Whamcloud - gitweb
c5bca5ec1a6e1eaecc31cfbc9d00b81d735f9d9d
[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|OBD_BRW_NOQUOTA);
1177
1178                 /* warn if we try to combine flags that we don't know to be
1179                  * safe to combine */
1180                 if (unlikely((p1->flag & mask) != (p2->flag & mask))) {
1181                         CWARN("Saw flags 0x%x and 0x%x in the same brw, please "
1182                               "report this at http://bugs.whamcloud.com/\n",
1183                               p1->flag, p2->flag);
1184                 }
1185                 return 0;
1186         }
1187
1188         return (p1->off + p1->count == p2->off);
1189 }
1190
1191 static obd_count osc_checksum_bulk(int nob, obd_count pg_count,
1192                                    struct brw_page **pga, int opc,
1193                                    cksum_type_t cksum_type)
1194 {
1195         __u32                           cksum;
1196         int                             i = 0;
1197         struct cfs_crypto_hash_desc     *hdesc;
1198         unsigned int                    bufsize;
1199         int                             err;
1200         unsigned char                   cfs_alg = cksum_obd2cfs(cksum_type);
1201
1202         LASSERT(pg_count > 0);
1203
1204         hdesc = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1205         if (IS_ERR(hdesc)) {
1206                 CERROR("Unable to initialize checksum hash %s\n",
1207                        cfs_crypto_hash_name(cfs_alg));
1208                 return PTR_ERR(hdesc);
1209         }
1210
1211         while (nob > 0 && pg_count > 0) {
1212                 int count = pga[i]->count > nob ? nob : pga[i]->count;
1213
1214                 /* corrupt the data before we compute the checksum, to
1215                  * simulate an OST->client data error */
1216                 if (i == 0 && opc == OST_READ &&
1217                     OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_RECEIVE)) {
1218                         unsigned char *ptr = kmap(pga[i]->pg);
1219                         int off = pga[i]->off & ~CFS_PAGE_MASK;
1220                         memcpy(ptr + off, "bad1", min(4, nob));
1221                         kunmap(pga[i]->pg);
1222                 }
1223                 cfs_crypto_hash_update_page(hdesc, pga[i]->pg,
1224                                   pga[i]->off & ~CFS_PAGE_MASK,
1225                                   count);
1226                 LL_CDEBUG_PAGE(D_PAGE, pga[i]->pg, "off %d\n",
1227                                (int)(pga[i]->off & ~CFS_PAGE_MASK));
1228
1229                 nob -= pga[i]->count;
1230                 pg_count--;
1231                 i++;
1232         }
1233
1234         bufsize = 4;
1235         err = cfs_crypto_hash_final(hdesc, (unsigned char *)&cksum, &bufsize);
1236
1237         if (err)
1238                 cfs_crypto_hash_final(hdesc, NULL, NULL);
1239
1240         /* For sending we only compute the wrong checksum instead
1241          * of corrupting the data so it is still correct on a redo */
1242         if (opc == OST_WRITE && OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_SEND))
1243                 cksum++;
1244
1245         return cksum;
1246 }
1247
1248 static int osc_brw_prep_request(int cmd, struct client_obd *cli,struct obdo *oa,
1249                                 struct lov_stripe_md *lsm, obd_count page_count,
1250                                 struct brw_page **pga,
1251                                 struct ptlrpc_request **reqp,
1252                                 struct obd_capa *ocapa, int reserve,
1253                                 int resend)
1254 {
1255         struct ptlrpc_request   *req;
1256         struct ptlrpc_bulk_desc *desc;
1257         struct ost_body         *body;
1258         struct obd_ioobj        *ioobj;
1259         struct niobuf_remote    *niobuf;
1260         int niocount, i, requested_nob, opc, rc;
1261         struct osc_brw_async_args *aa;
1262         struct req_capsule      *pill;
1263         struct brw_page *pg_prev;
1264
1265         ENTRY;
1266         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_BRW_PREP_REQ))
1267                 RETURN(-ENOMEM); /* Recoverable */
1268         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_BRW_PREP_REQ2))
1269                 RETURN(-EINVAL); /* Fatal */
1270
1271         if ((cmd & OBD_BRW_WRITE) != 0) {
1272                 opc = OST_WRITE;
1273                 req = ptlrpc_request_alloc_pool(cli->cl_import,
1274                                                 cli->cl_import->imp_rq_pool,
1275                                                 &RQF_OST_BRW_WRITE);
1276         } else {
1277                 opc = OST_READ;
1278                 req = ptlrpc_request_alloc(cli->cl_import, &RQF_OST_BRW_READ);
1279         }
1280         if (req == NULL)
1281                 RETURN(-ENOMEM);
1282
1283         for (niocount = i = 1; i < page_count; i++) {
1284                 if (!can_merge_pages(pga[i - 1], pga[i]))
1285                         niocount++;
1286         }
1287
1288         pill = &req->rq_pill;
1289         req_capsule_set_size(pill, &RMF_OBD_IOOBJ, RCL_CLIENT,
1290                              sizeof(*ioobj));
1291         req_capsule_set_size(pill, &RMF_NIOBUF_REMOTE, RCL_CLIENT,
1292                              niocount * sizeof(*niobuf));
1293         osc_set_capa_size(req, &RMF_CAPA1, ocapa);
1294
1295         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, opc);
1296         if (rc) {
1297                 ptlrpc_request_free(req);
1298                 RETURN(rc);
1299         }
1300         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
1301         ptlrpc_at_set_req_timeout(req);
1302         /* ask ptlrpc not to resend on EINPROGRESS since BRWs have their own
1303          * retry logic */
1304         req->rq_no_retry_einprogress = 1;
1305
1306         desc = ptlrpc_prep_bulk_imp(req, page_count,
1307                 cli->cl_import->imp_connect_data.ocd_brw_size >> LNET_MTU_BITS,
1308                 opc == OST_WRITE ? BULK_GET_SOURCE : BULK_PUT_SINK,
1309                 OST_BULK_PORTAL);
1310
1311         if (desc == NULL)
1312                 GOTO(out, rc = -ENOMEM);
1313         /* NB request now owns desc and will free it when it gets freed */
1314
1315         body = req_capsule_client_get(pill, &RMF_OST_BODY);
1316         ioobj = req_capsule_client_get(pill, &RMF_OBD_IOOBJ);
1317         niobuf = req_capsule_client_get(pill, &RMF_NIOBUF_REMOTE);
1318         LASSERT(body != NULL && ioobj != NULL && niobuf != NULL);
1319
1320         lustre_set_wire_obdo(&req->rq_import->imp_connect_data, &body->oa, oa);
1321
1322         obdo_to_ioobj(oa, ioobj);
1323         ioobj->ioo_bufcnt = niocount;
1324         /* The high bits of ioo_max_brw tells server _maximum_ number of bulks
1325          * that might be send for this request.  The actual number is decided
1326          * when the RPC is finally sent in ptlrpc_register_bulk(). It sends
1327          * "max - 1" for old client compatibility sending "0", and also so the
1328          * the actual maximum is a power-of-two number, not one less. LU-1431 */
1329         ioobj_max_brw_set(ioobj, desc->bd_md_max_brw);
1330         osc_pack_capa(req, body, ocapa);
1331         LASSERT(page_count > 0);
1332         pg_prev = pga[0];
1333         for (requested_nob = i = 0; i < page_count; i++, niobuf++) {
1334                 struct brw_page *pg = pga[i];
1335                 int poff = pg->off & ~CFS_PAGE_MASK;
1336
1337                 LASSERT(pg->count > 0);
1338                 /* make sure there is no gap in the middle of page array */
1339                 LASSERTF(page_count == 1 ||
1340                          (ergo(i == 0, poff + pg->count == PAGE_CACHE_SIZE) &&
1341                           ergo(i > 0 && i < page_count - 1,
1342                                poff == 0 && pg->count == PAGE_CACHE_SIZE)   &&
1343                           ergo(i == page_count - 1, poff == 0)),
1344                          "i: %d/%d pg: %p off: "LPU64", count: %u\n",
1345                          i, page_count, pg, pg->off, pg->count);
1346 #ifdef __linux__
1347                 LASSERTF(i == 0 || pg->off > pg_prev->off,
1348                          "i %d p_c %u pg %p [pri %lu ind %lu] off "LPU64
1349                          " prev_pg %p [pri %lu ind %lu] off "LPU64"\n",
1350                          i, page_count,
1351                          pg->pg, page_private(pg->pg), pg->pg->index, pg->off,
1352                          pg_prev->pg, page_private(pg_prev->pg),
1353                          pg_prev->pg->index, pg_prev->off);
1354 #else
1355                 LASSERTF(i == 0 || pg->off > pg_prev->off,
1356                          "i %d p_c %u\n", i, page_count);
1357 #endif
1358                 LASSERT((pga[0]->flag & OBD_BRW_SRVLOCK) ==
1359                         (pg->flag & OBD_BRW_SRVLOCK));
1360
1361                 ptlrpc_prep_bulk_page_pin(desc, pg->pg, poff, pg->count);
1362                 requested_nob += pg->count;
1363
1364                 if (i > 0 && can_merge_pages(pg_prev, pg)) {
1365                         niobuf--;
1366                         niobuf->len += pg->count;
1367                 } else {
1368                         niobuf->offset = pg->off;
1369                         niobuf->len    = pg->count;
1370                         niobuf->flags  = pg->flag;
1371                 }
1372                 pg_prev = pg;
1373         }
1374
1375         LASSERTF((void *)(niobuf - niocount) ==
1376                 req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE),
1377                 "want %p - real %p\n", req_capsule_client_get(&req->rq_pill,
1378                 &RMF_NIOBUF_REMOTE), (void *)(niobuf - niocount));
1379
1380         osc_announce_cached(cli, &body->oa, opc == OST_WRITE ? requested_nob:0);
1381         if (resend) {
1382                 if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0) {
1383                         body->oa.o_valid |= OBD_MD_FLFLAGS;
1384                         body->oa.o_flags = 0;
1385                 }
1386                 body->oa.o_flags |= OBD_FL_RECOV_RESEND;
1387         }
1388
1389         if (osc_should_shrink_grant(cli))
1390                 osc_shrink_grant_local(cli, &body->oa);
1391
1392         /* size[REQ_REC_OFF] still sizeof (*body) */
1393         if (opc == OST_WRITE) {
1394                 if (cli->cl_checksum &&
1395                     !sptlrpc_flavor_has_bulk(&req->rq_flvr)) {
1396                         /* store cl_cksum_type in a local variable since
1397                          * it can be changed via lprocfs */
1398                         cksum_type_t cksum_type = cli->cl_cksum_type;
1399
1400                         if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0) {
1401                                 oa->o_flags &= OBD_FL_LOCAL_MASK;
1402                                 body->oa.o_flags = 0;
1403                         }
1404                         body->oa.o_flags |= cksum_type_pack(cksum_type);
1405                         body->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1406                         body->oa.o_cksum = osc_checksum_bulk(requested_nob,
1407                                                              page_count, pga,
1408                                                              OST_WRITE,
1409                                                              cksum_type);
1410                         CDEBUG(D_PAGE, "checksum at write origin: %x\n",
1411                                body->oa.o_cksum);
1412                         /* save this in 'oa', too, for later checking */
1413                         oa->o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1414                         oa->o_flags |= cksum_type_pack(cksum_type);
1415                 } else {
1416                         /* clear out the checksum flag, in case this is a
1417                          * resend but cl_checksum is no longer set. b=11238 */
1418                         oa->o_valid &= ~OBD_MD_FLCKSUM;
1419                 }
1420                 oa->o_cksum = body->oa.o_cksum;
1421                 /* 1 RC per niobuf */
1422                 req_capsule_set_size(pill, &RMF_RCS, RCL_SERVER,
1423                                      sizeof(__u32) * niocount);
1424         } else {
1425                 if (cli->cl_checksum &&
1426                     !sptlrpc_flavor_has_bulk(&req->rq_flvr)) {
1427                         if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0)
1428                                 body->oa.o_flags = 0;
1429                         body->oa.o_flags |= cksum_type_pack(cli->cl_cksum_type);
1430                         body->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1431                 }
1432         }
1433         ptlrpc_request_set_replen(req);
1434
1435         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
1436         aa = ptlrpc_req_async_args(req);
1437         aa->aa_oa = oa;
1438         aa->aa_requested_nob = requested_nob;
1439         aa->aa_nio_count = niocount;
1440         aa->aa_page_count = page_count;
1441         aa->aa_resends = 0;
1442         aa->aa_ppga = pga;
1443         aa->aa_cli = cli;
1444         CFS_INIT_LIST_HEAD(&aa->aa_oaps);
1445         if (ocapa && reserve)
1446                 aa->aa_ocapa = capa_get(ocapa);
1447
1448         *reqp = req;
1449         RETURN(0);
1450
1451  out:
1452         ptlrpc_req_finished(req);
1453         RETURN(rc);
1454 }
1455
1456 static int check_write_checksum(struct obdo *oa, const lnet_process_id_t *peer,
1457                                 __u32 client_cksum, __u32 server_cksum, int nob,
1458                                 obd_count page_count, struct brw_page **pga,
1459                                 cksum_type_t client_cksum_type)
1460 {
1461         __u32 new_cksum;
1462         char *msg;
1463         cksum_type_t cksum_type;
1464
1465         if (server_cksum == client_cksum) {
1466                 CDEBUG(D_PAGE, "checksum %x confirmed\n", client_cksum);
1467                 return 0;
1468         }
1469
1470         cksum_type = cksum_type_unpack(oa->o_valid & OBD_MD_FLFLAGS ?
1471                                        oa->o_flags : 0);
1472         new_cksum = osc_checksum_bulk(nob, page_count, pga, OST_WRITE,
1473                                       cksum_type);
1474
1475         if (cksum_type != client_cksum_type)
1476                 msg = "the server did not use the checksum type specified in "
1477                       "the original request - likely a protocol problem";
1478         else if (new_cksum == server_cksum)
1479                 msg = "changed on the client after we checksummed it - "
1480                       "likely false positive due to mmap IO (bug 11742)";
1481         else if (new_cksum == client_cksum)
1482                 msg = "changed in transit before arrival at OST";
1483         else
1484                 msg = "changed in transit AND doesn't match the original - "
1485                       "likely false positive due to mmap IO (bug 11742)";
1486
1487         LCONSOLE_ERROR_MSG(0x132, "BAD WRITE CHECKSUM: %s: from %s inode "DFID
1488                            " object "DOSTID" extent ["LPU64"-"LPU64"]\n",
1489                            msg, libcfs_nid2str(peer->nid),
1490                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : (__u64)0,
1491                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1492                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1493                            POSTID(&oa->o_oi), pga[0]->off,
1494                            pga[page_count-1]->off + pga[page_count-1]->count - 1);
1495         CERROR("original client csum %x (type %x), server csum %x (type %x), "
1496                "client csum now %x\n", client_cksum, client_cksum_type,
1497                server_cksum, cksum_type, new_cksum);
1498         return 1;
1499 }
1500
1501 /* Note rc enters this function as number of bytes transferred */
1502 static int osc_brw_fini_request(struct ptlrpc_request *req, int rc)
1503 {
1504         struct osc_brw_async_args *aa = (void *)&req->rq_async_args;
1505         const lnet_process_id_t *peer =
1506                         &req->rq_import->imp_connection->c_peer;
1507         struct client_obd *cli = aa->aa_cli;
1508         struct ost_body *body;
1509         __u32 client_cksum = 0;
1510         ENTRY;
1511
1512         if (rc < 0 && rc != -EDQUOT) {
1513                 DEBUG_REQ(D_INFO, req, "Failed request with rc = %d\n", rc);
1514                 RETURN(rc);
1515         }
1516
1517         LASSERTF(req->rq_repmsg != NULL, "rc = %d\n", rc);
1518         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
1519         if (body == NULL) {
1520                 DEBUG_REQ(D_INFO, req, "Can't unpack body\n");
1521                 RETURN(-EPROTO);
1522         }
1523
1524         /* set/clear over quota flag for a uid/gid */
1525         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE &&
1526             body->oa.o_valid & (OBD_MD_FLUSRQUOTA | OBD_MD_FLGRPQUOTA)) {
1527                 unsigned int qid[MAXQUOTAS] = { body->oa.o_uid, body->oa.o_gid };
1528
1529                 CDEBUG(D_QUOTA, "setdq for [%u %u] with valid "LPX64", flags %x\n",
1530                        body->oa.o_uid, body->oa.o_gid, body->oa.o_valid,
1531                        body->oa.o_flags);
1532                 osc_quota_setdq(cli, qid, body->oa.o_valid, body->oa.o_flags);
1533         }
1534
1535         osc_update_grant(cli, body);
1536
1537         if (rc < 0)
1538                 RETURN(rc);
1539
1540         if (aa->aa_oa->o_valid & OBD_MD_FLCKSUM)
1541                 client_cksum = aa->aa_oa->o_cksum; /* save for later */
1542
1543         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE) {
1544                 if (rc > 0) {
1545                         CERROR("Unexpected +ve rc %d\n", rc);
1546                         RETURN(-EPROTO);
1547                 }
1548                 LASSERT(req->rq_bulk->bd_nob == aa->aa_requested_nob);
1549
1550                 if (sptlrpc_cli_unwrap_bulk_write(req, req->rq_bulk))
1551                         RETURN(-EAGAIN);
1552
1553                 if ((aa->aa_oa->o_valid & OBD_MD_FLCKSUM) && client_cksum &&
1554                     check_write_checksum(&body->oa, peer, client_cksum,
1555                                          body->oa.o_cksum, aa->aa_requested_nob,
1556                                          aa->aa_page_count, aa->aa_ppga,
1557                                          cksum_type_unpack(aa->aa_oa->o_flags)))
1558                         RETURN(-EAGAIN);
1559
1560                 rc = check_write_rcs(req, aa->aa_requested_nob,aa->aa_nio_count,
1561                                      aa->aa_page_count, aa->aa_ppga);
1562                 GOTO(out, rc);
1563         }
1564
1565         /* The rest of this function executes only for OST_READs */
1566
1567         /* if unwrap_bulk failed, return -EAGAIN to retry */
1568         rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, rc);
1569         if (rc < 0)
1570                 GOTO(out, rc = -EAGAIN);
1571
1572         if (rc > aa->aa_requested_nob) {
1573                 CERROR("Unexpected rc %d (%d requested)\n", rc,
1574                        aa->aa_requested_nob);
1575                 RETURN(-EPROTO);
1576         }
1577
1578         if (rc != req->rq_bulk->bd_nob_transferred) {
1579                 CERROR ("Unexpected rc %d (%d transferred)\n",
1580                         rc, req->rq_bulk->bd_nob_transferred);
1581                 return (-EPROTO);
1582         }
1583
1584         if (rc < aa->aa_requested_nob)
1585                 handle_short_read(rc, aa->aa_page_count, aa->aa_ppga);
1586
1587         if (body->oa.o_valid & OBD_MD_FLCKSUM) {
1588                 static int cksum_counter;
1589                 __u32      server_cksum = body->oa.o_cksum;
1590                 char      *via;
1591                 char      *router;
1592                 cksum_type_t cksum_type;
1593
1594                 cksum_type = cksum_type_unpack(body->oa.o_valid &OBD_MD_FLFLAGS?
1595                                                body->oa.o_flags : 0);
1596                 client_cksum = osc_checksum_bulk(rc, aa->aa_page_count,
1597                                                  aa->aa_ppga, OST_READ,
1598                                                  cksum_type);
1599
1600                 if (peer->nid == req->rq_bulk->bd_sender) {
1601                         via = router = "";
1602                 } else {
1603                         via = " via ";
1604                         router = libcfs_nid2str(req->rq_bulk->bd_sender);
1605                 }
1606
1607                 if (server_cksum == ~0 && rc > 0) {
1608                         CERROR("Protocol error: server %s set the 'checksum' "
1609                                "bit, but didn't send a checksum.  Not fatal, "
1610                                "but please notify on http://bugs.whamcloud.com/\n",
1611                                libcfs_nid2str(peer->nid));
1612                 } else if (server_cksum != client_cksum) {
1613                         LCONSOLE_ERROR_MSG(0x133, "%s: BAD READ CHECKSUM: from "
1614                                            "%s%s%s inode "DFID" object "DOSTID
1615                                            " extent ["LPU64"-"LPU64"]\n",
1616                                            req->rq_import->imp_obd->obd_name,
1617                                            libcfs_nid2str(peer->nid),
1618                                            via, router,
1619                                            body->oa.o_valid & OBD_MD_FLFID ?
1620                                                 body->oa.o_parent_seq : (__u64)0,
1621                                            body->oa.o_valid & OBD_MD_FLFID ?
1622                                                 body->oa.o_parent_oid : 0,
1623                                            body->oa.o_valid & OBD_MD_FLFID ?
1624                                                 body->oa.o_parent_ver : 0,
1625                                            POSTID(&body->oa.o_oi),
1626                                            aa->aa_ppga[0]->off,
1627                                            aa->aa_ppga[aa->aa_page_count-1]->off +
1628                                            aa->aa_ppga[aa->aa_page_count-1]->count -
1629                                                                         1);
1630                         CERROR("client %x, server %x, cksum_type %x\n",
1631                                client_cksum, server_cksum, cksum_type);
1632                         cksum_counter = 0;
1633                         aa->aa_oa->o_cksum = client_cksum;
1634                         rc = -EAGAIN;
1635                 } else {
1636                         cksum_counter++;
1637                         CDEBUG(D_PAGE, "checksum %x confirmed\n", client_cksum);
1638                         rc = 0;
1639                 }
1640         } else if (unlikely(client_cksum)) {
1641                 static int cksum_missed;
1642
1643                 cksum_missed++;
1644                 if ((cksum_missed & (-cksum_missed)) == cksum_missed)
1645                         CERROR("Checksum %u requested from %s but not sent\n",
1646                                cksum_missed, libcfs_nid2str(peer->nid));
1647         } else {
1648                 rc = 0;
1649         }
1650 out:
1651         if (rc >= 0)
1652                 lustre_get_wire_obdo(&req->rq_import->imp_connect_data,
1653                                      aa->aa_oa, &body->oa);
1654
1655         RETURN(rc);
1656 }
1657
1658 static int osc_brw_internal(int cmd, struct obd_export *exp, struct obdo *oa,
1659                             struct lov_stripe_md *lsm,
1660                             obd_count page_count, struct brw_page **pga,
1661                             struct obd_capa *ocapa)
1662 {
1663         struct ptlrpc_request *req;
1664         int                    rc;
1665         wait_queue_head_t            waitq;
1666         int                    generation, resends = 0;
1667         struct l_wait_info     lwi;
1668
1669         ENTRY;
1670
1671         init_waitqueue_head(&waitq);
1672         generation = exp->exp_obd->u.cli.cl_import->imp_generation;
1673
1674 restart_bulk:
1675         rc = osc_brw_prep_request(cmd, &exp->exp_obd->u.cli, oa, lsm,
1676                                   page_count, pga, &req, ocapa, 0, resends);
1677         if (rc != 0)
1678                 return (rc);
1679
1680         if (resends) {
1681                 req->rq_generation_set = 1;
1682                 req->rq_import_generation = generation;
1683                 req->rq_sent = cfs_time_current_sec() + resends;
1684         }
1685
1686         rc = ptlrpc_queue_wait(req);
1687
1688         if (rc == -ETIMEDOUT && req->rq_resend) {
1689                 DEBUG_REQ(D_HA, req,  "BULK TIMEOUT");
1690                 ptlrpc_req_finished(req);
1691                 goto restart_bulk;
1692         }
1693
1694         rc = osc_brw_fini_request(req, rc);
1695
1696         ptlrpc_req_finished(req);
1697         /* When server return -EINPROGRESS, client should always retry
1698          * regardless of the number of times the bulk was resent already.*/
1699         if (osc_recoverable_error(rc)) {
1700                 resends++;
1701                 if (rc != -EINPROGRESS &&
1702                     !client_should_resend(resends, &exp->exp_obd->u.cli)) {
1703                         CERROR("%s: too many resend retries for object: "
1704                                ""DOSTID", rc = %d.\n", exp->exp_obd->obd_name,
1705                                POSTID(&oa->o_oi), rc);
1706                         goto out;
1707                 }
1708                 if (generation !=
1709                     exp->exp_obd->u.cli.cl_import->imp_generation) {
1710                         CDEBUG(D_HA, "%s: resend cross eviction for object: "
1711                                ""DOSTID", rc = %d.\n", exp->exp_obd->obd_name,
1712                                POSTID(&oa->o_oi), rc);
1713                         goto out;
1714                 }
1715
1716                 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(resends), NULL, NULL,
1717                                        NULL);
1718                 l_wait_event(waitq, 0, &lwi);
1719
1720                 goto restart_bulk;
1721         }
1722 out:
1723         if (rc == -EAGAIN || rc == -EINPROGRESS)
1724                 rc = -EIO;
1725         RETURN (rc);
1726 }
1727
1728 static int osc_brw_redo_request(struct ptlrpc_request *request,
1729                                 struct osc_brw_async_args *aa, int rc)
1730 {
1731         struct ptlrpc_request *new_req;
1732         struct osc_brw_async_args *new_aa;
1733         struct osc_async_page *oap;
1734         ENTRY;
1735
1736         DEBUG_REQ(rc == -EINPROGRESS ? D_RPCTRACE : D_ERROR, request,
1737                   "redo for recoverable error %d", rc);
1738
1739         rc = osc_brw_prep_request(lustre_msg_get_opc(request->rq_reqmsg) ==
1740                                         OST_WRITE ? OBD_BRW_WRITE :OBD_BRW_READ,
1741                                   aa->aa_cli, aa->aa_oa,
1742                                   NULL /* lsm unused by osc currently */,
1743                                   aa->aa_page_count, aa->aa_ppga,
1744                                   &new_req, aa->aa_ocapa, 0, 1);
1745         if (rc)
1746                 RETURN(rc);
1747
1748         cfs_list_for_each_entry(oap, &aa->aa_oaps, oap_rpc_item) {
1749                 if (oap->oap_request != NULL) {
1750                         LASSERTF(request == oap->oap_request,
1751                                  "request %p != oap_request %p\n",
1752                                  request, oap->oap_request);
1753                         if (oap->oap_interrupted) {
1754                                 ptlrpc_req_finished(new_req);
1755                                 RETURN(-EINTR);
1756                         }
1757                 }
1758         }
1759         /* New request takes over pga and oaps from old request.
1760          * Note that copying a list_head doesn't work, need to move it... */
1761         aa->aa_resends++;
1762         new_req->rq_interpret_reply = request->rq_interpret_reply;
1763         new_req->rq_async_args = request->rq_async_args;
1764         new_req->rq_commit_cb = request->rq_commit_cb;
1765         /* cap resend delay to the current request timeout, this is similar to
1766          * what ptlrpc does (see after_reply()) */
1767         if (aa->aa_resends > new_req->rq_timeout)
1768                 new_req->rq_sent = cfs_time_current_sec() + new_req->rq_timeout;
1769         else
1770                 new_req->rq_sent = cfs_time_current_sec() + aa->aa_resends;
1771         new_req->rq_generation_set = 1;
1772         new_req->rq_import_generation = request->rq_import_generation;
1773
1774         new_aa = ptlrpc_req_async_args(new_req);
1775
1776         CFS_INIT_LIST_HEAD(&new_aa->aa_oaps);
1777         cfs_list_splice_init(&aa->aa_oaps, &new_aa->aa_oaps);
1778         CFS_INIT_LIST_HEAD(&new_aa->aa_exts);
1779         cfs_list_splice_init(&aa->aa_exts, &new_aa->aa_exts);
1780         new_aa->aa_resends = aa->aa_resends;
1781
1782         cfs_list_for_each_entry(oap, &new_aa->aa_oaps, oap_rpc_item) {
1783                 if (oap->oap_request) {
1784                         ptlrpc_req_finished(oap->oap_request);
1785                         oap->oap_request = ptlrpc_request_addref(new_req);
1786                 }
1787         }
1788
1789         new_aa->aa_ocapa = aa->aa_ocapa;
1790         aa->aa_ocapa = NULL;
1791
1792         /* XXX: This code will run into problem if we're going to support
1793          * to add a series of BRW RPCs into a self-defined ptlrpc_request_set
1794          * and wait for all of them to be finished. We should inherit request
1795          * set from old request. */
1796         ptlrpcd_add_req(new_req, PDL_POLICY_SAME, -1);
1797
1798         DEBUG_REQ(D_INFO, new_req, "new request");
1799         RETURN(0);
1800 }
1801
1802 /*
1803  * ugh, we want disk allocation on the target to happen in offset order.  we'll
1804  * follow sedgewicks advice and stick to the dead simple shellsort -- it'll do
1805  * fine for our small page arrays and doesn't require allocation.  its an
1806  * insertion sort that swaps elements that are strides apart, shrinking the
1807  * stride down until its '1' and the array is sorted.
1808  */
1809 static void sort_brw_pages(struct brw_page **array, int num)
1810 {
1811         int stride, i, j;
1812         struct brw_page *tmp;
1813
1814         if (num == 1)
1815                 return;
1816         for (stride = 1; stride < num ; stride = (stride * 3) + 1)
1817                 ;
1818
1819         do {
1820                 stride /= 3;
1821                 for (i = stride ; i < num ; i++) {
1822                         tmp = array[i];
1823                         j = i;
1824                         while (j >= stride && array[j - stride]->off > tmp->off) {
1825                                 array[j] = array[j - stride];
1826                                 j -= stride;
1827                         }
1828                         array[j] = tmp;
1829                 }
1830         } while (stride > 1);
1831 }
1832
1833 static obd_count max_unfragmented_pages(struct brw_page **pg, obd_count pages)
1834 {
1835         int count = 1;
1836         int offset;
1837         int i = 0;
1838
1839         LASSERT (pages > 0);
1840         offset = pg[i]->off & ~CFS_PAGE_MASK;
1841
1842         for (;;) {
1843                 pages--;
1844                 if (pages == 0)         /* that's all */
1845                         return count;
1846
1847                 if (offset + pg[i]->count < PAGE_CACHE_SIZE)
1848                         return count;   /* doesn't end on page boundary */
1849
1850                 i++;
1851                 offset = pg[i]->off & ~CFS_PAGE_MASK;
1852                 if (offset != 0)        /* doesn't start on page boundary */
1853                         return count;
1854
1855                 count++;
1856         }
1857 }
1858
1859 static struct brw_page **osc_build_ppga(struct brw_page *pga, obd_count count)
1860 {
1861         struct brw_page **ppga;
1862         int i;
1863
1864         OBD_ALLOC(ppga, sizeof(*ppga) * count);
1865         if (ppga == NULL)
1866                 return NULL;
1867
1868         for (i = 0; i < count; i++)
1869                 ppga[i] = pga + i;
1870         return ppga;
1871 }
1872
1873 static void osc_release_ppga(struct brw_page **ppga, obd_count count)
1874 {
1875         LASSERT(ppga != NULL);
1876         OBD_FREE(ppga, sizeof(*ppga) * count);
1877 }
1878
1879 static int osc_brw(int cmd, struct obd_export *exp, struct obd_info *oinfo,
1880                    obd_count page_count, struct brw_page *pga,
1881                    struct obd_trans_info *oti)
1882 {
1883         struct obdo *saved_oa = NULL;
1884         struct brw_page **ppga, **orig;
1885         struct obd_import *imp = class_exp2cliimp(exp);
1886         struct client_obd *cli;
1887         int rc, page_count_orig;
1888         ENTRY;
1889
1890         LASSERT((imp != NULL) && (imp->imp_obd != NULL));
1891         cli = &imp->imp_obd->u.cli;
1892
1893         if (cmd & OBD_BRW_CHECK) {
1894                 /* The caller just wants to know if there's a chance that this
1895                  * I/O can succeed */
1896
1897                 if (imp->imp_invalid)
1898                         RETURN(-EIO);
1899                 RETURN(0);
1900         }
1901
1902         /* test_brw with a failed create can trip this, maybe others. */
1903         LASSERT(cli->cl_max_pages_per_rpc);
1904
1905         rc = 0;
1906
1907         orig = ppga = osc_build_ppga(pga, page_count);
1908         if (ppga == NULL)
1909                 RETURN(-ENOMEM);
1910         page_count_orig = page_count;
1911
1912         sort_brw_pages(ppga, page_count);
1913         while (page_count) {
1914                 obd_count pages_per_brw;
1915
1916                 if (page_count > cli->cl_max_pages_per_rpc)
1917                         pages_per_brw = cli->cl_max_pages_per_rpc;
1918                 else
1919                         pages_per_brw = page_count;
1920
1921                 pages_per_brw = max_unfragmented_pages(ppga, pages_per_brw);
1922
1923                 if (saved_oa != NULL) {
1924                         /* restore previously saved oa */
1925                         *oinfo->oi_oa = *saved_oa;
1926                 } else if (page_count > pages_per_brw) {
1927                         /* save a copy of oa (brw will clobber it) */
1928                         OBDO_ALLOC(saved_oa);
1929                         if (saved_oa == NULL)
1930                                 GOTO(out, rc = -ENOMEM);
1931                         *saved_oa = *oinfo->oi_oa;
1932                 }
1933
1934                 rc = osc_brw_internal(cmd, exp, oinfo->oi_oa, oinfo->oi_md,
1935                                       pages_per_brw, ppga, oinfo->oi_capa);
1936
1937                 if (rc != 0)
1938                         break;
1939
1940                 page_count -= pages_per_brw;
1941                 ppga += pages_per_brw;
1942         }
1943
1944 out:
1945         osc_release_ppga(orig, page_count_orig);
1946
1947         if (saved_oa != NULL)
1948                 OBDO_FREE(saved_oa);
1949
1950         RETURN(rc);
1951 }
1952
1953 static int brw_interpret(const struct lu_env *env,
1954                          struct ptlrpc_request *req, void *data, int rc)
1955 {
1956         struct osc_brw_async_args *aa = data;
1957         struct osc_extent *ext;
1958         struct osc_extent *tmp;
1959         struct cl_object  *obj = NULL;
1960         struct client_obd *cli = aa->aa_cli;
1961         ENTRY;
1962
1963         rc = osc_brw_fini_request(req, rc);
1964         CDEBUG(D_INODE, "request %p aa %p rc %d\n", req, aa, rc);
1965         /* When server return -EINPROGRESS, client should always retry
1966          * regardless of the number of times the bulk was resent already. */
1967         if (osc_recoverable_error(rc)) {
1968                 if (req->rq_import_generation !=
1969                     req->rq_import->imp_generation) {
1970                         CDEBUG(D_HA, "%s: resend cross eviction for object: "
1971                                ""DOSTID", rc = %d.\n",
1972                                req->rq_import->imp_obd->obd_name,
1973                                POSTID(&aa->aa_oa->o_oi), rc);
1974                 } else if (rc == -EINPROGRESS ||
1975                     client_should_resend(aa->aa_resends, aa->aa_cli)) {
1976                         rc = osc_brw_redo_request(req, aa, rc);
1977                 } else {
1978                         CERROR("%s: too many resent retries for object: "
1979                                ""LPU64":"LPU64", rc = %d.\n",
1980                                req->rq_import->imp_obd->obd_name,
1981                                POSTID(&aa->aa_oa->o_oi), rc);
1982                 }
1983
1984                 if (rc == 0)
1985                         RETURN(0);
1986                 else if (rc == -EAGAIN || rc == -EINPROGRESS)
1987                         rc = -EIO;
1988         }
1989
1990         if (aa->aa_ocapa) {
1991                 capa_put(aa->aa_ocapa);
1992                 aa->aa_ocapa = NULL;
1993         }
1994
1995         cfs_list_for_each_entry_safe(ext, tmp, &aa->aa_exts, oe_link) {
1996                 if (obj == NULL && rc == 0) {
1997                         obj = osc2cl(ext->oe_obj);
1998                         cl_object_get(obj);
1999                 }
2000
2001                 cfs_list_del_init(&ext->oe_link);
2002                 osc_extent_finish(env, ext, 1, rc);
2003         }
2004         LASSERT(cfs_list_empty(&aa->aa_exts));
2005         LASSERT(cfs_list_empty(&aa->aa_oaps));
2006
2007         if (obj != NULL) {
2008                 struct obdo *oa = aa->aa_oa;
2009                 struct cl_attr *attr  = &osc_env_info(env)->oti_attr;
2010                 unsigned long valid = 0;
2011
2012                 LASSERT(rc == 0);
2013                 if (oa->o_valid & OBD_MD_FLBLOCKS) {
2014                         attr->cat_blocks = oa->o_blocks;
2015                         valid |= CAT_BLOCKS;
2016                 }
2017                 if (oa->o_valid & OBD_MD_FLMTIME) {
2018                         attr->cat_mtime = oa->o_mtime;
2019                         valid |= CAT_MTIME;
2020                 }
2021                 if (oa->o_valid & OBD_MD_FLATIME) {
2022                         attr->cat_atime = oa->o_atime;
2023                         valid |= CAT_ATIME;
2024                 }
2025                 if (oa->o_valid & OBD_MD_FLCTIME) {
2026                         attr->cat_ctime = oa->o_ctime;
2027                         valid |= CAT_CTIME;
2028                 }
2029                 if (valid != 0) {
2030                         cl_object_attr_lock(obj);
2031                         cl_object_attr_set(env, obj, attr, valid);
2032                         cl_object_attr_unlock(obj);
2033                 }
2034                 cl_object_put(env, obj);
2035         }
2036         OBDO_FREE(aa->aa_oa);
2037
2038         cl_req_completion(env, aa->aa_clerq, rc < 0 ? rc :
2039                           req->rq_bulk->bd_nob_transferred);
2040         osc_release_ppga(aa->aa_ppga, aa->aa_page_count);
2041         ptlrpc_lprocfs_brw(req, req->rq_bulk->bd_nob_transferred);
2042
2043         client_obd_list_lock(&cli->cl_loi_list_lock);
2044         /* We need to decrement before osc_ap_completion->osc_wake_cache_waiters
2045          * is called so we know whether to go to sync BRWs or wait for more
2046          * RPCs to complete */
2047         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE)
2048                 cli->cl_w_in_flight--;
2049         else
2050                 cli->cl_r_in_flight--;
2051         osc_wake_cache_waiters(cli);
2052         client_obd_list_unlock(&cli->cl_loi_list_lock);
2053
2054         osc_io_unplug(env, cli, NULL, PDL_POLICY_SAME);
2055         RETURN(rc);
2056 }
2057
2058 static void brw_commit(struct ptlrpc_request *req)
2059 {
2060         spin_lock(&req->rq_lock);
2061         /* If osc_inc_unstable_pages (via osc_extent_finish) races with
2062          * this called via the rq_commit_cb, I need to ensure
2063          * osc_dec_unstable_pages is still called. Otherwise unstable
2064          * pages may be leaked. */
2065         if (req->rq_unstable) {
2066                 spin_unlock(&req->rq_lock);
2067                 osc_dec_unstable_pages(req);
2068                 spin_lock(&req->rq_lock);
2069         } else {
2070                 req->rq_committed = 1;
2071         }
2072         spin_unlock(&req->rq_lock);
2073 }
2074
2075 /**
2076  * Build an RPC by the list of extent @ext_list. The caller must ensure
2077  * that the total pages in this list are NOT over max pages per RPC.
2078  * Extents in the list must be in OES_RPC state.
2079  */
2080 int osc_build_rpc(const struct lu_env *env, struct client_obd *cli,
2081                   cfs_list_t *ext_list, int cmd, pdl_policy_t pol)
2082 {
2083         struct ptlrpc_request           *req = NULL;
2084         struct osc_extent               *ext;
2085         struct brw_page                 **pga = NULL;
2086         struct osc_brw_async_args       *aa = NULL;
2087         struct obdo                     *oa = NULL;
2088         struct osc_async_page           *oap;
2089         struct osc_async_page           *tmp;
2090         struct cl_req                   *clerq = NULL;
2091         enum cl_req_type                crt = (cmd & OBD_BRW_WRITE) ? CRT_WRITE :
2092                                                                       CRT_READ;
2093         struct ldlm_lock                *lock = NULL;
2094         struct cl_req_attr              *crattr = NULL;
2095         obd_off                         starting_offset = OBD_OBJECT_EOF;
2096         obd_off                         ending_offset = 0;
2097         int                             mpflag = 0;
2098         int                             mem_tight = 0;
2099         int                             page_count = 0;
2100         int                             i;
2101         int                             rc;
2102         CFS_LIST_HEAD(rpc_list);
2103
2104         ENTRY;
2105         LASSERT(!cfs_list_empty(ext_list));
2106
2107         /* add pages into rpc_list to build BRW rpc */
2108         cfs_list_for_each_entry(ext, ext_list, oe_link) {
2109                 LASSERT(ext->oe_state == OES_RPC);
2110                 mem_tight |= ext->oe_memalloc;
2111                 cfs_list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
2112                         ++page_count;
2113                         cfs_list_add_tail(&oap->oap_rpc_item, &rpc_list);
2114                         if (starting_offset > oap->oap_obj_off)
2115                                 starting_offset = oap->oap_obj_off;
2116                         else
2117                                 LASSERT(oap->oap_page_off == 0);
2118                         if (ending_offset < oap->oap_obj_off + oap->oap_count)
2119                                 ending_offset = oap->oap_obj_off +
2120                                                 oap->oap_count;
2121                         else
2122                                 LASSERT(oap->oap_page_off + oap->oap_count ==
2123                                         PAGE_CACHE_SIZE);
2124                 }
2125         }
2126
2127         if (mem_tight)
2128                 mpflag = cfs_memory_pressure_get_and_set();
2129
2130         OBD_ALLOC(crattr, sizeof(*crattr));
2131         if (crattr == NULL)
2132                 GOTO(out, rc = -ENOMEM);
2133
2134         OBD_ALLOC(pga, sizeof(*pga) * page_count);
2135         if (pga == NULL)
2136                 GOTO(out, rc = -ENOMEM);
2137
2138         OBDO_ALLOC(oa);
2139         if (oa == NULL)
2140                 GOTO(out, rc = -ENOMEM);
2141
2142         i = 0;
2143         cfs_list_for_each_entry(oap, &rpc_list, oap_rpc_item) {
2144                 struct cl_page *page = oap2cl_page(oap);
2145                 if (clerq == NULL) {
2146                         clerq = cl_req_alloc(env, page, crt,
2147                                              1 /* only 1-object rpcs for now */);
2148                         if (IS_ERR(clerq))
2149                                 GOTO(out, rc = PTR_ERR(clerq));
2150                         lock = oap->oap_ldlm_lock;
2151                 }
2152                 if (mem_tight)
2153                         oap->oap_brw_flags |= OBD_BRW_MEMALLOC;
2154                 pga[i] = &oap->oap_brw_page;
2155                 pga[i]->off = oap->oap_obj_off + oap->oap_page_off;
2156                 CDEBUG(0, "put page %p index %lu oap %p flg %x to pga\n",
2157                        pga[i]->pg, page_index(oap->oap_page), oap,
2158                        pga[i]->flag);
2159                 i++;
2160                 cl_req_page_add(env, clerq, page);
2161         }
2162
2163         /* always get the data for the obdo for the rpc */
2164         LASSERT(clerq != NULL);
2165         crattr->cra_oa = oa;
2166         cl_req_attr_set(env, clerq, crattr, ~0ULL);
2167         if (lock) {
2168                 oa->o_handle = lock->l_remote_handle;
2169                 oa->o_valid |= OBD_MD_FLHANDLE;
2170         }
2171
2172         rc = cl_req_prep(env, clerq);
2173         if (rc != 0) {
2174                 CERROR("cl_req_prep failed: %d\n", rc);
2175                 GOTO(out, rc);
2176         }
2177
2178         sort_brw_pages(pga, page_count);
2179         rc = osc_brw_prep_request(cmd, cli, oa, NULL, page_count,
2180                         pga, &req, crattr->cra_capa, 1, 0);
2181         if (rc != 0) {
2182                 CERROR("prep_req failed: %d\n", rc);
2183                 GOTO(out, rc);
2184         }
2185
2186         req->rq_commit_cb = brw_commit;
2187         req->rq_interpret_reply = brw_interpret;
2188
2189         if (mem_tight != 0)
2190                 req->rq_memalloc = 1;
2191
2192         /* Need to update the timestamps after the request is built in case
2193          * we race with setattr (locally or in queue at OST).  If OST gets
2194          * later setattr before earlier BRW (as determined by the request xid),
2195          * the OST will not use BRW timestamps.  Sadly, there is no obvious
2196          * way to do this in a single call.  bug 10150 */
2197         cl_req_attr_set(env, clerq, crattr,
2198                         OBD_MD_FLMTIME|OBD_MD_FLCTIME|OBD_MD_FLATIME);
2199
2200         lustre_msg_set_jobid(req->rq_reqmsg, crattr->cra_jobid);
2201
2202         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
2203         aa = ptlrpc_req_async_args(req);
2204         CFS_INIT_LIST_HEAD(&aa->aa_oaps);
2205         cfs_list_splice_init(&rpc_list, &aa->aa_oaps);
2206         CFS_INIT_LIST_HEAD(&aa->aa_exts);
2207         cfs_list_splice_init(ext_list, &aa->aa_exts);
2208         aa->aa_clerq = clerq;
2209
2210         /* queued sync pages can be torn down while the pages
2211          * were between the pending list and the rpc */
2212         tmp = NULL;
2213         cfs_list_for_each_entry(oap, &aa->aa_oaps, oap_rpc_item) {
2214                 /* only one oap gets a request reference */
2215                 if (tmp == NULL)
2216                         tmp = oap;
2217                 if (oap->oap_interrupted && !req->rq_intr) {
2218                         CDEBUG(D_INODE, "oap %p in req %p interrupted\n",
2219                                         oap, req);
2220                         ptlrpc_mark_interrupted(req);
2221                 }
2222         }
2223         if (tmp != NULL)
2224                 tmp->oap_request = ptlrpc_request_addref(req);
2225
2226         client_obd_list_lock(&cli->cl_loi_list_lock);
2227         starting_offset >>= PAGE_CACHE_SHIFT;
2228         if (cmd == OBD_BRW_READ) {
2229                 cli->cl_r_in_flight++;
2230                 lprocfs_oh_tally_log2(&cli->cl_read_page_hist, page_count);
2231                 lprocfs_oh_tally(&cli->cl_read_rpc_hist, cli->cl_r_in_flight);
2232                 lprocfs_oh_tally_log2(&cli->cl_read_offset_hist,
2233                                       starting_offset + 1);
2234         } else {
2235                 cli->cl_w_in_flight++;
2236                 lprocfs_oh_tally_log2(&cli->cl_write_page_hist, page_count);
2237                 lprocfs_oh_tally(&cli->cl_write_rpc_hist, cli->cl_w_in_flight);
2238                 lprocfs_oh_tally_log2(&cli->cl_write_offset_hist,
2239                                       starting_offset + 1);
2240         }
2241         client_obd_list_unlock(&cli->cl_loi_list_lock);
2242
2243         DEBUG_REQ(D_INODE, req, "%d pages, aa %p. now %dr/%dw in flight",
2244                   page_count, aa, cli->cl_r_in_flight,
2245                   cli->cl_w_in_flight);
2246
2247         /* XXX: Maybe the caller can check the RPC bulk descriptor to
2248          * see which CPU/NUMA node the majority of pages were allocated
2249          * on, and try to assign the async RPC to the CPU core
2250          * (PDL_POLICY_PREFERRED) to reduce cross-CPU memory traffic.
2251          *
2252          * But on the other hand, we expect that multiple ptlrpcd
2253          * threads and the initial write sponsor can run in parallel,
2254          * especially when data checksum is enabled, which is CPU-bound
2255          * operation and single ptlrpcd thread cannot process in time.
2256          * So more ptlrpcd threads sharing BRW load
2257          * (with PDL_POLICY_ROUND) seems better.
2258          */
2259         ptlrpcd_add_req(req, pol, -1);
2260         rc = 0;
2261         EXIT;
2262
2263 out:
2264         if (mem_tight != 0)
2265                 cfs_memory_pressure_restore(mpflag);
2266
2267         if (crattr != NULL) {
2268                 capa_put(crattr->cra_capa);
2269                 OBD_FREE(crattr, sizeof(*crattr));
2270         }
2271
2272         if (rc != 0) {
2273                 LASSERT(req == NULL);
2274
2275                 if (oa)
2276                         OBDO_FREE(oa);
2277                 if (pga)
2278                         OBD_FREE(pga, sizeof(*pga) * page_count);
2279                 /* this should happen rarely and is pretty bad, it makes the
2280                  * pending list not follow the dirty order */
2281                 while (!cfs_list_empty(ext_list)) {
2282                         ext = cfs_list_entry(ext_list->next, struct osc_extent,
2283                                              oe_link);
2284                         cfs_list_del_init(&ext->oe_link);
2285                         osc_extent_finish(env, ext, 0, rc);
2286                 }
2287                 if (clerq && !IS_ERR(clerq))
2288                         cl_req_completion(env, clerq, rc);
2289         }
2290         RETURN(rc);
2291 }
2292
2293 static int osc_set_lock_data_with_check(struct ldlm_lock *lock,
2294                                         struct ldlm_enqueue_info *einfo)
2295 {
2296         void *data = einfo->ei_cbdata;
2297         int set = 0;
2298
2299         LASSERT(lock != NULL);
2300         LASSERT(lock->l_blocking_ast == einfo->ei_cb_bl);
2301         LASSERT(lock->l_resource->lr_type == einfo->ei_type);
2302         LASSERT(lock->l_completion_ast == einfo->ei_cb_cp);
2303         LASSERT(lock->l_glimpse_ast == einfo->ei_cb_gl);
2304
2305         lock_res_and_lock(lock);
2306         spin_lock(&osc_ast_guard);
2307
2308         if (lock->l_ast_data == NULL)
2309                 lock->l_ast_data = data;
2310         if (lock->l_ast_data == data)
2311                 set = 1;
2312
2313         spin_unlock(&osc_ast_guard);
2314         unlock_res_and_lock(lock);
2315
2316         return set;
2317 }
2318
2319 static int osc_set_data_with_check(struct lustre_handle *lockh,
2320                                    struct ldlm_enqueue_info *einfo)
2321 {
2322         struct ldlm_lock *lock = ldlm_handle2lock(lockh);
2323         int set = 0;
2324
2325         if (lock != NULL) {
2326                 set = osc_set_lock_data_with_check(lock, einfo);
2327                 LDLM_LOCK_PUT(lock);
2328         } else
2329                 CERROR("lockh %p, data %p - client evicted?\n",
2330                        lockh, einfo->ei_cbdata);
2331         return set;
2332 }
2333
2334 static int osc_change_cbdata(struct obd_export *exp, struct lov_stripe_md *lsm,
2335                              ldlm_iterator_t replace, void *data)
2336 {
2337         struct ldlm_res_id res_id;
2338         struct obd_device *obd = class_exp2obd(exp);
2339
2340         ostid_build_res_name(&lsm->lsm_oi, &res_id);
2341         ldlm_resource_iterate(obd->obd_namespace, &res_id, replace, data);
2342         return 0;
2343 }
2344
2345 /* find any ldlm lock of the inode in osc
2346  * return 0    not find
2347  *        1    find one
2348  *      < 0    error */
2349 static int osc_find_cbdata(struct obd_export *exp, struct lov_stripe_md *lsm,
2350                            ldlm_iterator_t replace, void *data)
2351 {
2352         struct ldlm_res_id res_id;
2353         struct obd_device *obd = class_exp2obd(exp);
2354         int rc = 0;
2355
2356         ostid_build_res_name(&lsm->lsm_oi, &res_id);
2357         rc = ldlm_resource_iterate(obd->obd_namespace, &res_id, replace, data);
2358         if (rc == LDLM_ITER_STOP)
2359                 return(1);
2360         if (rc == LDLM_ITER_CONTINUE)
2361                 return(0);
2362         return(rc);
2363 }
2364
2365 static int osc_enqueue_fini(struct ptlrpc_request *req, struct ost_lvb *lvb,
2366                             obd_enqueue_update_f upcall, void *cookie,
2367                             __u64 *flags, int agl, int rc)
2368 {
2369         int intent = *flags & LDLM_FL_HAS_INTENT;
2370         ENTRY;
2371
2372         if (intent) {
2373                 /* The request was created before ldlm_cli_enqueue call. */
2374                 if (rc == ELDLM_LOCK_ABORTED) {
2375                         struct ldlm_reply *rep;
2376                         rep = req_capsule_server_get(&req->rq_pill,
2377                                                      &RMF_DLM_REP);
2378
2379                         LASSERT(rep != NULL);
2380                         rep->lock_policy_res1 =
2381                                 ptlrpc_status_ntoh(rep->lock_policy_res1);
2382                         if (rep->lock_policy_res1)
2383                                 rc = rep->lock_policy_res1;
2384                 }
2385         }
2386
2387         if ((intent != 0 && rc == ELDLM_LOCK_ABORTED && agl == 0) ||
2388             (rc == 0)) {
2389                 *flags |= LDLM_FL_LVB_READY;
2390                 CDEBUG(D_INODE,"got kms "LPU64" blocks "LPU64" mtime "LPU64"\n",
2391                        lvb->lvb_size, lvb->lvb_blocks, lvb->lvb_mtime);
2392         }
2393
2394         /* Call the update callback. */
2395         rc = (*upcall)(cookie, rc);
2396         RETURN(rc);
2397 }
2398
2399 static int osc_enqueue_interpret(const struct lu_env *env,
2400                                  struct ptlrpc_request *req,
2401                                  struct osc_enqueue_args *aa, int rc)
2402 {
2403         struct ldlm_lock *lock;
2404         struct lustre_handle handle;
2405         __u32 mode;
2406         struct ost_lvb *lvb;
2407         __u32 lvb_len;
2408         __u64 *flags = aa->oa_flags;
2409
2410         /* Make a local copy of a lock handle and a mode, because aa->oa_*
2411          * might be freed anytime after lock upcall has been called. */
2412         lustre_handle_copy(&handle, aa->oa_lockh);
2413         mode = aa->oa_ei->ei_mode;
2414
2415         /* ldlm_cli_enqueue is holding a reference on the lock, so it must
2416          * be valid. */
2417         lock = ldlm_handle2lock(&handle);
2418
2419         /* Take an additional reference so that a blocking AST that
2420          * ldlm_cli_enqueue_fini() might post for a failed lock, is guaranteed
2421          * to arrive after an upcall has been executed by
2422          * osc_enqueue_fini(). */
2423         ldlm_lock_addref(&handle, mode);
2424
2425         /* Let CP AST to grant the lock first. */
2426         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 1);
2427
2428         if (aa->oa_agl && rc == ELDLM_LOCK_ABORTED) {
2429                 lvb = NULL;
2430                 lvb_len = 0;
2431         } else {
2432                 lvb = aa->oa_lvb;
2433                 lvb_len = sizeof(*aa->oa_lvb);
2434         }
2435
2436         /* Complete obtaining the lock procedure. */
2437         rc = ldlm_cli_enqueue_fini(aa->oa_exp, req, aa->oa_ei->ei_type, 1,
2438                                    mode, flags, lvb, lvb_len, &handle, rc);
2439         /* Complete osc stuff. */
2440         rc = osc_enqueue_fini(req, aa->oa_lvb, aa->oa_upcall, aa->oa_cookie,
2441                               flags, aa->oa_agl, rc);
2442
2443         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_CANCEL_RACE, 10);
2444
2445         /* Release the lock for async request. */
2446         if (lustre_handle_is_used(&handle) && rc == ELDLM_OK)
2447                 /*
2448                  * Releases a reference taken by ldlm_cli_enqueue(), if it is
2449                  * not already released by
2450                  * ldlm_cli_enqueue_fini()->failed_lock_cleanup()
2451                  */
2452                 ldlm_lock_decref(&handle, mode);
2453
2454         LASSERTF(lock != NULL, "lockh %p, req %p, aa %p - client evicted?\n",
2455                  aa->oa_lockh, req, aa);
2456         ldlm_lock_decref(&handle, mode);
2457         LDLM_LOCK_PUT(lock);
2458         return rc;
2459 }
2460
2461 void osc_update_enqueue(struct lustre_handle *lov_lockhp,
2462                         struct lov_oinfo *loi, __u64 flags,
2463                         struct ost_lvb *lvb, __u32 mode, int rc)
2464 {
2465         struct ldlm_lock *lock = ldlm_handle2lock(lov_lockhp);
2466
2467         if (rc == ELDLM_OK) {
2468                 __u64 tmp;
2469
2470                 LASSERT(lock != NULL);
2471                 loi->loi_lvb = *lvb;
2472                 tmp = loi->loi_lvb.lvb_size;
2473                 /* Extend KMS up to the end of this lock and no further
2474                  * A lock on [x,y] means a KMS of up to y + 1 bytes! */
2475                 if (tmp > lock->l_policy_data.l_extent.end)
2476                         tmp = lock->l_policy_data.l_extent.end + 1;
2477                 if (tmp >= loi->loi_kms) {
2478                         LDLM_DEBUG(lock, "lock acquired, setting rss="LPU64
2479                                    ", kms="LPU64, loi->loi_lvb.lvb_size, tmp);
2480                         loi_kms_set(loi, tmp);
2481                 } else {
2482                         LDLM_DEBUG(lock, "lock acquired, setting rss="
2483                                    LPU64"; leaving kms="LPU64", end="LPU64,
2484                                    loi->loi_lvb.lvb_size, loi->loi_kms,
2485                                    lock->l_policy_data.l_extent.end);
2486                 }
2487                 ldlm_lock_allow_match(lock);
2488         } else if (rc == ELDLM_LOCK_ABORTED && (flags & LDLM_FL_HAS_INTENT)) {
2489                 LASSERT(lock != NULL);
2490                 loi->loi_lvb = *lvb;
2491                 ldlm_lock_allow_match(lock);
2492                 CDEBUG(D_INODE, "glimpsed, setting rss="LPU64"; leaving"
2493                        " kms="LPU64"\n", loi->loi_lvb.lvb_size, loi->loi_kms);
2494                 rc = ELDLM_OK;
2495         }
2496
2497         if (lock != NULL) {
2498                 if (rc != ELDLM_OK)
2499                         ldlm_lock_fail_match(lock);
2500
2501                 LDLM_LOCK_PUT(lock);
2502         }
2503 }
2504 EXPORT_SYMBOL(osc_update_enqueue);
2505
2506 struct ptlrpc_request_set *PTLRPCD_SET = (void *)1;
2507
2508 /* When enqueuing asynchronously, locks are not ordered, we can obtain a lock
2509  * from the 2nd OSC before a lock from the 1st one. This does not deadlock with
2510  * other synchronous requests, however keeping some locks and trying to obtain
2511  * others may take a considerable amount of time in a case of ost failure; and
2512  * when other sync requests do not get released lock from a client, the client
2513  * is excluded from the cluster -- such scenarious make the life difficult, so
2514  * release locks just after they are obtained. */
2515 int osc_enqueue_base(struct obd_export *exp, struct ldlm_res_id *res_id,
2516                      __u64 *flags, ldlm_policy_data_t *policy,
2517                      struct ost_lvb *lvb, int kms_valid,
2518                      obd_enqueue_update_f upcall, void *cookie,
2519                      struct ldlm_enqueue_info *einfo,
2520                      struct lustre_handle *lockh,
2521                      struct ptlrpc_request_set *rqset, int async, int agl)
2522 {
2523         struct obd_device *obd = exp->exp_obd;
2524         struct ptlrpc_request *req = NULL;
2525         int intent = *flags & LDLM_FL_HAS_INTENT;
2526         __u64 match_lvb = (agl != 0 ? 0 : LDLM_FL_LVB_READY);
2527         ldlm_mode_t mode;
2528         int rc;
2529         ENTRY;
2530
2531         /* Filesystem lock extents are extended to page boundaries so that
2532          * dealing with the page cache is a little smoother.  */
2533         policy->l_extent.start -= policy->l_extent.start & ~CFS_PAGE_MASK;
2534         policy->l_extent.end |= ~CFS_PAGE_MASK;
2535
2536         /*
2537          * kms is not valid when either object is completely fresh (so that no
2538          * locks are cached), or object was evicted. In the latter case cached
2539          * lock cannot be used, because it would prime inode state with
2540          * potentially stale LVB.
2541          */
2542         if (!kms_valid)
2543                 goto no_match;
2544
2545         /* Next, search for already existing extent locks that will cover us */
2546         /* If we're trying to read, we also search for an existing PW lock.  The
2547          * VFS and page cache already protect us locally, so lots of readers/
2548          * writers can share a single PW lock.
2549          *
2550          * There are problems with conversion deadlocks, so instead of
2551          * converting a read lock to a write lock, we'll just enqueue a new
2552          * one.
2553          *
2554          * At some point we should cancel the read lock instead of making them
2555          * send us a blocking callback, but there are problems with canceling
2556          * locks out from other users right now, too. */
2557         mode = einfo->ei_mode;
2558         if (einfo->ei_mode == LCK_PR)
2559                 mode |= LCK_PW;
2560         mode = ldlm_lock_match(obd->obd_namespace, *flags | match_lvb, res_id,
2561                                einfo->ei_type, policy, mode, lockh, 0);
2562         if (mode) {
2563                 struct ldlm_lock *matched = ldlm_handle2lock(lockh);
2564
2565                 if ((agl != 0) && !ldlm_is_lvb_ready(matched)) {
2566                         /* For AGL, if enqueue RPC is sent but the lock is not
2567                          * granted, then skip to process this strpe.
2568                          * Return -ECANCELED to tell the caller. */
2569                         ldlm_lock_decref(lockh, mode);
2570                         LDLM_LOCK_PUT(matched);
2571                         RETURN(-ECANCELED);
2572                 } else if (osc_set_lock_data_with_check(matched, einfo)) {
2573                         *flags |= LDLM_FL_LVB_READY;
2574                         /* addref the lock only if not async requests and PW
2575                          * lock is matched whereas we asked for PR. */
2576                         if (!rqset && einfo->ei_mode != mode)
2577                                 ldlm_lock_addref(lockh, LCK_PR);
2578                         if (intent) {
2579                                 /* I would like to be able to ASSERT here that
2580                                  * rss <= kms, but I can't, for reasons which
2581                                  * are explained in lov_enqueue() */
2582                         }
2583
2584                         /* We already have a lock, and it's referenced.
2585                          *
2586                          * At this point, the cl_lock::cll_state is CLS_QUEUING,
2587                          * AGL upcall may change it to CLS_HELD directly. */
2588                         (*upcall)(cookie, ELDLM_OK);
2589
2590                         if (einfo->ei_mode != mode)
2591                                 ldlm_lock_decref(lockh, LCK_PW);
2592                         else if (rqset)
2593                                 /* For async requests, decref the lock. */
2594                                 ldlm_lock_decref(lockh, einfo->ei_mode);
2595                         LDLM_LOCK_PUT(matched);
2596                         RETURN(ELDLM_OK);
2597                 } else {
2598                         ldlm_lock_decref(lockh, mode);
2599                         LDLM_LOCK_PUT(matched);
2600                 }
2601         }
2602
2603  no_match:
2604         if (intent) {
2605                 CFS_LIST_HEAD(cancels);
2606                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
2607                                            &RQF_LDLM_ENQUEUE_LVB);
2608                 if (req == NULL)
2609                         RETURN(-ENOMEM);
2610
2611                 rc = ldlm_prep_enqueue_req(exp, req, &cancels, 0);
2612                 if (rc) {
2613                         ptlrpc_request_free(req);
2614                         RETURN(rc);
2615                 }
2616
2617                 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
2618                                      sizeof *lvb);
2619                 ptlrpc_request_set_replen(req);
2620         }
2621
2622         /* users of osc_enqueue() can pass this flag for ldlm_lock_match() */
2623         *flags &= ~LDLM_FL_BLOCK_GRANTED;
2624
2625         rc = ldlm_cli_enqueue(exp, &req, einfo, res_id, policy, flags, lvb,
2626                               sizeof(*lvb), LVB_T_OST, lockh, async);
2627         if (rqset) {
2628                 if (!rc) {
2629                         struct osc_enqueue_args *aa;
2630                         CLASSERT (sizeof(*aa) <= sizeof(req->rq_async_args));
2631                         aa = ptlrpc_req_async_args(req);
2632                         aa->oa_ei = einfo;
2633                         aa->oa_exp = exp;
2634                         aa->oa_flags  = flags;
2635                         aa->oa_upcall = upcall;
2636                         aa->oa_cookie = cookie;
2637                         aa->oa_lvb    = lvb;
2638                         aa->oa_lockh  = lockh;
2639                         aa->oa_agl    = !!agl;
2640
2641                         req->rq_interpret_reply =
2642                                 (ptlrpc_interpterer_t)osc_enqueue_interpret;
2643                         if (rqset == PTLRPCD_SET)
2644                                 ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
2645                         else
2646                                 ptlrpc_set_add_req(rqset, req);
2647                 } else if (intent) {
2648                         ptlrpc_req_finished(req);
2649                 }
2650                 RETURN(rc);
2651         }
2652
2653         rc = osc_enqueue_fini(req, lvb, upcall, cookie, flags, agl, rc);
2654         if (intent)
2655                 ptlrpc_req_finished(req);
2656
2657         RETURN(rc);
2658 }
2659
2660 static int osc_enqueue(struct obd_export *exp, struct obd_info *oinfo,
2661                        struct ldlm_enqueue_info *einfo,
2662                        struct ptlrpc_request_set *rqset)
2663 {
2664         struct ldlm_res_id res_id;
2665         int rc;
2666         ENTRY;
2667
2668         ostid_build_res_name(&oinfo->oi_md->lsm_oi, &res_id);
2669         rc = osc_enqueue_base(exp, &res_id, &oinfo->oi_flags, &oinfo->oi_policy,
2670                               &oinfo->oi_md->lsm_oinfo[0]->loi_lvb,
2671                               oinfo->oi_md->lsm_oinfo[0]->loi_kms_valid,
2672                               oinfo->oi_cb_up, oinfo, einfo, oinfo->oi_lockh,
2673                               rqset, rqset != NULL, 0);
2674         RETURN(rc);
2675 }
2676
2677 int osc_match_base(struct obd_export *exp, struct ldlm_res_id *res_id,
2678                    __u32 type, ldlm_policy_data_t *policy, __u32 mode,
2679                    __u64 *flags, void *data, struct lustre_handle *lockh,
2680                    int unref)
2681 {
2682         struct obd_device *obd = exp->exp_obd;
2683         __u64 lflags = *flags;
2684         ldlm_mode_t rc;
2685         ENTRY;
2686
2687         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_MATCH))
2688                 RETURN(-EIO);
2689
2690         /* Filesystem lock extents are extended to page boundaries so that
2691          * dealing with the page cache is a little smoother */
2692         policy->l_extent.start -= policy->l_extent.start & ~CFS_PAGE_MASK;
2693         policy->l_extent.end |= ~CFS_PAGE_MASK;
2694
2695         /* Next, search for already existing extent locks that will cover us */
2696         /* If we're trying to read, we also search for an existing PW lock.  The
2697          * VFS and page cache already protect us locally, so lots of readers/
2698          * writers can share a single PW lock. */
2699         rc = mode;
2700         if (mode == LCK_PR)
2701                 rc |= LCK_PW;
2702         rc = ldlm_lock_match(obd->obd_namespace, lflags,
2703                              res_id, type, policy, rc, lockh, unref);
2704         if (rc) {
2705                 if (data != NULL) {
2706                         if (!osc_set_data_with_check(lockh, data)) {
2707                                 if (!(lflags & LDLM_FL_TEST_LOCK))
2708                                         ldlm_lock_decref(lockh, rc);
2709                                 RETURN(0);
2710                         }
2711                 }
2712                 if (!(lflags & LDLM_FL_TEST_LOCK) && mode != rc) {
2713                         ldlm_lock_addref(lockh, LCK_PR);
2714                         ldlm_lock_decref(lockh, LCK_PW);
2715                 }
2716                 RETURN(rc);
2717         }
2718         RETURN(rc);
2719 }
2720
2721 int osc_cancel_base(struct lustre_handle *lockh, __u32 mode)
2722 {
2723         ENTRY;
2724
2725         if (unlikely(mode == LCK_GROUP))
2726                 ldlm_lock_decref_and_cancel(lockh, mode);
2727         else
2728                 ldlm_lock_decref(lockh, mode);
2729
2730         RETURN(0);
2731 }
2732
2733 static int osc_cancel(struct obd_export *exp, struct lov_stripe_md *md,
2734                       __u32 mode, struct lustre_handle *lockh)
2735 {
2736         ENTRY;
2737         RETURN(osc_cancel_base(lockh, mode));
2738 }
2739
2740 static int osc_cancel_unused(struct obd_export *exp,
2741                              struct lov_stripe_md *lsm,
2742                              ldlm_cancel_flags_t flags,
2743                              void *opaque)
2744 {
2745         struct obd_device *obd = class_exp2obd(exp);
2746         struct ldlm_res_id res_id, *resp = NULL;
2747
2748         if (lsm != NULL) {
2749                 ostid_build_res_name(&lsm->lsm_oi, &res_id);
2750                 resp = &res_id;
2751         }
2752
2753         return ldlm_cli_cancel_unused(obd->obd_namespace, resp, flags, opaque);
2754 }
2755
2756 static int osc_statfs_interpret(const struct lu_env *env,
2757                                 struct ptlrpc_request *req,
2758                                 struct osc_async_args *aa, int rc)
2759 {
2760         struct obd_statfs *msfs;
2761         ENTRY;
2762
2763         if (rc == -EBADR)
2764                 /* The request has in fact never been sent
2765                  * due to issues at a higher level (LOV).
2766                  * Exit immediately since the caller is
2767                  * aware of the problem and takes care
2768                  * of the clean up */
2769                  RETURN(rc);
2770
2771         if ((rc == -ENOTCONN || rc == -EAGAIN) &&
2772             (aa->aa_oi->oi_flags & OBD_STATFS_NODELAY))
2773                 GOTO(out, rc = 0);
2774
2775         if (rc != 0)
2776                 GOTO(out, rc);
2777
2778         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
2779         if (msfs == NULL) {
2780                 GOTO(out, rc = -EPROTO);
2781         }
2782
2783         *aa->aa_oi->oi_osfs = *msfs;
2784 out:
2785         rc = aa->aa_oi->oi_cb_up(aa->aa_oi, rc);
2786         RETURN(rc);
2787 }
2788
2789 static int osc_statfs_async(struct obd_export *exp,
2790                             struct obd_info *oinfo, __u64 max_age,
2791                             struct ptlrpc_request_set *rqset)
2792 {
2793         struct obd_device     *obd = class_exp2obd(exp);
2794         struct ptlrpc_request *req;
2795         struct osc_async_args *aa;
2796         int                    rc;
2797         ENTRY;
2798
2799         /* We could possibly pass max_age in the request (as an absolute
2800          * timestamp or a "seconds.usec ago") so the target can avoid doing
2801          * extra calls into the filesystem if that isn't necessary (e.g.
2802          * during mount that would help a bit).  Having relative timestamps
2803          * is not so great if request processing is slow, while absolute
2804          * timestamps are not ideal because they need time synchronization. */
2805         req = ptlrpc_request_alloc(obd->u.cli.cl_import, &RQF_OST_STATFS);
2806         if (req == NULL)
2807                 RETURN(-ENOMEM);
2808
2809         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
2810         if (rc) {
2811                 ptlrpc_request_free(req);
2812                 RETURN(rc);
2813         }
2814         ptlrpc_request_set_replen(req);
2815         req->rq_request_portal = OST_CREATE_PORTAL;
2816         ptlrpc_at_set_req_timeout(req);
2817
2818         if (oinfo->oi_flags & OBD_STATFS_NODELAY) {
2819                 /* procfs requests not want stat in wait for avoid deadlock */
2820                 req->rq_no_resend = 1;
2821                 req->rq_no_delay = 1;
2822         }
2823
2824         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_statfs_interpret;
2825         CLASSERT (sizeof(*aa) <= sizeof(req->rq_async_args));
2826         aa = ptlrpc_req_async_args(req);
2827         aa->aa_oi = oinfo;
2828
2829         ptlrpc_set_add_req(rqset, req);
2830         RETURN(0);
2831 }
2832
2833 static int osc_statfs(const struct lu_env *env, struct obd_export *exp,
2834                       struct obd_statfs *osfs, __u64 max_age, __u32 flags)
2835 {
2836         struct obd_device     *obd = class_exp2obd(exp);
2837         struct obd_statfs     *msfs;
2838         struct ptlrpc_request *req;
2839         struct obd_import     *imp = NULL;
2840         int rc;
2841         ENTRY;
2842
2843         /*Since the request might also come from lprocfs, so we need
2844          *sync this with client_disconnect_export Bug15684*/
2845         down_read(&obd->u.cli.cl_sem);
2846         if (obd->u.cli.cl_import)
2847                 imp = class_import_get(obd->u.cli.cl_import);
2848         up_read(&obd->u.cli.cl_sem);
2849         if (!imp)
2850                 RETURN(-ENODEV);
2851
2852         /* We could possibly pass max_age in the request (as an absolute
2853          * timestamp or a "seconds.usec ago") so the target can avoid doing
2854          * extra calls into the filesystem if that isn't necessary (e.g.
2855          * during mount that would help a bit).  Having relative timestamps
2856          * is not so great if request processing is slow, while absolute
2857          * timestamps are not ideal because they need time synchronization. */
2858         req = ptlrpc_request_alloc(imp, &RQF_OST_STATFS);
2859
2860         class_import_put(imp);
2861
2862         if (req == NULL)
2863                 RETURN(-ENOMEM);
2864
2865         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
2866         if (rc) {
2867                 ptlrpc_request_free(req);
2868                 RETURN(rc);
2869         }
2870         ptlrpc_request_set_replen(req);
2871         req->rq_request_portal = OST_CREATE_PORTAL;
2872         ptlrpc_at_set_req_timeout(req);
2873
2874         if (flags & OBD_STATFS_NODELAY) {
2875                 /* procfs requests not want stat in wait for avoid deadlock */
2876                 req->rq_no_resend = 1;
2877                 req->rq_no_delay = 1;
2878         }
2879
2880         rc = ptlrpc_queue_wait(req);
2881         if (rc)
2882                 GOTO(out, rc);
2883
2884         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
2885         if (msfs == NULL) {
2886                 GOTO(out, rc = -EPROTO);
2887         }
2888
2889         *osfs = *msfs;
2890
2891         EXIT;
2892  out:
2893         ptlrpc_req_finished(req);
2894         return rc;
2895 }
2896
2897 /* Retrieve object striping information.
2898  *
2899  * @lmmu is a pointer to an in-core struct with lmm_ost_count indicating
2900  * the maximum number of OST indices which will fit in the user buffer.
2901  * lmm_magic must be LOV_MAGIC (we only use 1 slot here).
2902  */
2903 static int osc_getstripe(struct lov_stripe_md *lsm, struct lov_user_md *lump)
2904 {
2905         /* we use lov_user_md_v3 because it is larger than lov_user_md_v1 */
2906         struct lov_user_md_v3 lum, *lumk;
2907         struct lov_user_ost_data_v1 *lmm_objects;
2908         int rc = 0, lum_size;
2909         ENTRY;
2910
2911         if (!lsm)
2912                 RETURN(-ENODATA);
2913
2914         /* we only need the header part from user space to get lmm_magic and
2915          * lmm_stripe_count, (the header part is common to v1 and v3) */
2916         lum_size = sizeof(struct lov_user_md_v1);
2917         if (copy_from_user(&lum, lump, lum_size))
2918                 RETURN(-EFAULT);
2919
2920         if ((lum.lmm_magic != LOV_USER_MAGIC_V1) &&
2921             (lum.lmm_magic != LOV_USER_MAGIC_V3))
2922                 RETURN(-EINVAL);
2923
2924         /* lov_user_md_vX and lov_mds_md_vX must have the same size */
2925         LASSERT(sizeof(struct lov_user_md_v1) == sizeof(struct lov_mds_md_v1));
2926         LASSERT(sizeof(struct lov_user_md_v3) == sizeof(struct lov_mds_md_v3));
2927         LASSERT(sizeof(lum.lmm_objects[0]) == sizeof(lumk->lmm_objects[0]));
2928
2929         /* we can use lov_mds_md_size() to compute lum_size
2930          * because lov_user_md_vX and lov_mds_md_vX have the same size */
2931         if (lum.lmm_stripe_count > 0) {
2932                 lum_size = lov_mds_md_size(lum.lmm_stripe_count, lum.lmm_magic);
2933                 OBD_ALLOC(lumk, lum_size);
2934                 if (!lumk)
2935                         RETURN(-ENOMEM);
2936
2937                 if (lum.lmm_magic == LOV_USER_MAGIC_V1)
2938                         lmm_objects =
2939                             &(((struct lov_user_md_v1 *)lumk)->lmm_objects[0]);
2940                 else
2941                         lmm_objects = &(lumk->lmm_objects[0]);
2942                 lmm_objects->l_ost_oi = lsm->lsm_oi;
2943         } else {
2944                 lum_size = lov_mds_md_size(0, lum.lmm_magic);
2945                 lumk = &lum;
2946         }
2947
2948         lumk->lmm_oi = lsm->lsm_oi;
2949         lumk->lmm_stripe_count = 1;
2950
2951         if (copy_to_user(lump, lumk, lum_size))
2952                 rc = -EFAULT;
2953
2954         if (lumk != &lum)
2955                 OBD_FREE(lumk, lum_size);
2956
2957         RETURN(rc);
2958 }
2959
2960
2961 static int osc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
2962                          void *karg, void *uarg)
2963 {
2964         struct obd_device *obd = exp->exp_obd;
2965         struct obd_ioctl_data *data = karg;
2966         int err = 0;
2967         ENTRY;
2968
2969         if (!try_module_get(THIS_MODULE)) {
2970                 CERROR("Can't get module. Is it alive?");
2971                 return -EINVAL;
2972         }
2973         switch (cmd) {
2974         case OBD_IOC_LOV_GET_CONFIG: {
2975                 char *buf;
2976                 struct lov_desc *desc;
2977                 struct obd_uuid uuid;
2978
2979                 buf = NULL;
2980                 len = 0;
2981                 if (obd_ioctl_getdata(&buf, &len, (void *)uarg))
2982                         GOTO(out, err = -EINVAL);
2983
2984                 data = (struct obd_ioctl_data *)buf;
2985
2986                 if (sizeof(*desc) > data->ioc_inllen1) {
2987                         obd_ioctl_freedata(buf, len);
2988                         GOTO(out, err = -EINVAL);
2989                 }
2990
2991                 if (data->ioc_inllen2 < sizeof(uuid)) {
2992                         obd_ioctl_freedata(buf, len);
2993                         GOTO(out, err = -EINVAL);
2994                 }
2995
2996                 desc = (struct lov_desc *)data->ioc_inlbuf1;
2997                 desc->ld_tgt_count = 1;
2998                 desc->ld_active_tgt_count = 1;
2999                 desc->ld_default_stripe_count = 1;
3000                 desc->ld_default_stripe_size = 0;
3001                 desc->ld_default_stripe_offset = 0;
3002                 desc->ld_pattern = 0;
3003                 memcpy(&desc->ld_uuid, &obd->obd_uuid, sizeof(uuid));
3004
3005                 memcpy(data->ioc_inlbuf2, &obd->obd_uuid, sizeof(uuid));
3006
3007                 err = copy_to_user((void *)uarg, buf, len);
3008                 if (err)
3009                         err = -EFAULT;
3010                 obd_ioctl_freedata(buf, len);
3011                 GOTO(out, err);
3012         }
3013         case LL_IOC_LOV_SETSTRIPE:
3014                 err = obd_alloc_memmd(exp, karg);
3015                 if (err > 0)
3016                         err = 0;
3017                 GOTO(out, err);
3018         case LL_IOC_LOV_GETSTRIPE:
3019                 err = osc_getstripe(karg, uarg);
3020                 GOTO(out, err);
3021         case OBD_IOC_CLIENT_RECOVER:
3022                 err = ptlrpc_recover_import(obd->u.cli.cl_import,
3023                                             data->ioc_inlbuf1, 0);
3024                 if (err > 0)
3025                         err = 0;
3026                 GOTO(out, err);
3027         case IOC_OSC_SET_ACTIVE:
3028                 err = ptlrpc_set_import_active(obd->u.cli.cl_import,
3029                                                data->ioc_offset);
3030                 GOTO(out, err);
3031         case OBD_IOC_POLL_QUOTACHECK:
3032                 err = osc_quota_poll_check(exp, (struct if_quotacheck *)karg);
3033                 GOTO(out, err);
3034         case OBD_IOC_PING_TARGET:
3035                 err = ptlrpc_obd_ping(obd);
3036                 GOTO(out, err);
3037         default:
3038                 CDEBUG(D_INODE, "unrecognised ioctl %#x by %s\n",
3039                        cmd, current_comm());
3040                 GOTO(out, err = -ENOTTY);
3041         }
3042 out:
3043         module_put(THIS_MODULE);
3044         return err;
3045 }
3046
3047 static int osc_get_info(const struct lu_env *env, struct obd_export *exp,
3048                         obd_count keylen, void *key, __u32 *vallen, void *val,
3049                         struct lov_stripe_md *lsm)
3050 {
3051         ENTRY;
3052         if (!vallen || !val)
3053                 RETURN(-EFAULT);
3054
3055         if (KEY_IS(KEY_LOCK_TO_STRIPE)) {
3056                 __u32 *stripe = val;
3057                 *vallen = sizeof(*stripe);
3058                 *stripe = 0;
3059                 RETURN(0);
3060         } else if (KEY_IS(KEY_LAST_ID)) {
3061                 struct ptlrpc_request *req;
3062                 obd_id                *reply;
3063                 char                  *tmp;
3064                 int                    rc;
3065
3066                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
3067                                            &RQF_OST_GET_INFO_LAST_ID);
3068                 if (req == NULL)
3069                         RETURN(-ENOMEM);
3070
3071                 req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
3072                                      RCL_CLIENT, keylen);
3073                 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
3074                 if (rc) {
3075                         ptlrpc_request_free(req);
3076                         RETURN(rc);
3077                 }
3078
3079                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
3080                 memcpy(tmp, key, keylen);
3081
3082                 req->rq_no_delay = req->rq_no_resend = 1;
3083                 ptlrpc_request_set_replen(req);
3084                 rc = ptlrpc_queue_wait(req);
3085                 if (rc)
3086                         GOTO(out, rc);
3087
3088                 reply = req_capsule_server_get(&req->rq_pill, &RMF_OBD_ID);
3089                 if (reply == NULL)
3090                         GOTO(out, rc = -EPROTO);
3091
3092                 *((obd_id *)val) = *reply;
3093         out:
3094                 ptlrpc_req_finished(req);
3095                 RETURN(rc);
3096         } else if (KEY_IS(KEY_FIEMAP)) {
3097                 struct ll_fiemap_info_key *fm_key =
3098                                 (struct ll_fiemap_info_key *)key;
3099                 struct ldlm_res_id       res_id;
3100                 ldlm_policy_data_t       policy;
3101                 struct lustre_handle     lockh;
3102                 ldlm_mode_t              mode = 0;
3103                 struct ptlrpc_request   *req;
3104                 struct ll_user_fiemap   *reply;
3105                 char                    *tmp;
3106                 int                      rc;
3107
3108                 if (!(fm_key->fiemap.fm_flags & FIEMAP_FLAG_SYNC))
3109                         goto skip_locking;
3110
3111                 policy.l_extent.start = fm_key->fiemap.fm_start &
3112                                                 CFS_PAGE_MASK;
3113
3114                 if (OBD_OBJECT_EOF - fm_key->fiemap.fm_length <=
3115                     fm_key->fiemap.fm_start + PAGE_CACHE_SIZE - 1)
3116                         policy.l_extent.end = OBD_OBJECT_EOF;
3117                 else
3118                         policy.l_extent.end = (fm_key->fiemap.fm_start +
3119                                 fm_key->fiemap.fm_length +
3120                                 PAGE_CACHE_SIZE - 1) & CFS_PAGE_MASK;
3121
3122                 ostid_build_res_name(&fm_key->oa.o_oi, &res_id);
3123                 mode = ldlm_lock_match(exp->exp_obd->obd_namespace,
3124                                        LDLM_FL_BLOCK_GRANTED |
3125                                        LDLM_FL_LVB_READY,
3126                                        &res_id, LDLM_EXTENT, &policy,
3127                                        LCK_PR | LCK_PW, &lockh, 0);
3128                 if (mode) { /* lock is cached on client */
3129                         if (mode != LCK_PR) {
3130                                 ldlm_lock_addref(&lockh, LCK_PR);
3131                                 ldlm_lock_decref(&lockh, LCK_PW);
3132                         }
3133                 } else { /* no cached lock, needs acquire lock on server side */
3134                         fm_key->oa.o_valid |= OBD_MD_FLFLAGS;
3135                         fm_key->oa.o_flags |= OBD_FL_SRVLOCK;
3136                 }
3137
3138 skip_locking:
3139                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
3140                                            &RQF_OST_GET_INFO_FIEMAP);
3141                 if (req == NULL)
3142                         GOTO(drop_lock, rc = -ENOMEM);
3143
3144                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_KEY,
3145                                      RCL_CLIENT, keylen);
3146                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_VAL,
3147                                      RCL_CLIENT, *vallen);
3148                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_VAL,
3149                                      RCL_SERVER, *vallen);
3150
3151                 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
3152                 if (rc) {
3153                         ptlrpc_request_free(req);
3154                         GOTO(drop_lock, rc);
3155                 }
3156
3157                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_FIEMAP_KEY);
3158                 memcpy(tmp, key, keylen);
3159                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_FIEMAP_VAL);
3160                 memcpy(tmp, val, *vallen);
3161
3162                 ptlrpc_request_set_replen(req);
3163                 rc = ptlrpc_queue_wait(req);
3164                 if (rc)
3165                         GOTO(fini_req, rc);
3166
3167                 reply = req_capsule_server_get(&req->rq_pill, &RMF_FIEMAP_VAL);
3168                 if (reply == NULL)
3169                         GOTO(fini_req, rc = -EPROTO);
3170
3171                 memcpy(val, reply, *vallen);
3172 fini_req:
3173                 ptlrpc_req_finished(req);
3174 drop_lock:
3175                 if (mode)
3176                         ldlm_lock_decref(&lockh, LCK_PR);
3177                 RETURN(rc);
3178         }
3179
3180         RETURN(-EINVAL);
3181 }
3182
3183 static int osc_set_info_async(const struct lu_env *env, struct obd_export *exp,
3184                               obd_count keylen, void *key, obd_count vallen,
3185                               void *val, struct ptlrpc_request_set *set)
3186 {
3187         struct ptlrpc_request *req;
3188         struct obd_device     *obd = exp->exp_obd;
3189         struct obd_import     *imp = class_exp2cliimp(exp);
3190         char                  *tmp;
3191         int                    rc;
3192         ENTRY;
3193
3194         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_SHUTDOWN, 10);
3195
3196         if (KEY_IS(KEY_CHECKSUM)) {
3197                 if (vallen != sizeof(int))
3198                         RETURN(-EINVAL);
3199                 exp->exp_obd->u.cli.cl_checksum = (*(int *)val) ? 1 : 0;
3200                 RETURN(0);
3201         }
3202
3203         if (KEY_IS(KEY_SPTLRPC_CONF)) {
3204                 sptlrpc_conf_client_adapt(obd);
3205                 RETURN(0);
3206         }
3207
3208         if (KEY_IS(KEY_FLUSH_CTX)) {
3209                 sptlrpc_import_flush_my_ctx(imp);
3210                 RETURN(0);
3211         }
3212
3213         if (KEY_IS(KEY_CACHE_SET)) {
3214                 struct client_obd *cli = &obd->u.cli;
3215
3216                 LASSERT(cli->cl_cache == NULL); /* only once */
3217                 cli->cl_cache = (struct cl_client_cache *)val;
3218                 cfs_atomic_inc(&cli->cl_cache->ccc_users);
3219                 cli->cl_lru_left = &cli->cl_cache->ccc_lru_left;
3220
3221                 /* add this osc into entity list */
3222                 LASSERT(cfs_list_empty(&cli->cl_lru_osc));
3223                 spin_lock(&cli->cl_cache->ccc_lru_lock);
3224                 cfs_list_add(&cli->cl_lru_osc, &cli->cl_cache->ccc_lru);
3225                 spin_unlock(&cli->cl_cache->ccc_lru_lock);
3226
3227                 RETURN(0);
3228         }
3229
3230         if (KEY_IS(KEY_CACHE_LRU_SHRINK)) {
3231                 struct client_obd *cli = &obd->u.cli;
3232                 int nr = cfs_atomic_read(&cli->cl_lru_in_list) >> 1;
3233                 int target = *(int *)val;
3234
3235                 nr = osc_lru_shrink(cli, min(nr, target));
3236                 *(int *)val -= nr;
3237                 RETURN(0);
3238         }
3239
3240         if (!set && !KEY_IS(KEY_GRANT_SHRINK))
3241                 RETURN(-EINVAL);
3242
3243         /* We pass all other commands directly to OST. Since nobody calls osc
3244            methods directly and everybody is supposed to go through LOV, we
3245            assume lov checked invalid values for us.
3246            The only recognised values so far are evict_by_nid and mds_conn.
3247            Even if something bad goes through, we'd get a -EINVAL from OST
3248            anyway. */
3249
3250         req = ptlrpc_request_alloc(imp, KEY_IS(KEY_GRANT_SHRINK) ?
3251                                                 &RQF_OST_SET_GRANT_INFO :
3252                                                 &RQF_OBD_SET_INFO);
3253         if (req == NULL)
3254                 RETURN(-ENOMEM);
3255
3256         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
3257                              RCL_CLIENT, keylen);
3258         if (!KEY_IS(KEY_GRANT_SHRINK))
3259                 req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_VAL,
3260                                      RCL_CLIENT, vallen);
3261         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SET_INFO);
3262         if (rc) {
3263                 ptlrpc_request_free(req);
3264                 RETURN(rc);
3265         }
3266
3267         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
3268         memcpy(tmp, key, keylen);
3269         tmp = req_capsule_client_get(&req->rq_pill, KEY_IS(KEY_GRANT_SHRINK) ?
3270                                                         &RMF_OST_BODY :
3271                                                         &RMF_SETINFO_VAL);
3272         memcpy(tmp, val, vallen);
3273
3274         if (KEY_IS(KEY_GRANT_SHRINK)) {
3275                 struct osc_grant_args *aa;
3276                 struct obdo *oa;
3277
3278                 CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
3279                 aa = ptlrpc_req_async_args(req);
3280                 OBDO_ALLOC(oa);
3281                 if (!oa) {
3282                         ptlrpc_req_finished(req);
3283                         RETURN(-ENOMEM);
3284                 }
3285                 *oa = ((struct ost_body *)val)->oa;
3286                 aa->aa_oa = oa;
3287                 req->rq_interpret_reply = osc_shrink_grant_interpret;
3288         }
3289
3290         ptlrpc_request_set_replen(req);
3291         if (!KEY_IS(KEY_GRANT_SHRINK)) {
3292                 LASSERT(set != NULL);
3293                 ptlrpc_set_add_req(set, req);
3294                 ptlrpc_check_set(NULL, set);
3295         } else
3296                 ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
3297
3298         RETURN(0);
3299 }
3300
3301
3302 static int osc_llog_init(struct obd_device *obd, struct obd_llog_group *olg,
3303                          struct obd_device *disk_obd, int *index)
3304 {
3305         /* this code is not supposed to be used with LOD/OSP
3306          * to be removed soon */
3307         LBUG();
3308         return 0;
3309 }
3310
3311 static int osc_llog_finish(struct obd_device *obd, int count)
3312 {
3313         struct llog_ctxt *ctxt;
3314
3315         ENTRY;
3316
3317         ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
3318         if (ctxt) {
3319                 llog_cat_close(NULL, ctxt->loc_handle);
3320                 llog_cleanup(NULL, ctxt);
3321         }
3322
3323         ctxt = llog_get_context(obd, LLOG_SIZE_REPL_CTXT);
3324         if (ctxt)
3325                 llog_cleanup(NULL, ctxt);
3326         RETURN(0);
3327 }
3328
3329 static int osc_reconnect(const struct lu_env *env,
3330                          struct obd_export *exp, struct obd_device *obd,
3331                          struct obd_uuid *cluuid,
3332                          struct obd_connect_data *data,
3333                          void *localdata)
3334 {
3335         struct client_obd *cli = &obd->u.cli;
3336
3337         if (data != NULL && (data->ocd_connect_flags & OBD_CONNECT_GRANT)) {
3338                 long lost_grant;
3339
3340                 client_obd_list_lock(&cli->cl_loi_list_lock);
3341                 data->ocd_grant = (cli->cl_avail_grant + cli->cl_dirty) ?:
3342                                 2 * cli_brw_size(obd);
3343                 lost_grant = cli->cl_lost_grant;
3344                 cli->cl_lost_grant = 0;
3345                 client_obd_list_unlock(&cli->cl_loi_list_lock);
3346
3347                 CDEBUG(D_RPCTRACE, "ocd_connect_flags: "LPX64" ocd_version: %d"
3348                        " ocd_grant: %d, lost: %ld.\n", data->ocd_connect_flags,
3349                        data->ocd_version, data->ocd_grant, lost_grant);
3350         }
3351
3352         RETURN(0);
3353 }
3354
3355 static int osc_disconnect(struct obd_export *exp)
3356 {
3357         struct obd_device *obd = class_exp2obd(exp);
3358         struct llog_ctxt  *ctxt;
3359         int rc;
3360
3361         ctxt = llog_get_context(obd, LLOG_SIZE_REPL_CTXT);
3362         if (ctxt) {
3363                 if (obd->u.cli.cl_conn_count == 1) {
3364                         /* Flush any remaining cancel messages out to the
3365                          * target */
3366                         llog_sync(ctxt, exp, 0);
3367                 }
3368                 llog_ctxt_put(ctxt);
3369         } else {
3370                 CDEBUG(D_HA, "No LLOG_SIZE_REPL_CTXT found in obd %p\n",
3371                        obd);
3372         }
3373
3374         rc = client_disconnect_export(exp);
3375         /**
3376          * Initially we put del_shrink_grant before disconnect_export, but it
3377          * causes the following problem if setup (connect) and cleanup
3378          * (disconnect) are tangled together.
3379          *      connect p1                     disconnect p2
3380          *   ptlrpc_connect_import
3381          *     ...............               class_manual_cleanup
3382          *                                     osc_disconnect
3383          *                                     del_shrink_grant
3384          *   ptlrpc_connect_interrupt
3385          *     init_grant_shrink
3386          *   add this client to shrink list
3387          *                                      cleanup_osc
3388          * Bang! pinger trigger the shrink.
3389          * So the osc should be disconnected from the shrink list, after we
3390          * are sure the import has been destroyed. BUG18662
3391          */
3392         if (obd->u.cli.cl_import == NULL)
3393                 osc_del_shrink_grant(&obd->u.cli);
3394         return rc;
3395 }
3396
3397 static int osc_import_event(struct obd_device *obd,
3398                             struct obd_import *imp,
3399                             enum obd_import_event event)
3400 {
3401         struct client_obd *cli;
3402         int rc = 0;
3403
3404         ENTRY;
3405         LASSERT(imp->imp_obd == obd);
3406
3407         switch (event) {
3408         case IMP_EVENT_DISCON: {
3409                 cli = &obd->u.cli;
3410                 client_obd_list_lock(&cli->cl_loi_list_lock);
3411                 cli->cl_avail_grant = 0;
3412                 cli->cl_lost_grant = 0;
3413                 client_obd_list_unlock(&cli->cl_loi_list_lock);
3414                 break;
3415         }
3416         case IMP_EVENT_INACTIVE: {
3417                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_INACTIVE, NULL);
3418                 break;
3419         }
3420         case IMP_EVENT_INVALIDATE: {
3421                 struct ldlm_namespace *ns = obd->obd_namespace;
3422                 struct lu_env         *env;
3423                 int                    refcheck;
3424
3425                 env = cl_env_get(&refcheck);
3426                 if (!IS_ERR(env)) {
3427                         /* Reset grants */
3428                         cli = &obd->u.cli;
3429                         /* all pages go to failing rpcs due to the invalid
3430                          * import */
3431                         osc_io_unplug(env, cli, NULL, PDL_POLICY_ROUND);
3432
3433                         ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
3434                         cl_env_put(env, &refcheck);
3435                 } else
3436                         rc = PTR_ERR(env);
3437                 break;
3438         }
3439         case IMP_EVENT_ACTIVE: {
3440                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVE, NULL);
3441                 break;
3442         }
3443         case IMP_EVENT_OCD: {
3444                 struct obd_connect_data *ocd = &imp->imp_connect_data;
3445
3446                 if (ocd->ocd_connect_flags & OBD_CONNECT_GRANT)
3447                         osc_init_grant(&obd->u.cli, ocd);
3448
3449                 /* See bug 7198 */
3450                 if (ocd->ocd_connect_flags & OBD_CONNECT_REQPORTAL)
3451                         imp->imp_client->cli_request_portal =OST_REQUEST_PORTAL;
3452
3453                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_OCD, NULL);
3454                 break;
3455         }
3456         case IMP_EVENT_DEACTIVATE: {
3457                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_DEACTIVATE, NULL);
3458                 break;
3459         }
3460         case IMP_EVENT_ACTIVATE: {
3461                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVATE, NULL);
3462                 break;
3463         }
3464         default:
3465                 CERROR("Unknown import event %d\n", event);
3466                 LBUG();
3467         }
3468         RETURN(rc);
3469 }
3470
3471 /**
3472  * Determine whether the lock can be canceled before replaying the lock
3473  * during recovery, see bug16774 for detailed information.
3474  *
3475  * \retval zero the lock can't be canceled
3476  * \retval other ok to cancel
3477  */
3478 static int osc_cancel_for_recovery(struct ldlm_lock *lock)
3479 {
3480         check_res_locked(lock->l_resource);
3481
3482         /*
3483          * Cancel all unused extent lock in granted mode LCK_PR or LCK_CR.
3484          *
3485          * XXX as a future improvement, we can also cancel unused write lock
3486          * if it doesn't have dirty data and active mmaps.
3487          */
3488         if (lock->l_resource->lr_type == LDLM_EXTENT &&
3489             (lock->l_granted_mode == LCK_PR ||
3490              lock->l_granted_mode == LCK_CR) &&
3491             (osc_dlm_lock_pageref(lock) == 0))
3492                 RETURN(1);
3493
3494         RETURN(0);
3495 }
3496
3497 static int brw_queue_work(const struct lu_env *env, void *data)
3498 {
3499         struct client_obd *cli = data;
3500
3501         CDEBUG(D_CACHE, "Run writeback work for client obd %p.\n", cli);
3502
3503         osc_io_unplug(env, cli, NULL, PDL_POLICY_SAME);
3504         RETURN(0);
3505 }
3506
3507 int osc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
3508 {
3509         struct lprocfs_static_vars lvars = { 0 };
3510         struct client_obd          *cli = &obd->u.cli;
3511         void                       *handler;
3512         int                        rc;
3513         ENTRY;
3514
3515         rc = ptlrpcd_addref();
3516         if (rc)
3517                 RETURN(rc);
3518
3519         rc = client_obd_setup(obd, lcfg);
3520         if (rc)
3521                 GOTO(out_ptlrpcd, rc);
3522
3523         handler = ptlrpcd_alloc_work(cli->cl_import, brw_queue_work, cli);
3524         if (IS_ERR(handler))
3525                 GOTO(out_client_setup, rc = PTR_ERR(handler));
3526         cli->cl_writeback_work = handler;
3527
3528         rc = osc_quota_setup(obd);
3529         if (rc)
3530                 GOTO(out_ptlrpcd_work, rc);
3531
3532         cli->cl_grant_shrink_interval = GRANT_SHRINK_INTERVAL;
3533         lprocfs_osc_init_vars(&lvars);
3534         if (lprocfs_obd_setup(obd, lvars.obd_vars) == 0) {
3535                 lproc_osc_attach_seqstat(obd);
3536                 sptlrpc_lprocfs_cliobd_attach(obd);
3537                 ptlrpc_lprocfs_register_obd(obd);
3538         }
3539
3540         /* We need to allocate a few requests more, because
3541          * brw_interpret tries to create new requests before freeing
3542          * previous ones, Ideally we want to have 2x max_rpcs_in_flight
3543          * reserved, but I'm afraid that might be too much wasted RAM
3544          * in fact, so 2 is just my guess and still should work. */
3545         cli->cl_import->imp_rq_pool =
3546                 ptlrpc_init_rq_pool(cli->cl_max_rpcs_in_flight + 2,
3547                                     OST_MAXREQSIZE,
3548                                     ptlrpc_add_rqs_to_pool);
3549
3550         CFS_INIT_LIST_HEAD(&cli->cl_grant_shrink_list);
3551         ns_register_cancel(obd->obd_namespace, osc_cancel_for_recovery);
3552         RETURN(rc);
3553
3554 out_ptlrpcd_work:
3555         ptlrpcd_destroy_work(handler);
3556 out_client_setup:
3557         client_obd_cleanup(obd);
3558 out_ptlrpcd:
3559         ptlrpcd_decref();
3560         RETURN(rc);
3561 }
3562
3563 static int osc_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
3564 {
3565         int rc = 0;
3566         ENTRY;
3567
3568         switch (stage) {
3569         case OBD_CLEANUP_EARLY: {
3570                 struct obd_import *imp;
3571                 imp = obd->u.cli.cl_import;
3572                 CDEBUG(D_HA, "Deactivating import %s\n", obd->obd_name);
3573                 /* ptlrpc_abort_inflight to stop an mds_lov_synchronize */
3574                 ptlrpc_deactivate_import(imp);
3575                 spin_lock(&imp->imp_lock);
3576                 imp->imp_pingable = 0;
3577                 spin_unlock(&imp->imp_lock);
3578                 break;
3579         }
3580         case OBD_CLEANUP_EXPORTS: {
3581                 struct client_obd *cli = &obd->u.cli;
3582                 /* LU-464
3583                  * for echo client, export may be on zombie list, wait for
3584                  * zombie thread to cull it, because cli.cl_import will be
3585                  * cleared in client_disconnect_export():
3586                  *   class_export_destroy() -> obd_cleanup() ->
3587                  *   echo_device_free() -> echo_client_cleanup() ->
3588                  *   obd_disconnect() -> osc_disconnect() ->
3589                  *   client_disconnect_export()
3590                  */
3591                 obd_zombie_barrier();
3592                 if (cli->cl_writeback_work) {
3593                         ptlrpcd_destroy_work(cli->cl_writeback_work);
3594                         cli->cl_writeback_work = NULL;
3595                 }
3596                 obd_cleanup_client_import(obd);
3597                 ptlrpc_lprocfs_unregister_obd(obd);
3598                 lprocfs_obd_cleanup(obd);
3599                 rc = obd_llog_finish(obd, 0);
3600                 if (rc != 0)
3601                         CERROR("failed to cleanup llogging subsystems\n");
3602                 break;
3603                 }
3604         }
3605         RETURN(rc);
3606 }
3607
3608 int osc_cleanup(struct obd_device *obd)
3609 {
3610         struct client_obd *cli = &obd->u.cli;
3611         int rc;
3612
3613         ENTRY;
3614
3615         /* lru cleanup */
3616         if (cli->cl_cache != NULL) {
3617                 LASSERT(cfs_atomic_read(&cli->cl_cache->ccc_users) > 0);
3618                 spin_lock(&cli->cl_cache->ccc_lru_lock);
3619                 cfs_list_del_init(&cli->cl_lru_osc);
3620                 spin_unlock(&cli->cl_cache->ccc_lru_lock);
3621                 cli->cl_lru_left = NULL;
3622                 cfs_atomic_dec(&cli->cl_cache->ccc_users);
3623                 cli->cl_cache = NULL;
3624         }
3625
3626         /* free memory of osc quota cache */
3627         osc_quota_cleanup(obd);
3628
3629         rc = client_obd_cleanup(obd);
3630
3631         ptlrpcd_decref();
3632         RETURN(rc);
3633 }
3634
3635 int osc_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg)
3636 {
3637         struct lprocfs_static_vars lvars = { 0 };
3638         int rc = 0;
3639
3640         lprocfs_osc_init_vars(&lvars);
3641
3642         switch (lcfg->lcfg_command) {
3643         default:
3644                 rc = class_process_proc_param(PARAM_OSC, lvars.obd_vars,
3645                                               lcfg, obd);
3646                 if (rc > 0)
3647                         rc = 0;
3648                 break;
3649         }
3650
3651         return(rc);
3652 }
3653
3654 static int osc_process_config(struct obd_device *obd, obd_count len, void *buf)
3655 {
3656         return osc_process_config_base(obd, buf);
3657 }
3658
3659 struct obd_ops osc_obd_ops = {
3660         .o_owner                = THIS_MODULE,
3661         .o_setup                = osc_setup,
3662         .o_precleanup           = osc_precleanup,
3663         .o_cleanup              = osc_cleanup,
3664         .o_add_conn             = client_import_add_conn,
3665         .o_del_conn             = client_import_del_conn,
3666         .o_connect              = client_connect_import,