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[fs/lustre-release.git] / lustre / osc / osc_request.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 only,
8  * as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * General Public License version 2 for more details (a copy is included
14  * in the LICENSE file that accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License
17  * version 2 along with this program; If not, see
18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19  *
20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21  * CA 95054 USA or visit www.sun.com if you need additional information or
22  * have any questions.
23  *
24  * GPL HEADER END
25  */
26 /*
27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
28  * Use is subject to license terms.
29  *
30  * Copyright (c) 2011, 2012, 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(&body->oa, oinfo->oi_oa);
188         osc_pack_capa(req, body, oinfo->oi_capa);
189 }
190
191 static inline void osc_set_capa_size(struct ptlrpc_request *req,
192                                      const struct req_msg_field *field,
193                                      struct obd_capa *oc)
194 {
195         if (oc == NULL)
196                 req_capsule_set_size(&req->rq_pill, field, RCL_CLIENT, 0);
197         else
198                 /* it is already calculated as sizeof struct obd_capa */
199                 ;
200 }
201
202 static int osc_getattr_interpret(const struct lu_env *env,
203                                  struct ptlrpc_request *req,
204                                  struct osc_async_args *aa, int rc)
205 {
206         struct ost_body *body;
207         ENTRY;
208
209         if (rc != 0)
210                 GOTO(out, rc);
211
212         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
213         if (body) {
214                 CDEBUG(D_INODE, "mode: %o\n", body->oa.o_mode);
215                 lustre_get_wire_obdo(aa->aa_oi->oi_oa, &body->oa);
216
217                 /* This should really be sent by the OST */
218                 aa->aa_oi->oi_oa->o_blksize = DT_MAX_BRW_SIZE;
219                 aa->aa_oi->oi_oa->o_valid |= OBD_MD_FLBLKSZ;
220         } else {
221                 CDEBUG(D_INFO, "can't unpack ost_body\n");
222                 rc = -EPROTO;
223                 aa->aa_oi->oi_oa->o_valid = 0;
224         }
225 out:
226         rc = aa->aa_oi->oi_cb_up(aa->aa_oi, rc);
227         RETURN(rc);
228 }
229
230 static int osc_getattr_async(struct obd_export *exp, struct obd_info *oinfo,
231                              struct ptlrpc_request_set *set)
232 {
233         struct ptlrpc_request *req;
234         struct osc_async_args *aa;
235         int                    rc;
236         ENTRY;
237
238         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_GETATTR);
239         if (req == NULL)
240                 RETURN(-ENOMEM);
241
242         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
243         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GETATTR);
244         if (rc) {
245                 ptlrpc_request_free(req);
246                 RETURN(rc);
247         }
248
249         osc_pack_req_body(req, oinfo);
250
251         ptlrpc_request_set_replen(req);
252         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_getattr_interpret;
253
254         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
255         aa = ptlrpc_req_async_args(req);
256         aa->aa_oi = oinfo;
257
258         ptlrpc_set_add_req(set, req);
259         RETURN(0);
260 }
261
262 static int osc_getattr(const struct lu_env *env, struct obd_export *exp,
263                        struct obd_info *oinfo)
264 {
265         struct ptlrpc_request *req;
266         struct ost_body       *body;
267         int                    rc;
268         ENTRY;
269
270         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_GETATTR);
271         if (req == NULL)
272                 RETURN(-ENOMEM);
273
274         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
275         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GETATTR);
276         if (rc) {
277                 ptlrpc_request_free(req);
278                 RETURN(rc);
279         }
280
281         osc_pack_req_body(req, oinfo);
282
283         ptlrpc_request_set_replen(req);
284
285         rc = ptlrpc_queue_wait(req);
286         if (rc)
287                 GOTO(out, rc);
288
289         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
290         if (body == NULL)
291                 GOTO(out, rc = -EPROTO);
292
293         CDEBUG(D_INODE, "mode: %o\n", body->oa.o_mode);
294         lustre_get_wire_obdo(oinfo->oi_oa, &body->oa);
295
296         oinfo->oi_oa->o_blksize = cli_brw_size(exp->exp_obd);
297         oinfo->oi_oa->o_valid |= OBD_MD_FLBLKSZ;
298
299         EXIT;
300  out:
301         ptlrpc_req_finished(req);
302         return rc;
303 }
304
305 static int osc_setattr(const struct lu_env *env, struct obd_export *exp,
306                        struct obd_info *oinfo, struct obd_trans_info *oti)
307 {
308         struct ptlrpc_request *req;
309         struct ost_body       *body;
310         int                    rc;
311         ENTRY;
312
313         LASSERT(oinfo->oi_oa->o_valid & OBD_MD_FLGROUP);
314
315         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SETATTR);
316         if (req == NULL)
317                 RETURN(-ENOMEM);
318
319         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
320         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SETATTR);
321         if (rc) {
322                 ptlrpc_request_free(req);
323                 RETURN(rc);
324         }
325
326         osc_pack_req_body(req, oinfo);
327
328         ptlrpc_request_set_replen(req);
329
330         rc = ptlrpc_queue_wait(req);
331         if (rc)
332                 GOTO(out, rc);
333
334         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
335         if (body == NULL)
336                 GOTO(out, rc = -EPROTO);
337
338         lustre_get_wire_obdo(oinfo->oi_oa, &body->oa);
339
340         EXIT;
341 out:
342         ptlrpc_req_finished(req);
343         RETURN(rc);
344 }
345
346 static int osc_setattr_interpret(const struct lu_env *env,
347                                  struct ptlrpc_request *req,
348                                  struct osc_setattr_args *sa, int rc)
349 {
350         struct ost_body *body;
351         ENTRY;
352
353         if (rc != 0)
354                 GOTO(out, rc);
355
356         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
357         if (body == NULL)
358                 GOTO(out, rc = -EPROTO);
359
360         lustre_get_wire_obdo(sa->sa_oa, &body->oa);
361 out:
362         rc = sa->sa_upcall(sa->sa_cookie, rc);
363         RETURN(rc);
364 }
365
366 int osc_setattr_async_base(struct obd_export *exp, struct obd_info *oinfo,
367                            struct obd_trans_info *oti,
368                            obd_enqueue_update_f upcall, void *cookie,
369                            struct ptlrpc_request_set *rqset)
370 {
371         struct ptlrpc_request   *req;
372         struct osc_setattr_args *sa;
373         int                      rc;
374         ENTRY;
375
376         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SETATTR);
377         if (req == NULL)
378                 RETURN(-ENOMEM);
379
380         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
381         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SETATTR);
382         if (rc) {
383                 ptlrpc_request_free(req);
384                 RETURN(rc);
385         }
386
387         if (oti && oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE)
388                 oinfo->oi_oa->o_lcookie = *oti->oti_logcookies;
389
390         osc_pack_req_body(req, oinfo);
391
392         ptlrpc_request_set_replen(req);
393
394         /* do mds to ost setattr asynchronously */
395         if (!rqset) {
396                 /* Do not wait for response. */
397                 ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
398         } else {
399                 req->rq_interpret_reply =
400                         (ptlrpc_interpterer_t)osc_setattr_interpret;
401
402                 CLASSERT (sizeof(*sa) <= sizeof(req->rq_async_args));
403                 sa = ptlrpc_req_async_args(req);
404                 sa->sa_oa = oinfo->oi_oa;
405                 sa->sa_upcall = upcall;
406                 sa->sa_cookie = cookie;
407
408                 if (rqset == PTLRPCD_SET)
409                         ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
410                 else
411                         ptlrpc_set_add_req(rqset, req);
412         }
413
414         RETURN(0);
415 }
416
417 static int osc_setattr_async(struct obd_export *exp, struct obd_info *oinfo,
418                              struct obd_trans_info *oti,
419                              struct ptlrpc_request_set *rqset)
420 {
421         return osc_setattr_async_base(exp, oinfo, oti,
422                                       oinfo->oi_cb_up, oinfo, rqset);
423 }
424
425 int osc_real_create(struct obd_export *exp, struct obdo *oa,
426                     struct lov_stripe_md **ea, struct obd_trans_info *oti)
427 {
428         struct ptlrpc_request *req;
429         struct ost_body       *body;
430         struct lov_stripe_md  *lsm;
431         int                    rc;
432         ENTRY;
433
434         LASSERT(oa);
435         LASSERT(ea);
436
437         lsm = *ea;
438         if (!lsm) {
439                 rc = obd_alloc_memmd(exp, &lsm);
440                 if (rc < 0)
441                         RETURN(rc);
442         }
443
444         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_CREATE);
445         if (req == NULL)
446                 GOTO(out, rc = -ENOMEM);
447
448         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
449         if (rc) {
450                 ptlrpc_request_free(req);
451                 GOTO(out, rc);
452         }
453
454         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
455         LASSERT(body);
456         lustre_set_wire_obdo(&body->oa, oa);
457
458         ptlrpc_request_set_replen(req);
459
460         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
461             oa->o_flags == OBD_FL_DELORPHAN) {
462                 DEBUG_REQ(D_HA, req,
463                           "delorphan from OST integration");
464                 /* Don't resend the delorphan req */
465                 req->rq_no_resend = req->rq_no_delay = 1;
466         }
467
468         rc = ptlrpc_queue_wait(req);
469         if (rc)
470                 GOTO(out_req, rc);
471
472         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
473         if (body == NULL)
474                 GOTO(out_req, rc = -EPROTO);
475
476         lustre_get_wire_obdo(oa, &body->oa);
477
478         oa->o_blksize = cli_brw_size(exp->exp_obd);
479         oa->o_valid |= OBD_MD_FLBLKSZ;
480
481         /* XXX LOV STACKING: the lsm that is passed to us from LOV does not
482          * have valid lsm_oinfo data structs, so don't go touching that.
483          * This needs to be fixed in a big way.
484          */
485         lsm->lsm_oi = oa->o_oi;
486         *ea = lsm;
487
488         if (oti != NULL) {
489                 oti->oti_transno = lustre_msg_get_transno(req->rq_repmsg);
490
491                 if (oa->o_valid & OBD_MD_FLCOOKIE) {
492                         if (!oti->oti_logcookies)
493                                 oti_alloc_cookies(oti, 1);
494                         *oti->oti_logcookies = oa->o_lcookie;
495                 }
496         }
497
498         CDEBUG(D_HA, "transno: "LPD64"\n",
499                lustre_msg_get_transno(req->rq_repmsg));
500 out_req:
501         ptlrpc_req_finished(req);
502 out:
503         if (rc && !*ea)
504                 obd_free_memmd(exp, &lsm);
505         RETURN(rc);
506 }
507
508 int osc_punch_base(struct obd_export *exp, struct obd_info *oinfo,
509                    obd_enqueue_update_f upcall, void *cookie,
510                    struct ptlrpc_request_set *rqset)
511 {
512         struct ptlrpc_request   *req;
513         struct osc_setattr_args *sa;
514         struct ost_body         *body;
515         int                      rc;
516         ENTRY;
517
518         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_PUNCH);
519         if (req == NULL)
520                 RETURN(-ENOMEM);
521
522         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
523         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_PUNCH);
524         if (rc) {
525                 ptlrpc_request_free(req);
526                 RETURN(rc);
527         }
528         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
529         ptlrpc_at_set_req_timeout(req);
530
531         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
532         LASSERT(body);
533         lustre_set_wire_obdo(&body->oa, oinfo->oi_oa);
534         osc_pack_capa(req, body, oinfo->oi_capa);
535
536         ptlrpc_request_set_replen(req);
537
538         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_setattr_interpret;
539         CLASSERT (sizeof(*sa) <= sizeof(req->rq_async_args));
540         sa = ptlrpc_req_async_args(req);
541         sa->sa_oa     = oinfo->oi_oa;
542         sa->sa_upcall = upcall;
543         sa->sa_cookie = cookie;
544         if (rqset == PTLRPCD_SET)
545                 ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
546         else
547                 ptlrpc_set_add_req(rqset, req);
548
549         RETURN(0);
550 }
551
552 static int osc_punch(const struct lu_env *env, struct obd_export *exp,
553                      struct obd_info *oinfo, struct obd_trans_info *oti,
554                      struct ptlrpc_request_set *rqset)
555 {
556         oinfo->oi_oa->o_size   = oinfo->oi_policy.l_extent.start;
557         oinfo->oi_oa->o_blocks = oinfo->oi_policy.l_extent.end;
558         oinfo->oi_oa->o_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
559         return osc_punch_base(exp, oinfo,
560                               oinfo->oi_cb_up, oinfo, rqset);
561 }
562
563 static int osc_sync_interpret(const struct lu_env *env,
564                               struct ptlrpc_request *req,
565                               void *arg, int rc)
566 {
567         struct osc_fsync_args *fa = arg;
568         struct ost_body *body;
569         ENTRY;
570
571         if (rc)
572                 GOTO(out, rc);
573
574         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
575         if (body == NULL) {
576                 CERROR ("can't unpack ost_body\n");
577                 GOTO(out, rc = -EPROTO);
578         }
579
580         *fa->fa_oi->oi_oa = body->oa;
581 out:
582         rc = fa->fa_upcall(fa->fa_cookie, rc);
583         RETURN(rc);
584 }
585
586 int osc_sync_base(struct obd_export *exp, struct obd_info *oinfo,
587                   obd_enqueue_update_f upcall, void *cookie,
588                   struct ptlrpc_request_set *rqset)
589 {
590         struct ptlrpc_request *req;
591         struct ost_body       *body;
592         struct osc_fsync_args *fa;
593         int                    rc;
594         ENTRY;
595
596         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SYNC);
597         if (req == NULL)
598                 RETURN(-ENOMEM);
599
600         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
601         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SYNC);
602         if (rc) {
603                 ptlrpc_request_free(req);
604                 RETURN(rc);
605         }
606
607         /* overload the size and blocks fields in the oa with start/end */
608         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
609         LASSERT(body);
610         lustre_set_wire_obdo(&body->oa, oinfo->oi_oa);
611         osc_pack_capa(req, body, oinfo->oi_capa);
612
613         ptlrpc_request_set_replen(req);
614         req->rq_interpret_reply = osc_sync_interpret;
615
616         CLASSERT(sizeof(*fa) <= sizeof(req->rq_async_args));
617         fa = ptlrpc_req_async_args(req);
618         fa->fa_oi = oinfo;
619         fa->fa_upcall = upcall;
620         fa->fa_cookie = cookie;
621
622         if (rqset == PTLRPCD_SET)
623                 ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
624         else
625                 ptlrpc_set_add_req(rqset, req);
626
627         RETURN (0);
628 }
629
630 static int osc_sync(const struct lu_env *env, struct obd_export *exp,
631                     struct obd_info *oinfo, obd_size start, obd_size end,
632                     struct ptlrpc_request_set *set)
633 {
634         ENTRY;
635
636         if (!oinfo->oi_oa) {
637                 CDEBUG(D_INFO, "oa NULL\n");
638                 RETURN(-EINVAL);
639         }
640
641         oinfo->oi_oa->o_size = start;
642         oinfo->oi_oa->o_blocks = end;
643         oinfo->oi_oa->o_valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS);
644
645         RETURN(osc_sync_base(exp, oinfo, oinfo->oi_cb_up, oinfo, set));
646 }
647
648 /* Find and cancel locally locks matched by @mode in the resource found by
649  * @objid. Found locks are added into @cancel list. Returns the amount of
650  * locks added to @cancels list. */
651 static int osc_resource_get_unused(struct obd_export *exp, struct obdo *oa,
652                                    cfs_list_t *cancels,
653                                    ldlm_mode_t mode, int lock_flags)
654 {
655         struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
656         struct ldlm_res_id res_id;
657         struct ldlm_resource *res;
658         int count;
659         ENTRY;
660
661         /* Return, i.e. cancel nothing, only if ELC is supported (flag in
662          * export) but disabled through procfs (flag in NS).
663          *
664          * This distinguishes from a case when ELC is not supported originally,
665          * when we still want to cancel locks in advance and just cancel them
666          * locally, without sending any RPC. */
667         if (exp_connect_cancelset(exp) && !ns_connect_cancelset(ns))
668                 RETURN(0);
669
670         ostid_build_res_name(&oa->o_oi, &res_id);
671         res = ldlm_resource_get(ns, NULL, &res_id, 0, 0);
672         if (res == NULL)
673                 RETURN(0);
674
675         LDLM_RESOURCE_ADDREF(res);
676         count = ldlm_cancel_resource_local(res, cancels, NULL, mode,
677                                            lock_flags, 0, NULL);
678         LDLM_RESOURCE_DELREF(res);
679         ldlm_resource_putref(res);
680         RETURN(count);
681 }
682
683 static int osc_destroy_interpret(const struct lu_env *env,
684                                  struct ptlrpc_request *req, void *data,
685                                  int rc)
686 {
687         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
688
689         cfs_atomic_dec(&cli->cl_destroy_in_flight);
690         cfs_waitq_signal(&cli->cl_destroy_waitq);
691         return 0;
692 }
693
694 static int osc_can_send_destroy(struct client_obd *cli)
695 {
696         if (cfs_atomic_inc_return(&cli->cl_destroy_in_flight) <=
697             cli->cl_max_rpcs_in_flight) {
698                 /* The destroy request can be sent */
699                 return 1;
700         }
701         if (cfs_atomic_dec_return(&cli->cl_destroy_in_flight) <
702             cli->cl_max_rpcs_in_flight) {
703                 /*
704                  * The counter has been modified between the two atomic
705                  * operations.
706                  */
707                 cfs_waitq_signal(&cli->cl_destroy_waitq);
708         }
709         return 0;
710 }
711
712 int osc_create(const struct lu_env *env, struct obd_export *exp,
713                struct obdo *oa, struct lov_stripe_md **ea,
714                struct obd_trans_info *oti)
715 {
716         int rc = 0;
717         ENTRY;
718
719         LASSERT(oa);
720         LASSERT(ea);
721         LASSERT(oa->o_valid & OBD_MD_FLGROUP);
722
723         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
724             oa->o_flags == OBD_FL_RECREATE_OBJS) {
725                 RETURN(osc_real_create(exp, oa, ea, oti));
726         }
727
728         if (!fid_seq_is_mdt(ostid_seq(&oa->o_oi)))
729                 RETURN(osc_real_create(exp, oa, ea, oti));
730
731         /* we should not get here anymore */
732         LBUG();
733
734         RETURN(rc);
735 }
736
737 /* Destroy requests can be async always on the client, and we don't even really
738  * care about the return code since the client cannot do anything at all about
739  * a destroy failure.
740  * When the MDS is unlinking a filename, it saves the file objects into a
741  * recovery llog, and these object records are cancelled when the OST reports
742  * they were destroyed and sync'd to disk (i.e. transaction committed).
743  * If the client dies, or the OST is down when the object should be destroyed,
744  * the records are not cancelled, and when the OST reconnects to the MDS next,
745  * it will retrieve the llog unlink logs and then sends the log cancellation
746  * cookies to the MDS after committing destroy transactions. */
747 static int osc_destroy(const struct lu_env *env, struct obd_export *exp,
748                        struct obdo *oa, struct lov_stripe_md *ea,
749                        struct obd_trans_info *oti, struct obd_export *md_export,
750                        void *capa)
751 {
752         struct client_obd     *cli = &exp->exp_obd->u.cli;
753         struct ptlrpc_request *req;
754         struct ost_body       *body;
755         CFS_LIST_HEAD(cancels);
756         int rc, count;
757         ENTRY;
758
759         if (!oa) {
760                 CDEBUG(D_INFO, "oa NULL\n");
761                 RETURN(-EINVAL);
762         }
763
764         count = osc_resource_get_unused(exp, oa, &cancels, LCK_PW,
765                                         LDLM_FL_DISCARD_DATA);
766
767         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_DESTROY);
768         if (req == NULL) {
769                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
770                 RETURN(-ENOMEM);
771         }
772
773         osc_set_capa_size(req, &RMF_CAPA1, (struct obd_capa *)capa);
774         rc = ldlm_prep_elc_req(exp, req, LUSTRE_OST_VERSION, OST_DESTROY,
775                                0, &cancels, count);
776         if (rc) {
777                 ptlrpc_request_free(req);
778                 RETURN(rc);
779         }
780
781         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
782         ptlrpc_at_set_req_timeout(req);
783
784         if (oti != NULL && oa->o_valid & OBD_MD_FLCOOKIE)
785                 oa->o_lcookie = *oti->oti_logcookies;
786         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
787         LASSERT(body);
788         lustre_set_wire_obdo(&body->oa, oa);
789
790         osc_pack_capa(req, body, (struct obd_capa *)capa);
791         ptlrpc_request_set_replen(req);
792
793         /* If osc_destory is for destroying the unlink orphan,
794          * sent from MDT to OST, which should not be blocked here,
795          * because the process might be triggered by ptlrpcd, and
796          * it is not good to block ptlrpcd thread (b=16006)*/
797         if (!(oa->o_flags & OBD_FL_DELORPHAN)) {
798                 req->rq_interpret_reply = osc_destroy_interpret;
799                 if (!osc_can_send_destroy(cli)) {
800                         struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP,
801                                                           NULL);
802
803                         /*
804                          * Wait until the number of on-going destroy RPCs drops
805                          * under max_rpc_in_flight
806                          */
807                         l_wait_event_exclusive(cli->cl_destroy_waitq,
808                                                osc_can_send_destroy(cli), &lwi);
809                 }
810         }
811
812         /* Do not wait for response */
813         ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
814         RETURN(0);
815 }
816
817 static void osc_announce_cached(struct client_obd *cli, struct obdo *oa,
818                                 long writing_bytes)
819 {
820         obd_flag bits = OBD_MD_FLBLOCKS|OBD_MD_FLGRANT;
821
822         LASSERT(!(oa->o_valid & bits));
823
824         oa->o_valid |= bits;
825         client_obd_list_lock(&cli->cl_loi_list_lock);
826         oa->o_dirty = cli->cl_dirty;
827         if (unlikely(cli->cl_dirty - cli->cl_dirty_transit >
828                      cli->cl_dirty_max)) {
829                 CERROR("dirty %lu - %lu > dirty_max %lu\n",
830                        cli->cl_dirty, cli->cl_dirty_transit, cli->cl_dirty_max);
831                 oa->o_undirty = 0;
832         } else if (unlikely(cfs_atomic_read(&obd_unstable_pages) +
833                             cfs_atomic_read(&obd_dirty_pages) -
834                             cfs_atomic_read(&obd_dirty_transit_pages) >
835                             (long)(obd_max_dirty_pages + 1))) {
836                 /* The cfs_atomic_read() allowing the cfs_atomic_inc() are
837                  * not covered by a lock thus they may safely race and trip
838                  * this CERROR() unless we add in a small fudge factor (+1). */
839                 CERROR("%s: dirty %d + %d - %d > system dirty_max %d\n",
840                        cli->cl_import->imp_obd->obd_name,
841                        cfs_atomic_read(&obd_unstable_pages),
842                        cfs_atomic_read(&obd_dirty_pages),
843                        cfs_atomic_read(&obd_dirty_transit_pages),
844                        obd_max_dirty_pages);
845                 oa->o_undirty = 0;
846         } else if (unlikely(cli->cl_dirty_max - cli->cl_dirty > 0x7fffffff)) {
847                 CERROR("dirty %lu - dirty_max %lu too big???\n",
848                        cli->cl_dirty, cli->cl_dirty_max);
849                 oa->o_undirty = 0;
850         } else {
851                 long max_in_flight = (cli->cl_max_pages_per_rpc <<
852                                       CFS_PAGE_SHIFT)*
853                                      (cli->cl_max_rpcs_in_flight + 1);
854                 oa->o_undirty = max(cli->cl_dirty_max, max_in_flight);
855         }
856         oa->o_grant = cli->cl_avail_grant + cli->cl_reserved_grant;
857         oa->o_dropped = cli->cl_lost_grant;
858         cli->cl_lost_grant = 0;
859         client_obd_list_unlock(&cli->cl_loi_list_lock);
860         CDEBUG(D_CACHE,"dirty: "LPU64" undirty: %u dropped %u grant: "LPU64"\n",
861                oa->o_dirty, oa->o_undirty, oa->o_dropped, oa->o_grant);
862
863 }
864
865 void osc_update_next_shrink(struct client_obd *cli)
866 {
867         cli->cl_next_shrink_grant =
868                 cfs_time_shift(cli->cl_grant_shrink_interval);
869         CDEBUG(D_CACHE, "next time %ld to shrink grant \n",
870                cli->cl_next_shrink_grant);
871 }
872
873 static void __osc_update_grant(struct client_obd *cli, obd_size grant)
874 {
875         client_obd_list_lock(&cli->cl_loi_list_lock);
876         cli->cl_avail_grant += grant;
877         client_obd_list_unlock(&cli->cl_loi_list_lock);
878 }
879
880 static void osc_update_grant(struct client_obd *cli, struct ost_body *body)
881 {
882         if (body->oa.o_valid & OBD_MD_FLGRANT) {
883                 CDEBUG(D_CACHE, "got "LPU64" extra grant\n", body->oa.o_grant);
884                 __osc_update_grant(cli, body->oa.o_grant);
885         }
886 }
887
888 static int osc_set_info_async(const struct lu_env *env, struct obd_export *exp,
889                               obd_count keylen, void *key, obd_count vallen,
890                               void *val, struct ptlrpc_request_set *set);
891
892 static int osc_shrink_grant_interpret(const struct lu_env *env,
893                                       struct ptlrpc_request *req,
894                                       void *aa, int rc)
895 {
896         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
897         struct obdo *oa = ((struct osc_grant_args *)aa)->aa_oa;
898         struct ost_body *body;
899
900         if (rc != 0) {
901                 __osc_update_grant(cli, oa->o_grant);
902                 GOTO(out, rc);
903         }
904
905         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
906         LASSERT(body);
907         osc_update_grant(cli, body);
908 out:
909         OBDO_FREE(oa);
910         return rc;
911 }
912
913 static void osc_shrink_grant_local(struct client_obd *cli, struct obdo *oa)
914 {
915         client_obd_list_lock(&cli->cl_loi_list_lock);
916         oa->o_grant = cli->cl_avail_grant / 4;
917         cli->cl_avail_grant -= oa->o_grant;
918         client_obd_list_unlock(&cli->cl_loi_list_lock);
919         if (!(oa->o_valid & OBD_MD_FLFLAGS)) {
920                 oa->o_valid |= OBD_MD_FLFLAGS;
921                 oa->o_flags = 0;
922         }
923         oa->o_flags |= OBD_FL_SHRINK_GRANT;
924         osc_update_next_shrink(cli);
925 }
926
927 /* Shrink the current grant, either from some large amount to enough for a
928  * full set of in-flight RPCs, or if we have already shrunk to that limit
929  * then to enough for a single RPC.  This avoids keeping more grant than
930  * needed, and avoids shrinking the grant piecemeal. */
931 static int osc_shrink_grant(struct client_obd *cli)
932 {
933         __u64 target_bytes = (cli->cl_max_rpcs_in_flight + 1) *
934                              (cli->cl_max_pages_per_rpc << CFS_PAGE_SHIFT);
935
936         client_obd_list_lock(&cli->cl_loi_list_lock);
937         if (cli->cl_avail_grant <= target_bytes)
938                 target_bytes = cli->cl_max_pages_per_rpc << CFS_PAGE_SHIFT;
939         client_obd_list_unlock(&cli->cl_loi_list_lock);
940
941         return osc_shrink_grant_to_target(cli, target_bytes);
942 }
943
944 int osc_shrink_grant_to_target(struct client_obd *cli, __u64 target_bytes)
945 {
946         int                     rc = 0;
947         struct ost_body        *body;
948         ENTRY;
949
950         client_obd_list_lock(&cli->cl_loi_list_lock);
951         /* Don't shrink if we are already above or below the desired limit
952          * We don't want to shrink below a single RPC, as that will negatively
953          * impact block allocation and long-term performance. */
954         if (target_bytes < cli->cl_max_pages_per_rpc << CFS_PAGE_SHIFT)
955                 target_bytes = cli->cl_max_pages_per_rpc << CFS_PAGE_SHIFT;
956
957         if (target_bytes >= cli->cl_avail_grant) {
958                 client_obd_list_unlock(&cli->cl_loi_list_lock);
959                 RETURN(0);
960         }
961         client_obd_list_unlock(&cli->cl_loi_list_lock);
962
963         OBD_ALLOC_PTR(body);
964         if (!body)
965                 RETURN(-ENOMEM);
966
967         osc_announce_cached(cli, &body->oa, 0);
968
969         client_obd_list_lock(&cli->cl_loi_list_lock);
970         body->oa.o_grant = cli->cl_avail_grant - target_bytes;
971         cli->cl_avail_grant = target_bytes;
972         client_obd_list_unlock(&cli->cl_loi_list_lock);
973         if (!(body->oa.o_valid & OBD_MD_FLFLAGS)) {
974                 body->oa.o_valid |= OBD_MD_FLFLAGS;
975                 body->oa.o_flags = 0;
976         }
977         body->oa.o_flags |= OBD_FL_SHRINK_GRANT;
978         osc_update_next_shrink(cli);
979
980         rc = osc_set_info_async(NULL, cli->cl_import->imp_obd->obd_self_export,
981                                 sizeof(KEY_GRANT_SHRINK), KEY_GRANT_SHRINK,
982                                 sizeof(*body), body, NULL);
983         if (rc != 0)
984                 __osc_update_grant(cli, body->oa.o_grant);
985         OBD_FREE_PTR(body);
986         RETURN(rc);
987 }
988
989 static int osc_should_shrink_grant(struct client_obd *client)
990 {
991         cfs_time_t time = cfs_time_current();
992         cfs_time_t next_shrink = client->cl_next_shrink_grant;
993
994         if ((client->cl_import->imp_connect_data.ocd_connect_flags &
995              OBD_CONNECT_GRANT_SHRINK) == 0)
996                 return 0;
997
998         if (cfs_time_aftereq(time, next_shrink - 5 * CFS_TICK)) {
999                 /* Get the current RPC size directly, instead of going via:
1000                  * cli_brw_size(obd->u.cli.cl_import->imp_obd->obd_self_export)
1001                  * Keep comment here so that it can be found by searching. */
1002                 int brw_size = client->cl_max_pages_per_rpc << CFS_PAGE_SHIFT;
1003
1004                 if (client->cl_import->imp_state == LUSTRE_IMP_FULL &&
1005                     client->cl_avail_grant > brw_size)
1006                         return 1;
1007                 else
1008                         osc_update_next_shrink(client);
1009         }
1010         return 0;
1011 }
1012
1013 static int osc_grant_shrink_grant_cb(struct timeout_item *item, void *data)
1014 {
1015         struct client_obd *client;
1016
1017         cfs_list_for_each_entry(client, &item->ti_obd_list,
1018                                 cl_grant_shrink_list) {
1019                 if (osc_should_shrink_grant(client))
1020                         osc_shrink_grant(client);
1021         }
1022         return 0;
1023 }
1024
1025 static int osc_add_shrink_grant(struct client_obd *client)
1026 {
1027         int rc;
1028
1029         rc = ptlrpc_add_timeout_client(client->cl_grant_shrink_interval,
1030                                        TIMEOUT_GRANT,
1031                                        osc_grant_shrink_grant_cb, NULL,
1032                                        &client->cl_grant_shrink_list);
1033         if (rc) {
1034                 CERROR("add grant client %s error %d\n",
1035                         client->cl_import->imp_obd->obd_name, rc);
1036                 return rc;
1037         }
1038         CDEBUG(D_CACHE, "add grant client %s \n",
1039                client->cl_import->imp_obd->obd_name);
1040         osc_update_next_shrink(client);
1041         return 0;
1042 }
1043
1044 static int osc_del_shrink_grant(struct client_obd *client)
1045 {
1046         return ptlrpc_del_timeout_client(&client->cl_grant_shrink_list,
1047                                          TIMEOUT_GRANT);
1048 }
1049
1050 static void osc_init_grant(struct client_obd *cli, struct obd_connect_data *ocd)
1051 {
1052         /*
1053          * ocd_grant is the total grant amount we're expect to hold: if we've
1054          * been evicted, it's the new avail_grant amount, cl_dirty will drop
1055          * to 0 as inflight RPCs fail out; otherwise, it's avail_grant + dirty.
1056          *
1057          * race is tolerable here: if we're evicted, but imp_state already
1058          * left EVICTED state, then cl_dirty must be 0 already.
1059          */
1060         client_obd_list_lock(&cli->cl_loi_list_lock);
1061         if (cli->cl_import->imp_state == LUSTRE_IMP_EVICTED)
1062                 cli->cl_avail_grant = ocd->ocd_grant;
1063         else
1064                 cli->cl_avail_grant = ocd->ocd_grant - cli->cl_dirty;
1065
1066         if (cli->cl_avail_grant < 0) {
1067                 CWARN("%s: available grant < 0: avail/ocd/dirty %ld/%u/%ld\n",
1068                       cli->cl_import->imp_obd->obd_name, cli->cl_avail_grant,
1069                       ocd->ocd_grant, cli->cl_dirty);
1070                 /* workaround for servers which do not have the patch from
1071                  * LU-2679 */
1072                 cli->cl_avail_grant = ocd->ocd_grant;
1073         }
1074
1075         /* determine the appropriate chunk size used by osc_extent. */
1076         cli->cl_chunkbits = max_t(int, CFS_PAGE_SHIFT, ocd->ocd_blocksize);
1077         client_obd_list_unlock(&cli->cl_loi_list_lock);
1078
1079         CDEBUG(D_CACHE, "%s, setting cl_avail_grant: %ld cl_lost_grant: %ld."
1080                 "chunk bits: %d.\n", cli->cl_import->imp_obd->obd_name,
1081                 cli->cl_avail_grant, cli->cl_lost_grant, cli->cl_chunkbits);
1082
1083         if (ocd->ocd_connect_flags & OBD_CONNECT_GRANT_SHRINK &&
1084             cfs_list_empty(&cli->cl_grant_shrink_list))
1085                 osc_add_shrink_grant(cli);
1086 }
1087
1088 /* We assume that the reason this OSC got a short read is because it read
1089  * beyond the end of a stripe file; i.e. lustre is reading a sparse file
1090  * via the LOV, and it _knows_ it's reading inside the file, it's just that
1091  * this stripe never got written at or beyond this stripe offset yet. */
1092 static void handle_short_read(int nob_read, obd_count page_count,
1093                               struct brw_page **pga)
1094 {
1095         char *ptr;
1096         int i = 0;
1097
1098         /* skip bytes read OK */
1099         while (nob_read > 0) {
1100                 LASSERT (page_count > 0);
1101
1102                 if (pga[i]->count > nob_read) {
1103                         /* EOF inside this page */
1104                         ptr = cfs_kmap(pga[i]->pg) +
1105                                 (pga[i]->off & ~CFS_PAGE_MASK);
1106                         memset(ptr + nob_read, 0, pga[i]->count - nob_read);
1107                         cfs_kunmap(pga[i]->pg);
1108                         page_count--;
1109                         i++;
1110                         break;
1111                 }
1112
1113                 nob_read -= pga[i]->count;
1114                 page_count--;
1115                 i++;
1116         }
1117
1118         /* zero remaining pages */
1119         while (page_count-- > 0) {
1120                 ptr = cfs_kmap(pga[i]->pg) + (pga[i]->off & ~CFS_PAGE_MASK);
1121                 memset(ptr, 0, pga[i]->count);
1122                 cfs_kunmap(pga[i]->pg);
1123                 i++;
1124         }
1125 }
1126
1127 static int check_write_rcs(struct ptlrpc_request *req,
1128                            int requested_nob, int niocount,
1129                            obd_count page_count, struct brw_page **pga)
1130 {
1131         int     i;
1132         __u32   *remote_rcs;
1133
1134         remote_rcs = req_capsule_server_sized_get(&req->rq_pill, &RMF_RCS,
1135                                                   sizeof(*remote_rcs) *
1136                                                   niocount);
1137         if (remote_rcs == NULL) {
1138                 CDEBUG(D_INFO, "Missing/short RC vector on BRW_WRITE reply\n");
1139                 return(-EPROTO);
1140         }
1141
1142         /* return error if any niobuf was in error */
1143         for (i = 0; i < niocount; i++) {
1144                 if ((int)remote_rcs[i] < 0)
1145                         return(remote_rcs[i]);
1146
1147                 if (remote_rcs[i] != 0) {
1148                         CDEBUG(D_INFO, "rc[%d] invalid (%d) req %p\n",
1149                                 i, remote_rcs[i], req);
1150                         return(-EPROTO);
1151                 }
1152         }
1153
1154         if (req->rq_bulk->bd_nob_transferred != requested_nob) {
1155                 CERROR("Unexpected # bytes transferred: %d (requested %d)\n",
1156                        req->rq_bulk->bd_nob_transferred, requested_nob);
1157                 return(-EPROTO);
1158         }
1159
1160         return (0);
1161 }
1162
1163 static inline int can_merge_pages(struct brw_page *p1, struct brw_page *p2)
1164 {
1165         if (p1->flag != p2->flag) {
1166                 unsigned mask = ~(OBD_BRW_FROM_GRANT| OBD_BRW_NOCACHE|
1167                                   OBD_BRW_SYNC|OBD_BRW_ASYNC|OBD_BRW_NOQUOTA);
1168
1169                 /* warn if we try to combine flags that we don't know to be
1170                  * safe to combine */
1171                 if (unlikely((p1->flag & mask) != (p2->flag & mask))) {
1172                         CWARN("Saw flags 0x%x and 0x%x in the same brw, please "
1173                               "report this at http://bugs.whamcloud.com/\n",
1174                               p1->flag, p2->flag);
1175                 }
1176                 return 0;
1177         }
1178
1179         return (p1->off + p1->count == p2->off);
1180 }
1181
1182 static obd_count osc_checksum_bulk(int nob, obd_count pg_count,
1183                                    struct brw_page **pga, int opc,
1184                                    cksum_type_t cksum_type)
1185 {
1186         __u32                           cksum;
1187         int                             i = 0;
1188         struct cfs_crypto_hash_desc     *hdesc;
1189         unsigned int                    bufsize;
1190         int                             err;
1191         unsigned char                   cfs_alg = cksum_obd2cfs(cksum_type);
1192
1193         LASSERT(pg_count > 0);
1194
1195         hdesc = cfs_crypto_hash_init(cfs_alg, NULL, 0);
1196         if (IS_ERR(hdesc)) {
1197                 CERROR("Unable to initialize checksum hash %s\n",
1198                        cfs_crypto_hash_name(cfs_alg));
1199                 return PTR_ERR(hdesc);
1200         }
1201
1202         while (nob > 0 && pg_count > 0) {
1203                 int count = pga[i]->count > nob ? nob : pga[i]->count;
1204
1205                 /* corrupt the data before we compute the checksum, to
1206                  * simulate an OST->client data error */
1207                 if (i == 0 && opc == OST_READ &&
1208                     OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_RECEIVE)) {
1209                         unsigned char *ptr = cfs_kmap(pga[i]->pg);
1210                         int off = pga[i]->off & ~CFS_PAGE_MASK;
1211                         memcpy(ptr + off, "bad1", min(4, nob));
1212                         cfs_kunmap(pga[i]->pg);
1213                 }
1214                 cfs_crypto_hash_update_page(hdesc, pga[i]->pg,
1215                                   pga[i]->off & ~CFS_PAGE_MASK,
1216                                   count);
1217                 LL_CDEBUG_PAGE(D_PAGE, pga[i]->pg, "off %d checksum %x\n",
1218                                (int)(pga[i]->off & ~CFS_PAGE_MASK), cksum);
1219
1220                 nob -= pga[i]->count;
1221                 pg_count--;
1222                 i++;
1223         }
1224
1225         bufsize = 4;
1226         err = cfs_crypto_hash_final(hdesc, (unsigned char *)&cksum, &bufsize);
1227
1228         if (err)
1229                 cfs_crypto_hash_final(hdesc, NULL, NULL);
1230
1231         /* For sending we only compute the wrong checksum instead
1232          * of corrupting the data so it is still correct on a redo */
1233         if (opc == OST_WRITE && OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_SEND))
1234                 cksum++;
1235
1236         return cksum;
1237 }
1238
1239 static int osc_brw_prep_request(int cmd, struct client_obd *cli,struct obdo *oa,
1240                                 struct lov_stripe_md *lsm, obd_count page_count,
1241                                 struct brw_page **pga,
1242                                 struct ptlrpc_request **reqp,
1243                                 struct obd_capa *ocapa, int reserve,
1244                                 int resend)
1245 {
1246         struct ptlrpc_request   *req;
1247         struct ptlrpc_bulk_desc *desc;
1248         struct ost_body         *body;
1249         struct obd_ioobj        *ioobj;
1250         struct niobuf_remote    *niobuf;
1251         int niocount, i, requested_nob, opc, rc;
1252         struct osc_brw_async_args *aa;
1253         struct req_capsule      *pill;
1254         struct brw_page *pg_prev;
1255
1256         ENTRY;
1257         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_BRW_PREP_REQ))
1258                 RETURN(-ENOMEM); /* Recoverable */
1259         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_BRW_PREP_REQ2))
1260                 RETURN(-EINVAL); /* Fatal */
1261
1262         if ((cmd & OBD_BRW_WRITE) != 0) {
1263                 opc = OST_WRITE;
1264                 req = ptlrpc_request_alloc_pool(cli->cl_import,
1265                                                 cli->cl_import->imp_rq_pool,
1266                                                 &RQF_OST_BRW_WRITE);
1267         } else {
1268                 opc = OST_READ;
1269                 req = ptlrpc_request_alloc(cli->cl_import, &RQF_OST_BRW_READ);
1270         }
1271         if (req == NULL)
1272                 RETURN(-ENOMEM);
1273
1274         for (niocount = i = 1; i < page_count; i++) {
1275                 if (!can_merge_pages(pga[i - 1], pga[i]))
1276                         niocount++;
1277         }
1278
1279         pill = &req->rq_pill;
1280         req_capsule_set_size(pill, &RMF_OBD_IOOBJ, RCL_CLIENT,
1281                              sizeof(*ioobj));
1282         req_capsule_set_size(pill, &RMF_NIOBUF_REMOTE, RCL_CLIENT,
1283                              niocount * sizeof(*niobuf));
1284         osc_set_capa_size(req, &RMF_CAPA1, ocapa);
1285
1286         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, opc);
1287         if (rc) {
1288                 ptlrpc_request_free(req);
1289                 RETURN(rc);
1290         }
1291         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
1292         ptlrpc_at_set_req_timeout(req);
1293         /* ask ptlrpc not to resend on EINPROGRESS since BRWs have their own
1294          * retry logic */
1295         req->rq_no_retry_einprogress = 1;
1296
1297         desc = ptlrpc_prep_bulk_imp(req, page_count,
1298                 cli->cl_import->imp_connect_data.ocd_brw_size >> LNET_MTU_BITS,
1299                 opc == OST_WRITE ? BULK_GET_SOURCE : BULK_PUT_SINK,
1300                 OST_BULK_PORTAL);
1301
1302         if (desc == NULL)
1303                 GOTO(out, rc = -ENOMEM);
1304         /* NB request now owns desc and will free it when it gets freed */
1305
1306         body = req_capsule_client_get(pill, &RMF_OST_BODY);
1307         ioobj = req_capsule_client_get(pill, &RMF_OBD_IOOBJ);
1308         niobuf = req_capsule_client_get(pill, &RMF_NIOBUF_REMOTE);
1309         LASSERT(body != NULL && ioobj != NULL && niobuf != NULL);
1310
1311         lustre_set_wire_obdo(&body->oa, oa);
1312
1313         obdo_to_ioobj(oa, ioobj);
1314         ioobj->ioo_bufcnt = niocount;
1315         /* The high bits of ioo_max_brw tells server _maximum_ number of bulks
1316          * that might be send for this request.  The actual number is decided
1317          * when the RPC is finally sent in ptlrpc_register_bulk(). It sends
1318          * "max - 1" for old client compatibility sending "0", and also so the
1319          * the actual maximum is a power-of-two number, not one less. LU-1431 */
1320         ioobj_max_brw_set(ioobj, desc->bd_md_max_brw);
1321         osc_pack_capa(req, body, ocapa);
1322         LASSERT(page_count > 0);
1323         pg_prev = pga[0];
1324         for (requested_nob = i = 0; i < page_count; i++, niobuf++) {
1325                 struct brw_page *pg = pga[i];
1326                 int poff = pg->off & ~CFS_PAGE_MASK;
1327
1328                 LASSERT(pg->count > 0);
1329                 /* make sure there is no gap in the middle of page array */
1330                 LASSERTF(page_count == 1 ||
1331                          (ergo(i == 0, poff + pg->count == CFS_PAGE_SIZE) &&
1332                           ergo(i > 0 && i < page_count - 1,
1333                                poff == 0 && pg->count == CFS_PAGE_SIZE)   &&
1334                           ergo(i == page_count - 1, poff == 0)),
1335                          "i: %d/%d pg: %p off: "LPU64", count: %u\n",
1336                          i, page_count, pg, pg->off, pg->count);
1337 #ifdef __linux__
1338                 LASSERTF(i == 0 || pg->off > pg_prev->off,
1339                          "i %d p_c %u pg %p [pri %lu ind %lu] off "LPU64
1340                          " prev_pg %p [pri %lu ind %lu] off "LPU64"\n",
1341                          i, page_count,
1342                          pg->pg, page_private(pg->pg), pg->pg->index, pg->off,
1343                          pg_prev->pg, page_private(pg_prev->pg),
1344                          pg_prev->pg->index, pg_prev->off);
1345 #else
1346                 LASSERTF(i == 0 || pg->off > pg_prev->off,
1347                          "i %d p_c %u\n", i, page_count);
1348 #endif
1349                 LASSERT((pga[0]->flag & OBD_BRW_SRVLOCK) ==
1350                         (pg->flag & OBD_BRW_SRVLOCK));
1351
1352                 ptlrpc_prep_bulk_page_pin(desc, pg->pg, poff, pg->count);
1353                 requested_nob += pg->count;
1354
1355                 if (i > 0 && can_merge_pages(pg_prev, pg)) {
1356                         niobuf--;
1357                         niobuf->len += pg->count;
1358                 } else {
1359                         niobuf->offset = pg->off;
1360                         niobuf->len    = pg->count;
1361                         niobuf->flags  = pg->flag;
1362                 }
1363                 pg_prev = pg;
1364         }
1365
1366         LASSERTF((void *)(niobuf - niocount) ==
1367                 req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE),
1368                 "want %p - real %p\n", req_capsule_client_get(&req->rq_pill,
1369                 &RMF_NIOBUF_REMOTE), (void *)(niobuf - niocount));
1370
1371         osc_announce_cached(cli, &body->oa, opc == OST_WRITE ? requested_nob:0);
1372         if (resend) {
1373                 if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0) {
1374                         body->oa.o_valid |= OBD_MD_FLFLAGS;
1375                         body->oa.o_flags = 0;
1376                 }
1377                 body->oa.o_flags |= OBD_FL_RECOV_RESEND;
1378         }
1379
1380         if (osc_should_shrink_grant(cli))
1381                 osc_shrink_grant_local(cli, &body->oa);
1382
1383         /* size[REQ_REC_OFF] still sizeof (*body) */
1384         if (opc == OST_WRITE) {
1385                 if (cli->cl_checksum &&
1386                     !sptlrpc_flavor_has_bulk(&req->rq_flvr)) {
1387                         /* store cl_cksum_type in a local variable since
1388                          * it can be changed via lprocfs */
1389                         cksum_type_t cksum_type = cli->cl_cksum_type;
1390
1391                         if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0) {
1392                                 oa->o_flags &= OBD_FL_LOCAL_MASK;
1393                                 body->oa.o_flags = 0;
1394                         }
1395                         body->oa.o_flags |= cksum_type_pack(cksum_type);
1396                         body->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1397                         body->oa.o_cksum = osc_checksum_bulk(requested_nob,
1398                                                              page_count, pga,
1399                                                              OST_WRITE,
1400                                                              cksum_type);
1401                         CDEBUG(D_PAGE, "checksum at write origin: %x\n",
1402                                body->oa.o_cksum);
1403                         /* save this in 'oa', too, for later checking */
1404                         oa->o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1405                         oa->o_flags |= cksum_type_pack(cksum_type);
1406                 } else {
1407                         /* clear out the checksum flag, in case this is a
1408                          * resend but cl_checksum is no longer set. b=11238 */
1409                         oa->o_valid &= ~OBD_MD_FLCKSUM;
1410                 }
1411                 oa->o_cksum = body->oa.o_cksum;
1412                 /* 1 RC per niobuf */
1413                 req_capsule_set_size(pill, &RMF_RCS, RCL_SERVER,
1414                                      sizeof(__u32) * niocount);
1415         } else {
1416                 if (cli->cl_checksum &&
1417                     !sptlrpc_flavor_has_bulk(&req->rq_flvr)) {
1418                         if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0)
1419                                 body->oa.o_flags = 0;
1420                         body->oa.o_flags |= cksum_type_pack(cli->cl_cksum_type);
1421                         body->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1422                 }
1423         }
1424         ptlrpc_request_set_replen(req);
1425
1426         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
1427         aa = ptlrpc_req_async_args(req);
1428         aa->aa_oa = oa;
1429         aa->aa_requested_nob = requested_nob;
1430         aa->aa_nio_count = niocount;
1431         aa->aa_page_count = page_count;
1432         aa->aa_resends = 0;
1433         aa->aa_ppga = pga;
1434         aa->aa_cli = cli;
1435         CFS_INIT_LIST_HEAD(&aa->aa_oaps);
1436         if (ocapa && reserve)
1437                 aa->aa_ocapa = capa_get(ocapa);
1438
1439         *reqp = req;
1440         RETURN(0);
1441
1442  out:
1443         ptlrpc_req_finished(req);
1444         RETURN(rc);
1445 }
1446
1447 static int check_write_checksum(struct obdo *oa, const lnet_process_id_t *peer,
1448                                 __u32 client_cksum, __u32 server_cksum, int nob,
1449                                 obd_count page_count, struct brw_page **pga,
1450                                 cksum_type_t client_cksum_type)
1451 {
1452         __u32 new_cksum;
1453         char *msg;
1454         cksum_type_t cksum_type;
1455
1456         if (server_cksum == client_cksum) {
1457                 CDEBUG(D_PAGE, "checksum %x confirmed\n", client_cksum);
1458                 return 0;
1459         }
1460
1461         cksum_type = cksum_type_unpack(oa->o_valid & OBD_MD_FLFLAGS ?
1462                                        oa->o_flags : 0);
1463         new_cksum = osc_checksum_bulk(nob, page_count, pga, OST_WRITE,
1464                                       cksum_type);
1465
1466         if (cksum_type != client_cksum_type)
1467                 msg = "the server did not use the checksum type specified in "
1468                       "the original request - likely a protocol problem";
1469         else if (new_cksum == server_cksum)
1470                 msg = "changed on the client after we checksummed it - "
1471                       "likely false positive due to mmap IO (bug 11742)";
1472         else if (new_cksum == client_cksum)
1473                 msg = "changed in transit before arrival at OST";
1474         else
1475                 msg = "changed in transit AND doesn't match the original - "
1476                       "likely false positive due to mmap IO (bug 11742)";
1477
1478         LCONSOLE_ERROR_MSG(0x132, "BAD WRITE CHECKSUM: %s: from %s inode "DFID
1479                            " object "DOSTID" extent ["LPU64"-"LPU64"]\n",
1480                            msg, libcfs_nid2str(peer->nid),
1481                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : (__u64)0,
1482                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1483                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1484                            POSTID(&oa->o_oi), pga[0]->off,
1485                            pga[page_count-1]->off + pga[page_count-1]->count - 1);
1486         CERROR("original client csum %x (type %x), server csum %x (type %x), "
1487                "client csum now %x\n", client_cksum, client_cksum_type,
1488                server_cksum, cksum_type, new_cksum);
1489         return 1;
1490 }
1491
1492 /* Note rc enters this function as number of bytes transferred */
1493 static int osc_brw_fini_request(struct ptlrpc_request *req, int rc)
1494 {
1495         struct osc_brw_async_args *aa = (void *)&req->rq_async_args;
1496         const lnet_process_id_t *peer =
1497                         &req->rq_import->imp_connection->c_peer;
1498         struct client_obd *cli = aa->aa_cli;
1499         struct ost_body *body;
1500         __u32 client_cksum = 0;
1501         ENTRY;
1502
1503         if (rc < 0 && rc != -EDQUOT) {
1504                 DEBUG_REQ(D_INFO, req, "Failed request with rc = %d\n", rc);
1505                 RETURN(rc);
1506         }
1507
1508         LASSERTF(req->rq_repmsg != NULL, "rc = %d\n", rc);
1509         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
1510         if (body == NULL) {
1511                 DEBUG_REQ(D_INFO, req, "Can't unpack body\n");
1512                 RETURN(-EPROTO);
1513         }
1514
1515         /* set/clear over quota flag for a uid/gid */
1516         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE &&
1517             body->oa.o_valid & (OBD_MD_FLUSRQUOTA | OBD_MD_FLGRPQUOTA)) {
1518                 unsigned int qid[MAXQUOTAS] = { body->oa.o_uid, body->oa.o_gid };
1519
1520                 CDEBUG(D_QUOTA, "setdq for [%u %u] with valid "LPX64", flags %x\n",
1521                        body->oa.o_uid, body->oa.o_gid, body->oa.o_valid,
1522                        body->oa.o_flags);
1523                 osc_quota_setdq(cli, qid, body->oa.o_valid, body->oa.o_flags);
1524         }
1525
1526         osc_update_grant(cli, body);
1527
1528         if (rc < 0)
1529                 RETURN(rc);
1530
1531         if (aa->aa_oa->o_valid & OBD_MD_FLCKSUM)
1532                 client_cksum = aa->aa_oa->o_cksum; /* save for later */
1533
1534         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE) {
1535                 if (rc > 0) {
1536                         CERROR("Unexpected +ve rc %d\n", rc);
1537                         RETURN(-EPROTO);
1538                 }
1539                 LASSERT(req->rq_bulk->bd_nob == aa->aa_requested_nob);
1540
1541                 if (sptlrpc_cli_unwrap_bulk_write(req, req->rq_bulk))
1542                         RETURN(-EAGAIN);
1543
1544                 if ((aa->aa_oa->o_valid & OBD_MD_FLCKSUM) && client_cksum &&
1545                     check_write_checksum(&body->oa, peer, client_cksum,
1546                                          body->oa.o_cksum, aa->aa_requested_nob,
1547                                          aa->aa_page_count, aa->aa_ppga,
1548                                          cksum_type_unpack(aa->aa_oa->o_flags)))
1549                         RETURN(-EAGAIN);
1550
1551                 rc = check_write_rcs(req, aa->aa_requested_nob,aa->aa_nio_count,
1552                                      aa->aa_page_count, aa->aa_ppga);
1553                 GOTO(out, rc);
1554         }
1555
1556         /* The rest of this function executes only for OST_READs */
1557
1558         /* if unwrap_bulk failed, return -EAGAIN to retry */
1559         rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, rc);
1560         if (rc < 0)
1561                 GOTO(out, rc = -EAGAIN);
1562
1563         if (rc > aa->aa_requested_nob) {
1564                 CERROR("Unexpected rc %d (%d requested)\n", rc,
1565                        aa->aa_requested_nob);
1566                 RETURN(-EPROTO);
1567         }
1568
1569         if (rc != req->rq_bulk->bd_nob_transferred) {
1570                 CERROR ("Unexpected rc %d (%d transferred)\n",
1571                         rc, req->rq_bulk->bd_nob_transferred);
1572                 return (-EPROTO);
1573         }
1574
1575         if (rc < aa->aa_requested_nob)
1576                 handle_short_read(rc, aa->aa_page_count, aa->aa_ppga);
1577
1578         if (body->oa.o_valid & OBD_MD_FLCKSUM) {
1579                 static int cksum_counter;
1580                 __u32      server_cksum = body->oa.o_cksum;
1581                 char      *via;
1582                 char      *router;
1583                 cksum_type_t cksum_type;
1584
1585                 cksum_type = cksum_type_unpack(body->oa.o_valid &OBD_MD_FLFLAGS?
1586                                                body->oa.o_flags : 0);
1587                 client_cksum = osc_checksum_bulk(rc, aa->aa_page_count,
1588                                                  aa->aa_ppga, OST_READ,
1589                                                  cksum_type);
1590
1591                 if (peer->nid == req->rq_bulk->bd_sender) {
1592                         via = router = "";
1593                 } else {
1594                         via = " via ";
1595                         router = libcfs_nid2str(req->rq_bulk->bd_sender);
1596                 }
1597
1598                 if (server_cksum == ~0 && rc > 0) {
1599                         CERROR("Protocol error: server %s set the 'checksum' "
1600                                "bit, but didn't send a checksum.  Not fatal, "
1601                                "but please notify on http://bugs.whamcloud.com/\n",
1602                                libcfs_nid2str(peer->nid));
1603                 } else if (server_cksum != client_cksum) {
1604                         LCONSOLE_ERROR_MSG(0x133, "%s: BAD READ CHECKSUM: from "
1605                                            "%s%s%s inode "DFID" object "DOSTID
1606                                            " extent ["LPU64"-"LPU64"]\n",
1607                                            req->rq_import->imp_obd->obd_name,
1608                                            libcfs_nid2str(peer->nid),
1609                                            via, router,
1610                                            body->oa.o_valid & OBD_MD_FLFID ?
1611                                                 body->oa.o_parent_seq : (__u64)0,
1612                                            body->oa.o_valid & OBD_MD_FLFID ?
1613                                                 body->oa.o_parent_oid : 0,
1614                                            body->oa.o_valid & OBD_MD_FLFID ?
1615                                                 body->oa.o_parent_ver : 0,
1616                                            POSTID(&body->oa.o_oi),
1617                                            aa->aa_ppga[0]->off,
1618                                            aa->aa_ppga[aa->aa_page_count-1]->off +
1619                                            aa->aa_ppga[aa->aa_page_count-1]->count -
1620                                                                         1);
1621                         CERROR("client %x, server %x, cksum_type %x\n",
1622                                client_cksum, server_cksum, cksum_type);
1623                         cksum_counter = 0;
1624                         aa->aa_oa->o_cksum = client_cksum;
1625                         rc = -EAGAIN;
1626                 } else {
1627                         cksum_counter++;
1628                         CDEBUG(D_PAGE, "checksum %x confirmed\n", client_cksum);
1629                         rc = 0;
1630                 }
1631         } else if (unlikely(client_cksum)) {
1632                 static int cksum_missed;
1633
1634                 cksum_missed++;
1635                 if ((cksum_missed & (-cksum_missed)) == cksum_missed)
1636                         CERROR("Checksum %u requested from %s but not sent\n",
1637                                cksum_missed, libcfs_nid2str(peer->nid));
1638         } else {
1639                 rc = 0;
1640         }
1641 out:
1642         if (rc >= 0)
1643                 lustre_get_wire_obdo(aa->aa_oa, &body->oa);
1644
1645         RETURN(rc);
1646 }
1647
1648 static int osc_brw_internal(int cmd, struct obd_export *exp, struct obdo *oa,
1649                             struct lov_stripe_md *lsm,
1650                             obd_count page_count, struct brw_page **pga,
1651                             struct obd_capa *ocapa)
1652 {
1653         struct ptlrpc_request *req;
1654         int                    rc;
1655         cfs_waitq_t            waitq;
1656         int                    generation, resends = 0;
1657         struct l_wait_info     lwi;
1658
1659         ENTRY;
1660
1661         cfs_waitq_init(&waitq);
1662         generation = exp->exp_obd->u.cli.cl_import->imp_generation;
1663
1664 restart_bulk:
1665         rc = osc_brw_prep_request(cmd, &exp->exp_obd->u.cli, oa, lsm,
1666                                   page_count, pga, &req, ocapa, 0, resends);
1667         if (rc != 0)
1668                 return (rc);
1669
1670         if (resends) {
1671                 req->rq_generation_set = 1;
1672                 req->rq_import_generation = generation;
1673                 req->rq_sent = cfs_time_current_sec() + resends;
1674         }
1675
1676         rc = ptlrpc_queue_wait(req);
1677
1678         if (rc == -ETIMEDOUT && req->rq_resend) {
1679                 DEBUG_REQ(D_HA, req,  "BULK TIMEOUT");
1680                 ptlrpc_req_finished(req);
1681                 goto restart_bulk;
1682         }
1683
1684         rc = osc_brw_fini_request(req, rc);
1685
1686         ptlrpc_req_finished(req);
1687         /* When server return -EINPROGRESS, client should always retry
1688          * regardless of the number of times the bulk was resent already.*/
1689         if (osc_recoverable_error(rc)) {
1690                 resends++;
1691                 if (rc != -EINPROGRESS &&
1692                     !client_should_resend(resends, &exp->exp_obd->u.cli)) {
1693                         CERROR("%s: too many resend retries for object: "
1694                                ""DOSTID", rc = %d.\n", exp->exp_obd->obd_name,
1695                                POSTID(&oa->o_oi), rc);
1696                         goto out;
1697                 }
1698                 if (generation !=
1699                     exp->exp_obd->u.cli.cl_import->imp_generation) {
1700                         CDEBUG(D_HA, "%s: resend cross eviction for object: "
1701                                ""DOSTID", rc = %d.\n", exp->exp_obd->obd_name,
1702                                POSTID(&oa->o_oi), rc);
1703                         goto out;
1704                 }
1705
1706                 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(resends), NULL, NULL,
1707                                        NULL);
1708                 l_wait_event(waitq, 0, &lwi);
1709
1710                 goto restart_bulk;
1711         }
1712 out:
1713         if (rc == -EAGAIN || rc == -EINPROGRESS)
1714                 rc = -EIO;
1715         RETURN (rc);
1716 }
1717
1718 static int osc_brw_redo_request(struct ptlrpc_request *request,
1719                                 struct osc_brw_async_args *aa, int rc)
1720 {
1721         struct ptlrpc_request *new_req;
1722         struct osc_brw_async_args *new_aa;
1723         struct osc_async_page *oap;
1724         ENTRY;
1725
1726         DEBUG_REQ(rc == -EINPROGRESS ? D_RPCTRACE : D_ERROR, request,
1727                   "redo for recoverable error %d", rc);
1728
1729         rc = osc_brw_prep_request(lustre_msg_get_opc(request->rq_reqmsg) ==
1730                                         OST_WRITE ? OBD_BRW_WRITE :OBD_BRW_READ,
1731                                   aa->aa_cli, aa->aa_oa,
1732                                   NULL /* lsm unused by osc currently */,
1733                                   aa->aa_page_count, aa->aa_ppga,
1734                                   &new_req, aa->aa_ocapa, 0, 1);
1735         if (rc)
1736                 RETURN(rc);
1737
1738         cfs_list_for_each_entry(oap, &aa->aa_oaps, oap_rpc_item) {
1739                 if (oap->oap_request != NULL) {
1740                         LASSERTF(request == oap->oap_request,
1741                                  "request %p != oap_request %p\n",
1742                                  request, oap->oap_request);
1743                         if (oap->oap_interrupted) {
1744                                 ptlrpc_req_finished(new_req);
1745                                 RETURN(-EINTR);
1746                         }
1747                 }
1748         }
1749         /* New request takes over pga and oaps from old request.
1750          * Note that copying a list_head doesn't work, need to move it... */
1751         aa->aa_resends++;
1752         new_req->rq_interpret_reply = request->rq_interpret_reply;
1753         new_req->rq_async_args = request->rq_async_args;
1754         new_req->rq_commit_cb = request->rq_commit_cb;
1755         /* cap resend delay to the current request timeout, this is similar to
1756          * what ptlrpc does (see after_reply()) */
1757         if (aa->aa_resends > new_req->rq_timeout)
1758                 new_req->rq_sent = cfs_time_current_sec() + new_req->rq_timeout;
1759         else
1760                 new_req->rq_sent = cfs_time_current_sec() + aa->aa_resends;
1761         new_req->rq_generation_set = 1;
1762         new_req->rq_import_generation = request->rq_import_generation;
1763
1764         new_aa = ptlrpc_req_async_args(new_req);
1765
1766         CFS_INIT_LIST_HEAD(&new_aa->aa_oaps);
1767         cfs_list_splice_init(&aa->aa_oaps, &new_aa->aa_oaps);
1768         CFS_INIT_LIST_HEAD(&new_aa->aa_exts);
1769         cfs_list_splice_init(&aa->aa_exts, &new_aa->aa_exts);
1770         new_aa->aa_resends = aa->aa_resends;
1771
1772         cfs_list_for_each_entry(oap, &new_aa->aa_oaps, oap_rpc_item) {
1773                 if (oap->oap_request) {
1774                         ptlrpc_req_finished(oap->oap_request);
1775                         oap->oap_request = ptlrpc_request_addref(new_req);
1776                 }
1777         }
1778
1779         new_aa->aa_ocapa = aa->aa_ocapa;
1780         aa->aa_ocapa = NULL;
1781
1782         /* XXX: This code will run into problem if we're going to support
1783          * to add a series of BRW RPCs into a self-defined ptlrpc_request_set
1784          * and wait for all of them to be finished. We should inherit request
1785          * set from old request. */
1786         ptlrpcd_add_req(new_req, PDL_POLICY_SAME, -1);
1787
1788         DEBUG_REQ(D_INFO, new_req, "new request");
1789         RETURN(0);
1790 }
1791
1792 /*
1793  * ugh, we want disk allocation on the target to happen in offset order.  we'll
1794  * follow sedgewicks advice and stick to the dead simple shellsort -- it'll do
1795  * fine for our small page arrays and doesn't require allocation.  its an
1796  * insertion sort that swaps elements that are strides apart, shrinking the
1797  * stride down until its '1' and the array is sorted.
1798  */
1799 static void sort_brw_pages(struct brw_page **array, int num)
1800 {
1801         int stride, i, j;
1802         struct brw_page *tmp;
1803
1804         if (num == 1)
1805                 return;
1806         for (stride = 1; stride < num ; stride = (stride * 3) + 1)
1807                 ;
1808
1809         do {
1810                 stride /= 3;
1811                 for (i = stride ; i < num ; i++) {
1812                         tmp = array[i];
1813                         j = i;
1814                         while (j >= stride && array[j - stride]->off > tmp->off) {
1815                                 array[j] = array[j - stride];
1816                                 j -= stride;
1817                         }
1818                         array[j] = tmp;
1819                 }
1820         } while (stride > 1);
1821 }
1822
1823 static obd_count max_unfragmented_pages(struct brw_page **pg, obd_count pages)
1824 {
1825         int count = 1;
1826         int offset;
1827         int i = 0;
1828
1829         LASSERT (pages > 0);
1830         offset = pg[i]->off & ~CFS_PAGE_MASK;
1831
1832         for (;;) {
1833                 pages--;
1834                 if (pages == 0)         /* that's all */
1835                         return count;
1836
1837                 if (offset + pg[i]->count < CFS_PAGE_SIZE)
1838                         return count;   /* doesn't end on page boundary */
1839
1840                 i++;
1841                 offset = pg[i]->off & ~CFS_PAGE_MASK;
1842                 if (offset != 0)        /* doesn't start on page boundary */
1843                         return count;
1844
1845                 count++;
1846         }
1847 }
1848
1849 static struct brw_page **osc_build_ppga(struct brw_page *pga, obd_count count)
1850 {
1851         struct brw_page **ppga;
1852         int i;
1853
1854         OBD_ALLOC(ppga, sizeof(*ppga) * count);
1855         if (ppga == NULL)
1856                 return NULL;
1857
1858         for (i = 0; i < count; i++)
1859                 ppga[i] = pga + i;
1860         return ppga;
1861 }
1862
1863 static void osc_release_ppga(struct brw_page **ppga, obd_count count)
1864 {
1865         LASSERT(ppga != NULL);
1866         OBD_FREE(ppga, sizeof(*ppga) * count);
1867 }
1868
1869 static int osc_brw(int cmd, struct obd_export *exp, struct obd_info *oinfo,
1870                    obd_count page_count, struct brw_page *pga,
1871                    struct obd_trans_info *oti)
1872 {
1873         struct obdo *saved_oa = NULL;
1874         struct brw_page **ppga, **orig;
1875         struct obd_import *imp = class_exp2cliimp(exp);
1876         struct client_obd *cli;
1877         int rc, page_count_orig;
1878         ENTRY;
1879
1880         LASSERT((imp != NULL) && (imp->imp_obd != NULL));
1881         cli = &imp->imp_obd->u.cli;
1882
1883         if (cmd & OBD_BRW_CHECK) {
1884                 /* The caller just wants to know if there's a chance that this
1885                  * I/O can succeed */
1886
1887                 if (imp->imp_invalid)
1888                         RETURN(-EIO);
1889                 RETURN(0);
1890         }
1891
1892         /* test_brw with a failed create can trip this, maybe others. */
1893         LASSERT(cli->cl_max_pages_per_rpc);
1894
1895         rc = 0;
1896
1897         orig = ppga = osc_build_ppga(pga, page_count);
1898         if (ppga == NULL)
1899                 RETURN(-ENOMEM);
1900         page_count_orig = page_count;
1901
1902         sort_brw_pages(ppga, page_count);
1903         while (page_count) {
1904                 obd_count pages_per_brw;
1905
1906                 if (page_count > cli->cl_max_pages_per_rpc)
1907                         pages_per_brw = cli->cl_max_pages_per_rpc;
1908                 else
1909                         pages_per_brw = page_count;
1910
1911                 pages_per_brw = max_unfragmented_pages(ppga, pages_per_brw);
1912
1913                 if (saved_oa != NULL) {
1914                         /* restore previously saved oa */
1915                         *oinfo->oi_oa = *saved_oa;
1916                 } else if (page_count > pages_per_brw) {
1917                         /* save a copy of oa (brw will clobber it) */
1918                         OBDO_ALLOC(saved_oa);
1919                         if (saved_oa == NULL)
1920                                 GOTO(out, rc = -ENOMEM);
1921                         *saved_oa = *oinfo->oi_oa;
1922                 }
1923
1924                 rc = osc_brw_internal(cmd, exp, oinfo->oi_oa, oinfo->oi_md,
1925                                       pages_per_brw, ppga, oinfo->oi_capa);
1926
1927                 if (rc != 0)
1928                         break;
1929
1930                 page_count -= pages_per_brw;
1931                 ppga += pages_per_brw;
1932         }
1933
1934 out:
1935         osc_release_ppga(orig, page_count_orig);
1936
1937         if (saved_oa != NULL)
1938                 OBDO_FREE(saved_oa);
1939
1940         RETURN(rc);
1941 }
1942
1943 static int brw_interpret(const struct lu_env *env,
1944                          struct ptlrpc_request *req, void *data, int rc)
1945 {
1946         struct osc_brw_async_args *aa = data;
1947         struct osc_extent *ext;
1948         struct osc_extent *tmp;
1949         struct cl_object  *obj = NULL;
1950         struct client_obd *cli = aa->aa_cli;
1951         ENTRY;
1952
1953         rc = osc_brw_fini_request(req, rc);
1954         CDEBUG(D_INODE, "request %p aa %p rc %d\n", req, aa, rc);
1955         /* When server return -EINPROGRESS, client should always retry
1956          * regardless of the number of times the bulk was resent already. */
1957         if (osc_recoverable_error(rc)) {
1958                 if (req->rq_import_generation !=
1959                     req->rq_import->imp_generation) {
1960                         CDEBUG(D_HA, "%s: resend cross eviction for object: "
1961                                ""DOSTID", rc = %d.\n",
1962                                req->rq_import->imp_obd->obd_name,
1963                                POSTID(&aa->aa_oa->o_oi), rc);
1964                 } else if (rc == -EINPROGRESS ||
1965                     client_should_resend(aa->aa_resends, aa->aa_cli)) {
1966                         rc = osc_brw_redo_request(req, aa, rc);
1967                 } else {
1968                         CERROR("%s: too many resent retries for object: "
1969                                ""LPU64":"LPU64", rc = %d.\n",
1970                                req->rq_import->imp_obd->obd_name,
1971                                POSTID(&aa->aa_oa->o_oi), rc);
1972                 }
1973
1974                 if (rc == 0)
1975                         RETURN(0);
1976                 else if (rc == -EAGAIN || rc == -EINPROGRESS)
1977                         rc = -EIO;
1978         }
1979
1980         if (aa->aa_ocapa) {
1981                 capa_put(aa->aa_ocapa);
1982                 aa->aa_ocapa = NULL;
1983         }
1984
1985         cfs_list_for_each_entry_safe(ext, tmp, &aa->aa_exts, oe_link) {
1986                 if (obj == NULL && rc == 0) {
1987                         obj = osc2cl(ext->oe_obj);
1988                         cl_object_get(obj);
1989                 }
1990
1991                 cfs_list_del_init(&ext->oe_link);
1992                 osc_extent_finish(env, ext, 1, rc);
1993         }
1994         LASSERT(cfs_list_empty(&aa->aa_exts));
1995         LASSERT(cfs_list_empty(&aa->aa_oaps));
1996
1997         if (obj != NULL) {
1998                 struct obdo *oa = aa->aa_oa;
1999                 struct cl_attr *attr  = &osc_env_info(env)->oti_attr;
2000                 unsigned long valid = 0;
2001
2002                 LASSERT(rc == 0);
2003                 if (oa->o_valid & OBD_MD_FLBLOCKS) {
2004                         attr->cat_blocks = oa->o_blocks;
2005                         valid |= CAT_BLOCKS;
2006                 }
2007                 if (oa->o_valid & OBD_MD_FLMTIME) {
2008                         attr->cat_mtime = oa->o_mtime;
2009                         valid |= CAT_MTIME;
2010                 }
2011                 if (oa->o_valid & OBD_MD_FLATIME) {
2012                         attr->cat_atime = oa->o_atime;
2013                         valid |= CAT_ATIME;
2014                 }
2015                 if (oa->o_valid & OBD_MD_FLCTIME) {
2016                         attr->cat_ctime = oa->o_ctime;
2017                         valid |= CAT_CTIME;
2018                 }
2019                 if (valid != 0) {
2020                         cl_object_attr_lock(obj);
2021                         cl_object_attr_set(env, obj, attr, valid);
2022                         cl_object_attr_unlock(obj);
2023                 }
2024                 cl_object_put(env, obj);
2025         }
2026         OBDO_FREE(aa->aa_oa);
2027
2028         cl_req_completion(env, aa->aa_clerq, rc < 0 ? rc :
2029                           req->rq_bulk->bd_nob_transferred);
2030         osc_release_ppga(aa->aa_ppga, aa->aa_page_count);
2031         ptlrpc_lprocfs_brw(req, req->rq_bulk->bd_nob_transferred);
2032
2033         client_obd_list_lock(&cli->cl_loi_list_lock);
2034         /* We need to decrement before osc_ap_completion->osc_wake_cache_waiters
2035          * is called so we know whether to go to sync BRWs or wait for more
2036          * RPCs to complete */
2037         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE)
2038                 cli->cl_w_in_flight--;
2039         else
2040                 cli->cl_r_in_flight--;
2041         osc_wake_cache_waiters(cli);
2042         client_obd_list_unlock(&cli->cl_loi_list_lock);
2043
2044         osc_io_unplug(env, cli, NULL, PDL_POLICY_SAME);
2045         RETURN(rc);
2046 }
2047
2048 static void brw_commit(struct ptlrpc_request *req)
2049 {
2050         spin_lock(&req->rq_lock);
2051         /* If osc_inc_unstable_pages (via osc_extent_finish) races with
2052          * this called via the rq_commit_cb, I need to ensure
2053          * osc_dec_unstable_pages is still called. Otherwise unstable
2054          * pages may be leaked. */
2055         if (req->rq_unstable)
2056                 osc_dec_unstable_pages(req);
2057         else
2058                 req->rq_committed = 1;
2059         spin_unlock(&req->rq_lock);
2060 }
2061
2062 /**
2063  * Build an RPC by the list of extent @ext_list. The caller must ensure
2064  * that the total pages in this list are NOT over max pages per RPC.
2065  * Extents in the list must be in OES_RPC state.
2066  */
2067 int osc_build_rpc(const struct lu_env *env, struct client_obd *cli,
2068                   cfs_list_t *ext_list, int cmd, pdl_policy_t pol)
2069 {
2070         struct ptlrpc_request *req = NULL;
2071         struct osc_extent *ext;
2072         CFS_LIST_HEAD(rpc_list);
2073         struct brw_page **pga = NULL;
2074         struct osc_brw_async_args *aa = NULL;
2075         struct obdo *oa = NULL;
2076         struct osc_async_page *oap;
2077         struct osc_async_page *tmp;
2078         struct cl_req *clerq = NULL;
2079         enum cl_req_type crt = (cmd & OBD_BRW_WRITE) ? CRT_WRITE : CRT_READ;
2080         struct ldlm_lock *lock = NULL;
2081         struct cl_req_attr crattr;
2082         obd_off starting_offset = OBD_OBJECT_EOF;
2083         obd_off ending_offset = 0;
2084         int i, rc, mpflag = 0, mem_tight = 0, page_count = 0;
2085
2086         ENTRY;
2087         LASSERT(!cfs_list_empty(ext_list));
2088
2089         /* add pages into rpc_list to build BRW rpc */
2090         cfs_list_for_each_entry(ext, ext_list, oe_link) {
2091                 LASSERT(ext->oe_state == OES_RPC);
2092                 mem_tight |= ext->oe_memalloc;
2093                 cfs_list_for_each_entry(oap, &ext->oe_pages, oap_pending_item) {
2094                         ++page_count;
2095                         cfs_list_add_tail(&oap->oap_rpc_item, &rpc_list);
2096                         if (starting_offset > oap->oap_obj_off)
2097                                 starting_offset = oap->oap_obj_off;
2098                         else
2099                                 LASSERT(oap->oap_page_off == 0);
2100                         if (ending_offset < oap->oap_obj_off + oap->oap_count)
2101                                 ending_offset = oap->oap_obj_off +
2102                                                 oap->oap_count;
2103                         else
2104                                 LASSERT(oap->oap_page_off + oap->oap_count ==
2105                                         CFS_PAGE_SIZE);
2106                 }
2107         }
2108
2109         if (mem_tight)
2110                 mpflag = cfs_memory_pressure_get_and_set();
2111
2112         memset(&crattr, 0, sizeof crattr);
2113         OBD_ALLOC(pga, sizeof(*pga) * page_count);
2114         if (pga == NULL)
2115                 GOTO(out, rc = -ENOMEM);
2116
2117         OBDO_ALLOC(oa);
2118         if (oa == NULL)
2119                 GOTO(out, rc = -ENOMEM);
2120
2121         i = 0;
2122         cfs_list_for_each_entry(oap, &rpc_list, oap_rpc_item) {
2123                 struct cl_page *page = oap2cl_page(oap);
2124                 if (clerq == NULL) {
2125                         clerq = cl_req_alloc(env, page, crt,
2126                                              1 /* only 1-object rpcs for
2127                                                 * now */);
2128                         if (IS_ERR(clerq))
2129                                 GOTO(out, rc = PTR_ERR(clerq));
2130                         lock = oap->oap_ldlm_lock;
2131                 }
2132                 if (mem_tight)
2133                         oap->oap_brw_flags |= OBD_BRW_MEMALLOC;
2134                 pga[i] = &oap->oap_brw_page;
2135                 pga[i]->off = oap->oap_obj_off + oap->oap_page_off;
2136                 CDEBUG(0, "put page %p index %lu oap %p flg %x to pga\n",
2137                        pga[i]->pg, cfs_page_index(oap->oap_page), oap, pga[i]->flag);
2138                 i++;
2139                 cl_req_page_add(env, clerq, page);
2140         }
2141
2142         /* always get the data for the obdo for the rpc */
2143         LASSERT(clerq != NULL);
2144         crattr.cra_oa = oa;
2145         crattr.cra_capa = NULL;
2146         memset(crattr.cra_jobid, 0, JOBSTATS_JOBID_SIZE);
2147         cl_req_attr_set(env, clerq, &crattr, ~0ULL);
2148         if (lock) {
2149                 oa->o_handle = lock->l_remote_handle;
2150                 oa->o_valid |= OBD_MD_FLHANDLE;
2151         }
2152
2153         rc = cl_req_prep(env, clerq);
2154         if (rc != 0) {
2155                 CERROR("cl_req_prep failed: %d\n", rc);
2156                 GOTO(out, rc);
2157         }
2158
2159         sort_brw_pages(pga, page_count);
2160         rc = osc_brw_prep_request(cmd, cli, oa, NULL, page_count,
2161                         pga, &req, crattr.cra_capa, 1, 0);
2162         if (rc != 0) {
2163                 CERROR("prep_req failed: %d\n", rc);
2164                 GOTO(out, rc);
2165         }
2166
2167         req->rq_commit_cb = brw_commit;
2168         req->rq_interpret_reply = brw_interpret;
2169
2170         if (mem_tight != 0)
2171                 req->rq_memalloc = 1;
2172
2173         /* Need to update the timestamps after the request is built in case
2174          * we race with setattr (locally or in queue at OST).  If OST gets
2175          * later setattr before earlier BRW (as determined by the request xid),
2176          * the OST will not use BRW timestamps.  Sadly, there is no obvious
2177          * way to do this in a single call.  bug 10150 */
2178         cl_req_attr_set(env, clerq, &crattr,
2179                         OBD_MD_FLMTIME|OBD_MD_FLCTIME|OBD_MD_FLATIME);
2180
2181         lustre_msg_set_jobid(req->rq_reqmsg, crattr.cra_jobid);
2182
2183         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
2184         aa = ptlrpc_req_async_args(req);
2185         CFS_INIT_LIST_HEAD(&aa->aa_oaps);
2186         cfs_list_splice_init(&rpc_list, &aa->aa_oaps);
2187         CFS_INIT_LIST_HEAD(&aa->aa_exts);
2188         cfs_list_splice_init(ext_list, &aa->aa_exts);
2189         aa->aa_clerq = clerq;
2190
2191         /* queued sync pages can be torn down while the pages
2192          * were between the pending list and the rpc */
2193         tmp = NULL;
2194         cfs_list_for_each_entry(oap, &aa->aa_oaps, oap_rpc_item) {
2195                 /* only one oap gets a request reference */
2196                 if (tmp == NULL)
2197                         tmp = oap;
2198                 if (oap->oap_interrupted && !req->rq_intr) {
2199                         CDEBUG(D_INODE, "oap %p in req %p interrupted\n",
2200                                         oap, req);
2201                         ptlrpc_mark_interrupted(req);
2202                 }
2203         }
2204         if (tmp != NULL)
2205                 tmp->oap_request = ptlrpc_request_addref(req);
2206
2207         client_obd_list_lock(&cli->cl_loi_list_lock);
2208         starting_offset >>= CFS_PAGE_SHIFT;
2209         if (cmd == OBD_BRW_READ) {
2210                 cli->cl_r_in_flight++;
2211                 lprocfs_oh_tally_log2(&cli->cl_read_page_hist, page_count);
2212                 lprocfs_oh_tally(&cli->cl_read_rpc_hist, cli->cl_r_in_flight);
2213                 lprocfs_oh_tally_log2(&cli->cl_read_offset_hist,
2214                                       starting_offset + 1);
2215         } else {
2216                 cli->cl_w_in_flight++;
2217                 lprocfs_oh_tally_log2(&cli->cl_write_page_hist, page_count);
2218                 lprocfs_oh_tally(&cli->cl_write_rpc_hist, cli->cl_w_in_flight);
2219                 lprocfs_oh_tally_log2(&cli->cl_write_offset_hist,
2220                                       starting_offset + 1);
2221         }
2222         client_obd_list_unlock(&cli->cl_loi_list_lock);
2223
2224         DEBUG_REQ(D_INODE, req, "%d pages, aa %p. now %dr/%dw in flight",
2225                   page_count, aa, cli->cl_r_in_flight,
2226                   cli->cl_w_in_flight);
2227
2228         /* XXX: Maybe the caller can check the RPC bulk descriptor to
2229          * see which CPU/NUMA node the majority of pages were allocated
2230          * on, and try to assign the async RPC to the CPU core
2231          * (PDL_POLICY_PREFERRED) to reduce cross-CPU memory traffic.
2232          *
2233          * But on the other hand, we expect that multiple ptlrpcd
2234          * threads and the initial write sponsor can run in parallel,
2235          * especially when data checksum is enabled, which is CPU-bound
2236          * operation and single ptlrpcd thread cannot process in time.
2237          * So more ptlrpcd threads sharing BRW load
2238          * (with PDL_POLICY_ROUND) seems better.
2239          */
2240         ptlrpcd_add_req(req, pol, -1);
2241         rc = 0;
2242         EXIT;
2243
2244 out:
2245         if (mem_tight != 0)
2246                 cfs_memory_pressure_restore(mpflag);
2247
2248         capa_put(crattr.cra_capa);
2249         if (rc != 0) {
2250                 LASSERT(req == NULL);
2251
2252                 if (oa)
2253                         OBDO_FREE(oa);
2254                 if (pga)
2255                         OBD_FREE(pga, sizeof(*pga) * page_count);
2256                 /* this should happen rarely and is pretty bad, it makes the
2257                  * pending list not follow the dirty order */
2258                 while (!cfs_list_empty(ext_list)) {
2259                         ext = cfs_list_entry(ext_list->next, struct osc_extent,
2260                                              oe_link);
2261                         cfs_list_del_init(&ext->oe_link);
2262                         osc_extent_finish(env, ext, 0, rc);
2263                 }
2264                 if (clerq && !IS_ERR(clerq))
2265                         cl_req_completion(env, clerq, rc);
2266         }
2267         RETURN(rc);
2268 }
2269
2270 static int osc_set_lock_data_with_check(struct ldlm_lock *lock,
2271                                         struct ldlm_enqueue_info *einfo)
2272 {
2273         void *data = einfo->ei_cbdata;
2274         int set = 0;
2275
2276         LASSERT(lock != NULL);
2277         LASSERT(lock->l_blocking_ast == einfo->ei_cb_bl);
2278         LASSERT(lock->l_resource->lr_type == einfo->ei_type);
2279         LASSERT(lock->l_completion_ast == einfo->ei_cb_cp);
2280         LASSERT(lock->l_glimpse_ast == einfo->ei_cb_gl);
2281
2282         lock_res_and_lock(lock);
2283         spin_lock(&osc_ast_guard);
2284
2285         if (lock->l_ast_data == NULL)
2286                 lock->l_ast_data = data;
2287         if (lock->l_ast_data == data)
2288                 set = 1;
2289
2290         spin_unlock(&osc_ast_guard);
2291         unlock_res_and_lock(lock);
2292
2293         return set;
2294 }
2295
2296 static int osc_set_data_with_check(struct lustre_handle *lockh,
2297                                    struct ldlm_enqueue_info *einfo)
2298 {
2299         struct ldlm_lock *lock = ldlm_handle2lock(lockh);
2300         int set = 0;
2301
2302         if (lock != NULL) {
2303                 set = osc_set_lock_data_with_check(lock, einfo);
2304                 LDLM_LOCK_PUT(lock);
2305         } else
2306                 CERROR("lockh %p, data %p - client evicted?\n",
2307                        lockh, einfo->ei_cbdata);
2308         return set;
2309 }
2310
2311 static int osc_change_cbdata(struct obd_export *exp, struct lov_stripe_md *lsm,
2312                              ldlm_iterator_t replace, void *data)
2313 {
2314         struct ldlm_res_id res_id;
2315         struct obd_device *obd = class_exp2obd(exp);
2316
2317         ostid_build_res_name(&lsm->lsm_oi, &res_id);
2318         ldlm_resource_iterate(obd->obd_namespace, &res_id, replace, data);
2319         return 0;
2320 }
2321
2322 /* find any ldlm lock of the inode in osc
2323  * return 0    not find
2324  *        1    find one
2325  *      < 0    error */
2326 static int osc_find_cbdata(struct obd_export *exp, struct lov_stripe_md *lsm,
2327                            ldlm_iterator_t replace, void *data)
2328 {
2329         struct ldlm_res_id res_id;
2330         struct obd_device *obd = class_exp2obd(exp);
2331         int rc = 0;
2332
2333         ostid_build_res_name(&lsm->lsm_oi, &res_id);
2334         rc = ldlm_resource_iterate(obd->obd_namespace, &res_id, replace, data);
2335         if (rc == LDLM_ITER_STOP)
2336                 return(1);
2337         if (rc == LDLM_ITER_CONTINUE)
2338                 return(0);
2339         return(rc);
2340 }
2341
2342 static int osc_enqueue_fini(struct ptlrpc_request *req, struct ost_lvb *lvb,
2343                             obd_enqueue_update_f upcall, void *cookie,
2344                             __u64 *flags, int agl, int rc)
2345 {
2346         int intent = *flags & LDLM_FL_HAS_INTENT;
2347         ENTRY;
2348
2349         if (intent) {
2350                 /* The request was created before ldlm_cli_enqueue call. */
2351                 if (rc == ELDLM_LOCK_ABORTED) {
2352                         struct ldlm_reply *rep;
2353                         rep = req_capsule_server_get(&req->rq_pill,
2354                                                      &RMF_DLM_REP);
2355
2356                         LASSERT(rep != NULL);
2357                         if (rep->lock_policy_res1)
2358                                 rc = rep->lock_policy_res1;
2359                 }
2360         }
2361
2362         if ((intent != 0 && rc == ELDLM_LOCK_ABORTED && agl == 0) ||
2363             (rc == 0)) {
2364                 *flags |= LDLM_FL_LVB_READY;
2365                 CDEBUG(D_INODE,"got kms "LPU64" blocks "LPU64" mtime "LPU64"\n",
2366                        lvb->lvb_size, lvb->lvb_blocks, lvb->lvb_mtime);
2367         }
2368
2369         /* Call the update callback. */
2370         rc = (*upcall)(cookie, rc);
2371         RETURN(rc);
2372 }
2373
2374 static int osc_enqueue_interpret(const struct lu_env *env,
2375                                  struct ptlrpc_request *req,
2376                                  struct osc_enqueue_args *aa, int rc)
2377 {
2378         struct ldlm_lock *lock;
2379         struct lustre_handle handle;
2380         __u32 mode;
2381         struct ost_lvb *lvb;
2382         __u32 lvb_len;
2383         __u64 *flags = aa->oa_flags;
2384
2385         /* Make a local copy of a lock handle and a mode, because aa->oa_*
2386          * might be freed anytime after lock upcall has been called. */
2387         lustre_handle_copy(&handle, aa->oa_lockh);
2388         mode = aa->oa_ei->ei_mode;
2389
2390         /* ldlm_cli_enqueue is holding a reference on the lock, so it must
2391          * be valid. */
2392         lock = ldlm_handle2lock(&handle);
2393
2394         /* Take an additional reference so that a blocking AST that
2395          * ldlm_cli_enqueue_fini() might post for a failed lock, is guaranteed
2396          * to arrive after an upcall has been executed by
2397          * osc_enqueue_fini(). */
2398         ldlm_lock_addref(&handle, mode);
2399
2400         /* Let CP AST to grant the lock first. */
2401         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 1);
2402
2403         if (aa->oa_agl && rc == ELDLM_LOCK_ABORTED) {
2404                 lvb = NULL;
2405                 lvb_len = 0;
2406         } else {
2407                 lvb = aa->oa_lvb;
2408                 lvb_len = sizeof(*aa->oa_lvb);
2409         }
2410
2411         /* Complete obtaining the lock procedure. */
2412         rc = ldlm_cli_enqueue_fini(aa->oa_exp, req, aa->oa_ei->ei_type, 1,
2413                                    mode, flags, lvb, lvb_len, &handle, rc);
2414         /* Complete osc stuff. */
2415         rc = osc_enqueue_fini(req, aa->oa_lvb, aa->oa_upcall, aa->oa_cookie,
2416                               flags, aa->oa_agl, rc);
2417
2418         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_CANCEL_RACE, 10);
2419
2420         /* Release the lock for async request. */
2421         if (lustre_handle_is_used(&handle) && rc == ELDLM_OK)
2422                 /*
2423                  * Releases a reference taken by ldlm_cli_enqueue(), if it is
2424                  * not already released by
2425                  * ldlm_cli_enqueue_fini()->failed_lock_cleanup()
2426                  */
2427                 ldlm_lock_decref(&handle, mode);
2428
2429         LASSERTF(lock != NULL, "lockh %p, req %p, aa %p - client evicted?\n",
2430                  aa->oa_lockh, req, aa);
2431         ldlm_lock_decref(&handle, mode);
2432         LDLM_LOCK_PUT(lock);
2433         return rc;
2434 }
2435
2436 void osc_update_enqueue(struct lustre_handle *lov_lockhp,
2437                         struct lov_oinfo *loi, int flags,
2438                         struct ost_lvb *lvb, __u32 mode, int rc)
2439 {
2440         struct ldlm_lock *lock = ldlm_handle2lock(lov_lockhp);
2441
2442         if (rc == ELDLM_OK) {
2443                 __u64 tmp;
2444
2445                 LASSERT(lock != NULL);
2446                 loi->loi_lvb = *lvb;
2447                 tmp = loi->loi_lvb.lvb_size;
2448                 /* Extend KMS up to the end of this lock and no further
2449                  * A lock on [x,y] means a KMS of up to y + 1 bytes! */
2450                 if (tmp > lock->l_policy_data.l_extent.end)
2451                         tmp = lock->l_policy_data.l_extent.end + 1;
2452                 if (tmp >= loi->loi_kms) {
2453                         LDLM_DEBUG(lock, "lock acquired, setting rss="LPU64
2454                                    ", kms="LPU64, loi->loi_lvb.lvb_size, tmp);
2455                         loi_kms_set(loi, tmp);
2456                 } else {
2457                         LDLM_DEBUG(lock, "lock acquired, setting rss="
2458                                    LPU64"; leaving kms="LPU64", end="LPU64,
2459                                    loi->loi_lvb.lvb_size, loi->loi_kms,
2460                                    lock->l_policy_data.l_extent.end);
2461                 }
2462                 ldlm_lock_allow_match(lock);
2463         } else if (rc == ELDLM_LOCK_ABORTED && (flags & LDLM_FL_HAS_INTENT)) {
2464                 LASSERT(lock != NULL);
2465                 loi->loi_lvb = *lvb;
2466                 ldlm_lock_allow_match(lock);
2467                 CDEBUG(D_INODE, "glimpsed, setting rss="LPU64"; leaving"
2468                        " kms="LPU64"\n", loi->loi_lvb.lvb_size, loi->loi_kms);
2469                 rc = ELDLM_OK;
2470         }
2471
2472         if (lock != NULL) {
2473                 if (rc != ELDLM_OK)
2474                         ldlm_lock_fail_match(lock);
2475
2476                 LDLM_LOCK_PUT(lock);
2477         }
2478 }
2479 EXPORT_SYMBOL(osc_update_enqueue);
2480
2481 struct ptlrpc_request_set *PTLRPCD_SET = (void *)1;
2482
2483 /* When enqueuing asynchronously, locks are not ordered, we can obtain a lock
2484  * from the 2nd OSC before a lock from the 1st one. This does not deadlock with
2485  * other synchronous requests, however keeping some locks and trying to obtain
2486  * others may take a considerable amount of time in a case of ost failure; and
2487  * when other sync requests do not get released lock from a client, the client
2488  * is excluded from the cluster -- such scenarious make the life difficult, so
2489  * release locks just after they are obtained. */
2490 int osc_enqueue_base(struct obd_export *exp, struct ldlm_res_id *res_id,
2491                      __u64 *flags, ldlm_policy_data_t *policy,
2492                      struct ost_lvb *lvb, int kms_valid,
2493                      obd_enqueue_update_f upcall, void *cookie,
2494                      struct ldlm_enqueue_info *einfo,
2495                      struct lustre_handle *lockh,
2496                      struct ptlrpc_request_set *rqset, int async, int agl)
2497 {
2498         struct obd_device *obd = exp->exp_obd;
2499         struct ptlrpc_request *req = NULL;
2500         int intent = *flags & LDLM_FL_HAS_INTENT;
2501         int match_lvb = (agl != 0 ? 0 : LDLM_FL_LVB_READY);
2502         ldlm_mode_t mode;
2503         int rc;
2504         ENTRY;
2505
2506         /* Filesystem lock extents are extended to page boundaries so that
2507          * dealing with the page cache is a little smoother.  */
2508         policy->l_extent.start -= policy->l_extent.start & ~CFS_PAGE_MASK;
2509         policy->l_extent.end |= ~CFS_PAGE_MASK;
2510
2511         /*
2512          * kms is not valid when either object is completely fresh (so that no
2513          * locks are cached), or object was evicted. In the latter case cached
2514          * lock cannot be used, because it would prime inode state with
2515          * potentially stale LVB.
2516          */
2517         if (!kms_valid)
2518                 goto no_match;
2519
2520         /* Next, search for already existing extent locks that will cover us */
2521         /* If we're trying to read, we also search for an existing PW lock.  The
2522          * VFS and page cache already protect us locally, so lots of readers/
2523          * writers can share a single PW lock.
2524          *
2525          * There are problems with conversion deadlocks, so instead of
2526          * converting a read lock to a write lock, we'll just enqueue a new
2527          * one.
2528          *
2529          * At some point we should cancel the read lock instead of making them
2530          * send us a blocking callback, but there are problems with canceling
2531          * locks out from other users right now, too. */
2532         mode = einfo->ei_mode;
2533         if (einfo->ei_mode == LCK_PR)
2534                 mode |= LCK_PW;
2535         mode = ldlm_lock_match(obd->obd_namespace, *flags | match_lvb, res_id,
2536                                einfo->ei_type, policy, mode, lockh, 0);
2537         if (mode) {
2538                 struct ldlm_lock *matched = ldlm_handle2lock(lockh);
2539
2540                 if ((agl != 0) && !(matched->l_flags & LDLM_FL_LVB_READY)) {
2541                         /* For AGL, if enqueue RPC is sent but the lock is not
2542                          * granted, then skip to process this strpe.
2543                          * Return -ECANCELED to tell the caller. */
2544                         ldlm_lock_decref(lockh, mode);
2545                         LDLM_LOCK_PUT(matched);
2546                         RETURN(-ECANCELED);
2547                 } else if (osc_set_lock_data_with_check(matched, einfo)) {
2548                         *flags |= LDLM_FL_LVB_READY;
2549                         /* addref the lock only if not async requests and PW
2550                          * lock is matched whereas we asked for PR. */
2551                         if (!rqset && einfo->ei_mode != mode)
2552                                 ldlm_lock_addref(lockh, LCK_PR);
2553                         if (intent) {
2554                                 /* I would like to be able to ASSERT here that
2555                                  * rss <= kms, but I can't, for reasons which
2556                                  * are explained in lov_enqueue() */
2557                         }
2558
2559                         /* We already have a lock, and it's referenced.
2560                          *
2561                          * At this point, the cl_lock::cll_state is CLS_QUEUING,
2562                          * AGL upcall may change it to CLS_HELD directly. */
2563                         (*upcall)(cookie, ELDLM_OK);
2564
2565                         if (einfo->ei_mode != mode)
2566                                 ldlm_lock_decref(lockh, LCK_PW);
2567                         else if (rqset)
2568                                 /* For async requests, decref the lock. */
2569                                 ldlm_lock_decref(lockh, einfo->ei_mode);
2570                         LDLM_LOCK_PUT(matched);
2571                         RETURN(ELDLM_OK);
2572                 } else {
2573                         ldlm_lock_decref(lockh, mode);
2574                         LDLM_LOCK_PUT(matched);
2575                 }
2576         }
2577
2578  no_match:
2579         if (intent) {
2580                 CFS_LIST_HEAD(cancels);
2581                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
2582                                            &RQF_LDLM_ENQUEUE_LVB);
2583                 if (req == NULL)
2584                         RETURN(-ENOMEM);
2585
2586                 rc = ldlm_prep_enqueue_req(exp, req, &cancels, 0);
2587                 if (rc) {
2588                         ptlrpc_request_free(req);
2589                         RETURN(rc);
2590                 }
2591
2592                 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
2593                                      sizeof *lvb);
2594                 ptlrpc_request_set_replen(req);
2595         }
2596
2597         /* users of osc_enqueue() can pass this flag for ldlm_lock_match() */
2598         *flags &= ~LDLM_FL_BLOCK_GRANTED;
2599
2600         rc = ldlm_cli_enqueue(exp, &req, einfo, res_id, policy, flags, lvb,
2601                               sizeof(*lvb), LVB_T_OST, lockh, async);
2602         if (rqset) {
2603                 if (!rc) {
2604                         struct osc_enqueue_args *aa;
2605                         CLASSERT (sizeof(*aa) <= sizeof(req->rq_async_args));
2606                         aa = ptlrpc_req_async_args(req);
2607                         aa->oa_ei = einfo;
2608                         aa->oa_exp = exp;
2609                         aa->oa_flags  = flags;
2610                         aa->oa_upcall = upcall;
2611                         aa->oa_cookie = cookie;
2612                         aa->oa_lvb    = lvb;
2613                         aa->oa_lockh  = lockh;
2614                         aa->oa_agl    = !!agl;
2615
2616                         req->rq_interpret_reply =
2617                                 (ptlrpc_interpterer_t)osc_enqueue_interpret;
2618                         if (rqset == PTLRPCD_SET)
2619                                 ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
2620                         else
2621                                 ptlrpc_set_add_req(rqset, req);
2622                 } else if (intent) {
2623                         ptlrpc_req_finished(req);
2624                 }
2625                 RETURN(rc);
2626         }
2627
2628         rc = osc_enqueue_fini(req, lvb, upcall, cookie, flags, agl, rc);
2629         if (intent)
2630                 ptlrpc_req_finished(req);
2631
2632         RETURN(rc);
2633 }
2634
2635 static int osc_enqueue(struct obd_export *exp, struct obd_info *oinfo,
2636                        struct ldlm_enqueue_info *einfo,
2637                        struct ptlrpc_request_set *rqset)
2638 {
2639         struct ldlm_res_id res_id;
2640         int rc;
2641         ENTRY;
2642
2643         ostid_build_res_name(&oinfo->oi_md->lsm_oi, &res_id);
2644         rc = osc_enqueue_base(exp, &res_id, &oinfo->oi_flags, &oinfo->oi_policy,
2645                               &oinfo->oi_md->lsm_oinfo[0]->loi_lvb,
2646                               oinfo->oi_md->lsm_oinfo[0]->loi_kms_valid,
2647                               oinfo->oi_cb_up, oinfo, einfo, oinfo->oi_lockh,
2648                               rqset, rqset != NULL, 0);
2649         RETURN(rc);
2650 }
2651
2652 int osc_match_base(struct obd_export *exp, struct ldlm_res_id *res_id,
2653                    __u32 type, ldlm_policy_data_t *policy, __u32 mode,
2654                    int *flags, void *data, struct lustre_handle *lockh,
2655                    int unref)
2656 {
2657         struct obd_device *obd = exp->exp_obd;
2658         int lflags = *flags;
2659         ldlm_mode_t rc;
2660         ENTRY;
2661
2662         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_MATCH))
2663                 RETURN(-EIO);
2664
2665         /* Filesystem lock extents are extended to page boundaries so that
2666          * dealing with the page cache is a little smoother */
2667         policy->l_extent.start -= policy->l_extent.start & ~CFS_PAGE_MASK;
2668         policy->l_extent.end |= ~CFS_PAGE_MASK;
2669
2670         /* Next, search for already existing extent locks that will cover us */
2671         /* If we're trying to read, we also search for an existing PW lock.  The
2672          * VFS and page cache already protect us locally, so lots of readers/
2673          * writers can share a single PW lock. */
2674         rc = mode;
2675         if (mode == LCK_PR)
2676                 rc |= LCK_PW;
2677         rc = ldlm_lock_match(obd->obd_namespace, lflags,
2678                              res_id, type, policy, rc, lockh, unref);
2679         if (rc) {
2680                 if (data != NULL) {
2681                         if (!osc_set_data_with_check(lockh, data)) {
2682                                 if (!(lflags & LDLM_FL_TEST_LOCK))
2683                                         ldlm_lock_decref(lockh, rc);
2684                                 RETURN(0);
2685                         }
2686                 }
2687                 if (!(lflags & LDLM_FL_TEST_LOCK) && mode != rc) {
2688                         ldlm_lock_addref(lockh, LCK_PR);
2689                         ldlm_lock_decref(lockh, LCK_PW);
2690                 }
2691                 RETURN(rc);
2692         }
2693         RETURN(rc);
2694 }
2695
2696 int osc_cancel_base(struct lustre_handle *lockh, __u32 mode)
2697 {
2698         ENTRY;
2699
2700         if (unlikely(mode == LCK_GROUP))
2701                 ldlm_lock_decref_and_cancel(lockh, mode);
2702         else
2703                 ldlm_lock_decref(lockh, mode);
2704
2705         RETURN(0);
2706 }
2707
2708 static int osc_cancel(struct obd_export *exp, struct lov_stripe_md *md,
2709                       __u32 mode, struct lustre_handle *lockh)
2710 {
2711         ENTRY;
2712         RETURN(osc_cancel_base(lockh, mode));
2713 }
2714
2715 static int osc_cancel_unused(struct obd_export *exp,
2716                              struct lov_stripe_md *lsm,
2717                              ldlm_cancel_flags_t flags,
2718                              void *opaque)
2719 {
2720         struct obd_device *obd = class_exp2obd(exp);
2721         struct ldlm_res_id res_id, *resp = NULL;
2722
2723         if (lsm != NULL) {
2724                 ostid_build_res_name(&lsm->lsm_oi, &res_id);
2725                 resp = &res_id;
2726         }
2727
2728         return ldlm_cli_cancel_unused(obd->obd_namespace, resp, flags, opaque);
2729 }
2730
2731 static int osc_statfs_interpret(const struct lu_env *env,
2732                                 struct ptlrpc_request *req,
2733                                 struct osc_async_args *aa, int rc)
2734 {
2735         struct obd_statfs *msfs;
2736         ENTRY;
2737
2738         if (rc == -EBADR)
2739                 /* The request has in fact never been sent
2740                  * due to issues at a higher level (LOV).
2741                  * Exit immediately since the caller is
2742                  * aware of the problem and takes care
2743                  * of the clean up */
2744                  RETURN(rc);
2745
2746         if ((rc == -ENOTCONN || rc == -EAGAIN) &&
2747             (aa->aa_oi->oi_flags & OBD_STATFS_NODELAY))
2748                 GOTO(out, rc = 0);
2749
2750         if (rc != 0)
2751                 GOTO(out, rc);
2752
2753         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
2754         if (msfs == NULL) {
2755                 GOTO(out, rc = -EPROTO);
2756         }
2757
2758         *aa->aa_oi->oi_osfs = *msfs;
2759 out:
2760         rc = aa->aa_oi->oi_cb_up(aa->aa_oi, rc);
2761         RETURN(rc);
2762 }
2763
2764 static int osc_statfs_async(struct obd_export *exp,
2765                             struct obd_info *oinfo, __u64 max_age,
2766                             struct ptlrpc_request_set *rqset)
2767 {
2768         struct obd_device     *obd = class_exp2obd(exp);
2769         struct ptlrpc_request *req;
2770         struct osc_async_args *aa;
2771         int                    rc;
2772         ENTRY;
2773
2774         /* We could possibly pass max_age in the request (as an absolute
2775          * timestamp or a "seconds.usec ago") so the target can avoid doing
2776          * extra calls into the filesystem if that isn't necessary (e.g.
2777          * during mount that would help a bit).  Having relative timestamps
2778          * is not so great if request processing is slow, while absolute
2779          * timestamps are not ideal because they need time synchronization. */
2780         req = ptlrpc_request_alloc(obd->u.cli.cl_import, &RQF_OST_STATFS);
2781         if (req == NULL)
2782                 RETURN(-ENOMEM);
2783
2784         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
2785         if (rc) {
2786                 ptlrpc_request_free(req);
2787                 RETURN(rc);
2788         }
2789         ptlrpc_request_set_replen(req);
2790         req->rq_request_portal = OST_CREATE_PORTAL;
2791         ptlrpc_at_set_req_timeout(req);
2792
2793         if (oinfo->oi_flags & OBD_STATFS_NODELAY) {
2794                 /* procfs requests not want stat in wait for avoid deadlock */
2795                 req->rq_no_resend = 1;
2796                 req->rq_no_delay = 1;
2797         }
2798
2799         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_statfs_interpret;
2800         CLASSERT (sizeof(*aa) <= sizeof(req->rq_async_args));
2801         aa = ptlrpc_req_async_args(req);
2802         aa->aa_oi = oinfo;
2803
2804         ptlrpc_set_add_req(rqset, req);
2805         RETURN(0);
2806 }
2807
2808 static int osc_statfs(const struct lu_env *env, struct obd_export *exp,
2809                       struct obd_statfs *osfs, __u64 max_age, __u32 flags)
2810 {
2811         struct obd_device     *obd = class_exp2obd(exp);
2812         struct obd_statfs     *msfs;
2813         struct ptlrpc_request *req;
2814         struct obd_import     *imp = NULL;
2815         int rc;
2816         ENTRY;
2817
2818         /*Since the request might also come from lprocfs, so we need
2819          *sync this with client_disconnect_export Bug15684*/
2820         down_read(&obd->u.cli.cl_sem);
2821         if (obd->u.cli.cl_import)
2822                 imp = class_import_get(obd->u.cli.cl_import);
2823         up_read(&obd->u.cli.cl_sem);
2824         if (!imp)
2825                 RETURN(-ENODEV);
2826
2827         /* We could possibly pass max_age in the request (as an absolute
2828          * timestamp or a "seconds.usec ago") so the target can avoid doing
2829          * extra calls into the filesystem if that isn't necessary (e.g.
2830          * during mount that would help a bit).  Having relative timestamps
2831          * is not so great if request processing is slow, while absolute
2832          * timestamps are not ideal because they need time synchronization. */
2833         req = ptlrpc_request_alloc(imp, &RQF_OST_STATFS);
2834
2835         class_import_put(imp);
2836
2837         if (req == NULL)
2838                 RETURN(-ENOMEM);
2839
2840         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
2841         if (rc) {
2842                 ptlrpc_request_free(req);
2843                 RETURN(rc);
2844         }
2845         ptlrpc_request_set_replen(req);
2846         req->rq_request_portal = OST_CREATE_PORTAL;
2847         ptlrpc_at_set_req_timeout(req);
2848
2849         if (flags & OBD_STATFS_NODELAY) {
2850                 /* procfs requests not want stat in wait for avoid deadlock */
2851                 req->rq_no_resend = 1;
2852                 req->rq_no_delay = 1;
2853         }
2854
2855         rc = ptlrpc_queue_wait(req);
2856         if (rc)
2857                 GOTO(out, rc);
2858
2859         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
2860         if (msfs == NULL) {
2861                 GOTO(out, rc = -EPROTO);
2862         }
2863
2864         *osfs = *msfs;
2865
2866         EXIT;
2867  out:
2868         ptlrpc_req_finished(req);
2869         return rc;
2870 }
2871
2872 /* Retrieve object striping information.
2873  *
2874  * @lmmu is a pointer to an in-core struct with lmm_ost_count indicating
2875  * the maximum number of OST indices which will fit in the user buffer.
2876  * lmm_magic must be LOV_MAGIC (we only use 1 slot here).
2877  */
2878 static int osc_getstripe(struct lov_stripe_md *lsm, struct lov_user_md *lump)
2879 {
2880         /* we use lov_user_md_v3 because it is larger than lov_user_md_v1 */
2881         struct lov_user_md_v3 lum, *lumk;
2882         struct lov_user_ost_data_v1 *lmm_objects;
2883         int rc = 0, lum_size;
2884         ENTRY;
2885
2886         if (!lsm)
2887                 RETURN(-ENODATA);
2888
2889         /* we only need the header part from user space to get lmm_magic and
2890          * lmm_stripe_count, (the header part is common to v1 and v3) */
2891         lum_size = sizeof(struct lov_user_md_v1);
2892         if (cfs_copy_from_user(&lum, lump, lum_size))
2893                 RETURN(-EFAULT);
2894
2895         if ((lum.lmm_magic != LOV_USER_MAGIC_V1) &&
2896             (lum.lmm_magic != LOV_USER_MAGIC_V3))
2897                 RETURN(-EINVAL);
2898
2899         /* lov_user_md_vX and lov_mds_md_vX must have the same size */
2900         LASSERT(sizeof(struct lov_user_md_v1) == sizeof(struct lov_mds_md_v1));
2901         LASSERT(sizeof(struct lov_user_md_v3) == sizeof(struct lov_mds_md_v3));
2902         LASSERT(sizeof(lum.lmm_objects[0]) == sizeof(lumk->lmm_objects[0]));
2903
2904         /* we can use lov_mds_md_size() to compute lum_size
2905          * because lov_user_md_vX and lov_mds_md_vX have the same size */
2906         if (lum.lmm_stripe_count > 0) {
2907                 lum_size = lov_mds_md_size(lum.lmm_stripe_count, lum.lmm_magic);
2908                 OBD_ALLOC(lumk, lum_size);
2909                 if (!lumk)
2910                         RETURN(-ENOMEM);
2911
2912                 if (lum.lmm_magic == LOV_USER_MAGIC_V1)
2913                         lmm_objects =
2914                             &(((struct lov_user_md_v1 *)lumk)->lmm_objects[0]);
2915                 else
2916                         lmm_objects = &(lumk->lmm_objects[0]);
2917                 lmm_objects->l_ost_oi = lsm->lsm_oi;
2918         } else {
2919                 lum_size = lov_mds_md_size(0, lum.lmm_magic);
2920                 lumk = &lum;
2921         }
2922
2923         lumk->lmm_oi = lsm->lsm_oi;
2924         lumk->lmm_stripe_count = 1;
2925
2926         if (cfs_copy_to_user(lump, lumk, lum_size))
2927                 rc = -EFAULT;
2928
2929         if (lumk != &lum)
2930                 OBD_FREE(lumk, lum_size);
2931
2932         RETURN(rc);
2933 }
2934
2935
2936 static int osc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
2937                          void *karg, void *uarg)
2938 {
2939         struct obd_device *obd = exp->exp_obd;
2940         struct obd_ioctl_data *data = karg;
2941         int err = 0;
2942         ENTRY;
2943
2944         if (!cfs_try_module_get(THIS_MODULE)) {
2945                 CERROR("Can't get module. Is it alive?");
2946                 return -EINVAL;
2947         }
2948         switch (cmd) {
2949         case OBD_IOC_LOV_GET_CONFIG: {
2950                 char *buf;
2951                 struct lov_desc *desc;
2952                 struct obd_uuid uuid;
2953
2954                 buf = NULL;
2955                 len = 0;
2956                 if (obd_ioctl_getdata(&buf, &len, (void *)uarg))
2957                         GOTO(out, err = -EINVAL);
2958
2959                 data = (struct obd_ioctl_data *)buf;
2960
2961                 if (sizeof(*desc) > data->ioc_inllen1) {
2962                         obd_ioctl_freedata(buf, len);
2963                         GOTO(out, err = -EINVAL);
2964                 }
2965
2966                 if (data->ioc_inllen2 < sizeof(uuid)) {
2967                         obd_ioctl_freedata(buf, len);
2968                         GOTO(out, err = -EINVAL);
2969                 }
2970
2971                 desc = (struct lov_desc *)data->ioc_inlbuf1;
2972                 desc->ld_tgt_count = 1;
2973                 desc->ld_active_tgt_count = 1;
2974                 desc->ld_default_stripe_count = 1;
2975                 desc->ld_default_stripe_size = 0;
2976                 desc->ld_default_stripe_offset = 0;
2977                 desc->ld_pattern = 0;
2978                 memcpy(&desc->ld_uuid, &obd->obd_uuid, sizeof(uuid));
2979
2980                 memcpy(data->ioc_inlbuf2, &obd->obd_uuid, sizeof(uuid));
2981
2982                 err = cfs_copy_to_user((void *)uarg, buf, len);
2983                 if (err)
2984                         err = -EFAULT;
2985                 obd_ioctl_freedata(buf, len);
2986                 GOTO(out, err);
2987         }
2988         case LL_IOC_LOV_SETSTRIPE:
2989                 err = obd_alloc_memmd(exp, karg);
2990                 if (err > 0)
2991                         err = 0;
2992                 GOTO(out, err);
2993         case LL_IOC_LOV_GETSTRIPE:
2994                 err = osc_getstripe(karg, uarg);
2995                 GOTO(out, err);
2996         case OBD_IOC_CLIENT_RECOVER:
2997                 err = ptlrpc_recover_import(obd->u.cli.cl_import,
2998                                             data->ioc_inlbuf1, 0);
2999                 if (err > 0)
3000                         err = 0;
3001                 GOTO(out, err);
3002         case IOC_OSC_SET_ACTIVE:
3003                 err = ptlrpc_set_import_active(obd->u.cli.cl_import,
3004                                                data->ioc_offset);
3005                 GOTO(out, err);
3006         case OBD_IOC_POLL_QUOTACHECK:
3007                 err = osc_quota_poll_check(exp, (struct if_quotacheck *)karg);
3008                 GOTO(out, err);
3009         case OBD_IOC_PING_TARGET:
3010                 err = ptlrpc_obd_ping(obd);
3011                 GOTO(out, err);
3012         default:
3013                 CDEBUG(D_INODE, "unrecognised ioctl %#x by %s\n",
3014                        cmd, cfs_curproc_comm());
3015                 GOTO(out, err = -ENOTTY);
3016         }
3017 out:
3018         cfs_module_put(THIS_MODULE);
3019         return err;
3020 }
3021
3022 static int osc_get_info(const struct lu_env *env, struct obd_export *exp,
3023                         obd_count keylen, void *key, __u32 *vallen, void *val,
3024                         struct lov_stripe_md *lsm)
3025 {
3026         ENTRY;
3027         if (!vallen || !val)
3028                 RETURN(-EFAULT);
3029
3030         if (KEY_IS(KEY_LOCK_TO_STRIPE)) {
3031                 __u32 *stripe = val;
3032                 *vallen = sizeof(*stripe);
3033                 *stripe = 0;
3034                 RETURN(0);
3035         } else if (KEY_IS(KEY_LAST_ID)) {
3036                 struct ptlrpc_request *req;
3037                 obd_id                *reply;
3038                 char                  *tmp;
3039                 int                    rc;
3040
3041                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
3042                                            &RQF_OST_GET_INFO_LAST_ID);
3043                 if (req == NULL)
3044                         RETURN(-ENOMEM);
3045
3046                 req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
3047                                      RCL_CLIENT, keylen);
3048                 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
3049                 if (rc) {
3050                         ptlrpc_request_free(req);
3051                         RETURN(rc);
3052                 }
3053
3054                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
3055                 memcpy(tmp, key, keylen);
3056
3057                 req->rq_no_delay = req->rq_no_resend = 1;
3058                 ptlrpc_request_set_replen(req);
3059                 rc = ptlrpc_queue_wait(req);
3060                 if (rc)
3061                         GOTO(out, rc);
3062
3063                 reply = req_capsule_server_get(&req->rq_pill, &RMF_OBD_ID);
3064                 if (reply == NULL)
3065                         GOTO(out, rc = -EPROTO);
3066
3067                 *((obd_id *)val) = *reply;
3068         out:
3069                 ptlrpc_req_finished(req);
3070                 RETURN(rc);
3071         } else if (KEY_IS(KEY_FIEMAP)) {
3072                 struct ptlrpc_request *req;
3073                 struct ll_user_fiemap *reply;
3074                 char *tmp;
3075                 int rc;
3076
3077                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
3078                                            &RQF_OST_GET_INFO_FIEMAP);
3079                 if (req == NULL)
3080                         RETURN(-ENOMEM);
3081
3082                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_KEY,
3083                                      RCL_CLIENT, keylen);
3084                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_VAL,
3085                                      RCL_CLIENT, *vallen);
3086                 req_capsule_set_size(&req->rq_pill, &RMF_FIEMAP_VAL,
3087                                      RCL_SERVER, *vallen);
3088
3089                 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GET_INFO);
3090                 if (rc) {
3091                         ptlrpc_request_free(req);
3092                         RETURN(rc);
3093                 }
3094
3095                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_FIEMAP_KEY);
3096                 memcpy(tmp, key, keylen);
3097                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_FIEMAP_VAL);
3098                 memcpy(tmp, val, *vallen);
3099
3100                 ptlrpc_request_set_replen(req);
3101                 rc = ptlrpc_queue_wait(req);
3102                 if (rc)
3103                         GOTO(out1, rc);
3104
3105                 reply = req_capsule_server_get(&req->rq_pill, &RMF_FIEMAP_VAL);
3106                 if (reply == NULL)
3107                         GOTO(out1, rc = -EPROTO);
3108
3109                 memcpy(val, reply, *vallen);
3110         out1:
3111                 ptlrpc_req_finished(req);
3112
3113                 RETURN(rc);
3114         }
3115
3116         RETURN(-EINVAL);
3117 }
3118
3119 static int osc_set_info_async(const struct lu_env *env, struct obd_export *exp,
3120                               obd_count keylen, void *key, obd_count vallen,
3121                               void *val, struct ptlrpc_request_set *set)
3122 {
3123         struct ptlrpc_request *req;
3124         struct obd_device     *obd = exp->exp_obd;
3125         struct obd_import     *imp = class_exp2cliimp(exp);
3126         char                  *tmp;
3127         int                    rc;
3128         ENTRY;
3129
3130         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_SHUTDOWN, 10);
3131
3132         if (KEY_IS(KEY_CHECKSUM)) {
3133                 if (vallen != sizeof(int))
3134                         RETURN(-EINVAL);
3135                 exp->exp_obd->u.cli.cl_checksum = (*(int *)val) ? 1 : 0;
3136                 RETURN(0);
3137         }
3138
3139         if (KEY_IS(KEY_SPTLRPC_CONF)) {
3140                 sptlrpc_conf_client_adapt(obd);
3141                 RETURN(0);
3142         }
3143
3144         if (KEY_IS(KEY_FLUSH_CTX)) {
3145                 sptlrpc_import_flush_my_ctx(imp);
3146                 RETURN(0);
3147         }
3148
3149         if (KEY_IS(KEY_CACHE_SET)) {
3150                 struct client_obd *cli = &obd->u.cli;
3151
3152                 LASSERT(cli->cl_cache == NULL); /* only once */
3153                 cli->cl_cache = (struct cl_client_cache *)val;
3154                 cfs_atomic_inc(&cli->cl_cache->ccc_users);
3155                 cli->cl_lru_left = &cli->cl_cache->ccc_lru_left;
3156
3157                 /* add this osc into entity list */
3158                 LASSERT(cfs_list_empty(&cli->cl_lru_osc));
3159                 spin_lock(&cli->cl_cache->ccc_lru_lock);
3160                 cfs_list_add(&cli->cl_lru_osc, &cli->cl_cache->ccc_lru);
3161                 spin_unlock(&cli->cl_cache->ccc_lru_lock);
3162
3163                 RETURN(0);
3164         }
3165
3166         if (KEY_IS(KEY_CACHE_LRU_SHRINK)) {
3167                 struct client_obd *cli = &obd->u.cli;
3168                 int nr = cfs_atomic_read(&cli->cl_lru_in_list) >> 1;
3169                 int target = *(int *)val;
3170
3171                 nr = osc_lru_shrink(cli, min(nr, target));
3172                 *(int *)val -= nr;
3173                 RETURN(0);
3174         }
3175
3176         if (!set && !KEY_IS(KEY_GRANT_SHRINK))
3177                 RETURN(-EINVAL);
3178
3179         /* We pass all other commands directly to OST. Since nobody calls osc
3180            methods directly and everybody is supposed to go through LOV, we
3181            assume lov checked invalid values for us.
3182            The only recognised values so far are evict_by_nid and mds_conn.
3183            Even if something bad goes through, we'd get a -EINVAL from OST
3184            anyway. */
3185
3186         req = ptlrpc_request_alloc(imp, KEY_IS(KEY_GRANT_SHRINK) ?
3187                                                 &RQF_OST_SET_GRANT_INFO :
3188                                                 &RQF_OBD_SET_INFO);
3189         if (req == NULL)
3190                 RETURN(-ENOMEM);
3191
3192         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
3193                              RCL_CLIENT, keylen);
3194         if (!KEY_IS(KEY_GRANT_SHRINK))
3195                 req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_VAL,
3196                                      RCL_CLIENT, vallen);
3197         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SET_INFO);
3198         if (rc) {
3199                 ptlrpc_request_free(req);
3200                 RETURN(rc);
3201         }
3202
3203         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
3204         memcpy(tmp, key, keylen);
3205         tmp = req_capsule_client_get(&req->rq_pill, KEY_IS(KEY_GRANT_SHRINK) ?
3206                                                         &RMF_OST_BODY :
3207                                                         &RMF_SETINFO_VAL);
3208         memcpy(tmp, val, vallen);
3209
3210         if (KEY_IS(KEY_GRANT_SHRINK)) {
3211                 struct osc_grant_args *aa;
3212                 struct obdo *oa;
3213
3214                 CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
3215                 aa = ptlrpc_req_async_args(req);
3216                 OBDO_ALLOC(oa);
3217                 if (!oa) {
3218                         ptlrpc_req_finished(req);
3219                         RETURN(-ENOMEM);
3220                 }
3221                 *oa = ((struct ost_body *)val)->oa;
3222                 aa->aa_oa = oa;
3223                 req->rq_interpret_reply = osc_shrink_grant_interpret;
3224         }
3225
3226         ptlrpc_request_set_replen(req);
3227         if (!KEY_IS(KEY_GRANT_SHRINK)) {
3228                 LASSERT(set != NULL);
3229                 ptlrpc_set_add_req(set, req);
3230                 ptlrpc_check_set(NULL, set);
3231         } else
3232                 ptlrpcd_add_req(req, PDL_POLICY_ROUND, -1);
3233
3234         RETURN(0);
3235 }
3236
3237
3238 static int osc_llog_init(struct obd_device *obd, struct obd_llog_group *olg,
3239                          struct obd_device *disk_obd, int *index)
3240 {
3241         /* this code is not supposed to be used with LOD/OSP
3242          * to be removed soon */
3243         LBUG();
3244         return 0;
3245 }
3246
3247 static int osc_llog_finish(struct obd_device *obd, int count)
3248 {
3249         struct llog_ctxt *ctxt;
3250
3251         ENTRY;
3252
3253         ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
3254         if (ctxt) {
3255                 llog_cat_close(NULL, ctxt->loc_handle);
3256                 llog_cleanup(NULL, ctxt);
3257         }
3258
3259         ctxt = llog_get_context(obd, LLOG_SIZE_REPL_CTXT);
3260         if (ctxt)
3261                 llog_cleanup(NULL, ctxt);
3262         RETURN(0);
3263 }
3264
3265 static int osc_reconnect(const struct lu_env *env,
3266                          struct obd_export *exp, struct obd_device *obd,
3267                          struct obd_uuid *cluuid,
3268                          struct obd_connect_data *data,
3269                          void *localdata)
3270 {
3271         struct client_obd *cli = &obd->u.cli;
3272
3273         if (data != NULL && (data->ocd_connect_flags & OBD_CONNECT_GRANT)) {
3274                 long lost_grant;
3275
3276                 client_obd_list_lock(&cli->cl_loi_list_lock);
3277                 data->ocd_grant = (cli->cl_avail_grant + cli->cl_dirty) ?:
3278                                 2 * cli_brw_size(obd);
3279                 lost_grant = cli->cl_lost_grant;
3280                 cli->cl_lost_grant = 0;
3281                 client_obd_list_unlock(&cli->cl_loi_list_lock);
3282
3283                 CDEBUG(D_RPCTRACE, "ocd_connect_flags: "LPX64" ocd_version: %d"
3284                        " ocd_grant: %d, lost: %ld.\n", data->ocd_connect_flags,
3285                        data->ocd_version, data->ocd_grant, lost_grant);
3286         }
3287
3288         RETURN(0);
3289 }
3290
3291 static int osc_disconnect(struct obd_export *exp)
3292 {
3293         struct obd_device *obd = class_exp2obd(exp);
3294         struct llog_ctxt  *ctxt;
3295         int rc;
3296
3297         ctxt = llog_get_context(obd, LLOG_SIZE_REPL_CTXT);
3298         if (ctxt) {
3299                 if (obd->u.cli.cl_conn_count == 1) {
3300                         /* Flush any remaining cancel messages out to the
3301                          * target */
3302                         llog_sync(ctxt, exp, 0);
3303                 }
3304                 llog_ctxt_put(ctxt);
3305         } else {
3306                 CDEBUG(D_HA, "No LLOG_SIZE_REPL_CTXT found in obd %p\n",
3307                        obd);
3308         }
3309
3310         rc = client_disconnect_export(exp);
3311         /**
3312          * Initially we put del_shrink_grant before disconnect_export, but it
3313          * causes the following problem if setup (connect) and cleanup
3314          * (disconnect) are tangled together.
3315          *      connect p1                     disconnect p2
3316          *   ptlrpc_connect_import
3317          *     ...............               class_manual_cleanup
3318          *                                     osc_disconnect
3319          *                                     del_shrink_grant
3320          *   ptlrpc_connect_interrupt
3321          *     init_grant_shrink
3322          *   add this client to shrink list
3323          *                                      cleanup_osc
3324          * Bang! pinger trigger the shrink.
3325          * So the osc should be disconnected from the shrink list, after we
3326          * are sure the import has been destroyed. BUG18662
3327          */
3328         if (obd->u.cli.cl_import == NULL)
3329                 osc_del_shrink_grant(&obd->u.cli);
3330         return rc;
3331 }
3332
3333 static int osc_import_event(struct obd_device *obd,
3334                             struct obd_import *imp,
3335                             enum obd_import_event event)
3336 {
3337         struct client_obd *cli;
3338         int rc = 0;
3339
3340         ENTRY;
3341         LASSERT(imp->imp_obd == obd);
3342
3343         switch (event) {
3344         case IMP_EVENT_DISCON: {
3345                 cli = &obd->u.cli;
3346                 client_obd_list_lock(&cli->cl_loi_list_lock);
3347                 cli->cl_avail_grant = 0;
3348                 cli->cl_lost_grant = 0;
3349                 client_obd_list_unlock(&cli->cl_loi_list_lock);
3350                 break;
3351         }
3352         case IMP_EVENT_INACTIVE: {
3353                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_INACTIVE, NULL);
3354                 break;
3355         }
3356         case IMP_EVENT_INVALIDATE: {
3357                 struct ldlm_namespace *ns = obd->obd_namespace;
3358                 struct lu_env         *env;
3359                 int                    refcheck;
3360
3361                 env = cl_env_get(&refcheck);
3362                 if (!IS_ERR(env)) {
3363                         /* Reset grants */
3364                         cli = &obd->u.cli;
3365                         /* all pages go to failing rpcs due to the invalid
3366                          * import */
3367                         osc_io_unplug(env, cli, NULL, PDL_POLICY_ROUND);
3368
3369                         ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
3370                         cl_env_put(env, &refcheck);
3371                 } else
3372                         rc = PTR_ERR(env);
3373                 break;
3374         }
3375         case IMP_EVENT_ACTIVE: {
3376                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVE, NULL);
3377                 break;
3378         }
3379         case IMP_EVENT_OCD: {
3380                 struct obd_connect_data *ocd = &imp->imp_connect_data;
3381
3382                 if (ocd->ocd_connect_flags & OBD_CONNECT_GRANT)
3383                         osc_init_grant(&obd->u.cli, ocd);
3384
3385                 /* See bug 7198 */
3386                 if (ocd->ocd_connect_flags & OBD_CONNECT_REQPORTAL)
3387                         imp->imp_client->cli_request_portal =OST_REQUEST_PORTAL;
3388
3389                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_OCD, NULL);
3390                 break;
3391         }
3392         case IMP_EVENT_DEACTIVATE: {
3393                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_DEACTIVATE, NULL);
3394                 break;
3395         }
3396         case IMP_EVENT_ACTIVATE: {
3397                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVATE, NULL);
3398                 break;
3399         }
3400         default:
3401                 CERROR("Unknown import event %d\n", event);
3402                 LBUG();
3403         }
3404         RETURN(rc);
3405 }
3406
3407 /**
3408  * Determine whether the lock can be canceled before replaying the lock
3409  * during recovery, see bug16774 for detailed information.
3410  *
3411  * \retval zero the lock can't be canceled
3412  * \retval other ok to cancel
3413  */
3414 static int osc_cancel_for_recovery(struct ldlm_lock *lock)
3415 {
3416         check_res_locked(lock->l_resource);
3417
3418         /*
3419          * Cancel all unused extent lock in granted mode LCK_PR or LCK_CR.
3420          *
3421          * XXX as a future improvement, we can also cancel unused write lock
3422          * if it doesn't have dirty data and active mmaps.
3423          */
3424         if (lock->l_resource->lr_type == LDLM_EXTENT &&
3425             (lock->l_granted_mode == LCK_PR ||
3426              lock->l_granted_mode == LCK_CR) &&
3427             (osc_dlm_lock_pageref(lock) == 0))
3428                 RETURN(1);
3429
3430         RETURN(0);
3431 }
3432
3433 static int brw_queue_work(const struct lu_env *env, void *data)
3434 {
3435         struct client_obd *cli = data;
3436
3437         CDEBUG(D_CACHE, "Run writeback work for client obd %p.\n", cli);
3438
3439         osc_io_unplug(env, cli, NULL, PDL_POLICY_SAME);
3440         RETURN(0);
3441 }
3442
3443 int osc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
3444 {
3445         struct lprocfs_static_vars lvars = { 0 };
3446         struct client_obd          *cli = &obd->u.cli;
3447         void                       *handler;
3448         int                        rc;
3449         ENTRY;
3450
3451         rc = ptlrpcd_addref();
3452         if (rc)
3453                 RETURN(rc);
3454
3455         rc = client_obd_setup(obd, lcfg);
3456         if (rc)
3457                 GOTO(out_ptlrpcd, rc);
3458
3459         handler = ptlrpcd_alloc_work(cli->cl_import, brw_queue_work, cli);
3460         if (IS_ERR(handler))
3461                 GOTO(out_client_setup, rc = PTR_ERR(handler));
3462         cli->cl_writeback_work = handler;
3463
3464         rc = osc_quota_setup(obd);
3465         if (rc)
3466                 GOTO(out_ptlrpcd_work, rc);
3467
3468         cli->cl_grant_shrink_interval = GRANT_SHRINK_INTERVAL;
3469         lprocfs_osc_init_vars(&lvars);
3470         if (lprocfs_obd_setup(obd, lvars.obd_vars) == 0) {
3471                 lproc_osc_attach_seqstat(obd);
3472                 sptlrpc_lprocfs_cliobd_attach(obd);
3473                 ptlrpc_lprocfs_register_obd(obd);
3474         }
3475
3476         /* We need to allocate a few requests more, because
3477          * brw_interpret tries to create new requests before freeing
3478          * previous ones, Ideally we want to have 2x max_rpcs_in_flight
3479          * reserved, but I'm afraid that might be too much wasted RAM
3480          * in fact, so 2 is just my guess and still should work. */
3481         cli->cl_import->imp_rq_pool =
3482                 ptlrpc_init_rq_pool(cli->cl_max_rpcs_in_flight + 2,
3483                                     OST_MAXREQSIZE,
3484                                     ptlrpc_add_rqs_to_pool);
3485
3486         CFS_INIT_LIST_HEAD(&cli->cl_grant_shrink_list);
3487         ns_register_cancel(obd->obd_namespace, osc_cancel_for_recovery);
3488         RETURN(rc);
3489
3490 out_ptlrpcd_work:
3491         ptlrpcd_destroy_work(handler);
3492 out_client_setup:
3493         client_obd_cleanup(obd);
3494 out_ptlrpcd:
3495         ptlrpcd_decref();
3496         RETURN(rc);
3497 }
3498
3499 static int osc_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
3500 {
3501         int rc = 0;
3502         ENTRY;
3503
3504         switch (stage) {
3505         case OBD_CLEANUP_EARLY: {
3506                 struct obd_import *imp;
3507                 imp = obd->u.cli.cl_import;
3508                 CDEBUG(D_HA, "Deactivating import %s\n", obd->obd_name);
3509                 /* ptlrpc_abort_inflight to stop an mds_lov_synchronize */
3510                 ptlrpc_deactivate_import(imp);
3511                 spin_lock(&imp->imp_lock);
3512                 imp->imp_pingable = 0;
3513                 spin_unlock(&imp->imp_lock);
3514                 break;
3515         }
3516         case OBD_CLEANUP_EXPORTS: {
3517                 struct client_obd *cli = &obd->u.cli;
3518                 /* LU-464
3519                  * for echo client, export may be on zombie list, wait for
3520                  * zombie thread to cull it, because cli.cl_import will be
3521                  * cleared in client_disconnect_export():
3522                  *   class_export_destroy() -> obd_cleanup() ->
3523                  *   echo_device_free() -> echo_client_cleanup() ->
3524                  *   obd_disconnect() -> osc_disconnect() ->
3525                  *   client_disconnect_export()
3526                  */
3527                 obd_zombie_barrier();
3528                 if (cli->cl_writeback_work) {
3529                         ptlrpcd_destroy_work(cli->cl_writeback_work);
3530                         cli->cl_writeback_work = NULL;
3531                 }
3532                 obd_cleanup_client_import(obd);
3533                 ptlrpc_lprocfs_unregister_obd(obd);
3534                 lprocfs_obd_cleanup(obd);
3535                 rc = obd_llog_finish(obd, 0);
3536                 if (rc != 0)
3537                         CERROR("failed to cleanup llogging subsystems\n");
3538                 break;
3539                 }
3540         }
3541         RETURN(rc);
3542 }
3543
3544 int osc_cleanup(struct obd_device *obd)
3545 {
3546         struct client_obd *cli = &obd->u.cli;
3547         int rc;
3548
3549         ENTRY;
3550
3551         /* lru cleanup */
3552         if (cli->cl_cache != NULL) {
3553                 LASSERT(cfs_atomic_read(&cli->cl_cache->ccc_users) > 0);
3554                 spin_lock(&cli->cl_cache->ccc_lru_lock);
3555                 cfs_list_del_init(&cli->cl_lru_osc);
3556                 spin_unlock(&cli->cl_cache->ccc_lru_lock);
3557                 cli->cl_lru_left = NULL;
3558                 cfs_atomic_dec(&cli->cl_cache->ccc_users);
3559                 cli->cl_cache = NULL;
3560         }
3561
3562         /* free memory of osc quota cache */
3563         osc_quota_cleanup(obd);
3564
3565         rc = client_obd_cleanup(obd);
3566
3567         ptlrpcd_decref();
3568         RETURN(rc);
3569 }
3570
3571 int osc_process_config_base(struct obd_device *obd, struct lustre_cfg *lcfg)
3572 {
3573         struct lprocfs_static_vars lvars = { 0 };
3574         int rc = 0;
3575
3576         lprocfs_osc_init_vars(&lvars);
3577
3578         switch (lcfg->lcfg_command) {
3579         default:
3580                 rc = class_process_proc_param(PARAM_OSC, lvars.obd_vars,
3581                                               lcfg, obd);
3582                 if (rc > 0)
3583                         rc = 0;
3584                 break;
3585         }
3586
3587         return(rc);
3588 }
3589
3590 static int osc_process_config(struct obd_device *obd, obd_count len, void *buf)
3591 {
3592         return osc_process_config_base(obd, buf);
3593 }
3594
3595 struct obd_ops osc_obd_ops = {
3596         .o_owner                = THIS_MODULE,
3597         .o_setup                = osc_setup,
3598         .o_precleanup           = osc_precleanup,
3599         .o_cleanup              = osc_cleanup,
3600         .o_add_conn             = client_import_add_conn,
3601         .o_del_conn             = client_import_del_conn,
3602         .o_connect              = client_connect_import,
3603         .o_reconnect            = osc_reconnect,
3604         .o_disconnect           = osc_disconnect,
3605         .o_statfs               = osc_statfs,
3606         .o_statfs_async         = osc_statfs_async,
3607         .o_packmd               = osc_packmd,
3608         .o_unpackmd             = osc_unpackmd,
3609         .o_create               = osc_create,
3610         .o_destroy              = osc_destroy,
3611         .o_getattr              = osc_getattr,
3612         .o_getattr_async        = osc_getattr_async,
3613         .o_setattr              = osc_setattr,
3614         .o_setattr_async        = osc_setattr_async,
3615         .o_brw                  = osc_brw,
3616         .o_punch                = osc_punch,
3617         .o_sync                 = osc_sync,
3618         .o_enqueue              = osc_enqueue,
3619         .o_change_cbdata        = osc_change_cbdata,
3620         .o_find_cbdata          = osc_find_cbdata,
3621         .o_cancel               = osc_cancel,
3622         .o_cancel_unused        = osc_cancel_unused,
3623         .o_iocontrol            = osc_iocontrol,
3624         .o_get_info             = osc_get_info,
3625         .o_set_info_async       = osc_set_info_async,
3626         .o_import_event         = osc_import_event,
3627         .o_llog_init            = osc_llog_init,
3628         .o_llog_finish          = osc_llog_finish,
3629         .o_process_config       = osc_process_config,
3630         .o_quotactl             = osc_quotactl,
3631         .o_quotacheck           = osc_quotacheck,
3632 };
3633
3634 extern struct lu_kmem_descr osc_caches[];
3635 extern spinlock_t osc_ast_guard;
3636 extern struct lock_class_key osc_ast_guard_class;
3637
3638 int __init osc_init(void)
3639 {
3640         struct lprocfs_static_vars lvars = { 0 };
3641         int rc;
3642         ENTRY;
3643
3644         /* print an address of _any_ initialized kernel symbol from this
3645          * module, to allow debugging with gdb that doesn't support data
3646          * symbols from modules.*/
3647         CDEBUG(D_INFO, "Lustre OSC module (%p).\n", &osc_caches);
3648
3649         rc = lu_kmem_init(osc_caches);
3650
3651         lprocfs_osc_init_vars(&lvars);
3652
3653         rc = class_register_type(&osc_obd_ops, NULL, lvars.module_vars,
3654                                  LUSTRE_OSC_NAME, &osc_device_type);
3655         if (rc) {
3656                 lu_kmem_fini(osc_caches);
3657                 RETURN(rc);
3658         }
3659
3660         spin_lock_init(&osc_ast_guard);
3661         lockdep_set_class(&osc_ast_guard, &osc_ast_guard_class);
3662
3663         RETURN(rc);
3664 }
3665
3666 #ifdef __KERNEL__
3667 static void /*__exit*/ osc_exit(void)
3668 {
3669         class_unregister_type(LUSTRE_OSC_NAME);
3670         lu_kmem_fini(osc_caches);
3671 }
3672
3673 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
3674 MODULE_DESCRIPTION("Lustre Object Storage Client (OSC)");
3675 MODULE_LICENSE("GPL");
3676
3677 cfs_module(osc, LUSTRE_VERSION_STRING, osc_init, osc_exit);
3678 #endif