331         ptlrpc_request_set_replen(req);
332
333         rc = ptlrpc_queue_wait(req);
334         if (rc)
335                 GOTO(out, rc);
336
337         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
338         if (body == NULL)
339                 GOTO(out, rc = -EPROTO);
340
341         lustre_get_wire_obdo(&req->rq_import->imp_connect_data, oinfo->oi_oa,
342                              &body->oa);
343
344         EXIT;
345 out:
346         ptlrpc_req_finished(req);
347         RETURN(rc);
348 }
349
350 static int osc_setattr_interpret(const struct lu_env *env,
351                                  struct ptlrpc_request *req,
352                                  struct osc_setattr_args *sa, int rc)
353 {
354         struct ost_body *body;
355         ENTRY;
356
357         if (rc != 0)
358                 GOTO(out, rc);
359
360         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
361         if (body == NULL)
362                 GOTO(out, rc = -EPROTO);
363
364         lustre_get_wire_obdo(&req->rq_import->imp_connect_data, sa->sa_oa,
365                              &body->oa);
366 out:
367         rc = sa->sa_upcall(sa->sa_cookie, rc);
368         RETURN(rc);
369 }
370
371 int osc_setattr_async_base(struct obd_export *exp, struct obd_info *oinfo,
372                            struct obd_trans_info *oti,
373                            obd_enqueue_update_f upcall, void *cookie,
374                            struct ptlrpc_request_set *rqset)
375 {
376         struct ptlrpc_request   *req;
377         struct osc_setattr_args *sa;
378         int                      rc;
379         ENTRY;
380
381         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SETATTR);
382         if (req == NULL)
383                 RETURN(-ENOMEM);
384
385         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
386         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SETATTR);
387         if (rc) {
388                 ptlrpc_request_free(req);
389                 RETURN(rc);
390         }
391
392         if (oti && oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE)
393                 oinfo->oi_oa->o_lcookie = *oti->oti_logcookies;
394
395         osc_pack_req_body(req, oinfo);
396
397         ptlrpc_request_set_replen(req);
398
399         /* do mds to ost setattr asynchronously */
400         if (!rqset) {
401                 /* Do not wait for response. */
402                 ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
403         } else {
404                 req->rq_interpret_reply =
405                         (ptlrpc_interpterer_t)osc_setattr_interpret;
406
407                 CLASSERT (sizeof(*sa) <= sizeof(req->rq_async_args));
408                 sa = ptlrpc_req_async_args(req);
409                 sa->sa_oa = oinfo->oi_oa;
410                 sa->sa_upcall = upcall;
411                 sa->sa_cookie = cookie;
412
413                 if (rqset == PTLRPCD_SET)
414                         ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
415                 else
416                         ptlrpc_set_add_req(rqset, req);
417         }
418
419         RETURN(0);
420 }
421
422 static int osc_setattr_async(struct obd_export *exp, struct obd_info *oinfo,
423                              struct obd_trans_info *oti,
424                              struct ptlrpc_request_set *rqset)
425 {
426         return osc_setattr_async_base(exp, oinfo, oti,
427                                       oinfo->oi_cb_up, oinfo, rqset);
428 }
429
430 int osc_real_create(struct obd_export *exp, struct obdo *oa,
431                     struct lov_stripe_md **ea, struct obd_trans_info *oti)
432 {
433         struct ptlrpc_request *req;
434         struct ost_body       *body;
435         struct lov_stripe_md  *lsm;
436         int                    rc;
437         ENTRY;
438
439         LASSERT(oa);
440         LASSERT(ea);
441
442         lsm = *ea;
443         if (!lsm) {
444                 rc = obd_alloc_memmd(exp, &lsm);
445                 if (rc < 0)
446                         RETURN(rc);
447         }
448
449         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_CREATE);
450         if (req == NULL)
451                 GOTO(out, rc = -ENOMEM);
452
453         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
454         if (rc) {
455                 ptlrpc_request_free(req);
456                 GOTO(out, rc);
457         }
458
459         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
460         LASSERT(body);
461
462         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
463
464         ptlrpc_request_set_replen(req);
465
466         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
467             oa->o_flags == OBD_FL_DELORPHAN) {
468                 DEBUG_REQ(D_HA, req,
469                           "delorphan from OST integration");
470                 /* Don't resend the delorphan req */
471                 req->rq_no_resend = req->rq_no_delay = 1;
472         }
473
474         rc = ptlrpc_queue_wait(req);
475         if (rc)
476                 GOTO(out_req, rc);
477
478         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
479         if (body == NULL)
480                 GOTO(out_req, rc = -EPROTO);
481
482         CDEBUG(D_INFO, "oa flags %x\n", oa->o_flags);
483         lustre_get_wire_obdo(&req->rq_import->imp_connect_data, oa, &body->oa);
484
485         oa->o_blksize = cli_brw_size(exp->exp_obd);
486         oa->o_valid |= OBD_MD_FLBLKSZ;
487
488         /* XXX LOV STACKING: the lsm that is passed to us from LOV does not
489          * have valid lsm_oinfo data structs, so don't go touching that.
490          * This needs to be fixed in a big way.
491          */
492         lsm->lsm_oi = oa->o_oi;
493         *ea = lsm;
494
495         if (oti != NULL) {
496                 oti->oti_transno = lustre_msg_get_transno(req->rq_repmsg);
497
498                 if (oa->o_valid & OBD_MD_FLCOOKIE) {
499                         if (!oti->oti_logcookies)
500                                 oti_alloc_cookies(oti, 1);
501                         *oti->oti_logcookies = oa->o_lcookie;
502                 }
503         }
504
505         CDEBUG(D_HA, "transno: "LPD64"\n",
506                lustre_msg_get_transno(req->rq_repmsg));
507 out_req:
508         ptlrpc_req_finished(req);
509 out:
510         if (rc && !*ea)
511                 obd_free_memmd(exp, &lsm);
512         RETURN(rc);
513 }
514
515 int osc_punch_base(struct obd_export *exp, struct obd_info *oinfo,
516                    obd_enqueue_update_f upcall, void *cookie,
517                    struct ptlrpc_request_set *rqset)
518 {
519         struct ptlrpc_request   *req;
520         struct osc_setattr_args *sa;
521         struct ost_body         *body;
522         int                      rc;
523         ENTRY;
524
525         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_PUNCH);
526         if (req == NULL)
527                 RETURN(-ENOMEM);
528
529         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
530         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_PUNCH);
531         if (rc) {
532                 ptlrpc_request_free(req);
533                 RETURN(rc);
534         }
535         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
536         ptlrpc_at_set_req_timeout(req);
537
538         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
539         LASSERT(body);
540         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa,
541                              oinfo->oi_oa);
542         osc_pack_capa(req, body, oinfo->oi_capa);
543
544         ptlrpc_request_set_replen(req);
545
546         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_setattr_interpret;
547         CLASSERT (sizeof(*sa) <= sizeof(req->rq_async_args));
548         sa = ptlrpc_req_async_args(req);
549         sa->sa_oa     = oinfo->oi_oa;
550         sa->sa_upcall = upcall;
551         sa->sa_cookie = cookie;
552         if (rqset == PTLRPCD_SET)
553                 ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
554         else
555                 ptlrpc_set_add_req(rqset, req);
556
557         RETURN(0);
558 }
559
560 static int osc_punch(const struct lu_env *env, struct obd_export *exp,
561                      struct obd_info *oinfo, struct obd_trans_info *oti,
562                      struct ptlrpc_request_set *rqset)
563 {
564         oinfo->oi_oa->o_size   = oinfo->oi_policy.l_extent.start;
565         oinfo->oi_oa->o_blocks = oinfo->oi_policy.l_extent.end;
566         oinfo->oi_oa->o_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
567         return osc_punch_base(exp, oinfo,
568                               oinfo->oi_cb_up, oinfo, rqset);
569 }
570
571 static int osc_sync_interpret(const struct lu_env *env,
572                               struct ptlrpc_request *req,
573                               void *arg, int rc)
574 {
575         struct osc_fsync_args *fa = arg;
576         struct ost_body *body;
577         ENTRY;
578
579         if (rc)
580                 GOTO(out, rc);
581
582         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
583         if (body == NULL) {
584                 CERROR ("can't unpack ost_body\n");
585                 GOTO(out, rc = -EPROTO);
586         }
587
588         *fa->fa_oi->oi_oa = body->oa;
589 out:
590         rc = fa->fa_upcall(fa->fa_cookie, rc);
591         RETURN(rc);
592 }
593
594 int osc_sync_base(struct obd_export *exp, struct obd_info *oinfo,
595                   obd_enqueue_update_f upcall, void *cookie,
596                   struct ptlrpc_request_set *rqset)
597 {
598         struct ptlrpc_request *req;
599         struct ost_body       *body;
600         struct osc_fsync_args *fa;
601         int                    rc;
602         ENTRY;
603
604         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SYNC);
605         if (req == NULL)
606                 RETURN(-ENOMEM);
607
608         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
609         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SYNC);
610         if (rc) {
611                 ptlrpc_request_free(req);
612                 RETURN(rc);
613         }
614
615         /* overload the size and blocks fields in the oa with start/end */
616         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
617         LASSERT(body);
618         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa,
619                              oinfo->oi_oa);
620         osc_pack_capa(req, body, oinfo->oi_capa);
621
622         ptlrpc_request_set_replen(req);
623         req->rq_interpret_reply = osc_sync_interpret;
624
625         CLASSERT(sizeof(*fa) <= sizeof(req->rq_async_args));
626         fa = ptlrpc_req_async_args(req);
627         fa->fa_oi = oinfo;
628         fa->fa_upcall = upcall;
629         fa->fa_cookie = cookie;
630
631         if (rqset == PTLRPCD_SET)
632                 ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
633         else
634                 ptlrpc_set_add_req(rqset, req);
635
636         RETURN (0);
637 }
638
639 static int osc_sync(const struct lu_env *env, struct obd_export *exp,
640                     struct obd_info *oinfo, obd_size start, obd_size end,
641                     struct ptlrpc_request_set *set)
642 {
643         ENTRY;
644
645         if (!oinfo->oi_oa) {
646                 CDEBUG(D_INFO, "oa NULL\n");
647                 RETURN(-EINVAL);
648         }
649
650         oinfo->oi_oa->o_size = start;
651         oinfo->oi_oa->o_blocks = end;
652         oinfo->oi_oa->o_valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS);
653
654         RETURN(osc_sync_base(exp, oinfo, oinfo->oi_cb_up, oinfo, set));
655 }
656
657 /* Find and cancel locally locks matched by @mode in the resource found by
658  * @objid. Found locks are added into @cancel list. Returns the amount of
659  * locks added to @cancels list. */
660 static int osc_resource_get_unused(struct obd_export *exp, struct obdo *oa,
661                                    cfs_list_t *cancels,
662                                    ldlm_mode_t mode, __u64 lock_flags)
663 {
664         struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
665         struct ldlm_res_id res_id;
666         struct ldlm_resource *res;
667         int count;
668         ENTRY;
669
670         /* Return, i.e. cancel nothing, only if ELC is supported (flag in
671          * export) but disabled through procfs (flag in NS).
672          *
673          * This distinguishes from a case when ELC is not supported originally,
674          * when we still want to cancel locks in advance and just cancel them
675          * locally, without sending any RPC. */
676         if (exp_connect_cancelset(exp) && !ns_connect_cancelset(ns))
677                 RETURN(0);
678
679         ostid_build_res_name(&oa->o_oi, &res_id);
680         res = ldlm_resource_get(ns, NULL, &res_id, 0, 0);
681         if (res == NULL)
682                 RETURN(0);
683
684         LDLM_RESOURCE_ADDREF(res);
685         count = ldlm_cancel_resource_local(res, cancels, NULL, mode,
686                                            lock_flags, 0, NULL);
687         LDLM_RESOURCE_DELREF(res);
688         ldlm_resource_putref(res);
689         RETURN(count);
690 }
691
692 static int osc_destroy_interpret(const struct lu_env *env,
693                                  struct ptlrpc_request *req, void *data,
694                                  int rc)
695 {
696         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
697
698         cfs_atomic_dec(&cli->cl_destroy_in_flight);
699         wake_up(&cli->cl_destroy_waitq);
700         return 0;
701 }
702
703 static int osc_can_send_destroy(struct client_obd *cli)
704 {
705         if (cfs_atomic_inc_return(&cli->cl_destroy_in_flight) <=
706             cli->cl_max_rpcs_in_flight) {
707                 /* The destroy request can be sent */
708                 return 1;
709         }
710         if (cfs_atomic_dec_return(&cli->cl_destroy_in_flight) <
711             cli->cl_max_rpcs_in_flight) {
712                 /*
713                  * The counter has been modified between the two atomic
714                  * operations.
715                  */
716                 wake_up(&cli->cl_destroy_waitq);
717         }
718         return 0;
719 }
720
721 int osc_create(const struct lu_env *env, struct obd_export *exp,
722                struct obdo *oa, struct lov_stripe_md **ea,
723                struct obd_trans_info *oti)
724 {
725         int rc = 0;
726         ENTRY;
727
728         LASSERT(oa);
729         LASSERT(ea);
730         LASSERT(oa->o_valid & OBD_MD_FLGROUP);
731
732         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
733             oa->o_flags == OBD_FL_RECREATE_OBJS) {
734                 RETURN(osc_real_create(exp, oa, ea, oti));
735         }
736
737         if (!fid_seq_is_mdt(ostid_seq(&oa->o_oi)))
738                 RETURN(osc_real_create(exp, oa, ea, oti));
739
740         /* we should not get here anymore */
741         LBUG();
742
743         RETURN(rc);
744 }
745
746 /* Destroy requests can be async always on the client, and we don't even really
747  * care about the return code since the client cannot do anything at all about
748  * a destroy failure.
749  * When the MDS is unlinking a filename, it saves the file objects into a
750  * recovery llog, and these object records are cancelled when the OST reports
751  * they were destroyed and sync'd to disk (i.e. transaction committed).
752  * If the client dies, or the OST is down when the object should be destroyed,
753  * the records are not cancelled, and when the OST reconnects to the MDS next,
754  * it will retrieve the llog unlink logs and then sends the log cancellation
755  * cookies to the MDS after committing destroy transactions. */
756 static int osc_destroy(const struct lu_env *env, struct obd_export *exp,
757                        struct obdo *oa, struct lov_stripe_md *ea,
758                        struct obd_trans_info *oti, struct obd_export *md_export,
759                        void *capa)
760 {
761         struct client_obd     *cli = &exp->exp_obd->u.cli;
762         struct ptlrpc_request *req;
763         struct ost_body       *body;
764         CFS_LIST_HEAD(cancels);
765         int rc, count;
766         ENTRY;
767
768         if (!oa) {
769                 CDEBUG(D_INFO, "oa NULL\n");
770                 RETURN(-EINVAL);
771         }
772
773         count = osc_resource_get_unused(exp, oa, &cancels, LCK_PW,
774                                         LDLM_FL_DISCARD_DATA);
775
776         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_DESTROY);
777         if (req == NULL) {
778                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
779                 RETURN(-ENOMEM);
780         }
781
782         osc_set_capa_size(req, &RMF_CAPA1, (struct obd_capa *)capa);
783         rc = ldlm_prep_elc_req(exp, req, LUSTRE_OST_VERSION, OST_DESTROY,
784                                0, &cancels, count);
785         if (rc) {
786                 ptlrpc_request_free(req);
787                 RETURN(rc);
788         }
789
790         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
791         ptlrpc_at_set_req_timeout(req);
792
793         if (oti != NULL && oa->o_valid & OBD_MD_FLCOOKIE)
794                 oa->o_lcookie = *oti->oti_logcookies;
795         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
796         LASSERT(body);
797         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
798
799         osc_pack_capa(req, body, (struct obd_capa *)capa);
800         ptlrpc_request_set_replen(req);
801
802         /* If osc_destory is for destroying the unlink orphan,
803          * sent from MDT to OST, which should not be blocked here,
804          * because the process might be triggered by ptlrpcd, and
805          * it is not good to block ptlrpcd thread (b=16006)*/
806         if (!(oa->o_flags & OBD_FL_DELORPHAN)) {
807                 req->rq_interpret_reply = osc_destroy_interpret;
808                 if (!osc_can_send_destroy(cli)) {
809                         struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP,
810                                                           NULL);
811
812                         /*
813                          * Wait until the number of on-going destroy RPCs drops
814                          * under max_rpc_in_flight
815                          */
816                         l_wait_event_exclusive(cli->cl_destroy_waitq,
817                                                osc_can_send_destroy(cli), &lwi);
818                 }
819         }
820
821         /* Do not wait for response */
822         ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
823         RETURN(0);
824 }
825
826 static void osc_announce_cached(struct client_obd *cli, struct obdo *oa,
827                                 long writing_bytes)
828 {
829         obd_flag bits = OBD_MD_FLBLOCKS|OBD_MD_FLGRANT;
830
831         LASSERT(!(oa->o_valid & bits));
832
833         oa->o_valid |= bits;
834         client_obd_list_lock(&cli->cl_loi_list_lock);
835         oa->o_dirty = cli->cl_dirty;
836         if (unlikely(cli->cl_dirty - cli->cl_dirty_transit >
837                      cli->cl_dirty_max)) {
838                 CERROR("dirty %lu - %lu > dirty_max %lu\n",
839                        cli->cl_dirty, cli->cl_dirty_transit, cli->cl_dirty_max);
840                 oa->o_undirty = 0;
841         } else if (unlikely(cfs_atomic_read(&obd_unstable_pages) +
842                             cfs_atomic_read(&obd_dirty_pages) -
843                             cfs_atomic_read(&obd_dirty_transit_pages) >
844                             (long)(obd_max_dirty_pages + 1))) {
845                 /* The cfs_atomic_read() allowing the cfs_atomic_inc() are
846                  * not covered by a lock thus they may safely race and trip
847                  * this CERROR() unless we add in a small fudge factor (+1). */
848                 CERROR("%s: dirty %d + %d - %d > system dirty_max %d\n",
849                        cli->cl_import->imp_obd->obd_name,
850                        cfs_atomic_read(&obd_unstable_pages),
851                        cfs_atomic_read(&obd_dirty_pages),
852                        cfs_atomic_read(&obd_dirty_transit_pages),
853                        obd_max_dirty_pages);
854                 oa->o_undirty = 0;
855         } else if (unlikely(cli->cl_dirty_max - cli->cl_dirty > 0x7fffffff)) {
856                 CERROR("dirty %lu - dirty_max %lu too big???\n",
857                        cli->cl_dirty, cli->cl_dirty_max);
858                 oa->o_undirty = 0;
859         } else {
860                 long max_in_flight = (cli->cl_max_pages_per_rpc <<
861                                       PAGE_CACHE_SHIFT) *
862                                      (cli->cl_max_rpcs_in_flight + 1);
863                 oa->o_undirty = max(cli->cl_dirty_max, max_in_flight);
864         }
865         oa->o_grant = cli->cl_avail_grant + cli->cl_reserved_grant;
866         oa->o_dropped = cli->cl_lost_grant;
867         cli->cl_lost_grant = 0;
868         client_obd_list_unlock(&cli->cl_loi_list_lock);
869         CDEBUG(D_CACHE,"dirty: "LPU64" undirty: %u dropped %u grant: "LPU64"\n",
870                oa->o_dirty, oa->o_undirty, oa->o_dropped, oa->o_grant);
871
872 }
873
874 void osc_update_next_shrink(struct client_obd *cli)
875 {
876         cli->cl_next_shrink_grant =
877                 cfs_time_shift(cli->cl_grant_shrink_interval);
878         CDEBUG(D_CACHE, "next time %ld to shrink grant \n",
879                cli->cl_next_shrink_grant);
880 }
881
882 static void __osc_update_grant(struct client_obd *cli, obd_size grant)
883 {
884         client_obd_list_lock(&cli->cl_loi_list_lock);
885         cli->cl_avail_grant += grant;
886         client_obd_list_unlock(&cli->cl_loi_list_lock);
887 }
888
889 static void osc_update_grant(struct client_obd *cli, struct ost_body *body)
890 {
891         if (body->oa.o_valid & OBD_MD_FLGRANT) {
892                 CDEBUG(D_CACHE, "got "LPU64" extra grant\n", body->oa.o_grant);
893                 __osc_update_grant(cli, body->oa.o_grant);
894         }
895 }
896
897 static int osc_set_info_async(const struct lu_env *env, struct obd_export *exp,
898                               obd_count keylen, void *key, obd_count vallen,
899                               void *val, struct ptlrpc_request_set *set);
900
901 static int osc_shrink_grant_interpret(const struct lu_env *env,
902                                       struct ptlrpc_request *req,
903                                       void *aa, int rc)
904 {
905         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
906         struct obdo *oa = ((struct osc_grant_args *)aa)->aa_oa;
907         struct ost_body *body;
908
909         if (rc != 0) {
910                 __osc_update_grant(cli, oa->o_grant);
911                 GOTO(out, rc);
912         }
913
914         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
915         LASSERT(body);
916         osc_update_grant(cli, body);
917 out:
918         OBDO_FREE(oa);
919         return rc;
920 }
921
922 static void osc_shrink_grant_local(struct client_obd *cli, struct obdo *oa)
923 {
924         client_obd_list_lock(&cli->cl_loi_list_lock);
925         oa->o_grant = cli->cl_avail_grant / 4;
926         cli->cl_avail_grant -= oa->o_grant;
927         client_obd_list_unlock(&cli->cl_loi_list_lock);
928         if (!(oa->o_valid & OBD_MD_FLFLAGS)) {
929                 oa->o_valid |= OBD_MD_FLFLAGS;
930                 oa->o_flags = 0;
931         }
932         oa->o_flags |= OBD_FL_SHRINK_GRANT;
933         osc_update_next_shrink(cli);
934 }
935
936 /* Shrink the current grant, either from some large amount to enough for a
937  * full set of in-flight RPCs, or if we have already shrunk to that limit
938  * then to enough for a single RPC.  This avoids keeping more grant than
939  * needed, and avoids shrinking the grant piecemeal. */
940 static int osc_shrink_grant(struct client_obd *cli)
941 {
942         __u64 target_bytes = (cli->cl_max_rpcs_in_flight + 1) *
943                              (cli->cl_max_pages_per_rpc << PAGE_CACHE_SHIFT);
944
945         client_obd_list_lock(&cli->cl_loi_list_lock);
946         if (cli->cl_avail_grant <= target_bytes)
947                 target_bytes = cli->cl_max_pages_per_rpc << PAGE_CACHE_SHIFT;
948         client_obd_list_unlock(&cli->cl_loi_list_lock);
949
950         return osc_shrink_grant_to_target(cli, target_bytes);
951 }
952
953 int osc_shrink_grant_to_target(struct client_obd *cli, __u64 target_bytes)
954 {
955         int                     rc = 0;
956         struct ost_body        *body;
957         ENTRY;
958
959         client_obd_list_lock(&cli->cl_loi_list_lock);
960         /* Don't shrink if we are already above or below the desired limit
961          * We don't want to shrink below a single RPC, as that will negatively
962          * impact block allocation and long-term performance. */
963         if (target_bytes < cli->cl_max_pages_per_rpc << PAGE_CACHE_SHIFT)
964                 target_bytes = cli->cl_max_pages_per_rpc << PAGE_CACHE_SHIFT;
965
966         if (target_bytes >= cli->cl_avail_grant) {
967                 client_obd_list_unlock(&cli->cl_loi_list_lock);
968                 RETURN(0);
969         }
970         client_obd_list_unlock(&cli->cl_loi_list_lock);
971
972         OBD_ALLOC_PTR(body);
973         if (!body)
974                 RETURN(-ENOMEM);
975
976         osc_announce_cached(cli, &body->oa, 0);
977
978         client_obd_list_lock(&cli->cl_loi_list_lock);
979         body->oa.o_grant = cli->cl_avail_grant - target_bytes;
980         cli->cl_avail_grant = target_bytes;
981         client_obd_list_unlock(&cli->cl_loi_list_lock);
982         if (!(body->oa.o_valid & OBD_MD_FLFLAGS)) {
983                 body->oa.o_valid |= OBD_MD_FLFLAGS;
984                 body->oa.o_flags = 0;
985         }
986         body->oa.o_flags |= OBD_FL_SHRINK_GRANT;
987         osc_update_next_shrink(cli);
988
989         rc = osc_set_info_async(NULL, cli->cl_import->imp_obd->obd_self_export,
990                                 sizeof(KEY_GRANT_SHRINK), KEY_GRANT_SHRINK,
991                                 sizeof(*body), body, NULL);
992         if (rc != 0)
993                 __osc_update_grant(cli, body->oa.o_grant);
994         OBD_FREE_PTR(body);
995         RETURN(rc);
996 }
997
998 static int osc_should_shrink_grant(struct client_obd *client)
999 {
1000         cfs_time_t time = cfs_time_current();
1001         cfs_time_t next_shrink = client->cl_next_shrink_grant;
1002
1003         if ((client->cl_import->imp_connect_data.ocd_connect_flags &
1004              OBD_CONNECT_GRANT_SHRINK) == 0)
1005                 return 0;
1006
1007         if (cfs_time_aftereq(time, next_shrink - 5 * CFS_TICK)) {
1008                 /* Get the current RPC size directly, instead of going via:
1009                  * cli_brw_size(obd->u.cli.cl_import->imp_obd->obd_self_export)
1010                  * Keep comment here so that it can be found by searching. */
1011                 int brw_size = client->cl_max_pages_per_rpc << PAGE_CACHE_SHIFT;
1012
1013                 if (client->cl_import->imp_state == LUSTRE_IMP_FULL &&
1014                     client->cl_avail_grant > brw_size)
1015                         return 1;
1016                 else
1017                         osc_update_next_shrink(client);
1018         }
1019         return 0;
1020 }
1021
1022 static int osc_grant_shrink_grant_cb(struct timeout_item *item, void *data)
1023 {
1024         struct client_obd *client;
1025
1026         cfs_list_for_each_entry(client, &item->ti_obd_list,
1027                                 cl_grant_shrink_list) {
1028                 if (osc_should_shrink_grant(client))
1029                         osc_shrink_grant(client);
1030         }
1031         return 0;
1032 }
1033
1034 static int osc_add_shrink_grant(struct client_obd *client)
1035 {
1036         int rc;
1037
1038         rc = ptlrpc_add_timeout_client(client->cl_grant_shrink_interval,
1039                                        TIMEOUT_GRANT,
1040                                        osc_grant_shrink_grant_cb, NULL,
1041                                        &client->cl_grant_shrink_list);
1042         if (rc) {
1043                 CERROR("add grant client %s error %d\n",
1044                         client->cl_import->imp_obd->obd_name, rc);
1045                 return rc;
1046         }
1047         CDEBUG(D_CACHE, "add grant client %s \n",
1048                client->cl_import->imp_obd->obd_name);
1049         osc_update_next_shrink(client);
1050         return 0;
1051 }
1052
1053 static int osc_del_shrink_grant(struct client_obd *client)
1054 {
1055         return ptlrpc_del_timeout_client(&client->cl_grant_shrink_list,
1056                                          TIMEOUT_GRANT);
1057 }
1058
1059 static void osc_init_grant(struct client_obd *cli, struct obd_connect_data *ocd)
1060 {
1061         /*
1062          * ocd_grant is the total grant amount we're expect to hold: if we've
1063          * been evicted, it's the new avail_grant amount, cl_dirty will drop
1064          * to 0 as inflight RPCs fail out; otherwise, it's avail_grant + dirty.
1065          *
1066          * race is tolerable here: if we're evicted, but imp_state already
1067          * left EVICTED state, then cl_dirty must be 0 already.
1068          */
1069         client_obd_list_lock(&cli->cl_loi_list_lock);
1070         if (cli->cl_import->imp_state == LUSTRE_IMP_EVICTED)
1071                 cli->cl_avail_grant = ocd->ocd_grant;
1072         else
1073                 cli->cl_avail_grant = ocd->ocd_grant - cli->cl_dirty;
1074
1075         if (cli->cl_avail_grant < 0) {
1076                 CWARN("%s: available grant < 0: avail/ocd/dirty %ld/%u/%ld\n",
1077                       cli->cl_import->imp_obd->obd_name, cli->cl_avail_grant,
1078                       ocd->ocd_grant, cli->cl_dirty);
1079                 /* workaround for servers which do not have the patch from
1080                  * LU-2679 */
1081                 cli->cl_avail_grant = ocd->ocd_grant;
1082         }
1083
1084         /* determine the appropriate chunk size used by osc_extent. */
1085         cli->cl_chunkbits = max_t(int, PAGE_CACHE_SHIFT, ocd->ocd_blocksize);
1086         client_obd_list_unlock(&cli->cl_loi_list_lock);
1087
1088         CDEBUG(D_CACHE, "%s, setting cl_avail_grant: %ld cl_lost_grant: %ld."
1089                 "chunk bits: %d.\n", cli->cl_import->imp_obd->obd_name,
1090                 cli->cl_avail_grant, cli->cl_lost_grant, cli->cl_chunkbits);
1091
1092         if (ocd->ocd_connect_flags & OBD_CONNECT_GRANT_SHRINK &&
1093             cfs_list_empty(&cli->cl_grant_shrink_list))
1094                 osc_add_shrink_grant(cli);
1095 }
1096
1097 /* We assume that the reason this OSC got a short read is because it read
1098  * beyond the end of a stripe file; i.e. lustre is reading a sparse file
1099  * via the LOV, and it _knows_ it's reading inside the file, it's just that
1100  * this stripe never got written at or beyond this stripe offset yet. */
1101 static void handle_short_read(int nob_read, obd_count page_count,
1102                               struct brw_page **pga)
1103 {
1104         char *ptr;
1105         int i = 0;
1106
1107         /* skip bytes read OK */
1108         while (nob_read > 0) {
1109                 LASSERT (page_count > 0);
1110
1111                 if (pga[i]->count > nob_read) {
1112                         /* EOF inside this page */
1113                         ptr = kmap(pga[i]->pg) +
1114                                 (pga[i]->off & ~CFS_PAGE_MASK);
1115                         memset(ptr + nob_read, 0, pga[i]->count - nob_read);
1116                         kunmap(pga[i]->pg);
1117                         page_count--;
1118                         i++;
1119                         break;
1120                 }
1121
1122                 nob_read -= pga[i]->count;
1123                 page_count--;
1124                 i++;
1125         }
1126
1127         /* zero remaining pages */
1128         while (page_count-- > 0) {
1129                 ptr = kmap(pga[i]->pg) + (pga[i]->off & ~CFS_PAGE_MASK);
1130                 memset(ptr, 0, pga[i]->count);
1131                 kunmap(pga[i]->pg);
1132                 i++;
1133         }
1134 }
1135
1136 static int check_write_rcs(struct ptlrpc_request *req,
1137                            int requested_nob, int niocount,
1138                            obd_count page_count, struct brw_page **pga)
1139 {
1140         int     i;
1141         __u32   *remote_rcs;
1142
1143         remote_rcs = req_capsule_server_sized_get(&req->rq_pill, &RMF_RCS,
1144                                                   sizeof(*remote_rcs) *
1145                                                   niocount);
1146         if (remote_rcs == NULL) {
1147                 CDEBUG(D_INFO, "Missing/short RC vector on BRW_WRITE reply\n");
1148                 return(-EPROTO);
1149         }
1150
1151         /* return error if any niobuf was in error */
1152         for (i = 0; i < niocount; i++) {
1153                 if ((int)remote_rcs[i] < 0)
1154                         return(remote_rcs[i]);
1155
1156                 if (remote_rcs[i] != 0) {
1157                         CDEBUG(D_INFO, "rc[%d] invalid (%d) req %p\n",
1158                                 i, remote_rcs[i], req);
1159                         return(-EPROTO);
1160                 }
1161         }
1162
1163         if (req->rq_bulk->bd_nob_transferred != requested_nob) {
1164                 CERROR("Unexpected # bytes transferred: %d (requested %d)\n",
1165                        req->rq_bulk->bd_nob_transferred, requested_nob);
1166                 return(-EPROTO);
1167         }
1168
1169         return (0);
1170 }
1171
1172 static inline int can_merge_pages(struct brw_page *p1, struct brw_page *p2)
1173 {
1174         if (p1->flag != p2->flag) {
1175                 unsigned mask = ~(OBD_BRW_FROM_GRANT | OBD_BRW_NOCACHE |
1176                                   OBD_BRW_SYNC       | OBD_BRW_ASYNC   |
1177                                   OBD_BRW_NOQUOTA    | OBD_BRW_SOFT_SYNC);
1178
1179                 /* warn if we try to combine flags that we don't know to be
1180                  * safe to combine */
1181                 if (unlikely((p1->flag & mask) != (p2->flag & mask))) {
1182                         CWARN("Saw flags 0x%x and 0x%x in the same brw, please "
1183                               "report this at http://bugs.whamcloud.com/\n",
1184                               p1->flag, p2->flag);
1185                 }
1186                 return 0;
1187         }
1188
1189         return (p1->off + p1->count == p2->off);
1190 }
1191
1192 static obd_count osc_checksum_bulk(int nob, obd_count pg_count,
1193                                    struct brw_page **pga, int opc,
1194                                    cksum_type_t cksum_type)
1195 {
1196         __u32                           cksum;
1197         int                             i = 0;
1198         struct cfs_crypto_hash_desc     *hdesc;
1199         unsigned int                    bufsize;
1200         int                             err;
1201         unsigned char                   cfs_alg = cksum_obd2cfs(cksum_type);
1202
1203         LASSERT(pg_count > 0);
1204
1205         hdesc = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1206         if (IS_ERR(hdesc)) {
1207                 CERROR("Unable to initialize checksum hash %s\n",
1208                        cfs_crypto_hash_name(cfs_alg));
1209                 return PTR_ERR(hdesc);
1210         }
1211
1212         while (nob > 0 && pg_count > 0) {
1213                 int count = pga[i]->count > nob ? nob : pga[i]->count;
1214
1215                 /* corrupt the data before we compute the checksum, to
1216                  * simulate an OST->client data error */
1217                 if (i == 0 && opc == OST_READ &&
1218                     OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_RECEIVE)) {
1219                         unsigned char *ptr = kmap(pga[i]->pg);
1220                         int off = pga[i]->off & ~CFS_PAGE_MASK;
1221                         memcpy(ptr + off, "bad1", min(4, nob));
1222                         kunmap(pga[i]->pg);
1223                 }
1224                 cfs_crypto_hash_update_page(hdesc, pga[i]->pg,
1225                                   pga[i]->off & ~CFS_PAGE_MASK,
1226                                   count);
1227                 LL_CDEBUG_PAGE(D_PAGE, pga[i]->pg, "off %d\n",
1228                                (int)(pga[i]->off & ~CFS_PAGE_MASK));
1229
1230                 nob -= pga[i]->count;
1231                 pg_count--;
1232                 i++;
1233         }
1234
1235         bufsize = 4;
1236         err = cfs_crypto_hash_final(hdesc, (unsigned char *)&cksum, &bufsize);
1237
1238         if (err)
1239                 cfs_crypto_hash_final(hdesc, NULL, NULL);
1240
1241         /* For sending we only compute the wrong checksum instead
1242          * of corrupting the data so it is still correct on a redo */
1243         if (opc == OST_WRITE && OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_SEND))
1244                 cksum++;
1245
1246         return cksum;
1247 }
1248
1249 static int osc_brw_prep_request(int cmd, struct client_obd *cli,struct obdo *oa,
1250                                 struct lov_stripe_md *lsm, obd_count page_count,
1251                                 struct brw_page **pga,
1252                                 struct ptlrpc_request **reqp,
1253                                 struct obd_capa *ocapa, int reserve,
1254                                 int resend)
1255 {
1256         struct ptlrpc_request   *req;
1257         struct ptlrpc_bulk_desc *desc;
1258         struct ost_body         *body;
1259         struct obd_ioobj        *ioobj;
1260         struct niobuf_remote    *niobuf;
1261         int niocount, i, requested_nob, opc, rc;
1262         struct osc_brw_async_args *aa;
1263         struct req_capsule      *pill;
1264         struct brw_page *pg_prev;
1265
1266         ENTRY;
1267         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_BRW_PREP_REQ))
1268                 RETURN(-ENOMEM); /* Recoverable */
1269         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_BRW_PREP_REQ2))
1270                 RETURN(-EINVAL); /* Fatal */
1271
1272         if ((cmd & OBD_BRW_WRITE) != 0) {
1273                 opc = OST_WRITE;
1274                 req = ptlrpc_request_alloc_pool(cli->cl_import,
1275                                                 cli->cl_import->imp_rq_pool,
1276                                                 &RQF_OST_BRW_WRITE);
1277         } else {
1278                 opc = OST_READ;
1279                 req = ptlrpc_request_alloc(cli->cl_import, &RQF_OST_BRW_READ);
1280         }
1281         if (req == NULL)
1282                 RETURN(-ENOMEM);
1283
1284         for (niocount = i = 1; i < page_count; i++) {
1285                 if (!can_merge_pages(pga[i - 1], pga[i]))
1286                         niocount++;
1287         }
1288
1289         pill = &req->rq_pill;
1290         req_capsule_set_size(pill, &RMF_OBD_IOOBJ, RCL_CLIENT,
1291                              sizeof(*ioobj));
1292         req_capsule_set_size(pill, &RMF_NIOBUF_REMOTE, RCL_CLIENT,
1293                              niocount * sizeof(*niobuf));
1294         osc_set_capa_size(req, &RMF_CAPA1, ocapa);
1295
1296         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, opc);
1297         if (rc) {
1298                 ptlrpc_request_free(req);
1299                 RETURN(rc);
1300         }
1301         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
1302         ptlrpc_at_set_req_timeout(req);
1303         /* ask ptlrpc not to resend on EINPROGRESS since BRWs have their own
1304          * retry logic */
1305         req->rq_no_retry_einprogress = 1;
1306
1307         desc = ptlrpc_prep_bulk_imp(req, page_count,
1308                 cli->cl_import->imp_connect_data.ocd_brw_size >> LNET_MTU_BITS,
1309                 opc == OST_WRITE ? BULK_GET_SOURCE : BULK_PUT_SINK,
1310                 OST_BULK_PORTAL);
1311
1312         if (desc == NULL)
1313                 GOTO(out, rc = -ENOMEM);
1314         /* NB request now owns desc and will free it when it gets freed */
1315
1316         body = req_capsule_client_get(pill, &RMF_OST_BODY);
1317         ioobj = req_capsule_client_get(pill, &RMF_OBD_IOOBJ);
1318         niobuf = req_capsule_client_get(pill, &RMF_NIOBUF_REMOTE);
1319         LASSERT(body != NULL && ioobj != NULL && niobuf != NULL);
1320
1321         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
1322
1323         obdo_to_ioobj(oa, ioobj);
1324         ioobj->ioo_bufcnt = niocount;
1325         /* The high bits of ioo_max_brw tells server _maximum_ number of bulks
1326          * that might be send for this request.  The actual number is decided
1327          * when the RPC is finally sent in ptlrpc_register_bulk(). It sends
1328          * "max - 1" for old client compatibility sending "0", and also so the
1329          * the actual maximum is a power-of-two number, not one less. LU-1431 */
1330         ioobj_max_brw_set(ioobj, desc->bd_md_max_brw);
1331         osc_pack_capa(req, body, ocapa);
1332         LASSERT(page_count > 0);
1333         pg_prev = pga[0];
1334         for (requested_nob = i = 0; i < page_count; i++, niobuf++) {
1335                 struct brw_page *pg = pga[i];
1336                 int poff = pg->off & ~CFS_PAGE_MASK;
1337
1338                 LASSERT(pg->count > 0);
1339                 /* make sure there is no gap in the middle of page array */
1340                 LASSERTF(page_count == 1 ||
1341                          (ergo(i == 0, poff + pg->count == PAGE_CACHE_SIZE) &&
1342                           ergo(i > 0 && i < page_count - 1,
1343                                poff == 0 && pg->count == PAGE_CACHE_SIZE)   &&
1344                           ergo(i == page_count - 1, poff == 0)),
1345                          "i: %d/%d pg: %p off: "LPU64", count: %u\n",
1346                          i, page_count, pg, pg->off, pg->count);
1347 #ifdef __linux__
1348                 LASSERTF(i == 0 || pg->off > pg_prev->off,
1349                          "i %d p_c %u pg %p [pri %lu ind %lu] off "LPU64
1350                          " prev_pg %p [pri %lu ind %lu] off "LPU64"\n",
1351                          i, page_count,
1352                          pg->pg, page_private(pg->pg), pg->pg->index, pg->off,
1353                          pg_prev->pg, page_private(pg_prev->pg),
1354                          pg_prev->pg->index, pg_prev->off);
1355 #else
1356                 LASSERTF(i == 0 || pg->off > pg_prev->off,
1357                          "i %d p_c %u\n", i, page_count);
1358 #endif
1359                 LASSERT((pga[0]->flag & OBD_BRW_SRVLOCK) ==
1360                         (pg->flag & OBD_BRW_SRVLOCK));
1361
1362                 ptlrpc_prep_bulk_page_pin(desc, pg->pg, poff, pg->count);
1363                 requested_nob += pg->count;
1364
1365                 if (i > 0 && can_merge_pages(pg_prev, pg)) {
1366                         niobuf--;
1367                         niobuf->len += pg->count;
1368                 } else {
1369                         niobuf->offset = pg->off;
1370                         niobuf->len    = pg->count;
1371                         niobuf->flags  = pg->flag;
1372                 }
1373                 pg_prev = pg;
1374         }
1375
1376         LASSERTF((void *)(niobuf - niocount) ==
1377                 req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE),
1378                 "want %p - real %p\n", req_capsule_client_get(&req->rq_pill,
1379                 &RMF_NIOBUF_REMOTE), (void *)(niobuf - niocount));
1380
1381         osc_announce_cached(cli, &body->oa, opc == OST_WRITE ? requested_nob:0);
1382         if (resend) {
1383                 if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0) {
1384                         body->oa.o_valid |= OBD_MD_FLFLAGS;
1385                         body->oa.o_flags = 0;
1386                 }
1387                 body->oa.o_flags |= OBD_FL_RECOV_RESEND;
1388         }
1389
1390         if (osc_should_shrink_grant(cli))
1391                 osc_shrink_grant_local(cli, &body->oa);
1392
1393         /* size[REQ_REC_OFF] still sizeof (*body) */
1394         if (opc == OST_WRITE) {
1395                 if (cli->cl_checksum &&
1396                     !sptlrpc_flavor_has_bulk(&req->rq_flvr)) {
1397                         /* store cl_cksum_type in a local variable since
1398                          * it can be changed via lprocfs */
1399                         cksum_type_t cksum_type = cli->cl_cksum_type;
1400
1401                         if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0) {
1402                                 oa->o_flags &= OBD_FL_LOCAL_MASK;
1403                                 body->oa.o_flags = 0;
1404                         }
1405                         body->oa.o_flags |= cksum_type_pack(cksum_type);
1406                         body->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1407                         body->oa.o_cksum = osc_checksum_bulk(requested_nob,
1408                                                              page_count, pga,
1409                                                              OST_WRITE,
1410                                                              cksum_type);
1411                         CDEBUG(D_PAGE, "checksum at write origin: %x\n",
1412                                body->oa.o_cksum);
1413                         /* save this in 'oa', too, for later checking */
1414                         oa->o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1415                         oa->o_flags |= cksum_type_pack(cksum_type);
1416                 } else {
1417                         /* clear out the checksum flag, in case this is a
1418                          * resend but cl_checksum is no longer set. b=11238 */
1419                         oa->o_valid &= ~OBD_MD_FLCKSUM;
1420                 }
1421                 oa->o_cksum = body->oa.o_cksum;
1422                 /* 1 RC per niobuf */
1423                 req_capsule_set_size(pill, &RMF_RCS, RCL_SERVER,
1424                                      sizeof(__u32) * niocount);
1425         } else {
1426                 if (cli->cl_checksum &&
1427                     !sptlrpc_flavor_has_bulk(&req->rq_flvr)) {
1428                         if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0)
1429                                 body->oa.o_flags = 0;
1430                         body->oa.o_flags |= cksum_type_pack(cli->cl_cksum_type);
1431                         body->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1432                 }
1433         }
1434         ptlrpc_request_set_replen(req);
1435
1436         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
1437         aa = ptlrpc_req_async_args(req);
1438         aa->aa_oa = oa;
1439         aa->aa_requested_nob = requested_nob;
1440         aa->aa_nio_count = niocount;
1441         aa->aa_page_count = page_count;
1442         aa->aa_resends = 0;
1443         aa->aa_ppga = pga;
1444         aa->aa_cli = cli;
1445         CFS_INIT_LIST_HEAD(&aa->aa_oaps);
1446         if (ocapa && reserve)
1447                 aa->aa_ocapa = capa_get(ocapa);
1448
1449         *reqp = req;
1450         RETURN(0);
1451
1452  out:
1453         ptlrpc_req_finished(req);
1454         RETURN(rc);
1455 }
1456
1457 static int check_write_checksum(struct obdo *oa, const lnet_process_id_t *peer,
1458                                 __u32 client_cksum, __u32 server_cksum, int nob,
1459                                 obd_count page_count, struct brw_page **pga,
1460                                 cksum_type_t client_cksum_type)
1461 {
1462         __u32 new_cksum;
1463         char *msg;
1464         cksum_type_t cksum_type;
1465
1466         if (server_cksum == client_cksum) {
1467                 CDEBUG(D_PAGE, "checksum %x confirmed\n", client_cksum);
1468                 return 0;
1469         }
1470
1471         cksum_type = cksum_type_unpack(oa->o_valid & OBD_MD_FLFLAGS ?
1472                                        oa->o_flags : 0);
1473         new_cksum = osc_checksum_bulk(nob, page_count, pga, OST_WRITE,
1474                                       cksum_type);
1475
1476         if (cksum_type != client_cksum_type)
1477                 msg = "the server did not use the checksum type specified in "
1478                       "the original request - likely a protocol problem";
1479         else if (new_cksum == server_cksum)
1480                 msg = "changed on the client after we checksummed it - "
1481                       "likely false positive due to mmap IO (bug 11742)";
1482         else if (new_cksum == client_cksum)
1483                 msg = "changed in transit before arrival at OST";
1484         else
1485                 msg = "changed in transit AND doesn't match the original - "
1486                       "likely false positive due to mmap IO (bug 11742)";
1487
1488         LCONSOLE_ERROR_MSG(0x132, "BAD WRITE CHECKSUM: %s: from %s inode "DFID
1489                            " object "DOSTID" extent ["LPU64"-"LPU64"]\n",
1490                            msg, libcfs_nid2str(peer->nid),
1491                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : (__u64)0,
1492                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1493                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1494                            POSTID(&oa->o_oi), pga[0]->off,
1495                            pga[page_count-1]->off + pga[page_count-1]->count - 1);
1496         CERROR("original client csum %x (type %x), server csum %x (type %x), "
1497                "client csum now %x\n", client_cksum, client_cksum_type,
1498                server_cksum, cksum_type, new_cksum);
1499         return 1;
1500 }
1501
1502 /* Note rc enters this function as number of bytes transferred */
1503 static int osc_brw_fini_request(struct ptlrpc_request *req, int rc)
1504 {
1505         struct osc_brw_async_args *aa = (void *)&req->rq_async_args;
1506         const lnet_process_id_t *peer =
1507                         &req->rq_import->imp_connection->c_peer;
1508         struct client_obd *cli = aa->aa_cli;
1509         struct ost_body *body;
1510         __u32 client_cksum = 0;
1511         ENTRY;
1512
1513         if (rc < 0 && rc != -EDQUOT) {
1514                 DEBUG_REQ(D_INFO, req, "Failed request with rc = %d\n", rc);
1515                 RETURN(rc);
1516         }
1517
1518         LASSERTF(req->rq_repmsg != NULL, "rc = %d\n", rc);
1519         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
1520         if (body == NULL) {
1521                 DEBUG_REQ(D_INFO, req, "Can't unpack body\n");
1522                 RETURN(-EPROTO);
1523         }
1524
1525         /* set/clear over quota flag for a uid/gid */
1526         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE &&
1527             body->oa.o_valid & (OBD_MD_FLUSRQUOTA | OBD_MD_FLGRPQUOTA)) {
1528                 unsigned int qid[MAXQUOTAS] = { body->oa.o_uid, body->oa.o_gid };
1529
1530                 CDEBUG(D_QUOTA, "setdq for [%u %u] with valid "LPX64", flags %x\n",
1531                        body->oa.o_uid, body->oa.o_gid, body->oa.o_valid,
1532                        body->oa.o_flags);
1533                 osc_quota_setdq(cli, qid, body->oa.o_valid, body->oa.o_flags);
1534         }
1535
1536         osc_update_grant(cli, body);
1537
1538         if (rc < 0)
1539                 RETURN(rc);
1540
1541         if (aa->aa_oa->o_valid & OBD_MD_FLCKSUM)
1542                 client_cksum = aa->aa_oa->o_cksum; /* save for later */
1543
1544         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE) {
1545                 if (rc > 0) {
1546                         CERROR("Unexpected +ve rc %d\n", rc);
1547                         RETURN(-EPROTO);
1548                 }
1549                 LASSERT(req->rq_bulk->bd_nob == aa->aa_requested_nob);
1550
1551                 if (sptlrpc_cli_unwrap_bulk_write(req, req->rq_bulk))
1552                         RETURN(-EAGAIN);
1553
1554                 if ((aa->aa_oa->o_valid & OBD_MD_FLCKSUM) && client_cksum &&
1555                     check_write_checksum(&body->oa, peer, client_cksum,
1556                                          body->oa.o_cksum, aa->aa_requested_nob,
1557                                          aa->aa_page_count, aa->aa_ppga,
1558                                          cksum_type_unpack(aa->aa_oa->o_flags)))
1559                         RETURN(-EAGAIN);
1560
1561                 rc = check_write_rcs(req, aa->aa_requested_nob,aa->aa_nio_count,
1562                                      aa->aa_page_count, aa->aa_ppga);
1563                 GOTO(out, rc);
1564         }
1565
1566         /* The rest of this function executes only for OST_READs */
1567
1568         /* if unwrap_bulk failed, return -EAGAIN to retry */
1569         rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, rc);
1570         if (rc < 0)
1571                 GOTO(out, rc = -EAGAIN);
1572
1573         if (rc > aa->aa_requested_nob) {
1574                 CERROR("Unexpected rc %d (%d requested)\n", rc,
1575                        aa->aa_requested_nob);
1576                 RETURN(-EPROTO);
1577         }
1578
1579         if (rc != req->rq_bulk->bd_nob_transferred) {
1580                 CERROR ("Unexpected rc %d (%d transferred)\n",
1581                         rc, req->rq_bulk->bd_nob_transferred);
1582                 return (-EPROTO);
1583         }
1584
1585         if (rc < aa->aa_requested_nob)
1586                 handle_short_read(rc, aa->aa_page_count, aa->aa_ppga);
1587
1588         if (body->oa.o_valid & OBD_MD_FLCKSUM) {
1589                 static int cksum_counter;
1590                 __u32      server_cksum = body->oa.o_cksum;
1591                 char      *via;
1592                 char      *router;
1593                 cksum_type_t cksum_type;
1594
1595                 cksum_type = cksum_type_unpack(body->oa.o_valid &OBD_MD_FLFLAGS?
1596                                                body->oa.o_flags : 0);
1597                 client_cksum = osc_checksum_bulk(rc, aa->aa_page_count,
1598                                                  aa->aa_ppga, OST_READ,
1599                                                  cksum_type);
1600
1601                 if (peer->nid == req->rq_bulk->bd_sender) {
1602                         via = router = "";
1603                 } else {
1604                         via = " via ";
1605                         router = libcfs_nid2str(req->rq_bulk->bd_sender);
1606                 }
1607
1608                 if (server_cksum == ~0 && rc > 0) {
1609                         CERROR("Protocol error: server %s set the 'checksum' "
1610                                "bit, but didn't send a checksum.  Not fatal, "
1611                                "but please notify on http://bugs.whamcloud.com/\n",
1612                                libcfs_nid2str(peer->nid));
1613                 } else if (server_cksum != client_cksum) {
1614                         LCONSOLE_ERROR_MSG(0x133, "%s: BAD READ CHECKSUM: from "
1615                                            "%s%s%s inode "DFID" object "DOSTID
1616                                            " extent ["LPU64"-"LPU64"]\n",
1617                                            req->rq_import->imp_obd->obd_name,
1618                                            libcfs_nid2str(peer->nid),
1619                                            via, router,
1620                                            body->oa.o_valid & OBD_MD_FLFID ?
1621                                                 body->oa.o_parent_seq : (__u64)0,
1622                                            body->oa.o_valid & OBD_MD_FLFID ?
1623                                                 body->oa.o_parent_oid : 0,
1624                                            body->oa.o_valid & OBD_MD_FLFID ?
1625                                                 body->oa.o_parent_ver : 0,
1626                                            POSTID(&body->oa.o_oi),
1627                                            aa->aa_ppga[0]->off,
1628                                            aa->aa_ppga[aa->aa_page_count-1]->off +
1629                                            aa->aa_ppga[aa->aa_page_count-1]->count -
1630                                                                         1);
1631                         CERROR("client %x, server %x, cksum_type %x\n",
1632                                client_cksum, server_cksum, cksum_type);
1633                         cksum_counter = 0;
1634                         aa->aa_oa->o_cksum = client_cksum;
1635                         rc = -EAGAIN;
1636                 } else {
1637                         cksum_counter++;
1638                         CDEBUG(D_PAGE, "checksum %x confirmed\n", client_cksum);
1639                         rc = 0;
1640                 }
1641         } else if (unlikely(client_cksum)) {
1642                 static int cksum_missed;
1643
1644                 cksum_missed++;
1645                 if ((cksum_missed & (-cksum_missed)) == cksum_missed)
1646                         CERROR("Checksum %u requested from %s but not sent\n",
1647                                cksum_missed, libcfs_nid2str(peer->nid));
1648         } else {
1649                 rc = 0;
1650         }
1651 out:
1652         if (rc >= 0)
1653                 lustre_get_wire_obdo(&req->rq_import->imp_connect_data,
1654                                      aa->aa_oa, &body->oa);
1655
1656         RETURN(rc);
1657 }
1658
1659 static int osc_brw_internal(int cmd, struct obd_export *exp, struct obdo *oa,
1660                             struct lov_stripe_md *lsm,
1661                             obd_count page_count, struct brw_page **pga,
1662                             struct obd_capa *ocapa)
1663 {
1664         struct ptlrpc_request *req;
1665         int                    rc;
1666         wait_queue_head_t            waitq;
1667         int                    generation, resends = 0;
1668         struct l_wait_info     lwi;
1669
1670         ENTRY;
1671
1672         init_waitqueue_head(&waitq);
1673         generation = exp->exp_obd->u.cli.cl_import->imp_generation;
1674
1675 restart_bulk:
1676         rc = osc_brw_prep_request(cmd, &exp->exp_obd->u.cli, oa, lsm,
1677                                   page_count, pga, &req, ocapa, 0, resends);
1678         if (rc != 0)
1679                 return (rc);
1680
1681         if (resends) {
1682                 req->rq_generation_set = 1;
1683                 req->rq_import_generation = generation;
1684                 req->rq_sent = cfs_time_current_sec() + resends;
1685         }
1686
1687         rc = ptlrpc_queue_wait(req);
1688
1689         if (rc == -ETIMEDOUT && req->rq_resend) {
1690                 DEBUG_REQ(D_HA, req,  "BULK TIMEOUT");
1691                 ptlrpc_req_finished(req);
1692                 goto restart_bulk;
1693         }
1694
1695         rc = osc_brw_fini_request(req, rc);
1696
1697         ptlrpc_req_finished(req);
1698         /* When server return -EINPROGRESS, client should always retry
1699          * regardless of the number of times the bulk was resent already.*/
1700         if (osc_recoverable_error(rc)) {
1701                 resends++;
1702                 if (rc != -EINPROGRESS &&
1703                     !client_should_resend(resends, &exp->exp_obd->u.cli)) {
1704                         CERROR("%s: too many resend retries for object: "
1705                                ""DOSTID", rc = %d.\n", exp->exp_obd->obd_name,
1706                                POSTID(&oa->o_oi), rc);
1707                         goto out;
1708                 }
1709                 if (generation !=
1710                     exp->exp_obd->u.cli.cl_import->imp_generation) {
1711                         CDEBUG(D_HA, "%s: resend cross eviction for object: "
1712                                ""DOSTID", rc = %d.\n", exp->exp_obd->obd_name,
1713                                POSTID(&oa->o_oi), rc);
1714                         goto out;
1715                 }
1716
1717                 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(resends), NULL, NULL,
1718                                        NULL);
1719                 l_wait_event(waitq, 0, &lwi);
1720
1721                 goto restart_bulk;
1722         }
1723 out:
1724         if (rc == -EAGAIN || rc == -EINPROGRESS)
1725                 rc = -EIO;
1726         RETURN (rc);
1727 }
1728
1729 static int osc_brw_redo_request(struct ptlrpc_request *request,
1730                                 struct osc_brw_async_args *aa, int rc)
1731 {
1732         struct ptlrpc_request *new_req;
1733         struct osc_brw_async_args *new_aa;
1734         struct osc_async_page *oap;
1735         ENTRY;
1736
1737         DEBUG_REQ(rc == -EINPROGRESS ? D_RPCTRACE : D_ERROR, request,
1738                   "redo for recoverable error %d", rc);
1739
1740         rc = osc_brw_prep_request(lustre_msg_get_opc(request->rq_reqmsg) ==
1741                                         OST_WRITE ? OBD_BRW_WRITE :OBD_BRW_READ,
1742                                   aa->aa_cli, aa->aa_oa,
1743                                   NULL /* lsm unused by osc currently */,
1744                                   aa->aa_page_count, aa->aa_ppga,
1745                                   &new_req, aa->aa_ocapa, 0, 1);
1746         if (rc)
1747                 RETURN(rc);
1748
1749         cfs_list_for_each_entry(oap, &aa->aa_oaps, oap_rpc_item) {
1750                 if (oap->oap_request != NULL) {
1751                         LASSERTF(request == oap->oap_request,
1752                                  "request %p != oap_request %p\n",
1753                                  request, oap->oap_request);
1754                         if (oap->oap_interrupted) {
1755                                 ptlrpc_req_finished(new_req);
1756                                 RETURN(-EINTR);
1757                         }
1758                 }
1759         }
1760         /* New request takes over pga and oaps from old request.
1761          * Note that copying a list_head doesn't work, need to move it... */
1762         aa->aa_resends++;
1763         new_req->rq_interpret_reply = request->rq_interpret_reply;
1764         new_req->rq_async_args = request->rq_async_args;
1765         new_req->rq_commit_cb = request->rq_commit_cb;
1766         /* cap resend delay to the current request timeout, this is similar to
1767          * what ptlrpc does (see after_reply()) */
1768         if (aa->aa_resends > new_req->rq_timeout)
1769                 new_req->rq_sent = cfs_time_current_sec() + new_req->rq_timeout;
1770         else
1771                 new_req->rq_sent = cfs_time_current_sec() + aa->aa_resends;
1772         new_req->rq_generation_set = 1;
1773         new_req->rq_import_generation = request->rq_import_generation;
1774
1775         new_aa = ptlrpc_req_async_args(new_req);
1776
1777         CFS_INIT_LIST_HEAD(&new_aa->aa_oaps);
1778         cfs_list_splice_init(&aa->aa_oaps, &new_aa->aa_oaps);
1779         CFS_INIT_LIST_HEAD(&new_aa->aa_exts);
1780         cfs_list_splice_init(&aa->aa_exts, &new_aa->aa_exts);
1781         new_aa->aa_resends = aa->aa_resends;
1782
1783         cfs_list_for_each_entry(oap, &new_aa->aa_oaps, oap_rpc_item) {
1784                 if (oap->oap_request) {
1785                         ptlrpc_req_finished(oap->oap_request);
1786                         oap->oap_request = ptlrpc_request_addref(new_req);
1787                 }
1788         }
1789
1790         new_aa->aa_ocapa = aa->aa_ocapa;
1791         aa->aa_ocapa = NULL;
1792
1793         /* XXX: This code will run into problem if we're going to support
1794          * to add a series of BRW RPCs into a self-defined ptlrpc_request_set
1795          * and wait for all of them to be finished. We should inherit request
1796          * set from old request. */
1797         ptlrpcd_add_req(new_req, PDL_POLICY_SAME, -1);
1798
1799         DEBUG_REQ(D_INFO, new_req, "new request");
1800         RETURN(0);
1801 }
1802
1803 /*
1804  * ugh, we want disk allocation on the target to happen in offset order.  we'll
1805  * follow sedgewicks advice and stick to the dead simple shellsort -- it'll do
1806  * fine for our small page arrays and doesn't require allocation.  its an
1807  * insertion sort that swaps elements that are strides apart, shrinking the
1808  * stride down until its '1' and the array is sorted.
1809  */
1810 static void sort_brw_pages(struct brw_page **array, int num)
1811 {
1812         int stride, i, j;
1813         struct brw_page *tmp;
1814
1815         if (num == 1)
1816                 return;
1817         for (stride = 1; stride < num ; stride = (stride * 3) + 1)
1818                 ;
1819
1820         do {
1821                 stride /= 3;
1822                 for (i = stride ; i < num ; i++) {
1823                         tmp = array[i];
1824                         j = i;
1825                         while (j >= stride && array[j - stride]->off > tmp->off) {
1826                                 array[j] = array[j - stride];
1827                                 j -= stride;
1828                         }
1829                         array[j] = tmp;
1830                 }
1831         } while (stride > 1);
1832 }
1833
1834 static obd_count max_unfragmented_pages(struct brw_page **pg, obd_count pages)
1835 {
1836         int count = 1;
1837         int offset;
1838         int i = 0;
1839
1840         LASSERT (pages > 0);
1841         offset = pg[i]->off & ~CFS_PAGE_MASK;
1842
1843         for (;;) {
1844                 pages--;
1845                 if (pages == 0)         /* that's all */
1846                         return count;
1847
1848                 if (offset + pg[i]->count < PAGE_CACHE_SIZE)
1849                         return count;   /* doesn't end on page boundary */
1850
1851                 i++;
1852                 offset = pg[i]->off & ~CFS_PAGE_MASK;
1853                 if (offset != 0)        /* doesn't start on page boundary */
1854                         return count;
1855
1856                 count++;
1857         }
1858 }
1859
1860 static struct brw_page **osc_build_ppga(struct brw_page *pga, obd_count count)
1861 {
1862         struct brw_page **ppga;
1863         int i;
1864
1865         OBD_ALLOC(ppga, sizeof(*ppga) * count);
1866         if (ppga == NULL)
1867                 return NULL;
1868
1869         for (i = 0; i < count; i++)
1870                 ppga[i] = pga + i;
1871         return ppga;
1872 }
1873
1874 static void osc_release_ppga(struct brw_page **ppga, obd_count count)
1875 {
1876         LASSERT(ppga != NULL);
1877         OBD_FREE(ppga, sizeof(*ppga) * count);
1878 }
1879
1880 static int osc_brw(int cmd, struct obd_export *exp, struct obd_info *oinfo,
1881                    obd_count page_count, struct brw_page *pga,
1882                    struct obd_trans_info *oti)
1883 {
1884         struct obdo *saved_oa = NULL;
1885         struct brw_page **ppga, **orig;
1886         struct obd_import *imp = class_exp2cliimp(exp);
1887         struct client_obd *cli;
1888         int rc, page_count_orig;
1889         ENTRY;
1890
1891         LASSERT((imp != NULL) && (imp->imp_obd != NULL));
1892         cli = &imp->imp_obd->u.cli;
1893
1894         if (cmd & OBD_BRW_CHECK) {
1895                 /* The caller just wants to know if there's a chance that this
1896                  * I/O can succeed */
1897
1898                 if (imp->imp_invalid)
1899                         RETURN(-EIO);
1900                 RETURN(0);
1901         }
1902
1903         /* test_brw with a failed create can trip this, maybe others. */
1904         LASSERT(cli->cl_max_pages_per_rpc);
1905
1906         rc = 0;
1907
1908         orig = ppga = osc_build_ppga(pga, page_count);
1909         if (ppga == NULL)
1910                 RETURN(-ENOMEM);
1911         page_count_orig = page_count;
1912
1913         sort_brw_pages(ppga, page_count);
1914         while (page_count) {
1915                 obd_count pages_per_brw;
1916
1917                 if (page_count > cli->cl_max_pages_per_rpc)
1918                         pages_per_brw = cli->cl_max_pages_per_rpc;
1919                 else
1920                         pages_per_brw = page_count;
1921
1922                 pages_per_brw = max_unfragmented_pages(ppga, pages_per_brw);
1923
1924                 if (saved_oa != NULL) {
1925                         /* restore previously saved oa */
1926                         *oinfo->oi_oa = *saved_oa;
1927                 } else if (page_count > pages_per_brw) {
1928                         /* save a copy of oa (brw will clobber it) */
1929                         OBDO_ALLOC(saved_oa);
1930                         if (saved_oa == NULL)
1931                                 GOTO(out, rc = -ENOMEM);
1932                         *saved_oa = *oinfo->oi_oa;
1933                 }
1934
1935                 rc = osc_brw_internal(cmd, exp, oinfo->oi_oa, oinfo->oi_md,
1936                                       pages_per_brw, ppga, oinfo->oi_capa);
1937
1938                 if (rc != 0)
1939                         break;
1940
1941                 page_count -= pages_per_brw;
1942                 ppga += pages_per_brw;
1943         }
1944
1945 out:
1946         osc_release_ppga(orig, page_count_orig);
1947
1948         if (saved_oa != NULL)
1949                 OBDO_FREE(saved_oa);
1950
1951         RETURN(rc);
1952 }
1953
1954 static int brw_interpret(const struct lu_env *env,
1955                          struct ptlrpc_request *req, void *data, int rc)
1956 {
1957         struct osc_brw_async_args *aa = data;
1958         struct osc_extent *ext;
1959         struct osc_extent *tmp;
1960         struct cl_object  *obj = NULL;
1961         struct client_obd *cli = aa->aa_cli;
1962         ENTRY;
1963
1964         rc = osc_brw_fini_request(req, rc);
1965         CDEBUG(D_INODE, "request %p aa %p rc %d\n", req, aa, rc);
1966         /* When server return -EINPROGRESS, client should always retry
1967          * regardless of the number of times the bulk was resent already. */
1968         if (osc_recoverable_error(rc)) {
1969                 if (req->rq_import_generation !=
1970                     req->rq_import->imp_generation) {
1971                         CDEBUG(D_HA, "%s: resend cross eviction for object: "
1972                                ""DOSTID", rc = %d.\n",
1973                                req->rq_import->imp_obd->obd_name,
1974                                POSTID(&aa->aa_oa->o_oi), rc);
1975                 } else if (rc == -EINPROGRESS ||
1976                     client_should_resend(aa->aa_resends, aa->aa_cli)) {
1977                         rc = osc_brw_redo_request(req, aa, rc);
1978                 } else {
1979                         CERROR("%s: too many resent retries for object: "
1980                                ""LPU64":"LPU64", rc = %d.\n",
1981                                req->rq_import->imp_obd->obd_name,
1982                                POSTID(&aa->aa_oa->o_oi), rc);
1983                 }
1984
1985                 if (rc == 0)
1986                         RETURN(0);
1987                 else if (rc == -EAGAIN || rc == -EINPROGRESS)
1988                         rc = -EIO;
1989         }
1990
1991         if (aa->aa_ocapa) {
1992                 capa_put(aa->aa_ocapa);
1993                 aa->aa_ocapa = NULL;
1994         }
1995
1996         cfs_list_for_each_entry_safe(ext, tmp, &aa->aa_exts, oe_link) {
1997                 if (obj == NULL && rc == 0) {
1998                         obj = osc2cl(ext->oe_obj);
1999                         cl_object_get(obj);
2000                 }
2001
2002                 cfs_list_del_init(&ext->oe_link);
2003                 osc_extent_finish(env, ext, 1, rc);
2004         }
2005         LASSERT(cfs_list_empty(&aa->aa_exts));
2006         LASSERT(cfs_list_empty(&aa->aa_oaps));
2007
2008         if (obj != NULL) {
2009                 struct obdo *oa = aa->aa_oa;
2010                 struct cl_attr *attr  = &osc_env_info(env)->oti_attr;
2011                 unsigned long valid = 0;
2012
2013                 LASSERT(rc == 0);
2014                 if (oa->o_valid & OBD_MD_FLBLOCKS) {
2015                         attr->cat_blocks = oa->o_blocks;
2016                         valid |= CAT_BLOCKS;
2017                 }
2018                 if (oa->o_valid & OBD_MD_FLMTIME) {
2019                         attr->cat_mtime = oa->o_mtime;
2020                         valid |= CAT_MTIME;
2021                 }
2022                 if (oa->o_valid & OBD_MD_FLATIME) {
2023                         attr->cat_atime = oa->o_atime;
2024                         valid |= CAT_ATIME;
2025                 }
2026                 if (oa->o_valid & OBD_MD_FLCTIME) {
2027                         attr->cat_ctime = oa->o_ctime;
2028                         valid |= CAT_CTIME;
2029                 }
2030                 if (valid != 0) {
2031                         cl_object_attr_lock(obj);
2032                         cl_object_attr_set(env, obj, attr, valid);
2033                         cl_object_attr_unlock(obj);
2034                 }
2035                 cl_object_put(env, obj);
2036         }
2037         OBDO_FREE(aa->aa_oa);
2038
2039         cl_req_completion(env, aa->aa_clerq, rc < 0 ? rc :
2040                           req->rq_bulk->bd_nob_transferred);
2041         osc_release_ppga(aa->aa_ppga, aa->aa_page_count);
2042         ptlrpc_lprocfs_brw(req, req->rq_bulk->bd_nob_transferred);
2043
2044         client_obd_list_lock(&cli->cl_loi_list_lock);
2045         /* We need to decrement before osc_ap_completion->osc_wake_cache_waiters
2046          * is called so we know whether to go to sync BRWs or wait for more
2047          * RPCs to complete */
2048         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE)
2049                 cli->cl_w_in_flight--;
2050         else
2051                 cli->cl_r_in_flight--;
2052         osc_wake_cache_waiters(cli);
2053         client_obd_list_unlock(&cli->cl_loi_list_lock);
2054
2055         osc_io_unplug(env, cli, NULL, PDL_POLICY_SAME);
2056         RETURN(rc);
2057 }
2058
2059 static void brw_commit(struct ptlrpc_request *req)
2060 {
2061         spin_lock(&req->rq_lock);
2062         /* If osc_inc_unstable_pages (via osc_extent_finish) races with
2063          * this called via the rq_commit_cb, I need to ensure
2064          * osc_dec_unstable_pages is still called. Otherwise unstable
2065          * pages may be leaked. */
2066         if (req->rq_unstable) {
2067                 spin_unlock(&req->rq_lock);
2068                 osc_dec_unstable_pages(req);
2069                 spin_lock(&req->rq_lock);
2070         } else {
2071                 req->rq_committed = 1;
2072         }
2073         spin_unlock(&req->rq_lock);
2074 }
2075
2076 /**
2077  * Build an RPC by the list of extent @ext_list. The caller must ensure
2078  * that the total pages in this list are NOT over max pages per RPC.
2079  * Extents in the list must be in OES_RPC state.
2080  */
2081 int osc_build_rpc(const struct lu_env *env, struct client_obd *cli,
2082                   cfs_list_t *ext_list, int cmd, pdl_policy_t pol)
2083 {
2084         struct ptlrpc_request           *req = NULL;
2085         struct osc_extent               *ext;
2086         struct brw_page                 **pga = NULL;
2087         struct osc_brw_async_args       *aa = NULL;
2088         struct obdo                     *oa = NULL;
2089         struct osc_async_page           *oap;
2090         struct osc_async_page           *tmp;
2091         struct cl_req                   *clerq = NULL;
2092         enum cl_req_type                crt = (cmd & OBD_BRW_WRITE) ? CRT_WRITE :
2093                                                                       CRT_READ;
2094         struct ldlm_lock                *lock = NULL;
2095         struct cl_req_attr              *crattr = NULL;
2096         obd_off                         starting_offset = OBD_OBJECT_EOF;
2097         obd_off                         ending_offset = 0;
2098         int                             mpflag = 0;
2099         int                             mem_tight = 0;
2100         int                             page_count = 0;
2101         int                             i;
2102         int                             rc;
2103         CFS_LIST_HEAD(rpc_list);
2104
2105         ENTRY;
2106         LASSERT(!cfs_list_empty(ext_list));
2107
2108         /* add pages into rpc_list to build BRW rpc */
2109         cfs_list_for_each_entry(ext, ext_list, oe_link) {
2110                 LASSERT(ext->oe_state == OES_RPC);
2111                 mem_tight |= ext->oe_memalloc;
2112                 cfs_list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
2113                         ++page_count;
2114                         cfs_list_add_tail(&oap->oap_rpc_item, &rpc_list);
2115                         if (starting_offset > oap->oap_obj_off)
2116                                 starting_offset = oap->oap_obj_off;
2117                         else
2118                                 LASSERT(oap->oap_page_off == 0);
2119                         if (ending_offset < oap->oap_obj_off + oap->oap_count)
2120                                 ending_offset = oap->oap_obj_off +
2121                                                 oap->oap_count;
2122                         else
2123                                 LASSERT(oap->oap_page_off + oap->oap_count ==
2124                                         PAGE_CACHE_SIZE);
2125                 }
2126         }
2127
2128         if (mem_tight)
2129                 mpflag = cfs_memory_pressure_get_and_set();
2130
2131         OBD_ALLOC(crattr, sizeof(*crattr));
2132         if (crattr == NULL)
2133                 GOTO(out, rc = -ENOMEM);
2134
2135         OBD_ALLOC(pga, sizeof(*pga) * page_count);
2136         if (pga == NULL)
2137                 GOTO(out, rc = -ENOMEM);
2138
2139         OBDO_ALLOC(oa);
2140         if (oa == NULL)
2141                 GOTO(out, rc = -ENOMEM);
2142
2143         i = 0;
2144         cfs_list_for_each_entry(oap, &rpc_list, oap_rpc_item) {
2145                 struct cl_page *page = oap2cl_page(oap);
2146                 if (clerq == NULL) {
2147                         clerq = cl_req_alloc(env, page, crt,
2148                                              1 /* only 1-object rpcs for now */);
2149                         if (IS_ERR(clerq))
2150                                 GOTO(out, rc = PTR_ERR(clerq));
2151                         lock = oap->oap_ldlm_lock;
2152                 }
2153                 if (mem_tight)
2154                         oap->oap_brw_flags |= OBD_BRW_MEMALLOC;
2155                 pga[i] = &oap->oap_brw_page;
2156                 pga[i]->off = oap->oap_obj_off + oap->oap_page_off;
2157                 CDEBUG(0, "put page %p index %lu oap %p flg %x to pga\n",
2158                        pga[i]->pg, page_index(oap->oap_page), oap,
2159                        pga[i]->flag);
2160                 i++;
2161                 cl_req_page_add(env, clerq, page);
2162         }
2163
2164         /* always get the data for the obdo for the rpc */
2165         LASSERT(clerq != NULL);
2166         crattr->cra_oa = oa;
2167         cl_req_attr_set(env, clerq, crattr, ~0ULL);
2168         if (lock) {
2169                 oa->o_handle = lock->l_remote_handle;
2170                 oa->o_valid |= OBD_MD_FLHANDLE;
2171         }
2172
2173         rc = cl_req_prep(env, clerq);
2174         if (rc != 0) {
2175                 CERROR("cl_req_prep failed: %d\n", rc);
2176                 GOTO(out, rc);
2177         }
2178
2179         sort_brw_pages(pga, page_count);
2180         rc = osc_brw_prep_request(cmd, cli, oa, NULL, page_count,
2181                         pga, &req, crattr->cra_capa, 1, 0);
2182         if (rc != 0) {
2183                 CERROR("prep_req failed: %d\n", rc);
2184                 GOTO(out, rc);
2185         }
2186
2187         req->rq_commit_cb = brw_commit;
2188         req->rq_interpret_reply = brw_interpret;
2189
2190         if (mem_tight != 0)
2191                 req->rq_memalloc = 1;
2192
2193         /* Need to update the timestamps after the request is built in case
2194          * we race with setattr (locally or in queue at OST).  If OST gets
2195          * later setattr before earlier BRW (as determined by the request xid),
2196          * the OST will not use BRW timestamps.  Sadly, there is no obvious
2197          * way to do this in a single call.  bug 10150 */
2198         cl_req_attr_set(env, clerq, crattr,
2199                         OBD_MD_FLMTIME|OBD_MD_FLCTIME|OBD_MD_FLATIME);
2200
2201         lustre_msg_set_jobid(req->rq_reqmsg, crattr->cra_jobid);
2202
2203         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
2204         aa = ptlrpc_req_async_args(req);
2205         CFS_INIT_LIST_HEAD(&aa->aa_oaps);
2206         cfs_list_splice_init(&rpc_list, &aa->aa_oaps);
2207         CFS_INIT_LIST_HEAD(&aa->aa_exts);
2208         cfs_list_splice_init(ext_list, &aa->aa_exts);
2209         aa->aa_clerq = clerq;
2210
2211         /* queued sync pages can be torn down while the pages
2212          * were between the pending list and the rpc */
2213         tmp = NULL;
2214         cfs_list_for_each_entry(oap, &aa->aa_oaps, oap_rpc_item) {
2215                 /* only one oap gets a request reference */
2216                 if (tmp == NULL)
2217                         tmp = oap;
2218                 if (oap->oap_interrupted && !req->rq_intr) {
2219                         CDEBUG(D_INODE, "oap %p in req %p interrupted\n",
2220                                         oap, req);
2221                         ptlrpc_mark_interrupted(req);
2222                 }
2223         }
2224         if (tmp != NULL)
2225                 tmp->oap_request = ptlrpc_request_addref(req);
2226
2227         client_obd_list_lock(&cli->cl_loi_list_lock);
2228         starting_offset >>= PAGE_CACHE_SHIFT;
2229         if (cmd == OBD_BRW_READ) {
2230                 cli->cl_r_in_flight++;
2231                 lprocfs_oh_tally_log2(&cli->cl_read_page_hist, page_count);
2232                 lprocfs_oh_tally(&cli->cl_read_rpc_hist, cli->cl_r_in_flight);
2233                 lprocfs_oh_tally_log2(&cli->cl_read_offset_hist,
2234                                       starting_offset + 1);
2235         } else {
2236                 cli->cl_w_in_flight++;
2237                 lprocfs_oh_tally_log2(&cli->cl_write_page_hist, page_count);
2238                 lprocfs_oh_tally(&cli->cl_write_rpc_hist, cli->cl_w_in_flight);
2239                 lprocfs_oh_tally_log2(&cli->cl_write_offset_hist,
2240                                       starting_offset + 1);
2241         }
2242         client_obd_list_unlock(&cli->cl_loi_list_lock);
2243
2244         DEBUG_REQ(D_INODE, req, "%d pages, aa %p. now %dr/%dw in flight",
2245                   page_count, aa, cli->cl_r_in_flight,
2246                   cli->cl_w_in_flight);
2247
2248         /* XXX: Maybe the caller can check the RPC bulk descriptor to
2249          * see which CPU/NUMA node the majority of pages were allocated
2250          * on, and try to assign the async RPC to the CPU core
2251          * (PDL_POLICY_PREFERRED) to reduce cross-CPU memory traffic.
2252          *
2253          * But on the other hand, we expect that multiple ptlrpcd
2254          * threads and the initial write sponsor can run in parallel,
2255          * especially when data checksum is enabled, which is CPU-bound
2256          * operation and single ptlrpcd thread cannot process in time.
2257          * So more ptlrpcd threads sharing BRW load
2258          * (with PDL_POLICY_ROUND) seems better.
2259          */
2260         ptlrpcd_add_req(req, pol, -1);
2261         rc = 0;
2262         EXIT;
2263
2264 out:
2265         if (mem_tight != 0)
2266                 cfs_memory_pressure_restore(mpflag);
2267
2268         if (crattr != NULL) {
2269                 capa_put(crattr->cra_capa);
2270                 OBD_FREE(crattr, sizeof(*crattr));
2271         }
2272
2273         if (rc != 0) {
2274                 LASSERT(req == NULL);
2275
2276                 if (oa)
2277                         OBDO_FREE(oa);
2278                 if (pga)
2279                         OBD_FREE(pga, sizeof(*pga) * page_count);
2280                 /* this should happen rarely and is pretty bad, it makes the
2281                  * pending list not follow the dirty order */
2282                 while (!cfs_list_empty(ext_list)) {
2283                         ext = cfs_list_entry(ext_list->next, struct osc_extent,
2284                                              oe_link);
2285                         cfs_list_del_init(&ext->oe_link);
2286                         osc_extent_finish(env, ext, 0, rc);
2287                 }
2288                 if (clerq && !IS_ERR(clerq))
2289                         cl_req_completion(env, clerq, rc);
2290         }
2291         RETURN(rc);
2292 }
2293
2294 static int osc_set_lock_data_with_check(struct ldlm_lock *lock,
2295                                         struct ldlm_enqueue_info *einfo)
2296 {
2297         void *data = einfo->ei_cbdata;
2298         int set = 0;
2299
2300         LASSERT(lock != NULL);
2301         LASSERT(lock->l_blocking_ast == einfo->ei_cb_bl);
2302         LASSERT(lock->l_resource->lr_type == einfo->ei_type);
2303         LASSERT(lock->l_completion_ast == einfo->ei_cb_cp);
2304         LASSERT(lock->l_glimpse_ast == einfo->ei_cb_gl);
2305
2306         lock_res_and_lock(lock);
2307         spin_lock(&osc_ast_guard);
2308
2309         if (lock->l_ast_data == NULL)
2310                 lock->l_ast_data = data;
2311         if (lock->l_ast_data == data)
2312                 set = 1;
2313
2314         spin_unlock(&osc_ast_guard);
2315         unlock_res_and_lock(lock);
2316
2317         return set;
2318 }
2319
2320 static int osc_set_data_with_check(struct lustre_handle *lockh,
2321                                    struct ldlm_enqueue_info *einfo)
2322 {
2323         struct ldlm_lock *lock = ldlm_handle2lock(lockh);
2324         int set = 0;
2325
2326         if (lock != NULL) {
2327                 set = osc_set_lock_data_with_check(lock, einfo);
2328                 LDLM_LOCK_PUT(lock);
2329         } else
2330                 CERROR("lockh %p, data %p - client evicted?\n",
2331                        lockh, einfo->ei_cbdata);
2332         return set;
2333 }
2334
2335 static int osc_change_cbdata(struct obd_export *exp, struct lov_stripe_md *lsm,
2336                              ldlm_iterator_t replace, void *data)
2337 {
2338         struct ldlm_res_id res_id;
2339         struct obd_device *obd = class_exp2obd(exp);
2340
2341         ostid_build_res_name(&lsm->lsm_oi, &res_id);
2342         ldlm_resource_iterate(obd->obd_namespace, &res_id, replace, data);
2343         return 0;
2344 }
2345
2346 /* find any ldlm lock of the inode in osc
2347  * return 0    not find
2348  *        1    find one
2349  *      < 0    error */
2350 static int osc_find_cbdata(struct obd_export *exp, struct lov_stripe_md *lsm,
2351                            ldlm_iterator_t replace, void *data)
2352 {
2353         struct ldlm_res_id res_id;
2354         struct obd_device *obd = class_exp2obd(exp);
2355         int rc = 0;
2356
2357         ostid_build_res_name(&lsm->lsm_oi, &res_id);
2358         rc = ldlm_resource_iterate(obd->obd_namespace, &res_id, replace, data);
2359         if (rc == LDLM_ITER_STOP)
2360                 return(1);
2361         if (rc == LDLM_ITER_CONTINUE)
2362                 return(0);
2363         return(rc);
2364 }
2365
2366 static int osc_enqueue_fini(struct ptlrpc_request *req, struct ost_lvb *lvb,
2367                             obd_enqueue_update_f upcall, void *cookie,
2368                             __u64 *flags, int agl, int rc)
2369 {
2370         int intent = *flags & LDLM_FL_HAS_INTENT;
2371         ENTRY;
2372
2373         if (intent) {
2374                 /* The request was created before ldlm_cli_enqueue call. */
2375                 if (rc == ELDLM_LOCK_ABORTED) {
2376                         struct ldlm_reply *rep;
2377                         rep = req_capsule_server_get(&req->rq_pill,
2378                                                      &RMF_DLM_REP);
2379
2380                         LASSERT(rep != NULL);
2381                         rep->lock_policy_res1 =
2382                                 ptlrpc_status_ntoh(rep->lock_policy_res1);
2383                         if (rep->lock_policy_res1)
2384                                 rc = rep->lock_policy_res1;
2385                 }
2386         }
2387
2388         if ((intent != 0 && rc == ELDLM_LOCK_ABORTED && agl == 0) ||
2389             (rc == 0)) {
2390                 *flags |= LDLM_FL_LVB_READY;
2391                 CDEBUG(D_INODE,"got kms "LPU64" blocks "LPU64" mtime "LPU64"\n",
2392                        lvb->lvb_size, lvb->lvb_blocks, lvb->lvb_mtime);
2393         }
2394
2395         /* Call the update callback. */
2396         rc = (*upcall)(cookie, rc);
2397         RETURN(rc);
2398 }
2399
2400 static int osc_enqueue_interpret(const struct lu_env *env,
2401                                  struct ptlrpc_request *req,
2402                                  struct osc_enqueue_args *aa, int rc)
2403 {
2404         struct ldlm_lock *lock;
2405         struct lustre_handle handle;
2406         __u32 mode;
2407         struct ost_lvb *lvb;
2408         __u32 lvb_len;
2409         __u64 *flags = aa->oa_flags;
2410
2411         /* Make a local copy of a lock handle and a mode, because aa->oa_*
2412          * might be freed anytime after lock upcall has been called. */
2413         lustre_handle_copy(&handle, aa->oa_lockh);
2414         mode = aa->oa_ei->ei_mode;
2415
2416         /* ldlm_cli_enqueue is holding a reference on the lock, so it must
2417          * be valid. */
2418         lock = ldlm_handle2lock(&handle);
2419
2420         /* Take an additional reference so that a blocking AST that
2421          * ldlm_cli_enqueue_fini() might post for a failed lock, is guaranteed
2422          * to arrive after an upcall has been executed by
2423          * osc_enqueue_fini(). */
2424         ldlm_lock_addref(&handle, mode);
2425
2426         /* Let CP AST to grant the lock first. */
2427         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 1);
2428
2429         if (aa->oa_agl && rc == ELDLM_LOCK_ABORTED) {
2430                 lvb = NULL;
2431                 lvb_len = 0;
2432         } else {
2433                 lvb = aa->oa_lvb;
2434                 lvb_len = sizeof(*aa->oa_lvb);
2435         }
2436
2437         /* Complete obtaining the lock procedure. */
2438         rc = ldlm_cli_enqueue_fini(aa->oa_exp, req, aa->oa_ei->ei_type, 1,
2439                                    mode, flags, lvb, lvb_len, &handle, rc);
2440         /* Complete osc stuff. */
2441         rc = osc_enqueue_fini(req, aa->oa_lvb, aa->oa_upcall, aa->oa_cookie,
2442                               flags, aa->oa_agl, rc);
2443
2444         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_CANCEL_RACE, 10);
2445
2446         /* Release the lock for async request. */
2447         if (lustre_handle_is_used(&handle) && rc == ELDLM_OK)
2448                 /*
2449                  * Releases a reference taken by ldlm_cli_enqueue(), if it is
2450                  * not already released by
2451                  * ldlm_cli_enqueue_fini()->failed_lock_cleanup()
2452                  */
2453                 ldlm_lock_decref(&handle, mode);
2454
2455         LASSERTF(lock != NULL, "lockh %p, req %p, aa %p - client evicted?\n",
2456                  aa->oa_lockh, req, aa);
2457         ldlm_lock_decref(&handle, mode);
2458         LDLM_LOCK_PUT(lock);
2459         return rc;
2460 }
2461
2462 void osc_update_enqueue(struct lustre_handle *lov_lockhp,
2463                         struct lov_oinfo *loi, __u64 flags,
2464                         struct ost_lvb *lvb, __u32 mode, int rc)
2465 {
2466         struct ldlm_lock *lock = ldlm_handle2lock(lov_lockhp);
2467
2468         if (rc == ELDLM_OK) {
2469                 __u64 tmp;
2470
2471                 LASSERT(lock != NULL);
2472                 loi->loi_lvb = *lvb;
2473                 tmp = loi->loi_lvb.lvb_size;
2474                 /* Extend KMS up to the end of this lock and no further
2475                  * A lock on [x,y] means a KMS of up to y + 1 bytes! */
2476                 if (tmp > lock->l_policy_data.l_extent.end)
2477                         tmp = lock->l_policy_data.l_extent.end + 1;
2478                 if (tmp >= loi->loi_kms) {
2479                         LDLM_DEBUG(lock, "lock acquired, setting rss="LPU64
2480                                    ", kms="LPU64, loi->loi_lvb.lvb_size, tmp);
2481                         loi_kms_set(loi, tmp);
2482                 } else {
2483                         LDLM_DEBUG(lock, "lock acquired, setting rss="
2484                                    LPU64"; leaving kms="LPU64", end="LPU64,
2485                                    loi->loi_lvb.lvb_size, loi->loi_kms,
2486                                    lock->l_policy_data.l_extent.end);
2487                 }
2488                 ldlm_lock_allow_match(lock);
2489         } else if (rc == ELDLM_LOCK_ABORTED && (flags & LDLM_FL_HAS_INTENT)) {
2490                 LASSERT(lock != NULL);
2491                 loi->loi_lvb = *lvb;
2492                 ldlm_lock_allow_match(lock);
2493                 CDEBUG(D_INODE, "glimpsed, setting rss="LPU64"; leaving"
2494                        " kms="LPU64"\n", loi->loi_lvb.lvb_size, loi->loi_kms);
2495                 rc = ELDLM_OK;
2496         }
2497
2498         if (lock != NULL) {
2499                 if (rc != ELDLM_OK)
2500                         ldlm_lock_fail_match(lock);
2501
2502                 LDLM_LOCK_PUT(lock);
2503         }
2504 }
2505 EXPORT_SYMBOL(osc_update_enqueue);
2506
2507 struct ptlrpc_request_set *PTLRPCD_SET = (void *)1;
2508
2509 /* When enqueuing asynchronously, locks are not ordered, we can obtain a lock
2510  * from the 2nd OSC before a lock from the 1st one. This does not deadlock with
2511  * other synchronous requests, however keeping some locks and trying to obtain
2512  * others may take a considerable amount of time in a case of ost failure; and
2513  * when other sync requests do not get released lock from a client, the client
2514  * is excluded from the cluster -- such scenarious make the life difficult, so
2515  * release locks just after they are obtained. */
2516 int osc_enqueue_base(struct obd_export *exp, struct ldlm_res_id *res_id,
2517                      __u64 *flags, ldlm_policy_data_t *policy,
2518                      struct ost_lvb *lvb, int kms_valid,
2519                      obd_enqueue_update_f upcall, void *cookie,
2520                      struct ldlm_enqueue_info *einfo,
2521                      struct lustre_handle *lockh,
2522                      struct ptlrpc_request_set *rqset, int async, int agl)
2523 {
2524         struct obd_device *obd = exp->exp_obd;
2525         struct ptlrpc_request *req = NULL;
2526         int intent = *flags & LDLM_FL_HAS_INTENT;
2527         __u64 match_lvb = (agl != 0 ? 0 : LDLM_FL_LVB_READY);
2528         ldlm_mode_t mode;
2529         int rc;
2530         ENTRY;
2531
2532         /* Filesystem lock extents are extended to page boundaries so that
2533          * dealing with the page cache is a little smoother.  */
2534         policy->l_extent.start -= policy->l_extent.start & ~CFS_PAGE_MASK;
2535         policy->l_extent.end |= ~CFS_PAGE_MASK;
2536
2537         /*
2538          * kms is not valid when either object is completely fresh (so that no
2539          * locks are cached), or object was evicted. In the latter case cached
2540          * lock cannot be used, because it would prime inode state with
2541          * potentially stale LVB.
2542          */
2543         if (!kms_valid)
2544                 goto no_match;
2545
2546         /* Next, search for already existing extent locks that will cover us */
2547         /* If we're trying to read, we also search for an existing PW lock.  The
2548          * VFS and page cache already protect us locally, so lots of readers/
2549          * writers can share a single PW lock.
2550          *
2551          * There are problems with conversion deadlocks, so instead of
2552          * converting a read lock to a write lock, we'll just enqueue a new
2553          * one.
2554          *
2555          * At some point we should cancel the read lock instead of making them
2556          * send us a blocking callback, but there are problems with canceling
2557          * locks out from other users right now, too. */
2558         mode = einfo->ei_mode;
2559         if (einfo->ei_mode == LCK_PR)
2560                 mode |= LCK_PW;
2561         mode = ldlm_lock_match(obd->obd_namespace, *flags | match_lvb, res_id,
2562                                einfo->ei_type, policy, mode, lockh, 0);
2563         if (mode) {
2564                 struct ldlm_lock *matched = ldlm_handle2lock(lockh);
2565
2566                 if ((agl != 0) && !ldlm_is_lvb_ready(matched)) {
2567                         /* For AGL, if enqueue RPC is sent but the lock is not
2568                          * granted, then skip to process this strpe.
2569                          * Return -ECANCELED to tell the caller. */
2570                         ldlm_lock_decref(lockh, mode);
2571                         LDLM_LOCK_PUT(matched);
2572                         RETURN(-ECANCELED);
2573                 } else if (osc_set_lock_data_with_check(matched, einfo)) {
2574                         *flags |= LDLM_FL_LVB_READY;
2575                         /* addref the lock only if not async requests and PW
2576                          * lock is matched whereas we asked for PR. */
2577                         if (!rqset && einfo->ei_mode != mode)
2578                                 ldlm_lock_addref(lockh, LCK_PR);
2579                         if (intent) {
2580                                 /* I would like to be able to ASSERT here that
2581                                  * rss <= kms, but I can't, for reasons which
2582                                  * are explained in lov_enqueue() */
2583                         }
2584
2585                         /* We already have a lock, and it's referenced.
2586                          *
2587                          * At this point, the cl_lock::cll_state is CLS_QUEUING,
2588                          * AGL upcall may change it to CLS_HELD directly. */
2589                         (*upcall)(cookie, ELDLM_OK);
2590
2591                         if (einfo->ei_mode != mode)
2592                                 ldlm_lock_decref(lockh, LCK_PW);
2593                         else if (rqset)
2594                                 /* For async requests, decref the lock. */
2595                                 ldlm_lock_decref(lockh, einfo->ei_mode);
2596                         LDLM_LOCK_PUT(matched);
2597                         RETURN(ELDLM_OK);
2598                 } else {
2599                         ldlm_lock_decref(lockh, mode);
2600                         LDLM_LOCK_PUT(matched);
2601                 }
2602         }
2603
2604  no_match:
2605         if (intent) {
2606                 CFS_LIST_HEAD(cancels);
2607                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
2608                                            &RQF_LDLM_ENQUEUE_LVB);
2609                 if (req == NULL)
2610                         RETURN(-ENOMEM);
2611
2612                 rc = ldlm_prep_enqueue_req(exp, req, &cancels, 0);
2613                 if (rc) {
2614                         ptlrpc_request_free(req);
2615                         RETURN(rc);
2616                 }
2617
2618                 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
2619                                      sizeof *lvb);
2620                 ptlrpc_request_set_replen(req);
2621         }
2622
2623         /* users of osc_enqueue() can pass this flag for ldlm_lock_match() */
2624         *flags &= ~LDLM_FL_BLOCK_GRANTED;
2625
2626         rc = ldlm_cli_enqueue(exp, &req, einfo, res_id, policy, flags, lvb,
2627                               sizeof(*lvb), LVB_T_OST, lockh, async);
2628         if (rqset) {
2629                 if (!rc) {
2630                         struct osc_enqueue_args *aa;
2631                         CLASSERT (sizeof(*aa) <= sizeof(req->rq_async_args));
2632                         aa = ptlrpc_req_async_args(req);
2633                         aa->oa_ei = einfo;
2634                         aa->oa_exp = exp;
2635                         aa->oa_flags  = flags;
2636                         aa->oa_upcall = upcall;
2637                         aa->oa_cookie = cookie;
2638                         aa->oa_lvb    = lvb;
2639                         aa->oa_lockh  = lockh;
2640                         aa->oa_agl    = !!agl;
2641
2642                         req->rq_interpret_reply =
2643                                 (ptlrpc_interpterer_t)osc_enqueue_interpret;
2644                         if (rqset == PTLRPCD_SET)
2645                                 ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
2646                         else
2647                                 ptlrpc_set_add_req(rqset, req);
2648                 } else if (intent) {
2649                         ptlrpc_req_finished(req);
2650                 }
2651                 RETURN(rc);
2652         }
2653
2654         rc = osc_enqueue_fini(req, lvb, upcall, cookie, flags, agl, rc);
2655         if (intent)
2656                 ptlrpc_req_finished(req);
2657
2658         RETURN(rc);
2659 }
2660
2661 static int osc_enqueue(struct obd_export *exp, struct obd_info *oinfo,
2662                        struct ldlm_enqueue_info *einfo,
2663                        struct ptlrpc_request_set *rqset)
2664 {
2665         struct ldlm_res_id res_id;
2666         int rc;
2667         ENTRY;
2668
2669         ostid_build_res_name(&oinfo->oi_md->lsm_oi, &res_id);
2670         rc = osc_enqueue_base(exp, &res_id, &oinfo->oi_flags, &oinfo->oi_policy,
2671                               &oinfo->oi_md->lsm_oinfo[0]->loi_lvb,
2672                               oinfo->oi_md->lsm_oinfo[0]->loi_kms_valid,
2673                               oinfo->oi_cb_up, oinfo, einfo, oinfo->oi_lockh,
2674                               rqset, rqset != NULL, 0);
2675         RETURN(rc);
2676 }
2677
2678 int osc_match_base(struct obd_export *exp, struct ldlm_res_id *res_id,
2679                    __u32 type, ldlm_policy_data_t *policy, __u32 mode,
2680                    __u64 *flags, void *data, struct lustre_handle *lockh,
2681                    int unref)
2682 {
2683         struct obd_device *obd = exp->exp_obd;
2684         __u64 lflags = *flags;
2685         ldlm_mode_t rc;
2686         ENTRY;
2687
2688         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_MATCH))
2689                 RETURN(-EIO);
2690
2691         /* Filesystem lock extents are extended to page boundaries so that
2692          * dealing with the page cache is a little smoother */
2693         policy->l_extent.start -= policy->l_extent.start & ~CFS_PAGE_MASK;
2694         policy->l_extent.end |= ~CFS_PAGE_MASK;
2695
2696         /* Next, search for already existing extent locks that will cover us */
2697         /* If we're trying to read, we also search for an existing PW lock.  The
2698          * VFS and page cache already protect us locally, so lots of readers/
2699          * writers can share a single PW lock. */
2700         rc = mode;
2701         if (mode == LCK_PR)
2702                 rc |= LCK_PW;
2703         rc = ldlm_lock_match(obd->obd_namespace, lflags,
2704                              res_id, type, policy, rc, lockh, unref);
2705         if (rc) {
2706                 if (data != NULL) {
2707                         if (!osc_set_data_with_check(lockh, data)) {
2708                                 if (!(lflags & LDLM_FL_TEST_LOCK))
2709                                         ldlm_lock_decref(lockh, rc);
2710                                 RETURN(0);
2711                         }
2712                 }
2713                 if (!(lflags & LDLM_FL_TEST_LOCK) && mode != rc) {
2714                         ldlm_lock_addref(lockh, LCK_PR);
2715                         ldlm_lock_decref(lockh, LCK_PW);
2716                 }
2717                 RETURN(rc);
2718         }
2719         RETURN(rc);
2720 }
2721
2722 int osc_cancel_base(struct lustre_handle *lockh, __u32 mode)
2723 {
2724         ENTRY;
2725
2726         if (unlikely(mode == LCK_GROUP))
2727                 ldlm_lock_decref_and_cancel(lockh, mode);
2728         else
2729                 ldlm_lock_decref(lockh, mode);
2730
2731         RETURN(0);
2732 }
2733
2734 static int osc_cancel(struct obd_export *exp, struct lov_stripe_md *md,
2735                       __u32 mode, struct lustre_handle *lockh)
2736 {
2737         ENTRY;
2738         RETURN(osc_cancel_base(lockh, mode));
2739 }
2740
2741 static int osc_cancel_unused(struct obd_export *exp,
2742                              struct lov_stripe_md *lsm,
2743                              ldlm_cancel_flags_t flags,
2744                              void *opaque)
2745 {
2746         struct obd_device *obd = class_exp2obd(exp);
2747         struct ldlm_res_id res_id, *resp = NULL;
2748
2749         if (lsm != NULL) {
2750                 ostid_build_res_name(&lsm->lsm_oi, &res_id);
2751                 resp = &res_id;
2752         }
2753
2754         return ldlm_cli_cancel_unused(obd->obd_namespace, resp, flags, opaque);
2755 }
2756
2757 static int osc_statfs_interpret(const struct lu_env *env,
2758                                 struct ptlrpc_request *req,
2759                                 struct osc_async_args *aa, int rc)
2760 {
2761         struct obd_statfs *msfs;
2762         ENTRY;
2763
2764         if (rc == -EBADR)
2765                 /* The request has in fact never been sent
2766                  * due to issues at a higher level (LOV).
2767                  * Exit immediately since the caller is
2768                  * aware of the problem and takes care
2769                  * of the clean up */
2770                  RETURN(rc);
2771
2772         if ((rc == -ENOTCONN || rc == -EAGAIN) &&
2773             (aa->aa_oi->oi_flags & OBD_STATFS_NODELAY))
2774                 GOTO(out, rc = 0);
2775
2776         if (rc != 0)
2777                 GOTO(out, rc);
2778
2779         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
2780         if (msfs == NULL) {
2781                 GOTO(out, rc = -EPROTO);
2782         }
2783
2784         *aa->aa_oi->oi_osfs = *msfs;
2785 out:
2786         rc = aa->aa_oi->oi_cb_up(aa->aa_oi, rc);
2787         RETURN(rc);
2788 }
2789
2790 static int osc_statfs_async(struct obd_export *exp,
2791                             struct obd_info *oinfo, __u64 max_age,
2792                             struct ptlrpc_request_set *rqset)
2793 {
2794         struct obd_device     *obd = class_exp2obd(exp);
2795         struct ptlrpc_request *req;
2796         struct osc_async_args *aa;
2797         int                    rc;
2798         ENTRY;
2799
2800         /* We could possibly pass max_age in the request (as an absolute
2801          * timestamp or a "seconds.usec ago") so the target can avoid doing
2802          * extra calls into the filesystem if that isn't necessary (e.g.
2803          * during mount that would help a bit).  Having relative timestamps
2804          * is not so great if request processing is slow, while absolute
2805          * timestamps are not ideal because they need time synchronization. */
2806         req = ptlrpc_request_alloc(obd->u.cli.cl_import, &RQF_OST_STATFS);
2807         if (req == NULL)
2808                 RETURN(-ENOMEM);
2809
2810         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
2811         if (rc) {
2812                 ptlrpc_request_free(req);
2813                 RETURN(rc);
2814         }
2815         ptlrpc_request_set_replen(req);
2816         req->rq_request_portal = OST_CREATE_PORTAL;
2817         ptlrpc_at_set_req_timeout(req);
2818
2819         if (oinfo->oi_flags & OBD_STATFS_NODELAY) {
2820                 /* procfs requests not want stat in wait for avoid deadlock */
2821                 req->rq_no_resend = 1;
2822                 req->rq_no_delay = 1;
2823         }
2824
2825         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_statfs_interpret;
2826         CLASSERT (sizeof(*aa) <= sizeof(req->rq_async_args));
2827         aa = ptlrpc_req_async_args(req);
2828         aa->aa_oi = oinfo;
2829
2830         ptlrpc_set_add_req(rqset, req);
2831         RETURN(0);
2832 }
2833
2834 static int osc_statfs(const struct lu_env *env, struct obd_export *exp,
2835                       struct obd_statfs *osfs, __u64 max_age, __u32 flags)
2836 {
2837         struct obd_device     *obd = class_exp2obd(exp);
2838         struct obd_statfs     *msfs;
2839         struct ptlrpc_request *req;
2840         struct obd_import     *imp = NULL;
2841         int rc;
2842         ENTRY;
2843
2844         /*Since the request might also come from lprocfs, so we need
2845          *sync this with client_disconnect_export Bug15684*/
2846         down_read(&obd->u.cli.cl_sem);
2847         if (obd->u.cli.cl_import)
2848                 imp = class_import_get(obd->u.cli.cl_import);
2849         up_read(&obd->u.cli.cl_sem);
2850         if (!imp)
2851                 RETURN(-ENODEV);
2852
2853         /* We could possibly pass max_age in the request (as an absolute
2854          * timestamp or a "seconds.usec ago") so the target can avoid doing
2855          * extra calls into the filesystem if that isn't necessary (e.g.
2856          * during mount that would help a bit).  Having relative timestamps
2857          * is not so great if request processing is slow, while absolute
2858          * timestamps are not ideal because they need time synchronization. */
2859         req = ptlrpc_request_alloc(imp, &RQF_OST_STATFS);
2860
2861         class_import_put(imp);
2862
2863         if (req == NULL)
2864                 RETURN(-ENOMEM);
2865
2866         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
2867         if (rc) {
2868                 ptlrpc_request_free(req);
2869                 RETURN(rc);
2870         }
2871         ptlrpc_request_set_replen(req);
2872         req->rq_request_portal = OST_CREATE_PORTAL;
2873         ptlrpc_at_set_req_timeout(req);
2874
2875         if (flags & OBD_STATFS_NODELAY) {
2876                 /* procfs requests not want stat in wait for avoid deadlock */
2877                 req->rq_no_resend = 1;
2878                 req->rq_no_delay = 1;
2879         }
2880
2881         rc = ptlrpc_queue_wait(req);
2882         if (rc)
2883                 GOTO(out, rc);
2884
2885         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
2886         if (msfs == NULL) {
2887                 GOTO(out, rc = -EPROTO);
2888         }
2889
2890         *osfs = *msfs;
2891
2892         EXIT;
2893  out:
2894         ptlrpc_req_finished(req);
2895         return rc;
2896 }
2897
2898 /* Retrieve object striping information.
2899  *
2900  * @lmmu is a pointer to an in-core struct with lmm_ost_count indicating
2901  * the maximum number of OST indices which will fit in the user buffer.
2902  * lmm_magic must be LOV_MAGIC (we only use 1 slot here).
2903  */
2904 static int osc_getstripe(struct lov_stripe_md *lsm, struct lov_user_md *lump)
2905 {
2906         /* we use lov_user_md_v3 because it is larger than lov_user_md_v1 */
2907         struct lov_user_md_v3 lum, *lumk;
2908         struct lov_user_ost_data_v1 *lmm_objects;
2909         int rc = 0, lum_size;
2910         ENTRY;
2911
2912         if (!lsm)
2913                 RETURN(-ENODATA);
2914
2915         /* we only need the header part from user space to get lmm_magic and
2916          * lmm_stripe_count, (the header part is common to v1 and v3) */
2917         lum_size = sizeof(struct lov_user_md_v1);
2918         if (copy_from_user(&lum, lump, lum_size))
2919                 RETURN(-EFAULT);
2920
2921         if ((lum.lmm_magic != LOV_USER_MAGIC_V1) &&
2922             (lum.lmm_magic != LOV_USER_MAGIC_V3))
2923                 RETURN(-EINVAL);
2924
2925         /* lov_user_md_vX and lov_mds_md_vX must have the same size */
2926         LASSERT(sizeof(struct lov_user_md_v1) == sizeof(struct lov_mds_md_v1));
2927         LASSERT(sizeof(struct lov_user_md_v3) == sizeof(struct lov_mds_md_v3));
2928         LASSERT(sizeof(lum.lmm_objects[0]) == sizeof(lumk->lmm_objects[0]));
2929
2930         /* we can use lov_mds_md_size() to compute lum_size
2931          * because lov_user_md_vX and lov_mds_md_vX have the same size */
2932         if (lum.lmm_stripe_count > 0) {
2933                 lum_size = lov_mds_md_size(lum.lmm_stripe_count, lum.lmm_magic);
2934                 OBD_ALLOC(lumk, lum_size);
2935                 if (!lumk)
2936                         RETURN(-ENOMEM);
2937
2938                 if (lum.lmm_magic == LOV_USER_MAGIC_V1)
2939                         lmm_objects =
2940                             &(((struct lov_user_md_v1 *)lumk)->lmm_objects[0]);
2941                 else
2942                         lmm_objects = &(lumk->lmm_objects[0]);
2943                 lmm_objects->l_ost_oi = lsm->lsm_oi;
2944         } else {
2945                 lum_size = lov_mds_md_size(0, lum.lmm_magic);
2946                 lumk = &lum;
2947         }
2948
2949         lumk->lmm_oi = lsm->lsm_oi;
2950         lumk->lmm_stripe_count = 1;
2951
2952         if (copy_to_user(lump, lumk, lum_size))
2953                 rc = -EFAULT;
2954
2955         if (lumk != &lum)
2956                 OBD_FREE(lumk, lum_size);
2957
2958         RETURN(rc);
2959 }
2960
2961
2962 static int osc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
2963                          void *karg, void *uarg)
2964 {
2965         struct obd_device *obd = exp->exp_obd;
2966         struct obd_ioctl_data *data = karg;
2967         int err = 0;
2968         ENTRY;
2969
2970         if (!try_module_get(THIS_MODULE)) {
2971                 CERROR("Can't get module. Is it alive?");
2972                 return -EINVAL;
2973         }
2974         switch (cmd) {
2975         case OBD_IOC_LOV_GET_CONFIG: {
2976                 char *buf;
2977                 struct lov_desc *desc;
2978                 struct obd_uuid uuid;
2979
2980                 buf = NULL;
2981                 len = 0;
2982                 if (obd_ioctl_getdata(&buf, &len, (void *)uarg))
2983                         GOTO(out, err = -EINVAL);
2984
2985                 data = (struct obd_ioctl_data *)buf;
2986
2987                 if (sizeof(*desc) > data->ioc_inllen1) {
2988                         obd_ioctl_freedata(buf, len);
2989                         GOTO(out, err = -EINVAL);
2990                 }
2991
2992                 if (data->ioc_inllen2 < sizeof(uuid)) {
2993                         obd_ioctl_freedata(buf, len);
2994                         GOTO(out, err = -EINVAL);
2995                 }
2996
2997                 desc = (struct lov_desc *)data->ioc_inlbuf1;
2998                 desc->ld_tgt_count = 1;
2999                 desc->ld_active_tgt_count = 1;
3000                 desc->ld_default_stripe_count = 1;
3001                 desc->ld_default_stripe_size = 0;
3002                 desc->ld_default_stripe_offset = 0;
3003                 desc->ld_pattern = 0;
3004                 memcpy(&desc->ld_uuid, &obd->obd_uuid, sizeof(uuid));
3005
3006                 memcpy(data->ioc_inlbuf2, &obd->obd_uuid, sizeof(uuid));
3007
3008                 err = copy_to_user((void *)uarg, buf, len);
3009                 if (err)
3010                         err = -EFAULT;
3011                 obd_ioctl_freedata(buf, len);
3012                 GOTO(out, err);
3013         }
3014         case LL_IOC_LOV_SETSTRIPE:
3015                 err = obd_alloc_memmd(exp, karg);
3016                 if (err > 0)
3017                         err = 0;
3018                 GOTO(out, err);
3019         case LL_IOC_LOV_GETSTRIPE:
3020                 err = osc_getstripe(karg, uarg);
3021                 GOTO(out, err);
3022         case OBD_IOC_CLIENT_RECOVER:
3023                 err = ptlrpc_recover_import(obd->u.cli.cl_import,
3024                                             data->ioc_inlbuf1, 0);
3025                 if (err > 0)
3026                         err = 0;
3027                 GOTO(out, err);
3028         case IOC_OSC_SET_ACTIVE:
3029                 err = ptlrpc_set_import_active(obd->u.cli.cl_import,
3030                                                data->ioc_offset);
3031                 GOTO(out, err);
3032         case OBD_IOC_POLL_QUOTACHECK:
3033                 err = osc_quota_poll_check(exp, (struct if_quotacheck *)karg);
3034                 GOTO(out, err);
3035         case OBD_IOC_PING_TARGET:
3036                 err = ptlrpc_obd_ping(obd);
3037                 GOTO(out, err);
3038         default:
3039                 CDEBUG(D_INODE, "unrecognised ioctl %#x by %s\n",
3040                        cmd, current_comm());
3041                 GOTO(out, err = -ENOTTY);
3042         }
3043 out:
3044         module_put(THIS_MODULE);
3045         return err;
3046 }
3047
3048 static int osc_get_info(const struct lu_env *env, struct obd_export *exp,
3049                         obd_count keylen, void *key, __u32 *vallen, void *val,
3050                         struct lov_stripe_md *lsm)
3051 {
3052         ENTRY;
3053         if (!vallen || !val)
3054                 RETURN(-EFAULT);
3055
3056         if (KEY_IS(KEY_LOCK_TO_STRIPE)) {
3057                 __u32 *stripe = val;
3058                 *vallen = sizeof(*stripe);
3059                 *stripe = 0;
3060                 RETURN(0);
3061         } else if (KEY_IS(KEY_LAST_ID)) {
3062                 struct ptlrpc_request *req;
3063                 obd_id                *reply;
3064                 char                  *tmp;
3065                 int                    rc;
3066
3067                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
3068                                            &RQF_OST_GET_INFO_LAST_ID);
3069                 if (req == NULL)
3070                         RETURN(-ENOMEM);
3071
3072                 req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
3073                                      RCL_CLIENT, keylen);
3074                 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
3075                 if (rc) {
3076                         ptlrpc_request_free(req);
3077                         RETURN(rc);
3078                 }
3079
3080                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
3081                 memcpy(tmp, key, keylen);
3082
3083                 req->rq_no_delay = req->rq_no_resend = 1;
3084                 ptlrpc_request_set_replen(req);
3085                 rc = ptlrpc_queue_wait(req);
3086                 if (rc)
3087                         GOTO(out, rc);
3088
3089                 reply = req_capsule_server_get(&req->rq_pill, &RMF_OBD_ID);
3090                 if (reply == NULL)
3091                         GOTO(out, rc = -EPROTO);
3092
3093                 *((obd_id *)val) = *reply;
3094         out:
3095                 ptlrpc_req_finished(req);
3096                 RETURN(rc);
3097         } else if (KEY_IS(KEY_FIEMAP)) {
3098                 struct ll_fiemap_info_key *fm_key =
3099                                 (struct ll_fiemap_info_key *)key;
3100                 struct ldlm_res_id       res_id;
3101                 ldlm_policy_data_t       policy;
3102                 struct lustre_handle     lockh;
3103                 ldlm_mode_t              mode = 0;
3104                 struct ptlrpc_request   *req;
3105                 struct ll_user_fiemap   *reply;
3106                 char                    *tmp;
3107                 int                      rc;
3108
3109                 if (!(fm_key->fiemap.fm_flags & FIEMAP_FLAG_SYNC))
3110                         goto skip_locking;
3111
3112                 policy.l_extent.start = fm_key->fiemap.fm_start &
3113                                                 CFS_PAGE_MASK;
3114
3115                 if (OBD_OBJECT_EOF - fm_key->fiemap.fm_length <=
3116                     fm_key->fiemap.fm_start + PAGE_CACHE_SIZE - 1)
3117                         policy.l_extent.end = OBD_OBJECT_EOF;
3118                 else
3119                         policy.l_extent.end = (fm_key->fiemap.fm_start +
3120                                 fm_key->fiemap.fm_length +
3121                                 PAGE_CACHE_SIZE - 1) & CFS_PAGE_MASK;
3122
3123                 ostid_build_res_name(&fm_key->oa.o_oi, &res_id);
3124                 mode = ldlm_lock_match(exp->exp_obd->obd_namespace,
3125                                        LDLM_FL_BLOCK_GRANTED |
3126                                        LDLM_FL_LVB_READY,
3127                                        &res_id, LDLM_EXTENT, &policy,
3128                                        LCK_PR | LCK_PW, &lockh, 0);
3129                 if (mode) { /* lock is cached on client */
3130                         if (mode != LCK_PR) {
3131                                 ldlm_lock_addref(&lockh, LCK_PR);
3132                                 ldlm_lock_decref(&lockh, LCK_PW);
3133                         }
3134                 } else { /* no cached lock, needs acquire lock on server side */
3135                         fm_key->oa.o_valid |= OBD_MD_FLFLAGS;
3136                         fm_key->oa.o_flags |= OBD_FL_SRVLOCK;
3137                 }
3138
3139 skip_locking:
3140                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
3141                                            &RQF_OST_GET_INFO_FIEMAP);
3142                 if (req == NULL)
3143                         GOTO(drop_lock, rc = -ENOMEM);
3144
3145                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_KEY,
3146                                      RCL_CLIENT, keylen);
3147                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_VAL,
3148                                      RCL_CLIENT, *vallen);
3149                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_VAL,
3150                                      RCL_SERVER, *vallen);
3151
3152                 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
3153                 if (rc) {
3154                         ptlrpc_request_free(req);
3155                         GOTO(drop_lock, rc);
3156                 }
3157
3158                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_FIEMAP_KEY);
3159                 memcpy(tmp, key, keylen);
3160                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_FIEMAP_VAL);
3161                 memcpy(tmp, val, *vallen);
3162
3163                 ptlrpc_request_set_replen(req);
3164                 rc = ptlrpc_queue_wait(req);
3165                 if (rc)
3166                         GOTO(fini_req, rc);
3167
3168                 reply = req_capsule_server_get(&req->rq_pill, &RMF_FIEMAP_VAL);
3169                 if (reply == NULL)
3170                         GOTO(fini_req, rc = -EPROTO);
3171
3172                 memcpy(val, reply, *vallen);
3173 fini_req:
3174                 ptlrpc_req_finished(req);
3175 drop_lock:
3176                 if (mode)
3177                         ldlm_lock_decref(&lockh, LCK_PR);
3178                 RETURN(rc);
3179         }
3180
3181         RETURN(-EINVAL);
3182 }
3183
3184 static int osc_set_info_async(const struct lu_env *env, struct obd_export *exp,
3185                               obd_count keylen, void *key, obd_count vallen,
3186                               void *val, struct ptlrpc_request_set *set)
3187 {
3188         struct ptlrpc_request *req;
3189         struct obd_device     *obd = exp->exp_obd;
3190         struct obd_import     *imp = class_exp2cliimp(exp);
3191         char                  *tmp;
3192         int                    rc;
3193         ENTRY;
3194
3195         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_SHUTDOWN, 10);
3196
3197         if (KEY_IS(KEY_CHECKSUM)) {
3198                 if (vallen != sizeof(int))
3199                         RETURN(-EINVAL);
3200                 exp->exp_obd->u.cli.cl_checksum = (*(int *)val) ? 1 : 0;
3201                 RETURN(0);
3202         }
3203
3204         if (KEY_IS(KEY_SPTLRPC_CONF)) {
3205                 sptlrpc_conf_client_adapt(obd);
3206                 RETURN(0);
3207         }
3208
3209         if (KEY_IS(KEY_FLUSH_CTX)) {
3210                 sptlrpc_import_flush_my_ctx(imp);
3211                 RETURN(0);
3212         }
3213
3214         if (KEY_IS(KEY_CACHE_SET)) {
3215                 struct client_obd *cli = &obd->u.cli;
3216
3217                 LASSERT(cli->cl_cache == NULL); /* only once */
3218                 cli->cl_cache = (struct cl_client_cache *)val;
3219                 cfs_atomic_inc(&cli->cl_cache->ccc_users);
3220                 cli->cl_lru_left = &cli->cl_cache->ccc_lru_left;
3221
3222                 /* add this osc into entity list */
3223                 LASSERT(cfs_list_empty(&cli->cl_lru_osc));
3224                 spin_lock(&cli->cl_cache->ccc_lru_lock);
3225                 cfs_list_add(&cli->cl_lru_osc, &cli->cl_cache->ccc_lru);
3226                 spin_unlock(&cli->cl_cache->ccc_lru_lock);
3227
3228                 RETURN(0);
3229         }
3230
3231         if (KEY_IS(KEY_CACHE_LRU_SHRINK)) {
3232                 struct client_obd *cli = &obd->u.cli;
3233                 int nr = cfs_atomic_read(&cli->cl_lru_in_list) >> 1;
3234                 int target = *(int *)val;
3235
3236                 nr = osc_lru_shrink(cli, min(nr, target));
3237                 *(int *)val -= nr;
3238                 RETURN(0);
3239         }
3240
3241         if (!set && !KEY_IS(KEY_GRANT_SHRINK))
3242                 RETURN(-EINVAL);
3243
3244         /* We pass all other commands directly to OST. Since nobody calls osc
3245            methods directly and everybody is supposed to go through LOV, we
3246            assume lov checked invalid values for us.
3247            The only recognised values so far are evict_by_nid and mds_conn.
3248            Even if something bad goes through, we'd get a -EINVAL from OST
3249            anyway. */
3250
3251         req = ptlrpc_request_alloc(imp, KEY_IS(KEY_GRANT_SHRINK) ?
3252                                                 &RQF_OST_SET_GRANT_INFO :
3253                                                 &RQF_OBD_SET_INFO);
3254         if (req == NULL)
3255                 RETURN(-ENOMEM);
3256
3257         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
3258                              RCL_CLIENT, keylen);
3259         if (!KEY_IS(KEY_GRANT_SHRINK))
3260                 req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_VAL,
3261                                      RCL_CLIENT, vallen);
3262         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SET_INFO);
3263         if (rc) {
3264                 ptlrpc_request_free(req);
3265                 RETURN(rc);
3266         }
3267
3268         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
3269         memcpy(tmp, key, keylen);
3270         tmp = req_capsule_client_get(&req->rq_pill, KEY_IS(KEY_GRANT_SHRINK) ?
3271                                                         &RMF_OST_BODY :
3272                                                         &RMF_SETINFO_VAL);
3273         memcpy(tmp, val, vallen);
3274
3275         if (KEY_IS(KEY_GRANT_SHRINK)) {
3276                 struct osc_grant_args *aa;
3277                 struct obdo *oa;
3278
3279                 CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
3280                 aa = ptlrpc_req_async_args(req);
3281                 OBDO_ALLOC(oa);
3282                 if (!oa) {
3283                         ptlrpc_req_finished(req);
3284                         RETURN(-ENOMEM);
3285                 }
3286                 *oa = ((struct ost_body *)val)->oa;
3287                 aa->aa_oa = oa;
3288                 req->rq_interpret_reply = osc_shrink_grant_interpret;
3289         }
3290
3291         ptlrpc_request_set_replen(req);
3292         if (!KEY_IS(KEY_GRANT_SHRINK)) {
3293                 LASSERT(set != NULL);
3294                 ptlrpc_set_add_req(set, req);
3295                 ptlrpc_check_set(NULL, set);
3296         } else
3297                 ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
3298
3299         RETURN(0);
3300 }
3301
3302
3303 static int osc_llog_init(struct obd_device *obd, struct obd_llog_group *olg,
3304                          struct obd_device *disk_obd, int *index)
3305 {
3306         /* this code is not supposed to be used with LOD/OSP
3307          * to be removed soon */
3308         LBUG();
3309         return 0;
3310 }
3311
3312 static int osc_llog_finish(struct obd_device *obd, int count)
3313 {
3314         struct llog_ctxt *ctxt;
3315
3316         ENTRY;
3317
3318         ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
3319         if (ctxt) {
3320                 llog_cat_close(NULL, ctxt->loc_handle);
3321                 llog_cleanup(NULL, ctxt);
3322         }
3323
3324         ctxt = llog_get_context(obd, LLOG_SIZE_REPL_CTXT);
3325         if (ctxt)
3326                 llog_cleanup(NULL, ctxt);
3327         RETURN(0);
3328 }
3329
3330 static int osc_reconnect(const struct lu_env *env,
3331                          struct obd_export *exp, struct obd_device *obd,
3332                          struct obd_uuid *cluuid,
3333                          struct obd_connect_data *data,
3334                          void *localdata)
3335 {
3336         struct client_obd *cli = &obd->u.cli;
3337
3338         if (data != NULL && (data->ocd_connect_flags & OBD_CONNECT_GRANT)) {
3339                 long lost_grant;
3340
3341                 client_obd_list_lock(&cli->cl_loi_list_lock);
3342                 data->ocd_grant = (cli->cl_avail_grant + cli->cl_dirty) ?:
3343                                 2 * cli_brw_size(obd);
3344                 lost_grant = cli->cl_lost_grant;
3345                 cli->cl_lost_grant = 0;
3346                 client_obd_list_unlock(&cli->cl_loi_list_lock);
3347
3348                 CDEBUG(D_RPCTRACE, "ocd_connect_flags: "LPX64" ocd_version: %d"
3349                        " ocd_grant: %d, lost: %ld.\n", data->ocd_connect_flags,
3350                        data->ocd_version, data->ocd_grant, lost_grant);
3351         }
3352
3353         RETURN(0);
3354 }
3355
3356 static int osc_disconnect(struct obd_export *exp)
3357 {
3358         struct obd_device *obd = class_exp2obd(exp);
3359         struct llog_ctxt  *ctxt;
3360         int rc;
3361
3362         ctxt = llog_get_context(obd, LLOG_SIZE_REPL_CTXT);
3363         if (ctxt) {
3364                 if (obd->u.cli.cl_conn_count == 1) {
3365                         /* Flush any remaining cancel messages out to the
3366                          * target */
3367                         llog_sync(ctxt, exp, 0);
3368                 }
3369                 llog_ctxt_put(ctxt);
3370         } else {
3371                 CDEBUG(D_HA, "No LLOG_SIZE_REPL_CTXT found in obd %p\n",
3372                        obd);
3373         }
3374
3375         rc = client_disconnect_export(exp);
3376         /**
3377          * Initially we put del_shrink_grant before disconnect_export, but it
3378          * causes the following problem if setup (connect) and cleanup
3379          * (disconnect) are tangled together.
3380          *      connect p1                     disconnect p2
3381          *   ptlrpc_connect_import
3382          *     ...............               class_manual_cleanup
3383          *                                     osc_disconnect
3384          *                                     del_shrink_grant
3385          *   ptlrpc_connect_interrupt
3386          *     init_grant_shrink
3387          *   add this client to shrink list
3388          *                                      cleanup_osc
3389          * Bang! pinger trigger the shrink.
3390          * So the osc should be disconnected from the shrink list, after we
3391          * are sure the import has been destroyed. BUG18662
3392          */
3393         if (obd->u.cli.cl_import == NULL)
3394                 osc_del_shrink_grant(&obd->u.cli);
3395         return rc;
3396 }
3397
3398 static int osc_import_event(struct obd_device *obd,
3399                             struct obd_import *imp,
3400                             enum obd_import_event event)
3401 {
3402         struct client_obd *cli;
3403         int rc = 0;
3404
3405         ENTRY;
3406         LASSERT(imp->imp_obd == obd);
3407
3408         switch (event) {
3409         case IMP_EVENT_DISCON: {
3410                 cli = &obd->u.cli;
3411                 client_obd_list_lock(&cli->cl_loi_list_lock);
3412                 cli->cl_avail_grant = 0;
3413                 cli->cl_lost_grant = 0;
3414                 client_obd_list_unlock(&cli->cl_loi_list_lock);
3415                 break;
3416         }
3417         case IMP_EVENT_INACTIVE: {
3418                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_INACTIVE, NULL);
3419                 break;
3420         }
3421         case IMP_EVENT_INVALIDATE: {
3422                 struct ldlm_namespace *ns = obd->obd_namespace;
3423                 struct lu_env         *env;
3424                 int                    refcheck;
3425
3426                 env = cl_env_get(&refcheck);
3427                 if (!IS_ERR(env)) {
3428                         /* Reset grants */
3429                         cli = &obd->u.cli;
3430                         /* all pages go to failing rpcs due to the invalid
3431                          * import */
3432                         osc_io_unplug(env, cli, NULL, PDL_POLICY_ROUND);
3433
3434                         ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
3435                         cl_env_put(env, &refcheck);
3436                 } else
3437                         rc = PTR_ERR(env);
3438                 break;
3439         }
3440         case IMP_EVENT_ACTIVE: {
3441                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVE, NULL);
3442                 break;
3443         }
3444         case IMP_EVENT_OCD: {
3445                 struct obd_connect_data *ocd = &imp->imp_connect_data;
3446
3447                 if (ocd->ocd_connect_flags & OBD_CONNECT_GRANT)
3448                         osc_init_grant(&obd->u.cli, ocd);
3449
3450                 /* See bug 7198 */
3451                 if (ocd->ocd_connect_flags & OBD_CONNECT_REQPORTAL)
3452                         imp->imp_client->cli_request_portal =OST_REQUEST_PORTAL;
3453
3454                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_OCD, NULL);
3455                 break;
3456         }
3457         case IMP_EVENT_DEACTIVATE: {
3458                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_DEACTIVATE, NULL);
3459                 break;
3460         }
3461         case IMP_EVENT_ACTIVATE: {
3462                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVATE, NULL);
3463                 break;
3464         }
3465         default:
3466                 CERROR("Unknown import event %d\n", event);
3467                 LBUG();
3468         }
3469         RETURN(rc);
3470 }
3471
3472 /**
3473  * Determine whether the lock can be canceled before replaying the lock
3474  * during recovery, see bug16774 for detailed information.
3475  *
3476  * \retval zero the lock can't be canceled
3477  * \retval other ok to cancel
3478  */
3479 static int osc_cancel_for_recovery(struct ldlm_lock *lock)
3480 {
3481         check_res_locked(lock->l_resource);
3482
3483         /*
3484          * Cancel all unused extent lock in granted mode LCK_PR or LCK_CR.
3485          *
3486          * XXX as a future improvement, we can also cancel unused write lock
3487          * if it doesn't have dirty data and active mmaps.
3488          */
3489         if (lock->l_resource->lr_type == LDLM_EXTENT &&
3490             (lock->l_granted_mode == LCK_PR ||
3491              lock->l_granted_mode == LCK_CR) &&
3492             (osc_dlm_lock_pageref(lock) == 0))
3493                 RETURN(1);
3494
3495         RETURN(0);
3496 }
3497
3498 static int brw_queue_work(const struct lu_env *env, void *data)
3499 {
3500         struct client_obd *cli = data;
3501
3502         CDEBUG(D_CACHE, "Run writeback work for client obd %p.\n", cli);
3503
3504         osc_io_unplug(env, cli, NULL, PDL_POLICY_SAME);
3505         RETURN(0);
3506 }
3507
3508 int osc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
3509 {
3510         struct lprocfs_static_vars lvars = { 0 };
3511         struct client_obd          *cli = &obd->u.cli;
3512         void                       *handler;
3513         int                        rc;
3514         ENTRY;
3515
3516         rc = ptlrpcd_addref();
3517         if (rc)
3518                 RETURN(rc);
3519
3520         rc = client_obd_setup(obd, lcfg);
3521         if (rc)
3522                 GOTO(out_ptlrpcd, rc);
3523
3524         handler = ptlrpcd_alloc_work(cli->cl_import, brw_queue_work, cli);
3525         if (IS_ERR(handler))
3526                 GOTO(out_client_setup, rc = PTR_ERR(handler));
3527         cli->cl_writeback_work = handler;
3528
3529         rc = osc_quota_setup(obd);
3530         if (rc)
3531                 GOTO(out_ptlrpcd_work, rc);
3532
3533         cli->cl_grant_shrink_interval = GRANT_SHRINK_INTERVAL;
3534         lprocfs_osc_init_vars(&lvars);
3535         if (lprocfs_obd_setup(obd, lvars.obd_vars) == 0) {
3536                 lproc_osc_attach_seqstat(obd);
3537                 sptlrpc_lprocfs_cliobd_attach(obd);
3538                 ptlrpc_lprocfs_register_obd(obd);
3539         }
3540
3541         /* We need to allocate a few requests more, because
3542          * brw_interpret tries to create new requests before freeing
3543          * previous ones, Ideally we want to have 2x max_rpcs_in_flight
3544          * reserved, but I'm afraid that might be too much wasted RAM
3545          * in fact, so 2 is just my guess and still should work. */
3546         cli->cl_import->imp_rq_pool =
3547                 ptlrpc_init_rq_pool(cli->cl_max_rpcs_in_flight + 2,
3548                                     OST_MAXREQSIZE,
3549                                     ptlrpc_add_rqs_to_pool);
3550
3551         CFS_INIT_LIST_HEAD(&cli->cl_grant_shrink_list);
3552         ns_register_cancel(obd->obd_namespace, osc_cancel_for_recovery);
3553         RETURN(rc);
3554
3555 out_ptlrpcd_work:
3556         ptlrpcd_destroy_work(handler);
3557 out_client_setup:
3558         client_obd_cleanup(obd);
3559 out_ptlrpcd:
3560         ptlrpcd_decref();
3561         RETURN(rc);
3562 }
3563
3564 static int osc_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
3565 {
3566         int rc = 0;
3567         ENTRY;
3568
3569         switch (stage) {
3570         case OBD_CLEANUP_EARLY: {
3571                 struct obd_import *imp;
3572                 imp = obd->u.cli.cl_import;
3573                 CDEBUG(D_HA, "Deactivating import %s\n", obd->obd_name);
3574                 /* ptlrpc_abort_inflight to stop an mds_lov_synchronize */
3575                 ptlrpc_deactivate_import(imp);
3576                 spin_lock(&imp->imp_lock);
3577                 imp->imp_pingable = 0;
3578                 spin_unlock(&imp->imp_lock);
3579                 break;
3580         }
3581         case OBD_CLEANUP_EXPORTS: {
3582                 struct client_obd *cli = &obd->u.cli;
3583                 /* LU-464
3584                  * for echo client, export may be on zombie list, wait for
3585                  * zombie thread to cull it, because cli.cl_import will be
3586                  * cleared in client_disconnect_export():
3587                  *   class_export_destroy() -> obd_cleanup() ->
3588                  *   echo_device_free() -> echo_client_cleanup() ->
3589                  *   obd_disconnect() -> osc_disconnect() ->
3590                  *   client_disconnect_export()
3591                  */
3592                 obd_zombie_barrier();
3593                 if (cli->cl_writeback_work) {
3594                         ptlrpcd_destroy_work(cli->cl_writeback_work);
3595                         cli->cl_writeback_work = NULL;
3596                 }
3597                 obd_cleanup_client_import(obd);
3598                 ptlrpc_lprocfs_unregister_obd(obd);
3599                 lprocfs_obd_cleanup(obd);
3600                 rc = obd_llog_finish(obd, 0);
3601                 if (rc != 0)
3602                         CERROR("failed to cleanup llogging subsystems\n");
3603                 break;
3604                 }
3605         }
3606         RETURN(rc);
3607 }
3608
3609 int osc_cleanup(struct obd_device *obd)
3610 {
3611         struct client_obd *cli = &obd->u.cli;
3612         int rc;
3613
3614         ENTRY;
3615
3616         /* lru cleanup */
3617         if (cli->cl_cache != NULL) {
3618                 LASSERT(cfs_atomic_read(&cli->cl_cache->ccc_users) > 0);
3619                 spin_lock(&cli->cl_cache->ccc_lru_lock);
3620                 cfs_list_del_init(&cli->cl_lru_osc);
3621                 spin_unlock(&cli->cl_cache->ccc_lru_lock);
3622                 cli->cl_lru_left = NULL;
3623                 cfs_atomic_dec(&cli->cl_cache->ccc_users);
3624                 cli->cl_cache = NULL;
3625         }
3626
3627         /* free memory of osc quota cache */
3628         osc_quota_cleanup(obd);
3629
3630         rc = client_obd_cleanup(obd);
3631
3632         ptlrpcd_decref();
3633         RETURN(rc);
3634 }
3635
3636 int osc_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg)
3637 {
3638         struct lprocfs_static_vars lvars = { 0 };
3639         int rc = 0;
3640
3641         lprocfs_osc_init_vars(&lvars);
3642
3643         switch (lcfg->lcfg_command) {
3644         default:
3645                 rc = class_process_proc_param(PARAM_OSC, lvars.obd_vars,
3646                                               lcfg, obd);
3647                 if (rc > 0)
3648                         rc = 0;
3649                 break;
3650         }
3651
3652         return(rc);
3653 }
3654
3655 static int osc_process_config(struct obd_device *obd, obd_count len, void *buf)
3656 {
3657         return osc_process_config_base(obd, buf);
3658 }
3659
3660 struct obd_ops osc_obd_ops = {
3661         .o_owner                = THIS_MODULE,
3662         .o_setup                = osc_setup,
3663         .o_precleanup           = osc_precleanup,
3664         .o_cleanup              = osc_cleanup,
3665         .o_add_conn             = client_import_add_conn,
3666         .o_del_conn             = client_import_del