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[fs/lustre-release.git] / lustre / osc / osc_request.c
1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2  * vim:expandtab:shiftwidth=8:tabstop=8:
3  *
4  * GPL HEADER START
5  *
6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 only,
10  * as published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * General Public License version 2 for more details (a copy is included
16  * in the LICENSE file that accompanied this code).
17  *
18  * You should have received a copy of the GNU General Public License
19  * version 2 along with this program; If not, see
20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
21  *
22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23  * CA 95054 USA or visit www.sun.com if you need additional information or
24  * have any questions.
25  *
26  * GPL HEADER END
27  */
28 /*
29  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
30  * Use is subject to license terms.
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 #ifndef EXPORT_SYMTAB
38 # define EXPORT_SYMTAB
39 #endif
40 #define DEBUG_SUBSYSTEM S_OSC
41
42 #include <libcfs/libcfs.h>
43
44 #ifndef __KERNEL__
45 # include <liblustre.h>
46 #endif
47
48 #include <lustre_dlm.h>
49 #include <lustre_net.h>
50 #include <lustre/lustre_user.h>
51 #include <obd_cksum.h>
52 #include <obd_ost.h>
53 #include <obd_lov.h>
54
55 #ifdef  __CYGWIN__
56 # include <ctype.h>
57 #endif
58
59 #include <lustre_ha.h>
60 #include <lprocfs_status.h>
61 #include <lustre_log.h>
62 #include <lustre_debug.h>
63 #include <lustre_param.h>
64 #include "osc_internal.h"
65
66 static quota_interface_t *quota_interface = NULL;
67 extern quota_interface_t osc_quota_interface;
68
69 static void osc_release_ppga(struct brw_page **ppga, obd_count count);
70 static int brw_interpret(const struct lu_env *env,
71                          struct ptlrpc_request *req, void *data, int rc);
72 int osc_cleanup(struct obd_device *obd);
73
74 /* Pack OSC object metadata for disk storage (LE byte order). */
75 static int osc_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
76                       struct lov_stripe_md *lsm)
77 {
78         int lmm_size;
79         ENTRY;
80
81         lmm_size = sizeof(**lmmp);
82         if (!lmmp)
83                 RETURN(lmm_size);
84
85         if (*lmmp && !lsm) {
86                 OBD_FREE(*lmmp, lmm_size);
87                 *lmmp = NULL;
88                 RETURN(0);
89         }
90
91         if (!*lmmp) {
92                 OBD_ALLOC(*lmmp, lmm_size);
93                 if (!*lmmp)
94                         RETURN(-ENOMEM);
95         }
96
97         if (lsm) {
98                 LASSERT(lsm->lsm_object_id);
99                 LASSERT_SEQ_IS_MDT(lsm->lsm_object_seq);
100                 (*lmmp)->lmm_object_id = cpu_to_le64(lsm->lsm_object_id);
101                 (*lmmp)->lmm_object_seq = cpu_to_le64(lsm->lsm_object_seq);
102         }
103
104         RETURN(lmm_size);
105 }
106
107 /* Unpack OSC object metadata from disk storage (LE byte order). */
108 static int osc_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
109                         struct lov_mds_md *lmm, int lmm_bytes)
110 {
111         int lsm_size;
112         ENTRY;
113
114         if (lmm != NULL) {
115                 if (lmm_bytes < sizeof (*lmm)) {
116                         CERROR("lov_mds_md too small: %d, need %d\n",
117                                lmm_bytes, (int)sizeof(*lmm));
118                         RETURN(-EINVAL);
119                 }
120                 /* XXX LOV_MAGIC etc check? */
121
122                 if (lmm->lmm_object_id == 0) {
123                         CERROR("lov_mds_md: zero lmm_object_id\n");
124                         RETURN(-EINVAL);
125                 }
126         }
127
128         lsm_size = lov_stripe_md_size(1);
129         if (lsmp == NULL)
130                 RETURN(lsm_size);
131
132         if (*lsmp != NULL && lmm == NULL) {
133                 OBD_FREE((*lsmp)->lsm_oinfo[0], sizeof(struct lov_oinfo));
134                 OBD_FREE(*lsmp, lsm_size);
135                 *lsmp = NULL;
136                 RETURN(0);
137         }
138
139         if (*lsmp == NULL) {
140                 OBD_ALLOC(*lsmp, lsm_size);
141                 if (*lsmp == NULL)
142                         RETURN(-ENOMEM);
143                 OBD_ALLOC((*lsmp)->lsm_oinfo[0], sizeof(struct lov_oinfo));
144                 if ((*lsmp)->lsm_oinfo[0] == NULL) {
145                         OBD_FREE(*lsmp, lsm_size);
146                         RETURN(-ENOMEM);
147                 }
148                 loi_init((*lsmp)->lsm_oinfo[0]);
149         }
150
151         if (lmm != NULL) {
152                 /* XXX zero *lsmp? */
153                 (*lsmp)->lsm_object_id = le64_to_cpu (lmm->lmm_object_id);
154                 (*lsmp)->lsm_object_seq = le64_to_cpu (lmm->lmm_object_seq);
155                 LASSERT((*lsmp)->lsm_object_id);
156                 LASSERT_SEQ_IS_MDT((*lsmp)->lsm_object_seq);
157         }
158
159         (*lsmp)->lsm_maxbytes = LUSTRE_STRIPE_MAXBYTES;
160
161         RETURN(lsm_size);
162 }
163
164 static inline void osc_pack_capa(struct ptlrpc_request *req,
165                                  struct ost_body *body, void *capa)
166 {
167         struct obd_capa *oc = (struct obd_capa *)capa;
168         struct lustre_capa *c;
169
170         if (!capa)
171                 return;
172
173         c = req_capsule_client_get(&req->rq_pill, &RMF_CAPA1);
174         LASSERT(c);
175         capa_cpy(c, oc);
176         body->oa.o_valid |= OBD_MD_FLOSSCAPA;
177         DEBUG_CAPA(D_SEC, c, "pack");
178 }
179
180 static inline void osc_pack_req_body(struct ptlrpc_request *req,
181                                      struct obd_info *oinfo)
182 {
183         struct ost_body *body;
184
185         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
186         LASSERT(body);
187
188         lustre_set_wire_obdo(&body->oa, oinfo->oi_oa);
189         osc_pack_capa(req, body, oinfo->oi_capa);
190 }
191
192 static inline void osc_set_capa_size(struct ptlrpc_request *req,
193                                      const struct req_msg_field *field,
194                                      struct obd_capa *oc)
195 {
196         if (oc == NULL)
197                 req_capsule_set_size(&req->rq_pill, field, RCL_CLIENT, 0);
198         else
199                 /* it is already calculated as sizeof struct obd_capa */
200                 ;
201 }
202
203 static int osc_getattr_interpret(const struct lu_env *env,
204                                  struct ptlrpc_request *req,
205                                  struct osc_async_args *aa, int rc)
206 {
207         struct ost_body *body;
208         ENTRY;
209
210         if (rc != 0)
211                 GOTO(out, rc);
212
213         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
214         if (body) {
215                 CDEBUG(D_INODE, "mode: %o\n", body->oa.o_mode);
216                 lustre_get_wire_obdo(aa->aa_oi->oi_oa, &body->oa);
217
218                 /* This should really be sent by the OST */
219                 aa->aa_oi->oi_oa->o_blksize = PTLRPC_MAX_BRW_SIZE;
220                 aa->aa_oi->oi_oa->o_valid |= OBD_MD_FLBLKSZ;
221         } else {
222                 CDEBUG(D_INFO, "can't unpack ost_body\n");
223                 rc = -EPROTO;
224                 aa->aa_oi->oi_oa->o_valid = 0;
225         }
226 out:
227         rc = aa->aa_oi->oi_cb_up(aa->aa_oi, rc);
228         RETURN(rc);
229 }
230
231 static int osc_getattr_async(struct obd_export *exp, struct obd_info *oinfo,
232                              struct ptlrpc_request_set *set)
233 {
234         struct ptlrpc_request *req;
235         struct osc_async_args *aa;
236         int                    rc;
237         ENTRY;
238
239         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_GETATTR);
240         if (req == NULL)
241                 RETURN(-ENOMEM);
242
243         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
244         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_GETATTR);
245         if (rc) {
246                 ptlrpc_request_free(req);
247                 RETURN(rc);
248         }
249
250         osc_pack_req_body(req, oinfo);
251
252         ptlrpc_request_set_replen(req);
253         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_getattr_interpret;
254
255         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
256         aa = ptlrpc_req_async_args(req);
257         aa->aa_oi = oinfo;
258
259         ptlrpc_set_add_req(set, req);
260         RETURN(0);
261 }
262
263 static int osc_getattr(struct obd_export *exp, 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         /* This should really be sent by the OST */
297         oinfo->oi_oa->o_blksize = PTLRPC_MAX_BRW_SIZE;
298         oinfo->oi_oa->o_valid |= OBD_MD_FLBLKSZ;
299
300         EXIT;
301  out:
302         ptlrpc_req_finished(req);
303         return rc;
304 }
305
306 static int osc_setattr(struct obd_export *exp, struct obd_info *oinfo,
307                        struct obd_trans_info *oti)
308 {
309         struct ptlrpc_request *req;
310         struct ost_body       *body;
311         int                    rc;
312         ENTRY;
313
314         LASSERT(oinfo->oi_oa->o_valid & OBD_MD_FLGROUP);
315
316         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SETATTR);
317         if (req == NULL)
318                 RETURN(-ENOMEM);
319
320         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
321         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SETATTR);
322         if (rc) {
323                 ptlrpc_request_free(req);
324                 RETURN(rc);
325         }
326
327         osc_pack_req_body(req, oinfo);
328
329         ptlrpc_request_set_replen(req);
330
331         rc = ptlrpc_queue_wait(req);
332         if (rc)
333                 GOTO(out, rc);
334
335         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
336         if (body == NULL)
337                 GOTO(out, rc = -EPROTO);
338
339         lustre_get_wire_obdo(oinfo->oi_oa, &body->oa);
340
341         EXIT;
342 out:
343         ptlrpc_req_finished(req);
344         RETURN(rc);
345 }
346
347 static int osc_setattr_interpret(const struct lu_env *env,
348                                  struct ptlrpc_request *req,
349                                  struct osc_setattr_args *sa, int rc)
350 {
351         struct ost_body *body;
352         ENTRY;
353
354         if (rc != 0)
355                 GOTO(out, rc);
356
357         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
358         if (body == NULL)
359                 GOTO(out, rc = -EPROTO);
360
361         lustre_get_wire_obdo(sa->sa_oa, &body->oa);
362 out:
363         rc = sa->sa_upcall(sa->sa_cookie, rc);
364         RETURN(rc);
365 }
366
367 int osc_setattr_async_base(struct obd_export *exp, struct obd_info *oinfo,
368                            struct obd_trans_info *oti,
369                            obd_enqueue_update_f upcall, void *cookie,
370                            struct ptlrpc_request_set *rqset)
371 {
372         struct ptlrpc_request   *req;
373         struct osc_setattr_args *sa;
374         int                      rc;
375         ENTRY;
376
377         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SETATTR);
378         if (req == NULL)
379                 RETURN(-ENOMEM);
380
381         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
382         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SETATTR);
383         if (rc) {
384                 ptlrpc_request_free(req);
385                 RETURN(rc);
386         }
387
388         if (oti && oinfo->oi_oa->o_valid & OBD_MD_FLCOOKIE)
389                 oinfo->oi_oa->o_lcookie = *oti->oti_logcookies;
390
391         osc_pack_req_body(req, oinfo);
392
393         ptlrpc_request_set_replen(req);
394
395         /* do mds to ost setattr asynchronously */
396         if (!rqset) {
397                 /* Do not wait for response. */
398                 ptlrpcd_add_req(req, PSCOPE_OTHER);
399         } else {
400                 req->rq_interpret_reply =
401                         (ptlrpc_interpterer_t)osc_setattr_interpret;
402
403                 CLASSERT (sizeof(*sa) <= sizeof(req->rq_async_args));
404                 sa = ptlrpc_req_async_args(req);
405                 sa->sa_oa = oinfo->oi_oa;
406                 sa->sa_upcall = upcall;
407                 sa->sa_cookie = cookie;
408
409                 if (rqset == PTLRPCD_SET)
410                         ptlrpcd_add_req(req, PSCOPE_OTHER);
411                 else
412                         ptlrpc_set_add_req(rqset, req);
413         }
414
415         RETURN(0);
416 }
417
418 static int osc_setattr_async(struct obd_export *exp, struct obd_info *oinfo,
419                              struct obd_trans_info *oti,
420                              struct ptlrpc_request_set *rqset)
421 {
422         return osc_setattr_async_base(exp, oinfo, oti,
423                                       oinfo->oi_cb_up, oinfo, rqset);
424 }
425
426 int osc_real_create(struct obd_export *exp, struct obdo *oa,
427                     struct lov_stripe_md **ea, struct obd_trans_info *oti)
428 {
429         struct ptlrpc_request *req;
430         struct ost_body       *body;
431         struct lov_stripe_md  *lsm;
432         int                    rc;
433         ENTRY;
434
435         LASSERT(oa);
436         LASSERT(ea);
437
438         lsm = *ea;
439         if (!lsm) {
440                 rc = obd_alloc_memmd(exp, &lsm);
441                 if (rc < 0)
442                         RETURN(rc);
443         }
444
445         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_CREATE);
446         if (req == NULL)
447                 GOTO(out, rc = -ENOMEM);
448
449         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_CREATE);
450         if (rc) {
451                 ptlrpc_request_free(req);
452                 GOTO(out, rc);
453         }
454
455         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
456         LASSERT(body);
457         lustre_set_wire_obdo(&body->oa, oa);
458
459         ptlrpc_request_set_replen(req);
460
461         if ((oa->o_valid & OBD_MD_FLFLAGS) &&
462             oa->o_flags == OBD_FL_DELORPHAN) {
463                 DEBUG_REQ(D_HA, req,
464                           "delorphan from OST integration");
465                 /* Don't resend the delorphan req */
466                 req->rq_no_resend = req->rq_no_delay = 1;
467         }
468
469         rc = ptlrpc_queue_wait(req);
470         if (rc)
471                 GOTO(out_req, rc);
472
473         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
474         if (body == NULL)
475                 GOTO(out_req, rc = -EPROTO);
476
477         lustre_get_wire_obdo(oa, &body->oa);
478
479         /* This should really be sent by the OST */
480         oa->o_blksize = PTLRPC_MAX_BRW_SIZE;
481         oa->o_valid |= OBD_MD_FLBLKSZ;
482
483         /* XXX LOV STACKING: the lsm that is passed to us from LOV does not
484          * have valid lsm_oinfo data structs, so don't go touching that.
485          * This needs to be fixed in a big way.
486          */
487         lsm->lsm_object_id = oa->o_id;
488         lsm->lsm_object_seq = oa->o_seq;
489         *ea = lsm;
490
491         if (oti != NULL) {
492                 oti->oti_transno = lustre_msg_get_transno(req->rq_repmsg);
493
494                 if (oa->o_valid & OBD_MD_FLCOOKIE) {
495                         if (!oti->oti_logcookies)
496                                 oti_alloc_cookies(oti, 1);
497                         *oti->oti_logcookies = oa->o_lcookie;
498                 }
499         }
500
501         CDEBUG(D_HA, "transno: "LPD64"\n",
502                lustre_msg_get_transno(req->rq_repmsg));
503 out_req:
504         ptlrpc_req_finished(req);
505 out:
506         if (rc && !*ea)
507                 obd_free_memmd(exp, &lsm);
508         RETURN(rc);
509 }
510
511 int osc_punch_base(struct obd_export *exp, struct obd_info *oinfo,
512                    obd_enqueue_update_f upcall, void *cookie,
513                    struct ptlrpc_request_set *rqset)
514 {
515         struct ptlrpc_request   *req;
516         struct osc_setattr_args *sa;
517         struct ost_body         *body;
518         int                      rc;
519         ENTRY;
520
521         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_PUNCH);
522         if (req == NULL)
523                 RETURN(-ENOMEM);
524
525         osc_set_capa_size(req, &RMF_CAPA1, oinfo->oi_capa);
526         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_PUNCH);
527         if (rc) {
528                 ptlrpc_request_free(req);
529                 RETURN(rc);
530         }
531         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
532         ptlrpc_at_set_req_timeout(req);
533
534         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
535         LASSERT(body);
536         lustre_set_wire_obdo(&body->oa, oinfo->oi_oa);
537         osc_pack_capa(req, body, oinfo->oi_capa);
538
539         ptlrpc_request_set_replen(req);
540
541
542         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_setattr_interpret;
543         CLASSERT (sizeof(*sa) <= sizeof(req->rq_async_args));
544         sa = ptlrpc_req_async_args(req);
545         sa->sa_oa     = oinfo->oi_oa;
546         sa->sa_upcall = upcall;
547         sa->sa_cookie = cookie;
548         if (rqset == PTLRPCD_SET)
549                 ptlrpcd_add_req(req, PSCOPE_OTHER);
550         else
551                 ptlrpc_set_add_req(rqset, req);
552
553         RETURN(0);
554 }
555
556 static int osc_punch(struct obd_export *exp, struct obd_info *oinfo,
557                      struct obd_trans_info *oti,
558                      struct ptlrpc_request_set *rqset)
559 {
560         oinfo->oi_oa->o_size   = oinfo->oi_policy.l_extent.start;
561         oinfo->oi_oa->o_blocks = oinfo->oi_policy.l_extent.end;
562         oinfo->oi_oa->o_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
563         return osc_punch_base(exp, oinfo,
564                               oinfo->oi_cb_up, oinfo, rqset);
565 }
566
567 static int osc_sync(struct obd_export *exp, struct obdo *oa,
568                     struct lov_stripe_md *md, obd_size start, obd_size end,
569                     void *capa)
570 {
571         struct ptlrpc_request *req;
572         struct ost_body       *body;
573         int                    rc;
574         ENTRY;
575
576         if (!oa) {
577                 CDEBUG(D_INFO, "oa NULL\n");
578                 RETURN(-EINVAL);
579         }
580
581         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_SYNC);
582         if (req == NULL)
583                 RETURN(-ENOMEM);
584
585         osc_set_capa_size(req, &RMF_CAPA1, capa);
586         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SYNC);
587         if (rc) {
588                 ptlrpc_request_free(req);
589                 RETURN(rc);
590         }
591
592         /* overload the size and blocks fields in the oa with start/end */
593         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
594         LASSERT(body);
595         lustre_set_wire_obdo(&body->oa, oa);
596         body->oa.o_size = start;
597         body->oa.o_blocks = end;
598         body->oa.o_valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS);
599         osc_pack_capa(req, body, capa);
600
601         ptlrpc_request_set_replen(req);
602
603         rc = ptlrpc_queue_wait(req);
604         if (rc)
605                 GOTO(out, rc);
606
607         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
608         if (body == NULL)
609                 GOTO(out, rc = -EPROTO);
610
611         lustre_get_wire_obdo(oa, &body->oa);
612
613         EXIT;
614  out:
615         ptlrpc_req_finished(req);
616         return rc;
617 }
618
619 /* Find and cancel locally locks matched by @mode in the resource found by
620  * @objid. Found locks are added into @cancel list. Returns the amount of
621  * locks added to @cancels list. */
622 static int osc_resource_get_unused(struct obd_export *exp, struct obdo *oa,
623                                    cfs_list_t *cancels,
624                                    ldlm_mode_t mode, int lock_flags)
625 {
626         struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
627         struct ldlm_res_id res_id;
628         struct ldlm_resource *res;
629         int count;
630         ENTRY;
631
632         osc_build_res_name(oa->o_id, oa->o_seq, &res_id);
633         res = ldlm_resource_get(ns, NULL, &res_id, 0, 0);
634         if (res == NULL)
635                 RETURN(0);
636
637         LDLM_RESOURCE_ADDREF(res);
638         count = ldlm_cancel_resource_local(res, cancels, NULL, mode,
639                                            lock_flags, 0, NULL);
640         LDLM_RESOURCE_DELREF(res);
641         ldlm_resource_putref(res);
642         RETURN(count);
643 }
644
645 static int osc_destroy_interpret(const struct lu_env *env,
646                                  struct ptlrpc_request *req, void *data,
647                                  int rc)
648 {
649         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
650
651         cfs_atomic_dec(&cli->cl_destroy_in_flight);
652         cfs_waitq_signal(&cli->cl_destroy_waitq);
653         return 0;
654 }
655
656 static int osc_can_send_destroy(struct client_obd *cli)
657 {
658         if (cfs_atomic_inc_return(&cli->cl_destroy_in_flight) <=
659             cli->cl_max_rpcs_in_flight) {
660                 /* The destroy request can be sent */
661                 return 1;
662         }
663         if (cfs_atomic_dec_return(&cli->cl_destroy_in_flight) <
664             cli->cl_max_rpcs_in_flight) {
665                 /*
666                  * The counter has been modified between the two atomic
667                  * operations.
668                  */
669                 cfs_waitq_signal(&cli->cl_destroy_waitq);
670         }
671         return 0;
672 }
673
674 /* Destroy requests can be async always on the client, and we don't even really
675  * care about the return code since the client cannot do anything at all about
676  * a destroy failure.
677  * When the MDS is unlinking a filename, it saves the file objects into a
678  * recovery llog, and these object records are cancelled when the OST reports
679  * they were destroyed and sync'd to disk (i.e. transaction committed).
680  * If the client dies, or the OST is down when the object should be destroyed,
681  * the records are not cancelled, and when the OST reconnects to the MDS next,
682  * it will retrieve the llog unlink logs and then sends the log cancellation
683  * cookies to the MDS after committing destroy transactions. */
684 static int osc_destroy(struct obd_export *exp, struct obdo *oa,
685                        struct lov_stripe_md *ea, struct obd_trans_info *oti,
686                        struct obd_export *md_export, void *capa)
687 {
688         struct client_obd     *cli = &exp->exp_obd->u.cli;
689         struct ptlrpc_request *req;
690         struct ost_body       *body;
691         CFS_LIST_HEAD(cancels);
692         int rc, count;
693         ENTRY;
694
695         if (!oa) {
696                 CDEBUG(D_INFO, "oa NULL\n");
697                 RETURN(-EINVAL);
698         }
699
700         count = osc_resource_get_unused(exp, oa, &cancels, LCK_PW,
701                                         LDLM_FL_DISCARD_DATA);
702
703         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_OST_DESTROY);
704         if (req == NULL) {
705                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
706                 RETURN(-ENOMEM);
707         }
708
709         osc_set_capa_size(req, &RMF_CAPA1, (struct obd_capa *)capa);
710         rc = ldlm_prep_elc_req(exp, req, LUSTRE_OST_VERSION, OST_DESTROY,
711                                0, &cancels, count);
712         if (rc) {
713                 ptlrpc_request_free(req);
714                 RETURN(rc);
715         }
716
717         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
718         ptlrpc_at_set_req_timeout(req);
719
720         if (oti != NULL && oa->o_valid & OBD_MD_FLCOOKIE)
721                 oa->o_lcookie = *oti->oti_logcookies;
722         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
723         LASSERT(body);
724         lustre_set_wire_obdo(&body->oa, oa);
725
726         osc_pack_capa(req, body, (struct obd_capa *)capa);
727         ptlrpc_request_set_replen(req);
728
729         /* don't throttle destroy RPCs for the MDT */
730         if (!(cli->cl_import->imp_connect_flags_orig & OBD_CONNECT_MDS)) {
731                 req->rq_interpret_reply = osc_destroy_interpret;
732                 if (!osc_can_send_destroy(cli)) {
733                         struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP,
734                                                           NULL);
735
736                         /*
737                          * Wait until the number of on-going destroy RPCs drops
738                          * under max_rpc_in_flight
739                          */
740                         l_wait_event_exclusive(cli->cl_destroy_waitq,
741                                                osc_can_send_destroy(cli), &lwi);
742                 }
743         }
744
745         /* Do not wait for response */
746         ptlrpcd_add_req(req, PSCOPE_OTHER);
747         RETURN(0);
748 }
749
750 static void osc_announce_cached(struct client_obd *cli, struct obdo *oa,
751                                 long writing_bytes)
752 {
753         obd_flag bits = OBD_MD_FLBLOCKS|OBD_MD_FLGRANT;
754
755         LASSERT(!(oa->o_valid & bits));
756
757         oa->o_valid |= bits;
758         client_obd_list_lock(&cli->cl_loi_list_lock);
759         oa->o_dirty = cli->cl_dirty;
760         if (cli->cl_dirty - cli->cl_dirty_transit > cli->cl_dirty_max) {
761                 CERROR("dirty %lu - %lu > dirty_max %lu\n",
762                        cli->cl_dirty, cli->cl_dirty_transit, cli->cl_dirty_max);
763                 oa->o_undirty = 0;
764         } else if (cfs_atomic_read(&obd_dirty_pages) -
765                    cfs_atomic_read(&obd_dirty_transit_pages) >
766                    obd_max_dirty_pages + 1){
767                 /* The cfs_atomic_read() allowing the cfs_atomic_inc() are
768                  * not covered by a lock thus they may safely race and trip
769                  * this CERROR() unless we add in a small fudge factor (+1). */
770                 CERROR("dirty %d - %d > system dirty_max %d\n",
771                        cfs_atomic_read(&obd_dirty_pages),
772                        cfs_atomic_read(&obd_dirty_transit_pages),
773                        obd_max_dirty_pages);
774                 oa->o_undirty = 0;
775         } else if (cli->cl_dirty_max - cli->cl_dirty > 0x7fffffff) {
776                 CERROR("dirty %lu - dirty_max %lu too big???\n",
777                        cli->cl_dirty, cli->cl_dirty_max);
778                 oa->o_undirty = 0;
779         } else {
780                 long max_in_flight = (cli->cl_max_pages_per_rpc << CFS_PAGE_SHIFT)*
781                                 (cli->cl_max_rpcs_in_flight + 1);
782                 oa->o_undirty = max(cli->cl_dirty_max, max_in_flight);
783         }
784         oa->o_grant = cli->cl_avail_grant;
785         oa->o_dropped = cli->cl_lost_grant;
786         cli->cl_lost_grant = 0;
787         client_obd_list_unlock(&cli->cl_loi_list_lock);
788         CDEBUG(D_CACHE,"dirty: "LPU64" undirty: %u dropped %u grant: "LPU64"\n",
789                oa->o_dirty, oa->o_undirty, oa->o_dropped, oa->o_grant);
790
791 }
792
793 static void osc_update_next_shrink(struct client_obd *cli)
794 {
795         cli->cl_next_shrink_grant =
796                 cfs_time_shift(cli->cl_grant_shrink_interval);
797         CDEBUG(D_CACHE, "next time %ld to shrink grant \n",
798                cli->cl_next_shrink_grant);
799 }
800
801 /* caller must hold loi_list_lock */
802 static void osc_consume_write_grant(struct client_obd *cli,
803                                     struct brw_page *pga)
804 {
805         LASSERT_SPIN_LOCKED(&cli->cl_loi_list_lock.lock);
806         LASSERT(!(pga->flag & OBD_BRW_FROM_GRANT));
807         cfs_atomic_inc(&obd_dirty_pages);
808         cli->cl_dirty += CFS_PAGE_SIZE;
809         cli->cl_avail_grant -= CFS_PAGE_SIZE;
810         pga->flag |= OBD_BRW_FROM_GRANT;
811         CDEBUG(D_CACHE, "using %lu grant credits for brw %p page %p\n",
812                CFS_PAGE_SIZE, pga, pga->pg);
813         LASSERT(cli->cl_avail_grant >= 0);
814         osc_update_next_shrink(cli);
815 }
816
817 /* the companion to osc_consume_write_grant, called when a brw has completed.
818  * must be called with the loi lock held. */
819 static void osc_release_write_grant(struct client_obd *cli,
820                                     struct brw_page *pga, int sent)
821 {
822         int blocksize = cli->cl_import->imp_obd->obd_osfs.os_bsize ? : 4096;
823         ENTRY;
824
825         LASSERT_SPIN_LOCKED(&cli->cl_loi_list_lock.lock);
826         if (!(pga->flag & OBD_BRW_FROM_GRANT)) {
827                 EXIT;
828                 return;
829         }
830
831         pga->flag &= ~OBD_BRW_FROM_GRANT;
832         cfs_atomic_dec(&obd_dirty_pages);
833         cli->cl_dirty -= CFS_PAGE_SIZE;
834         if (pga->flag & OBD_BRW_NOCACHE) {
835                 pga->flag &= ~OBD_BRW_NOCACHE;
836                 cfs_atomic_dec(&obd_dirty_transit_pages);
837                 cli->cl_dirty_transit -= CFS_PAGE_SIZE;
838         }
839         if (!sent) {
840                 cli->cl_lost_grant += CFS_PAGE_SIZE;
841                 CDEBUG(D_CACHE, "lost grant: %lu avail grant: %lu dirty: %lu\n",
842                        cli->cl_lost_grant, cli->cl_avail_grant, cli->cl_dirty);
843         } else if (CFS_PAGE_SIZE != blocksize && pga->count != CFS_PAGE_SIZE) {
844                 /* For short writes we shouldn't count parts of pages that
845                  * span a whole block on the OST side, or our accounting goes
846                  * wrong.  Should match the code in filter_grant_check. */
847                 int offset = pga->off & ~CFS_PAGE_MASK;
848                 int count = pga->count + (offset & (blocksize - 1));
849                 int end = (offset + pga->count) & (blocksize - 1);
850                 if (end)
851                         count += blocksize - end;
852
853                 cli->cl_lost_grant += CFS_PAGE_SIZE - count;
854                 CDEBUG(D_CACHE, "lost %lu grant: %lu avail: %lu dirty: %lu\n",
855                        CFS_PAGE_SIZE - count, cli->cl_lost_grant,
856                        cli->cl_avail_grant, cli->cl_dirty);
857         }
858
859         EXIT;
860 }
861
862 static unsigned long rpcs_in_flight(struct client_obd *cli)
863 {
864         return cli->cl_r_in_flight + cli->cl_w_in_flight;
865 }
866
867 /* caller must hold loi_list_lock */
868 void osc_wake_cache_waiters(struct client_obd *cli)
869 {
870         cfs_list_t *l, *tmp;
871         struct osc_cache_waiter *ocw;
872
873         ENTRY;
874         cfs_list_for_each_safe(l, tmp, &cli->cl_cache_waiters) {
875                 /* if we can't dirty more, we must wait until some is written */
876                 if ((cli->cl_dirty + CFS_PAGE_SIZE > cli->cl_dirty_max) ||
877                    (cfs_atomic_read(&obd_dirty_pages) + 1 >
878                     obd_max_dirty_pages)) {
879                         CDEBUG(D_CACHE, "no dirty room: dirty: %ld "
880                                "osc max %ld, sys max %d\n", cli->cl_dirty,
881                                cli->cl_dirty_max, obd_max_dirty_pages);
882                         return;
883                 }
884
885                 /* if still dirty cache but no grant wait for pending RPCs that
886                  * may yet return us some grant before doing sync writes */
887                 if (cli->cl_w_in_flight && cli->cl_avail_grant < CFS_PAGE_SIZE) {
888                         CDEBUG(D_CACHE, "%u BRW writes in flight, no grant\n",
889                                cli->cl_w_in_flight);
890                         return;
891                 }
892
893                 ocw = cfs_list_entry(l, struct osc_cache_waiter, ocw_entry);
894                 cfs_list_del_init(&ocw->ocw_entry);
895                 if (cli->cl_avail_grant < CFS_PAGE_SIZE) {
896                         /* no more RPCs in flight to return grant, do sync IO */
897                         ocw->ocw_rc = -EDQUOT;
898                         CDEBUG(D_INODE, "wake oap %p for sync\n", ocw->ocw_oap);
899                 } else {
900                         osc_consume_write_grant(cli,
901                                                 &ocw->ocw_oap->oap_brw_page);
902                 }
903
904                 cfs_waitq_signal(&ocw->ocw_waitq);
905         }
906
907         EXIT;
908 }
909
910 static void __osc_update_grant(struct client_obd *cli, obd_size grant)
911 {
912         client_obd_list_lock(&cli->cl_loi_list_lock);
913         cli->cl_avail_grant += grant;
914         client_obd_list_unlock(&cli->cl_loi_list_lock);
915 }
916
917 static void osc_update_grant(struct client_obd *cli, struct ost_body *body)
918 {
919         if (body->oa.o_valid & OBD_MD_FLGRANT) {
920                 CDEBUG(D_CACHE, "got "LPU64" extra grant\n", body->oa.o_grant);
921                 __osc_update_grant(cli, body->oa.o_grant);
922         }
923 }
924
925 static int osc_set_info_async(struct obd_export *exp, obd_count keylen,
926                               void *key, obd_count vallen, void *val,
927                               struct ptlrpc_request_set *set);
928
929 static int osc_shrink_grant_interpret(const struct lu_env *env,
930                                       struct ptlrpc_request *req,
931                                       void *aa, int rc)
932 {
933         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
934         struct obdo *oa = ((struct osc_grant_args *)aa)->aa_oa;
935         struct ost_body *body;
936
937         if (rc != 0) {
938                 __osc_update_grant(cli, oa->o_grant);
939                 GOTO(out, rc);
940         }
941
942         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
943         LASSERT(body);
944         osc_update_grant(cli, body);
945 out:
946         OBDO_FREE(oa);
947         return rc;
948 }
949
950 static void osc_shrink_grant_local(struct client_obd *cli, struct obdo *oa)
951 {
952         client_obd_list_lock(&cli->cl_loi_list_lock);
953         oa->o_grant = cli->cl_avail_grant / 4;
954         cli->cl_avail_grant -= oa->o_grant;
955         client_obd_list_unlock(&cli->cl_loi_list_lock);
956         oa->o_flags |= OBD_FL_SHRINK_GRANT;
957         osc_update_next_shrink(cli);
958 }
959
960 /* Shrink the current grant, either from some large amount to enough for a
961  * full set of in-flight RPCs, or if we have already shrunk to that limit
962  * then to enough for a single RPC.  This avoids keeping more grant than
963  * needed, and avoids shrinking the grant piecemeal. */
964 static int osc_shrink_grant(struct client_obd *cli)
965 {
966         long target = (cli->cl_max_rpcs_in_flight + 1) *
967                       cli->cl_max_pages_per_rpc;
968
969         client_obd_list_lock(&cli->cl_loi_list_lock);
970         if (cli->cl_avail_grant <= target)
971                 target = cli->cl_max_pages_per_rpc;
972         client_obd_list_unlock(&cli->cl_loi_list_lock);
973
974         return osc_shrink_grant_to_target(cli, target);
975 }
976
977 int osc_shrink_grant_to_target(struct client_obd *cli, long target)
978 {
979         int    rc = 0;
980         struct ost_body     *body;
981         ENTRY;
982
983         client_obd_list_lock(&cli->cl_loi_list_lock);
984         /* Don't shrink if we are already above or below the desired limit
985          * We don't want to shrink below a single RPC, as that will negatively
986          * impact block allocation and long-term performance. */
987         if (target < cli->cl_max_pages_per_rpc)
988                 target = cli->cl_max_pages_per_rpc;
989
990         if (target >= cli->cl_avail_grant) {
991                 client_obd_list_unlock(&cli->cl_loi_list_lock);
992                 RETURN(0);
993         }
994         client_obd_list_unlock(&cli->cl_loi_list_lock);
995
996         OBD_ALLOC_PTR(body);
997         if (!body)
998                 RETURN(-ENOMEM);
999
1000         osc_announce_cached(cli, &body->oa, 0);
1001
1002         client_obd_list_lock(&cli->cl_loi_list_lock);
1003         body->oa.o_grant = cli->cl_avail_grant - target;
1004         cli->cl_avail_grant = target;
1005         client_obd_list_unlock(&cli->cl_loi_list_lock);
1006         body->oa.o_flags |= OBD_FL_SHRINK_GRANT;
1007         osc_update_next_shrink(cli);
1008
1009         rc = osc_set_info_async(cli->cl_import->imp_obd->obd_self_export,
1010                                 sizeof(KEY_GRANT_SHRINK), KEY_GRANT_SHRINK,
1011                                 sizeof(*body), body, NULL);
1012         if (rc != 0)
1013                 __osc_update_grant(cli, body->oa.o_grant);
1014         OBD_FREE_PTR(body);
1015         RETURN(rc);
1016 }
1017
1018 #define GRANT_SHRINK_LIMIT PTLRPC_MAX_BRW_SIZE
1019 static int osc_should_shrink_grant(struct client_obd *client)
1020 {
1021         cfs_time_t time = cfs_time_current();
1022         cfs_time_t next_shrink = client->cl_next_shrink_grant;
1023
1024         if ((client->cl_import->imp_connect_data.ocd_connect_flags &
1025              OBD_CONNECT_GRANT_SHRINK) == 0)
1026                 return 0;
1027
1028         if (cfs_time_aftereq(time, next_shrink - 5 * CFS_TICK)) {
1029                 if (client->cl_import->imp_state == LUSTRE_IMP_FULL &&
1030                     client->cl_avail_grant > GRANT_SHRINK_LIMIT)
1031                         return 1;
1032                 else
1033                         osc_update_next_shrink(client);
1034         }
1035         return 0;
1036 }
1037
1038 static int osc_grant_shrink_grant_cb(struct timeout_item *item, void *data)
1039 {
1040         struct client_obd *client;
1041
1042         cfs_list_for_each_entry(client, &item->ti_obd_list,
1043                                 cl_grant_shrink_list) {
1044                 if (osc_should_shrink_grant(client))
1045                         osc_shrink_grant(client);
1046         }
1047         return 0;
1048 }
1049
1050 static int osc_add_shrink_grant(struct client_obd *client)
1051 {
1052         int rc;
1053
1054         rc = ptlrpc_add_timeout_client(client->cl_grant_shrink_interval,
1055                                        TIMEOUT_GRANT,
1056                                        osc_grant_shrink_grant_cb, NULL,
1057                                        &client->cl_grant_shrink_list);
1058         if (rc) {
1059                 CERROR("add grant client %s error %d\n",
1060                         client->cl_import->imp_obd->obd_name, rc);
1061                 return rc;
1062         }
1063         CDEBUG(D_CACHE, "add grant client %s \n",
1064                client->cl_import->imp_obd->obd_name);
1065         osc_update_next_shrink(client);
1066         return 0;
1067 }
1068
1069 static int osc_del_shrink_grant(struct client_obd *client)
1070 {
1071         return ptlrpc_del_timeout_client(&client->cl_grant_shrink_list,
1072                                          TIMEOUT_GRANT);
1073 }
1074
1075 static void osc_init_grant(struct client_obd *cli, struct obd_connect_data *ocd)
1076 {
1077         /*
1078          * ocd_grant is the total grant amount we're expect to hold: if we've
1079          * been evicted, it's the new avail_grant amount, cl_dirty will drop
1080          * to 0 as inflight RPCs fail out; otherwise, it's avail_grant + dirty.
1081          *
1082          * race is tolerable here: if we're evicted, but imp_state already
1083          * left EVICTED state, then cl_dirty must be 0 already.
1084          */
1085         client_obd_list_lock(&cli->cl_loi_list_lock);
1086         if (cli->cl_import->imp_state == LUSTRE_IMP_EVICTED)
1087                 cli->cl_avail_grant = ocd->ocd_grant;
1088         else
1089                 cli->cl_avail_grant = ocd->ocd_grant - cli->cl_dirty;
1090
1091         if (cli->cl_avail_grant < 0) {
1092                 CWARN("%s: available grant < 0, the OSS is probably not running"
1093                       " with patch from bug20278 (%ld) \n",
1094                       cli->cl_import->imp_obd->obd_name, cli->cl_avail_grant);
1095                 /* workaround for 1.6 servers which do not have 
1096                  * the patch from bug20278 */
1097                 cli->cl_avail_grant = ocd->ocd_grant;
1098         }
1099
1100         client_obd_list_unlock(&cli->cl_loi_list_lock);
1101
1102         CDEBUG(D_CACHE, "%s, setting cl_avail_grant: %ld cl_lost_grant: %ld \n",
1103                cli->cl_import->imp_obd->obd_name,
1104                cli->cl_avail_grant, cli->cl_lost_grant);
1105
1106         if (ocd->ocd_connect_flags & OBD_CONNECT_GRANT_SHRINK &&
1107             cfs_list_empty(&cli->cl_grant_shrink_list))
1108                 osc_add_shrink_grant(cli);
1109 }
1110
1111 /* We assume that the reason this OSC got a short read is because it read
1112  * beyond the end of a stripe file; i.e. lustre is reading a sparse file
1113  * via the LOV, and it _knows_ it's reading inside the file, it's just that
1114  * this stripe never got written at or beyond this stripe offset yet. */
1115 static void handle_short_read(int nob_read, obd_count page_count,
1116                               struct brw_page **pga)
1117 {
1118         char *ptr;
1119         int i = 0;
1120
1121         /* skip bytes read OK */
1122         while (nob_read > 0) {
1123                 LASSERT (page_count > 0);
1124
1125                 if (pga[i]->count > nob_read) {
1126                         /* EOF inside this page */
1127                         ptr = cfs_kmap(pga[i]->pg) +
1128                                 (pga[i]->off & ~CFS_PAGE_MASK);
1129                         memset(ptr + nob_read, 0, pga[i]->count - nob_read);
1130                         cfs_kunmap(pga[i]->pg);
1131                         page_count--;
1132                         i++;
1133                         break;
1134                 }
1135
1136                 nob_read -= pga[i]->count;
1137                 page_count--;
1138                 i++;
1139         }
1140
1141         /* zero remaining pages */
1142         while (page_count-- > 0) {
1143                 ptr = cfs_kmap(pga[i]->pg) + (pga[i]->off & ~CFS_PAGE_MASK);
1144                 memset(ptr, 0, pga[i]->count);
1145                 cfs_kunmap(pga[i]->pg);
1146                 i++;
1147         }
1148 }
1149
1150 static int check_write_rcs(struct ptlrpc_request *req,
1151                            int requested_nob, int niocount,
1152                            obd_count page_count, struct brw_page **pga)
1153 {
1154         int     i;
1155         __u32   *remote_rcs;
1156
1157         remote_rcs = req_capsule_server_sized_get(&req->rq_pill, &RMF_RCS,
1158                                                   sizeof(*remote_rcs) *
1159                                                   niocount);
1160         if (remote_rcs == NULL) {
1161                 CDEBUG(D_INFO, "Missing/short RC vector on BRW_WRITE reply\n");
1162                 return(-EPROTO);
1163         }
1164
1165         /* return error if any niobuf was in error */
1166         for (i = 0; i < niocount; i++) {
1167                 if (remote_rcs[i] < 0)
1168                         return(remote_rcs[i]);
1169
1170                 if (remote_rcs[i] != 0) {
1171                         CDEBUG(D_INFO, "rc[%d] invalid (%d) req %p\n",
1172                                 i, remote_rcs[i], req);
1173                         return(-EPROTO);
1174                 }
1175         }
1176
1177         if (req->rq_bulk->bd_nob_transferred != requested_nob) {
1178                 CERROR("Unexpected # bytes transferred: %d (requested %d)\n",
1179                        req->rq_bulk->bd_nob_transferred, requested_nob);
1180                 return(-EPROTO);
1181         }
1182
1183         return (0);
1184 }
1185
1186 static inline int can_merge_pages(struct brw_page *p1, struct brw_page *p2)
1187 {
1188         if (p1->flag != p2->flag) {
1189                 unsigned mask = ~(OBD_BRW_FROM_GRANT|
1190                                   OBD_BRW_NOCACHE|OBD_BRW_SYNC|OBD_BRW_ASYNC);
1191
1192                 /* warn if we try to combine flags that we don't know to be
1193                  * safe to combine */
1194                 if ((p1->flag & mask) != (p2->flag & mask))
1195                         CERROR("is it ok to have flags 0x%x and 0x%x in the "
1196                                "same brw?\n", p1->flag, p2->flag);
1197                 return 0;
1198         }
1199
1200         return (p1->off + p1->count == p2->off);
1201 }
1202
1203 static obd_count osc_checksum_bulk(int nob, obd_count pg_count,
1204                                    struct brw_page **pga, int opc,
1205                                    cksum_type_t cksum_type)
1206 {
1207         __u32 cksum;
1208         int i = 0;
1209
1210         LASSERT (pg_count > 0);
1211         cksum = init_checksum(cksum_type);
1212         while (nob > 0 && pg_count > 0) {
1213                 unsigned char *ptr = cfs_kmap(pga[i]->pg);
1214                 int off = pga[i]->off & ~CFS_PAGE_MASK;
1215                 int count = pga[i]->count > nob ? nob : pga[i]->count;
1216
1217                 /* corrupt the data before we compute the checksum, to
1218                  * simulate an OST->client data error */
1219                 if (i == 0 && opc == OST_READ &&
1220                     OBD_FAIL_CHECK(OBD_FAIL_OSC_CHECKSUM_RECEIVE))
1221                         memcpy(ptr + off, "bad1", min(4, nob));
1222                 cksum = compute_checksum(cksum, ptr + off, count, cksum_type);
1223                 cfs_kunmap(pga[i]->pg);
1224                 LL_CDEBUG_PAGE(D_PAGE, pga[i]->pg, "off %d checksum %x\n",
1225                                off, cksum);
1226
1227                 nob -= pga[i]->count;
1228                 pg_count--;
1229                 i++;
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 {
1245         struct ptlrpc_request   *req;
1246         struct ptlrpc_bulk_desc *desc;
1247         struct ost_body         *body;
1248         struct obd_ioobj        *ioobj;
1249         struct niobuf_remote    *niobuf;
1250         int niocount, i, requested_nob, opc, rc;
1251         struct osc_brw_async_args *aa;
1252         struct req_capsule      *pill;
1253         struct brw_page *pg_prev;
1254
1255         ENTRY;
1256         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_BRW_PREP_REQ))
1257                 RETURN(-ENOMEM); /* Recoverable */
1258         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_BRW_PREP_REQ2))
1259                 RETURN(-EINVAL); /* Fatal */
1260
1261         if ((cmd & OBD_BRW_WRITE) != 0) {
1262                 opc = OST_WRITE;
1263                 req = ptlrpc_request_alloc_pool(cli->cl_import,
1264                                                 cli->cl_import->imp_rq_pool,
1265                                                 &RQF_OST_BRW_WRITE);
1266         } else {
1267                 opc = OST_READ;
1268                 req = ptlrpc_request_alloc(cli->cl_import, &RQF_OST_BRW_READ);
1269         }
1270         if (req == NULL)
1271                 RETURN(-ENOMEM);
1272
1273         for (niocount = i = 1; i < page_count; i++) {
1274                 if (!can_merge_pages(pga[i - 1], pga[i]))
1275                         niocount++;
1276         }
1277
1278         pill = &req->rq_pill;
1279         req_capsule_set_size(pill, &RMF_OBD_IOOBJ, RCL_CLIENT,
1280                              sizeof(*ioobj));
1281         req_capsule_set_size(pill, &RMF_NIOBUF_REMOTE, RCL_CLIENT,
1282                              niocount * sizeof(*niobuf));
1283         osc_set_capa_size(req, &RMF_CAPA1, ocapa);
1284
1285         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, opc);
1286         if (rc) {
1287                 ptlrpc_request_free(req);
1288                 RETURN(rc);
1289         }
1290         req->rq_request_portal = OST_IO_PORTAL; /* bug 7198 */
1291         ptlrpc_at_set_req_timeout(req);
1292
1293         if (opc == OST_WRITE)
1294                 desc = ptlrpc_prep_bulk_imp(req, page_count,
1295                                             BULK_GET_SOURCE, OST_BULK_PORTAL);
1296         else
1297                 desc = ptlrpc_prep_bulk_imp(req, page_count,
1298                                             BULK_PUT_SINK, OST_BULK_PORTAL);
1299
1300         if (desc == NULL)
1301                 GOTO(out, rc = -ENOMEM);
1302         /* NB request now owns desc and will free it when it gets freed */
1303
1304         body = req_capsule_client_get(pill, &RMF_OST_BODY);
1305         ioobj = req_capsule_client_get(pill, &RMF_OBD_IOOBJ);
1306         niobuf = req_capsule_client_get(pill, &RMF_NIOBUF_REMOTE);
1307         LASSERT(body != NULL && ioobj != NULL && niobuf != NULL);
1308
1309         lustre_set_wire_obdo(&body->oa, oa);
1310
1311         obdo_to_ioobj(oa, ioobj);
1312         ioobj->ioo_bufcnt = niocount;
1313         osc_pack_capa(req, body, ocapa);
1314         LASSERT (page_count > 0);
1315         pg_prev = pga[0];
1316         for (requested_nob = i = 0; i < page_count; i++, niobuf++) {
1317                 struct brw_page *pg = pga[i];
1318
1319                 LASSERT(pg->count > 0);
1320                 LASSERTF((pg->off & ~CFS_PAGE_MASK) + pg->count <= CFS_PAGE_SIZE,
1321                          "i: %d pg: %p off: "LPU64", count: %u\n", i, pg,
1322                          pg->off, pg->count);
1323 #ifdef __linux__
1324                 LASSERTF(i == 0 || pg->off > pg_prev->off,
1325                          "i %d p_c %u pg %p [pri %lu ind %lu] off "LPU64
1326                          " prev_pg %p [pri %lu ind %lu] off "LPU64"\n",
1327                          i, page_count,
1328                          pg->pg, page_private(pg->pg), pg->pg->index, pg->off,
1329                          pg_prev->pg, page_private(pg_prev->pg),
1330                          pg_prev->pg->index, pg_prev->off);
1331 #else
1332                 LASSERTF(i == 0 || pg->off > pg_prev->off,
1333                          "i %d p_c %u\n", i, page_count);
1334 #endif
1335                 LASSERT((pga[0]->flag & OBD_BRW_SRVLOCK) ==
1336                         (pg->flag & OBD_BRW_SRVLOCK));
1337
1338                 ptlrpc_prep_bulk_page(desc, pg->pg, pg->off & ~CFS_PAGE_MASK,
1339                                       pg->count);
1340                 requested_nob += pg->count;
1341
1342                 if (i > 0 && can_merge_pages(pg_prev, pg)) {
1343                         niobuf--;
1344                         niobuf->len += pg->count;
1345                 } else {
1346                         niobuf->offset = pg->off;
1347                         niobuf->len    = pg->count;
1348                         niobuf->flags  = pg->flag;
1349                 }
1350                 pg_prev = pg;
1351         }
1352
1353         LASSERTF((void *)(niobuf - niocount) ==
1354                 req_capsule_client_get(&req->rq_pill, &RMF_NIOBUF_REMOTE),
1355                 "want %p - real %p\n", req_capsule_client_get(&req->rq_pill,
1356                 &RMF_NIOBUF_REMOTE), (void *)(niobuf - niocount));
1357
1358         osc_announce_cached(cli, &body->oa, opc == OST_WRITE ? requested_nob:0);
1359         if (osc_should_shrink_grant(cli))
1360                 osc_shrink_grant_local(cli, &body->oa);
1361
1362         /* size[REQ_REC_OFF] still sizeof (*body) */
1363         if (opc == OST_WRITE) {
1364                 if (unlikely(cli->cl_checksum) &&
1365                     !sptlrpc_flavor_has_bulk(&req->rq_flvr)) {
1366                         /* store cl_cksum_type in a local variable since
1367                          * it can be changed via lprocfs */
1368                         cksum_type_t cksum_type = cli->cl_cksum_type;
1369
1370                         if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0) {
1371                                 oa->o_flags &= OBD_FL_LOCAL_MASK;
1372                                 body->oa.o_flags = 0;
1373                         }
1374                         body->oa.o_flags |= cksum_type_pack(cksum_type);
1375                         body->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1376                         body->oa.o_cksum = osc_checksum_bulk(requested_nob,
1377                                                              page_count, pga,
1378                                                              OST_WRITE,
1379                                                              cksum_type);
1380                         CDEBUG(D_PAGE, "checksum at write origin: %x\n",
1381                                body->oa.o_cksum);
1382                         /* save this in 'oa', too, for later checking */
1383                         oa->o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1384                         oa->o_flags |= cksum_type_pack(cksum_type);
1385                 } else {
1386                         /* clear out the checksum flag, in case this is a
1387                          * resend but cl_checksum is no longer set. b=11238 */
1388                         oa->o_valid &= ~OBD_MD_FLCKSUM;
1389                 }
1390                 oa->o_cksum = body->oa.o_cksum;
1391                 /* 1 RC per niobuf */
1392                 req_capsule_set_size(pill, &RMF_RCS, RCL_SERVER,
1393                                      sizeof(__u32) * niocount);
1394         } else {
1395                 if (unlikely(cli->cl_checksum) &&
1396                     !sptlrpc_flavor_has_bulk(&req->rq_flvr)) {
1397                         if ((body->oa.o_valid & OBD_MD_FLFLAGS) == 0)
1398                                 body->oa.o_flags = 0;
1399                         body->oa.o_flags |= cksum_type_pack(cli->cl_cksum_type);
1400                         body->oa.o_valid |= OBD_MD_FLCKSUM | OBD_MD_FLFLAGS;
1401                 }
1402         }
1403         ptlrpc_request_set_replen(req);
1404
1405         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
1406         aa = ptlrpc_req_async_args(req);
1407         aa->aa_oa = oa;
1408         aa->aa_requested_nob = requested_nob;
1409         aa->aa_nio_count = niocount;
1410         aa->aa_page_count = page_count;
1411         aa->aa_resends = 0;
1412         aa->aa_ppga = pga;
1413         aa->aa_cli = cli;
1414         CFS_INIT_LIST_HEAD(&aa->aa_oaps);
1415         if (ocapa && reserve)
1416                 aa->aa_ocapa = capa_get(ocapa);
1417
1418         *reqp = req;
1419         RETURN(0);
1420
1421  out:
1422         ptlrpc_req_finished(req);
1423         RETURN(rc);
1424 }
1425
1426 static int check_write_checksum(struct obdo *oa, const lnet_process_id_t *peer,
1427                                 __u32 client_cksum, __u32 server_cksum, int nob,
1428                                 obd_count page_count, struct brw_page **pga,
1429                                 cksum_type_t client_cksum_type)
1430 {
1431         __u32 new_cksum;
1432         char *msg;
1433         cksum_type_t cksum_type;
1434
1435         if (server_cksum == client_cksum) {
1436                 CDEBUG(D_PAGE, "checksum %x confirmed\n", client_cksum);
1437                 return 0;
1438         }
1439
1440         /* If this is mmaped file - it can be changed at any time */
1441         if (oa->o_valid & OBD_MD_FLFLAGS && oa->o_flags & OBD_FL_MMAP)
1442                 return 1;
1443
1444         if (oa->o_valid & OBD_MD_FLFLAGS)
1445                 cksum_type = cksum_type_unpack(oa->o_flags);
1446         else
1447                 cksum_type = OBD_CKSUM_CRC32;
1448
1449         new_cksum = osc_checksum_bulk(nob, page_count, pga, OST_WRITE,
1450                                       cksum_type);
1451
1452         if (cksum_type != client_cksum_type)
1453                 msg = "the server did not use the checksum type specified in "
1454                       "the original request - likely a protocol problem";
1455         else if (new_cksum == server_cksum)
1456                 msg = "changed on the client after we checksummed it - "
1457                       "likely false positive due to mmap IO (bug 11742)";
1458         else if (new_cksum == client_cksum)
1459                 msg = "changed in transit before arrival at OST";
1460         else
1461                 msg = "changed in transit AND doesn't match the original - "
1462                       "likely false positive due to mmap IO (bug 11742)";
1463
1464         LCONSOLE_ERROR_MSG(0x132, "BAD WRITE CHECKSUM: %s: from %s inode "DFID
1465                            " object "LPU64"/"LPU64" extent ["LPU64"-"LPU64"]\n",
1466                            msg, libcfs_nid2str(peer->nid),
1467                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_seq : (__u64)0,
1468                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_oid : 0,
1469                            oa->o_valid & OBD_MD_FLFID ? oa->o_parent_ver : 0,
1470                            oa->o_id,
1471                            oa->o_valid & OBD_MD_FLGROUP ? oa->o_seq : (__u64)0,
1472                            pga[0]->off,
1473                            pga[page_count-1]->off + pga[page_count-1]->count - 1);
1474         CERROR("original client csum %x (type %x), server csum %x (type %x), "
1475                "client csum now %x\n", client_cksum, client_cksum_type,
1476                server_cksum, cksum_type, new_cksum);
1477         return 1;
1478 }
1479
1480 /* Note rc enters this function as number of bytes transferred */
1481 static int osc_brw_fini_request(struct ptlrpc_request *req, int rc)
1482 {
1483         struct osc_brw_async_args *aa = (void *)&req->rq_async_args;
1484         const lnet_process_id_t *peer =
1485                         &req->rq_import->imp_connection->c_peer;
1486         struct client_obd *cli = aa->aa_cli;
1487         struct ost_body *body;
1488         __u32 client_cksum = 0;
1489         ENTRY;
1490
1491         if (rc < 0 && rc != -EDQUOT) {
1492                 DEBUG_REQ(D_INFO, req, "Failed request with rc = %d\n", rc);
1493                 RETURN(rc);
1494         }
1495
1496         LASSERTF(req->rq_repmsg != NULL, "rc = %d\n", rc);
1497         body = req_capsule_server_get(&req->rq_pill, &RMF_OST_BODY);
1498         if (body == NULL) {
1499                 DEBUG_REQ(D_INFO, req, "Can't unpack body\n");
1500                 RETURN(-EPROTO);
1501         }
1502
1503 #ifdef HAVE_QUOTA_SUPPORT
1504         /* set/clear over quota flag for a uid/gid */
1505         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE &&
1506             body->oa.o_valid & (OBD_MD_FLUSRQUOTA | OBD_MD_FLGRPQUOTA)) {
1507                 unsigned int qid[MAXQUOTAS] = { body->oa.o_uid, body->oa.o_gid };
1508
1509                 CDEBUG(D_QUOTA, "setdq for [%u %u] with valid "LPX64", flags %x\n",
1510                        body->oa.o_uid, body->oa.o_gid, body->oa.o_valid,
1511                        body->oa.o_flags);
1512                 lquota_setdq(quota_interface, cli, qid, body->oa.o_valid,
1513                              body->oa.o_flags);
1514         }
1515 #endif
1516
1517         osc_update_grant(cli, body);
1518
1519         if (rc < 0)
1520                 RETURN(rc);
1521
1522         if (aa->aa_oa->o_valid & OBD_MD_FLCKSUM)
1523                 client_cksum = aa->aa_oa->o_cksum; /* save for later */
1524
1525         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE) {
1526                 if (rc > 0) {
1527                         CERROR("Unexpected +ve rc %d\n", rc);
1528                         RETURN(-EPROTO);
1529                 }
1530                 LASSERT(req->rq_bulk->bd_nob == aa->aa_requested_nob);
1531
1532                 if (sptlrpc_cli_unwrap_bulk_write(req, req->rq_bulk))
1533                         RETURN(-EAGAIN);
1534
1535                 if ((aa->aa_oa->o_valid & OBD_MD_FLCKSUM) && client_cksum &&
1536                     check_write_checksum(&body->oa, peer, client_cksum,
1537                                          body->oa.o_cksum, aa->aa_requested_nob,
1538                                          aa->aa_page_count, aa->aa_ppga,
1539                                          cksum_type_unpack(aa->aa_oa->o_flags)))
1540                         RETURN(-EAGAIN);
1541
1542                 rc = check_write_rcs(req, aa->aa_requested_nob,aa->aa_nio_count,
1543                                      aa->aa_page_count, aa->aa_ppga);
1544                 GOTO(out, rc);
1545         }
1546
1547         /* The rest of this function executes only for OST_READs */
1548
1549         /* if unwrap_bulk failed, return -EAGAIN to retry */
1550         rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, rc);
1551         if (rc < 0)
1552                 GOTO(out, rc = -EAGAIN);
1553
1554         if (rc > aa->aa_requested_nob) {
1555                 CERROR("Unexpected rc %d (%d requested)\n", rc,
1556                        aa->aa_requested_nob);
1557                 RETURN(-EPROTO);
1558         }
1559
1560         if (rc != req->rq_bulk->bd_nob_transferred) {
1561                 CERROR ("Unexpected rc %d (%d transferred)\n",
1562                         rc, req->rq_bulk->bd_nob_transferred);
1563                 return (-EPROTO);
1564         }
1565
1566         if (rc < aa->aa_requested_nob)
1567                 handle_short_read(rc, aa->aa_page_count, aa->aa_ppga);
1568
1569         if (body->oa.o_valid & OBD_MD_FLCKSUM) {
1570                 static int cksum_counter;
1571                 __u32      server_cksum = body->oa.o_cksum;
1572                 char      *via;
1573                 char      *router;
1574                 cksum_type_t cksum_type;
1575
1576                 if (body->oa.o_valid & OBD_MD_FLFLAGS)
1577                         cksum_type = cksum_type_unpack(body->oa.o_flags);
1578                 else
1579                         cksum_type = OBD_CKSUM_CRC32;
1580                 client_cksum = osc_checksum_bulk(rc, aa->aa_page_count,
1581                                                  aa->aa_ppga, OST_READ,
1582                                                  cksum_type);
1583
1584                 if (peer->nid == req->rq_bulk->bd_sender) {
1585                         via = router = "";
1586                 } else {
1587                         via = " via ";
1588                         router = libcfs_nid2str(req->rq_bulk->bd_sender);
1589                 }
1590
1591                 if (server_cksum == ~0 && rc > 0) {
1592                         CERROR("Protocol error: server %s set the 'checksum' "
1593                                "bit, but didn't send a checksum.  Not fatal, "
1594                                "but please notify on http://bugzilla.lustre.org/\n",
1595                                libcfs_nid2str(peer->nid));
1596                 } else if (server_cksum != client_cksum) {
1597                         LCONSOLE_ERROR_MSG(0x133, "%s: BAD READ CHECKSUM: from "
1598                                            "%s%s%s inode "DFID" object "
1599                                            LPU64"/"LPU64" extent "
1600                                            "["LPU64"-"LPU64"]\n",
1601                                            req->rq_import->imp_obd->obd_name,
1602                                            libcfs_nid2str(peer->nid),
1603                                            via, router,
1604                                            body->oa.o_valid & OBD_MD_FLFID ?
1605                                                 body->oa.o_parent_seq : (__u64)0,
1606                                            body->oa.o_valid & OBD_MD_FLFID ?
1607                                                 body->oa.o_parent_oid : 0,
1608                                            body->oa.o_valid & OBD_MD_FLFID ?
1609                                                 body->oa.o_parent_ver : 0,
1610                                            body->oa.o_id,
1611                                            body->oa.o_valid & OBD_MD_FLGROUP ?
1612                                                 body->oa.o_seq : (__u64)0,
1613                                            aa->aa_ppga[0]->off,
1614                                            aa->aa_ppga[aa->aa_page_count-1]->off +
1615                                            aa->aa_ppga[aa->aa_page_count-1]->count -
1616                                                                         1);
1617                         CERROR("client %x, server %x, cksum_type %x\n",
1618                                client_cksum, server_cksum, cksum_type);
1619                         cksum_counter = 0;
1620                         aa->aa_oa->o_cksum = client_cksum;
1621                         rc = -EAGAIN;
1622                 } else {
1623                         cksum_counter++;
1624                         CDEBUG(D_PAGE, "checksum %x confirmed\n", client_cksum);
1625                         rc = 0;
1626                 }
1627         } else if (unlikely(client_cksum)) {
1628                 static int cksum_missed;
1629
1630                 cksum_missed++;
1631                 if ((cksum_missed & (-cksum_missed)) == cksum_missed)
1632                         CERROR("Checksum %u requested from %s but not sent\n",
1633                                cksum_missed, libcfs_nid2str(peer->nid));
1634         } else {
1635                 rc = 0;
1636         }
1637 out:
1638         if (rc >= 0)
1639                 lustre_get_wire_obdo(aa->aa_oa, &body->oa);
1640
1641         RETURN(rc);
1642 }
1643
1644 static int osc_brw_internal(int cmd, struct obd_export *exp, struct obdo *oa,
1645                             struct lov_stripe_md *lsm,
1646                             obd_count page_count, struct brw_page **pga,
1647                             struct obd_capa *ocapa)
1648 {
1649         struct ptlrpc_request *req;
1650         int                    rc;
1651         cfs_waitq_t            waitq;
1652         int                    resends = 0;
1653         struct l_wait_info     lwi;
1654
1655         ENTRY;
1656
1657         cfs_waitq_init(&waitq);
1658
1659 restart_bulk:
1660         rc = osc_brw_prep_request(cmd, &exp->exp_obd->u.cli, oa, lsm,
1661                                   page_count, pga, &req, ocapa, 0);
1662         if (rc != 0)
1663                 return (rc);
1664
1665         rc = ptlrpc_queue_wait(req);
1666
1667         if (rc == -ETIMEDOUT && req->rq_resend) {
1668                 DEBUG_REQ(D_HA, req,  "BULK TIMEOUT");
1669                 ptlrpc_req_finished(req);
1670                 goto restart_bulk;
1671         }
1672
1673         rc = osc_brw_fini_request(req, rc);
1674
1675         ptlrpc_req_finished(req);
1676         if (osc_recoverable_error(rc)) {
1677                 resends++;
1678                 if (!osc_should_resend(resends, &exp->exp_obd->u.cli)) {
1679                         CERROR("too many resend retries, returning error\n");
1680                         RETURN(-EIO);
1681                 }
1682
1683                 lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(resends), NULL, NULL, NULL);
1684                 l_wait_event(waitq, 0, &lwi);
1685
1686                 goto restart_bulk;
1687         }
1688
1689         RETURN (rc);
1690 }
1691
1692 int osc_brw_redo_request(struct ptlrpc_request *request,
1693                          struct osc_brw_async_args *aa)
1694 {
1695         struct ptlrpc_request *new_req;
1696         struct ptlrpc_request_set *set = request->rq_set;
1697         struct osc_brw_async_args *new_aa;
1698         struct osc_async_page *oap;
1699         int rc = 0;
1700         ENTRY;
1701
1702         if (!osc_should_resend(aa->aa_resends, aa->aa_cli)) {
1703                 CERROR("too many resent retries, returning error\n");
1704                 RETURN(-EIO);
1705         }
1706
1707         DEBUG_REQ(D_ERROR, request, "redo for recoverable error");
1708
1709         rc = osc_brw_prep_request(lustre_msg_get_opc(request->rq_reqmsg) ==
1710                                         OST_WRITE ? OBD_BRW_WRITE :OBD_BRW_READ,
1711                                   aa->aa_cli, aa->aa_oa,
1712                                   NULL /* lsm unused by osc currently */,
1713                                   aa->aa_page_count, aa->aa_ppga,
1714                                   &new_req, aa->aa_ocapa, 0);
1715         if (rc)
1716                 RETURN(rc);
1717
1718         client_obd_list_lock(&aa->aa_cli->cl_loi_list_lock);
1719
1720         cfs_list_for_each_entry(oap, &aa->aa_oaps, oap_rpc_item) {
1721                 if (oap->oap_request != NULL) {
1722                         LASSERTF(request == oap->oap_request,
1723                                  "request %p != oap_request %p\n",
1724                                  request, oap->oap_request);
1725                         if (oap->oap_interrupted) {
1726                                 client_obd_list_unlock(&aa->aa_cli->cl_loi_list_lock);
1727                                 ptlrpc_req_finished(new_req);
1728                                 RETURN(-EINTR);
1729                         }
1730                 }
1731         }
1732         /* New request takes over pga and oaps from old request.
1733          * Note that copying a list_head doesn't work, need to move it... */
1734         aa->aa_resends++;
1735         new_req->rq_interpret_reply = request->rq_interpret_reply;
1736         new_req->rq_async_args = request->rq_async_args;
1737         new_req->rq_sent = cfs_time_current_sec() + aa->aa_resends;
1738
1739         new_aa = ptlrpc_req_async_args(new_req);
1740
1741         CFS_INIT_LIST_HEAD(&new_aa->aa_oaps);
1742         cfs_list_splice(&aa->aa_oaps, &new_aa->aa_oaps);
1743         CFS_INIT_LIST_HEAD(&aa->aa_oaps);
1744
1745         cfs_list_for_each_entry(oap, &new_aa->aa_oaps, oap_rpc_item) {
1746                 if (oap->oap_request) {
1747                         ptlrpc_req_finished(oap->oap_request);
1748                         oap->oap_request = ptlrpc_request_addref(new_req);
1749                 }
1750         }
1751
1752         new_aa->aa_ocapa = aa->aa_ocapa;
1753         aa->aa_ocapa = NULL;
1754
1755         /* use ptlrpc_set_add_req is safe because interpret functions work
1756          * in check_set context. only one way exist with access to request
1757          * from different thread got -EINTR - this way protected with
1758          * cl_loi_list_lock */
1759         ptlrpc_set_add_req(set, new_req);
1760
1761         client_obd_list_unlock(&aa->aa_cli->cl_loi_list_lock);
1762
1763         DEBUG_REQ(D_INFO, new_req, "new request");
1764         RETURN(0);
1765 }
1766
1767 /*
1768  * ugh, we want disk allocation on the target to happen in offset order.  we'll
1769  * follow sedgewicks advice and stick to the dead simple shellsort -- it'll do
1770  * fine for our small page arrays and doesn't require allocation.  its an
1771  * insertion sort that swaps elements that are strides apart, shrinking the
1772  * stride down until its '1' and the array is sorted.
1773  */
1774 static void sort_brw_pages(struct brw_page **array, int num)
1775 {
1776         int stride, i, j;
1777         struct brw_page *tmp;
1778
1779         if (num == 1)
1780                 return;
1781         for (stride = 1; stride < num ; stride = (stride * 3) + 1)
1782                 ;
1783
1784         do {
1785                 stride /= 3;
1786                 for (i = stride ; i < num ; i++) {
1787                         tmp = array[i];
1788                         j = i;
1789                         while (j >= stride && array[j - stride]->off > tmp->off) {
1790                                 array[j] = array[j - stride];
1791                                 j -= stride;
1792                         }
1793                         array[j] = tmp;
1794                 }
1795         } while (stride > 1);
1796 }
1797
1798 static obd_count max_unfragmented_pages(struct brw_page **pg, obd_count pages)
1799 {
1800         int count = 1;
1801         int offset;
1802         int i = 0;
1803
1804         LASSERT (pages > 0);
1805         offset = pg[i]->off & ~CFS_PAGE_MASK;
1806
1807         for (;;) {
1808                 pages--;
1809                 if (pages == 0)         /* that's all */
1810                         return count;
1811
1812                 if (offset + pg[i]->count < CFS_PAGE_SIZE)
1813                         return count;   /* doesn't end on page boundary */
1814
1815                 i++;
1816                 offset = pg[i]->off & ~CFS_PAGE_MASK;
1817                 if (offset != 0)        /* doesn't start on page boundary */
1818                         return count;
1819
1820                 count++;
1821         }
1822 }
1823
1824 static struct brw_page **osc_build_ppga(struct brw_page *pga, obd_count count)
1825 {
1826         struct brw_page **ppga;
1827         int i;
1828
1829         OBD_ALLOC(ppga, sizeof(*ppga) * count);
1830         if (ppga == NULL)
1831                 return NULL;
1832
1833         for (i = 0; i < count; i++)
1834                 ppga[i] = pga + i;
1835         return ppga;
1836 }
1837
1838 static void osc_release_ppga(struct brw_page **ppga, obd_count count)
1839 {
1840         LASSERT(ppga != NULL);
1841         OBD_FREE(ppga, sizeof(*ppga) * count);
1842 }
1843
1844 static int osc_brw(int cmd, struct obd_export *exp, struct obd_info *oinfo,
1845                    obd_count page_count, struct brw_page *pga,
1846                    struct obd_trans_info *oti)
1847 {
1848         struct obdo *saved_oa = NULL;
1849         struct brw_page **ppga, **orig;
1850         struct obd_import *imp = class_exp2cliimp(exp);
1851         struct client_obd *cli;
1852         int rc, page_count_orig;
1853         ENTRY;
1854
1855         LASSERT((imp != NULL) && (imp->imp_obd != NULL));
1856         cli = &imp->imp_obd->u.cli;
1857
1858         if (cmd & OBD_BRW_CHECK) {
1859                 /* The caller just wants to know if there's a chance that this
1860                  * I/O can succeed */
1861
1862                 if (imp->imp_invalid)
1863                         RETURN(-EIO);
1864                 RETURN(0);
1865         }
1866
1867         /* test_brw with a failed create can trip this, maybe others. */
1868         LASSERT(cli->cl_max_pages_per_rpc);
1869
1870         rc = 0;
1871
1872         orig = ppga = osc_build_ppga(pga, page_count);
1873         if (ppga == NULL)
1874                 RETURN(-ENOMEM);
1875         page_count_orig = page_count;
1876
1877         sort_brw_pages(ppga, page_count);
1878         while (page_count) {
1879                 obd_count pages_per_brw;
1880
1881                 if (page_count > cli->cl_max_pages_per_rpc)
1882                         pages_per_brw = cli->cl_max_pages_per_rpc;
1883                 else
1884                         pages_per_brw = page_count;
1885
1886                 pages_per_brw = max_unfragmented_pages(ppga, pages_per_brw);
1887
1888                 if (saved_oa != NULL) {
1889                         /* restore previously saved oa */
1890                         *oinfo->oi_oa = *saved_oa;
1891                 } else if (page_count > pages_per_brw) {
1892                         /* save a copy of oa (brw will clobber it) */
1893                         OBDO_ALLOC(saved_oa);
1894                         if (saved_oa == NULL)
1895                                 GOTO(out, rc = -ENOMEM);
1896                         *saved_oa = *oinfo->oi_oa;
1897                 }
1898
1899                 rc = osc_brw_internal(cmd, exp, oinfo->oi_oa, oinfo->oi_md,
1900                                       pages_per_brw, ppga, oinfo->oi_capa);
1901
1902                 if (rc != 0)
1903                         break;
1904
1905                 page_count -= pages_per_brw;
1906                 ppga += pages_per_brw;
1907         }
1908
1909 out:
1910         osc_release_ppga(orig, page_count_orig);
1911
1912         if (saved_oa != NULL)
1913                 OBDO_FREE(saved_oa);
1914
1915         RETURN(rc);
1916 }
1917
1918 /* The companion to osc_enter_cache(), called when @oap is no longer part of
1919  * the dirty accounting.  Writeback completes or truncate happens before
1920  * writing starts.  Must be called with the loi lock held. */
1921 static void osc_exit_cache(struct client_obd *cli, struct osc_async_page *oap,
1922                            int sent)
1923 {
1924         osc_release_write_grant(cli, &oap->oap_brw_page, sent);
1925 }
1926
1927
1928 /* This maintains the lists of pending pages to read/write for a given object
1929  * (lop).  This is used by osc_check_rpcs->osc_next_loi() and loi_list_maint()
1930  * to quickly find objects that are ready to send an RPC. */
1931 static int lop_makes_rpc(struct client_obd *cli, struct loi_oap_pages *lop,
1932                          int cmd)
1933 {
1934         int optimal;
1935         ENTRY;
1936
1937         if (lop->lop_num_pending == 0)
1938                 RETURN(0);
1939
1940         /* if we have an invalid import we want to drain the queued pages
1941          * by forcing them through rpcs that immediately fail and complete
1942          * the pages.  recovery relies on this to empty the queued pages
1943          * before canceling the locks and evicting down the llite pages */
1944         if (cli->cl_import == NULL || cli->cl_import->imp_invalid)
1945                 RETURN(1);
1946
1947         /* stream rpcs in queue order as long as as there is an urgent page
1948          * queued.  this is our cheap solution for good batching in the case
1949          * where writepage marks some random page in the middle of the file
1950          * as urgent because of, say, memory pressure */
1951         if (!cfs_list_empty(&lop->lop_urgent)) {
1952                 CDEBUG(D_CACHE, "urgent request forcing RPC\n");
1953                 RETURN(1);
1954         }
1955         /* fire off rpcs when we have 'optimal' rpcs as tuned for the wire. */
1956         optimal = cli->cl_max_pages_per_rpc;
1957         if (cmd & OBD_BRW_WRITE) {
1958                 /* trigger a write rpc stream as long as there are dirtiers
1959                  * waiting for space.  as they're waiting, they're not going to
1960                  * create more pages to coalesce with what's waiting.. */
1961                 if (!cfs_list_empty(&cli->cl_cache_waiters)) {
1962                         CDEBUG(D_CACHE, "cache waiters forcing RPC\n");
1963                         RETURN(1);
1964                 }
1965                 /* +16 to avoid triggering rpcs that would want to include pages
1966                  * that are being queued but which can't be made ready until
1967                  * the queuer finishes with the page. this is a wart for
1968                  * llite::commit_write() */
1969                 optimal += 16;
1970         }
1971         if (lop->lop_num_pending >= optimal)
1972                 RETURN(1);
1973
1974         RETURN(0);
1975 }
1976
1977 static int lop_makes_hprpc(struct loi_oap_pages *lop)
1978 {
1979         struct osc_async_page *oap;
1980         ENTRY;
1981
1982         if (cfs_list_empty(&lop->lop_urgent))
1983                 RETURN(0);
1984
1985         oap = cfs_list_entry(lop->lop_urgent.next,
1986                          struct osc_async_page, oap_urgent_item);
1987
1988         if (oap->oap_async_flags & ASYNC_HP) {
1989                 CDEBUG(D_CACHE, "hp request forcing RPC\n");
1990                 RETURN(1);
1991         }
1992
1993         RETURN(0);
1994 }
1995
1996 static void on_list(cfs_list_t *item, cfs_list_t *list,
1997                     int should_be_on)
1998 {
1999         if (cfs_list_empty(item) && should_be_on)
2000                 cfs_list_add_tail(item, list);
2001         else if (!cfs_list_empty(item) && !should_be_on)
2002                 cfs_list_del_init(item);
2003 }
2004
2005 /* maintain the loi's cli list membership invariants so that osc_send_oap_rpc
2006  * can find pages to build into rpcs quickly */
2007 void loi_list_maint(struct client_obd *cli, struct lov_oinfo *loi)
2008 {
2009         if (lop_makes_hprpc(&loi->loi_write_lop) ||
2010             lop_makes_hprpc(&loi->loi_read_lop)) {
2011                 /* HP rpc */
2012                 on_list(&loi->loi_ready_item, &cli->cl_loi_ready_list, 0);
2013                 on_list(&loi->loi_hp_ready_item, &cli->cl_loi_hp_ready_list, 1);
2014         } else {
2015                 on_list(&loi->loi_hp_ready_item, &cli->cl_loi_hp_ready_list, 0);
2016                 on_list(&loi->loi_ready_item, &cli->cl_loi_ready_list,
2017                         lop_makes_rpc(cli, &loi->loi_write_lop, OBD_BRW_WRITE)||
2018                         lop_makes_rpc(cli, &loi->loi_read_lop, OBD_BRW_READ));
2019         }
2020
2021         on_list(&loi->loi_write_item, &cli->cl_loi_write_list,
2022                 loi->loi_write_lop.lop_num_pending);
2023
2024         on_list(&loi->loi_read_item, &cli->cl_loi_read_list,
2025                 loi->loi_read_lop.lop_num_pending);
2026 }
2027
2028 static void lop_update_pending(struct client_obd *cli,
2029                                struct loi_oap_pages *lop, int cmd, int delta)
2030 {
2031         lop->lop_num_pending += delta;
2032         if (cmd & OBD_BRW_WRITE)
2033                 cli->cl_pending_w_pages += delta;
2034         else
2035                 cli->cl_pending_r_pages += delta;
2036 }
2037
2038 /**
2039  * this is called when a sync waiter receives an interruption.  Its job is to
2040  * get the caller woken as soon as possible.  If its page hasn't been put in an
2041  * rpc yet it can dequeue immediately.  Otherwise it has to mark the rpc as
2042  * desiring interruption which will forcefully complete the rpc once the rpc
2043  * has timed out.
2044  */
2045 int osc_oap_interrupted(const struct lu_env *env, struct osc_async_page *oap)
2046 {
2047         struct loi_oap_pages *lop;
2048         struct lov_oinfo *loi;
2049         int rc = -EBUSY;
2050         ENTRY;
2051
2052         LASSERT(!oap->oap_interrupted);
2053         oap->oap_interrupted = 1;
2054
2055         /* ok, it's been put in an rpc. only one oap gets a request reference */
2056         if (oap->oap_request != NULL) {
2057                 ptlrpc_mark_interrupted(oap->oap_request);
2058                 ptlrpcd_wake(oap->oap_request);
2059                 ptlrpc_req_finished(oap->oap_request);
2060                 oap->oap_request = NULL;
2061         }
2062
2063         /*
2064          * page completion may be called only if ->cpo_prep() method was
2065          * executed by osc_io_submit(), that also adds page the to pending list
2066          */
2067         if (!cfs_list_empty(&oap->oap_pending_item)) {
2068                 cfs_list_del_init(&oap->oap_pending_item);
2069                 cfs_list_del_init(&oap->oap_urgent_item);
2070
2071                 loi = oap->oap_loi;
2072                 lop = (oap->oap_cmd & OBD_BRW_WRITE) ?
2073                         &loi->loi_write_lop : &loi->loi_read_lop;
2074                 lop_update_pending(oap->oap_cli, lop, oap->oap_cmd, -1);
2075                 loi_list_maint(oap->oap_cli, oap->oap_loi);
2076                 rc = oap->oap_caller_ops->ap_completion(env,
2077                                           oap->oap_caller_data,
2078                                           oap->oap_cmd, NULL, -EINTR);
2079         }
2080
2081         RETURN(rc);
2082 }
2083
2084 /* this is trying to propogate async writeback errors back up to the
2085  * application.  As an async write fails we record the error code for later if
2086  * the app does an fsync.  As long as errors persist we force future rpcs to be
2087  * sync so that the app can get a sync error and break the cycle of queueing
2088  * pages for which writeback will fail. */
2089 static void osc_process_ar(struct osc_async_rc *ar, __u64 xid,
2090                            int rc)
2091 {
2092         if (rc) {
2093                 if (!ar->ar_rc)
2094                         ar->ar_rc = rc;
2095
2096                 ar->ar_force_sync = 1;
2097                 ar->ar_min_xid = ptlrpc_sample_next_xid();
2098                 return;
2099
2100         }
2101
2102         if (ar->ar_force_sync && (xid >= ar->ar_min_xid))
2103                 ar->ar_force_sync = 0;
2104 }
2105
2106 void osc_oap_to_pending(struct osc_async_page *oap)
2107 {
2108         struct loi_oap_pages *lop;
2109
2110         if (oap->oap_cmd & OBD_BRW_WRITE)
2111                 lop = &oap->oap_loi->loi_write_lop;
2112         else
2113                 lop = &oap->oap_loi->loi_read_lop;
2114
2115         if (oap->oap_async_flags & ASYNC_HP)
2116                 cfs_list_add(&oap->oap_urgent_item, &lop->lop_urgent);
2117         else if (oap->oap_async_flags & ASYNC_URGENT)
2118                 cfs_list_add_tail(&oap->oap_urgent_item, &lop->lop_urgent);
2119         cfs_list_add_tail(&oap->oap_pending_item, &lop->lop_pending);
2120         lop_update_pending(oap->oap_cli, lop, oap->oap_cmd, 1);
2121 }
2122
2123 /* this must be called holding the loi list lock to give coverage to exit_cache,
2124  * async_flag maintenance, and oap_request */
2125 static void osc_ap_completion(const struct lu_env *env,
2126                               struct client_obd *cli, struct obdo *oa,
2127                               struct osc_async_page *oap, int sent, int rc)
2128 {
2129         __u64 xid = 0;
2130
2131         ENTRY;
2132         if (oap->oap_request != NULL) {
2133                 xid = ptlrpc_req_xid(oap->oap_request);
2134                 ptlrpc_req_finished(oap->oap_request);
2135                 oap->oap_request = NULL;
2136         }
2137
2138         cfs_spin_lock(&oap->oap_lock);
2139         oap->oap_async_flags = 0;
2140         cfs_spin_unlock(&oap->oap_lock);
2141         oap->oap_interrupted = 0;
2142
2143         if (oap->oap_cmd & OBD_BRW_WRITE) {
2144                 osc_process_ar(&cli->cl_ar, xid, rc);
2145                 osc_process_ar(&oap->oap_loi->loi_ar, xid, rc);
2146         }
2147
2148         if (rc == 0 && oa != NULL) {
2149                 if (oa->o_valid & OBD_MD_FLBLOCKS)
2150                         oap->oap_loi->loi_lvb.lvb_blocks = oa->o_blocks;
2151                 if (oa->o_valid & OBD_MD_FLMTIME)
2152                         oap->oap_loi->loi_lvb.lvb_mtime = oa->o_mtime;
2153                 if (oa->o_valid & OBD_MD_FLATIME)
2154                         oap->oap_loi->loi_lvb.lvb_atime = oa->o_atime;
2155                 if (oa->o_valid & OBD_MD_FLCTIME)
2156                         oap->oap_loi->loi_lvb.lvb_ctime = oa->o_ctime;
2157         }
2158
2159         rc = oap->oap_caller_ops->ap_completion(env, oap->oap_caller_data,
2160                                                 oap->oap_cmd, oa, rc);
2161
2162         /* ll_ap_completion (from llite) drops PG_locked. so, a new
2163          * I/O on the page could start, but OSC calls it under lock
2164          * and thus we can add oap back to pending safely */
2165         if (rc)
2166                 /* upper layer wants to leave the page on pending queue */
2167                 osc_oap_to_pending(oap);
2168         else
2169                 osc_exit_cache(cli, oap, sent);
2170         EXIT;
2171 }
2172
2173 static int brw_interpret(const struct lu_env *env,
2174                          struct ptlrpc_request *req, void *data, int rc)
2175 {
2176         struct osc_brw_async_args *aa = data;
2177         struct client_obd *cli;
2178         int async;
2179         ENTRY;
2180
2181         rc = osc_brw_fini_request(req, rc);
2182         CDEBUG(D_INODE, "request %p aa %p rc %d\n", req, aa, rc);
2183         if (osc_recoverable_error(rc)) {
2184                 /* Only retry once for mmaped files since the mmaped page
2185                  * might be modified at anytime. We have to retry at least
2186                  * once in case there WAS really a corruption of the page
2187                  * on the network, that was not caused by mmap() modifying
2188                  * the page. Bug11742 */
2189                 if ((rc == -EAGAIN) && (aa->aa_resends > 0) &&
2190                     aa->aa_oa->o_valid & OBD_MD_FLFLAGS &&
2191                     aa->aa_oa->o_flags & OBD_FL_MMAP) {
2192                         rc = 0;
2193                 } else {
2194                         rc = osc_brw_redo_request(req, aa);
2195                         if (rc == 0)
2196                                 RETURN(0);
2197                 }
2198         }
2199
2200         if (aa->aa_ocapa) {
2201                 capa_put(aa->aa_ocapa);
2202                 aa->aa_ocapa = NULL;
2203         }
2204
2205         cli = aa->aa_cli;
2206
2207         client_obd_list_lock(&cli->cl_loi_list_lock);
2208
2209         /* We need to decrement before osc_ap_completion->osc_wake_cache_waiters
2210          * is called so we know whether to go to sync BRWs or wait for more
2211          * RPCs to complete */
2212         if (lustre_msg_get_opc(req->rq_reqmsg) == OST_WRITE)
2213                 cli->cl_w_in_flight--;
2214         else
2215                 cli->cl_r_in_flight--;
2216
2217         async = cfs_list_empty(&aa->aa_oaps);
2218         if (!async) { /* from osc_send_oap_rpc() */
2219                 struct osc_async_page *oap, *tmp;
2220                 /* the caller may re-use the oap after the completion call so
2221                  * we need to clean it up a little */
2222                 cfs_list_for_each_entry_safe(oap, tmp, &aa->aa_oaps,
2223                                              oap_rpc_item) {
2224                         cfs_list_del_init(&oap->oap_rpc_item);
2225                         osc_ap_completion(env, cli, aa->aa_oa, oap, 1, rc);
2226                 }
2227                 OBDO_FREE(aa->aa_oa);
2228         } else { /* from async_internal() */
2229                 obd_count i;
2230                 for (i = 0; i < aa->aa_page_count; i++)
2231                         osc_release_write_grant(aa->aa_cli, aa->aa_ppga[i], 1);
2232         }
2233         osc_wake_cache_waiters(cli);
2234         osc_check_rpcs(env, cli);
2235         client_obd_list_unlock(&cli->cl_loi_list_lock);
2236         if (!async)
2237                 cl_req_completion(env, aa->aa_clerq, rc);
2238         osc_release_ppga(aa->aa_ppga, aa->aa_page_count);
2239
2240         RETURN(rc);
2241 }
2242
2243 static struct ptlrpc_request *osc_build_req(const struct lu_env *env,
2244                                             struct client_obd *cli,
2245                                             cfs_list_t *rpc_list,
2246                                             int page_count, int cmd)
2247 {
2248         struct ptlrpc_request *req;
2249         struct brw_page **pga = NULL;
2250         struct osc_brw_async_args *aa;
2251         struct obdo *oa = NULL;
2252         const struct obd_async_page_ops *ops = NULL;
2253         void *caller_data = NULL;
2254         struct osc_async_page *oap;
2255         struct osc_async_page *tmp;
2256         struct ost_body *body;
2257         struct cl_req *clerq = NULL;
2258         enum cl_req_type crt = (cmd & OBD_BRW_WRITE) ? CRT_WRITE : CRT_READ;
2259         struct ldlm_lock *lock = NULL;
2260         struct cl_req_attr crattr;
2261         int i, rc, mpflag = 0;
2262
2263         ENTRY;
2264         LASSERT(!cfs_list_empty(rpc_list));
2265
2266         if (cmd & OBD_BRW_MEMALLOC)
2267                 mpflag = cfs_memory_pressure_get_and_set();
2268
2269         memset(&crattr, 0, sizeof crattr);
2270         OBD_ALLOC(pga, sizeof(*pga) * page_count);
2271         if (pga == NULL)
2272                 GOTO(out, req = ERR_PTR(-ENOMEM));
2273
2274         OBDO_ALLOC(oa);
2275         if (oa == NULL)
2276                 GOTO(out, req = ERR_PTR(-ENOMEM));
2277
2278         i = 0;
2279         cfs_list_for_each_entry(oap, rpc_list, oap_rpc_item) {
2280                 struct cl_page *page = osc_oap2cl_page(oap);
2281                 if (ops == NULL) {
2282                         ops = oap->oap_caller_ops;
2283                         caller_data = oap->oap_caller_data;
2284
2285                         clerq = cl_req_alloc(env, page, crt,
2286                                              1 /* only 1-object rpcs for
2287                                                 * now */);
2288                         if (IS_ERR(clerq))
2289                                 GOTO(out, req = (void *)clerq);
2290                         lock = oap->oap_ldlm_lock;
2291                 }
2292                 pga[i] = &oap->oap_brw_page;
2293                 pga[i]->off = oap->oap_obj_off + oap->oap_page_off;
2294                 CDEBUG(0, "put page %p index %lu oap %p flg %x to pga\n",
2295                        pga[i]->pg, cfs_page_index(oap->oap_page), oap, pga[i]->flag);
2296                 i++;
2297                 cl_req_page_add(env, clerq, page);
2298         }
2299
2300         /* always get the data for the obdo for the rpc */
2301         LASSERT(ops != NULL);
2302         crattr.cra_oa = oa;
2303         crattr.cra_capa = NULL;
2304         cl_req_attr_set(env, clerq, &crattr, ~0ULL);
2305         if (lock) {
2306                 oa->o_handle = lock->l_remote_handle;
2307                 oa->o_valid |= OBD_MD_FLHANDLE;
2308         }
2309
2310         rc = cl_req_prep(env, clerq);
2311         if (rc != 0) {
2312                 CERROR("cl_req_prep failed: %d\n", rc);
2313                 GOTO(out, req = ERR_PTR(rc));
2314         }
2315
2316         sort_brw_pages(pga, page_count);
2317         rc = osc_brw_prep_request(cmd, cli, oa, NULL, page_count,
2318                                   pga, &req, crattr.cra_capa, 1);
2319         if (rc != 0) {
2320                 CERROR("prep_req failed: %d\n", rc);
2321                 GOTO(out, req = ERR_PTR(rc));
2322         }
2323
2324         if (cmd & OBD_BRW_MEMALLOC)
2325                 req->rq_memalloc = 1;
2326
2327         /* Need to update the timestamps after the request is built in case
2328          * we race with setattr (locally or in queue at OST).  If OST gets
2329          * later setattr before earlier BRW (as determined by the request xid),
2330          * the OST will not use BRW timestamps.  Sadly, there is no obvious
2331          * way to do this in a single call.  bug 10150 */
2332         body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
2333         cl_req_attr_set(env, clerq, &crattr,
2334                         OBD_MD_FLMTIME|OBD_MD_FLCTIME|OBD_MD_FLATIME);
2335
2336         CLASSERT(sizeof(*aa) <= sizeof(req->rq_async_args));
2337         aa = ptlrpc_req_async_args(req);
2338         CFS_INIT_LIST_HEAD(&aa->aa_oaps);
2339         cfs_list_splice(rpc_list, &aa->aa_oaps);
2340         CFS_INIT_LIST_HEAD(rpc_list);
2341         aa->aa_clerq = clerq;
2342 out:
2343         if (cmd & OBD_BRW_MEMALLOC)
2344                 cfs_memory_pressure_restore(mpflag);
2345
2346         capa_put(crattr.cra_capa);
2347         if (IS_ERR(req)) {
2348                 if (oa)
2349                         OBDO_FREE(oa);
2350                 if (pga)
2351                         OBD_FREE(pga, sizeof(*pga) * page_count);
2352                 /* this should happen rarely and is pretty bad, it makes the
2353                  * pending list not follow the dirty order */
2354                 client_obd_list_lock(&cli->cl_loi_list_lock);
2355                 cfs_list_for_each_entry_safe(oap, tmp, rpc_list, oap_rpc_item) {
2356                         cfs_list_del_init(&oap->oap_rpc_item);
2357
2358                         /* queued sync pages can be torn down while the pages
2359                          * were between the pending list and the rpc */
2360                         if (oap->oap_interrupted) {
2361                                 CDEBUG(D_INODE, "oap %p interrupted\n", oap);
2362                                 osc_ap_completion(env, cli, NULL, oap, 0,
2363                                                   oap->oap_count);
2364                                 continue;
2365                         }
2366                         osc_ap_completion(env, cli, NULL, oap, 0, PTR_ERR(req));
2367                 }
2368                 if (clerq && !IS_ERR(clerq))
2369                         cl_req_completion(env, clerq, PTR_ERR(req));
2370         }
2371         RETURN(req);
2372 }
2373
2374 /**
2375  * prepare pages for ASYNC io and put pages in send queue.
2376  *
2377  * \param cmd OBD_BRW_* macroses
2378  * \param lop pending pages
2379  *
2380  * \return zero if no page added to send queue.
2381  * \return 1 if pages successfully added to send queue.
2382  * \return negative on errors.
2383  */
2384 static int
2385 osc_send_oap_rpc(const struct lu_env *env, struct client_obd *cli,
2386                  struct lov_oinfo *loi,
2387                  int cmd, struct loi_oap_pages *lop)
2388 {
2389         struct ptlrpc_request *req;
2390         obd_count page_count = 0;
2391         struct osc_async_page *oap = NULL, *tmp;
2392         struct osc_brw_async_args *aa;
2393         const struct obd_async_page_ops *ops;
2394         CFS_LIST_HEAD(rpc_list);
2395         CFS_LIST_HEAD(tmp_list);
2396         unsigned int ending_offset;
2397         unsigned  starting_offset = 0;
2398         int srvlock = 0, mem_tight = 0;
2399         struct cl_object *clob = NULL;
2400         ENTRY;
2401
2402         /* ASYNC_HP pages first. At present, when the lock the pages is
2403          * to be canceled, the pages covered by the lock will be sent out
2404          * with ASYNC_HP. We have to send out them as soon as possible. */
2405         cfs_list_for_each_entry_safe(oap, tmp, &lop->lop_urgent, oap_urgent_item) {
2406                 if (oap->oap_async_flags & ASYNC_HP) 
2407                         cfs_list_move(&oap->oap_pending_item, &tmp_list);
2408                 else
2409                         cfs_list_move_tail(&oap->oap_pending_item, &tmp_list);
2410                 if (++page_count >= cli->cl_max_pages_per_rpc)
2411                         break;
2412         }
2413
2414         cfs_list_splice(&tmp_list, &lop->lop_pending);
2415         page_count = 0;
2416
2417         /* first we find the pages we're allowed to work with */
2418         cfs_list_for_each_entry_safe(oap, tmp, &lop->lop_pending,
2419                                      oap_pending_item) {
2420                 ops = oap->oap_caller_ops;
2421
2422                 LASSERTF(oap->oap_magic == OAP_MAGIC, "Bad oap magic: oap %p, "
2423                          "magic 0x%x\n", oap, oap->oap_magic);
2424
2425                 if (clob == NULL) {
2426                         /* pin object in memory, so that completion call-backs
2427                          * can be safely called under client_obd_list lock. */
2428                         clob = osc_oap2cl_page(oap)->cp_obj;
2429                         cl_object_get(clob);
2430                 }
2431
2432                 if (page_count != 0 &&
2433                     srvlock != !!(oap->oap_brw_flags & OBD_BRW_SRVLOCK)) {
2434                         CDEBUG(D_PAGE, "SRVLOCK flag mismatch,"
2435                                " oap %p, page %p, srvlock %u\n",
2436                                oap, oap->oap_brw_page.pg, (unsigned)!srvlock);
2437                         break;
2438                 }
2439
2440                 /* If there is a gap at the start of this page, it can't merge
2441                  * with any previous page, so we'll hand the network a
2442                  * "fragmented" page array that it can't transfer in 1 RDMA */
2443                 if (page_count != 0 && oap->oap_page_off != 0)
2444                         break;
2445
2446                 /* in llite being 'ready' equates to the page being locked
2447                  * until completion unlocks it.  commit_write submits a page
2448                  * as not ready because its unlock will happen unconditionally
2449                  * as the call returns.  if we race with commit_write giving
2450                  * us that page we don't want to create a hole in the page
2451                  * stream, so we stop and leave the rpc to be fired by
2452                  * another dirtier or kupdated interval (the not ready page
2453                  * will still be on the dirty list).  we could call in
2454                  * at the end of ll_file_write to process the queue again. */
2455                 if (!(oap->oap_async_flags & ASYNC_READY)) {
2456                         int rc = ops->ap_make_ready(env, oap->oap_caller_data,
2457                                                     cmd);
2458                         if (rc < 0)
2459                                 CDEBUG(D_INODE, "oap %p page %p returned %d "
2460                                                 "instead of ready\n", oap,
2461                                                 oap->oap_page, rc);
2462                         switch (rc) {
2463                         case -EAGAIN:
2464                                 /* llite is telling us that the page is still
2465                                  * in commit_write and that we should try
2466                                  * and put it in an rpc again later.  we
2467                                  * break out of the loop so we don't create
2468                                  * a hole in the sequence of pages in the rpc
2469                                  * stream.*/
2470                                 oap = NULL;
2471                                 break;
2472                         case -EINTR:
2473                                 /* the io isn't needed.. tell the checks
2474                                  * below to complete the rpc with EINTR */
2475                                 cfs_spin_lock(&oap->oap_lock);
2476                                 oap->oap_async_flags |= ASYNC_COUNT_STABLE;
2477                                 cfs_spin_unlock(&oap->oap_lock);
2478                                 oap->oap_count = -EINTR;
2479                                 break;
2480                         case 0:
2481                                 cfs_spin_lock(&oap->oap_lock);
2482                                 oap->oap_async_flags |= ASYNC_READY;
2483                                 cfs_spin_unlock(&oap->oap_lock);
2484                                 break;
2485                         default:
2486                                 LASSERTF(0, "oap %p page %p returned %d "
2487                                             "from make_ready\n", oap,
2488                                             oap->oap_page, rc);
2489                                 break;
2490                         }
2491                 }
2492                 if (oap == NULL)
2493                         break;
2494                 /*
2495                  * Page submitted for IO has to be locked. Either by
2496                  * ->ap_make_ready() or by higher layers.
2497                  */
2498 #if defined(__KERNEL__) && defined(__linux__)
2499                 {
2500                         struct cl_page *page;
2501
2502                         page = osc_oap2cl_page(oap);
2503
2504                         if (page->cp_type == CPT_CACHEABLE &&
2505                             !(PageLocked(oap->oap_page) &&
2506                               (CheckWriteback(oap->oap_page, cmd)))) {
2507                                 CDEBUG(D_PAGE, "page %p lost wb %lx/%x\n",
2508                                        oap->oap_page,
2509                                        (long)oap->oap_page->flags,
2510                                        oap->oap_async_flags);
2511                                 LBUG();
2512                         }
2513                 }
2514 #endif
2515
2516                 /* take the page out of our book-keeping */
2517                 cfs_list_del_init(&oap->oap_pending_item);
2518                 lop_update_pending(cli, lop, cmd, -1);
2519                 cfs_list_del_init(&oap->oap_urgent_item);
2520
2521                 if (page_count == 0)
2522                         starting_offset = (oap->oap_obj_off+oap->oap_page_off) &
2523                                           (PTLRPC_MAX_BRW_SIZE - 1);
2524
2525                 /* ask the caller for the size of the io as the rpc leaves. */
2526                 if (!(oap->oap_async_flags & ASYNC_COUNT_STABLE)) {
2527                         oap->oap_count =
2528                                 ops->ap_refresh_count(env, oap->oap_caller_data,
2529                                                       cmd);
2530                         LASSERT(oap->oap_page_off + oap->oap_count <= CFS_PAGE_SIZE);
2531                 }
2532                 if (oap->oap_count <= 0) {
2533                         CDEBUG(D_CACHE, "oap %p count %d, completing\n", oap,
2534                                oap->oap_count);
2535                         osc_ap_completion(env, cli, NULL,
2536                                           oap, 0, oap->oap_count);
2537                         continue;
2538                 }
2539
2540                 /* now put the page back in our accounting */
2541                 cfs_list_add_tail(&oap->oap_rpc_item, &rpc_list);
2542                 if (oap->oap_brw_flags & OBD_BRW_MEMALLOC)
2543                         mem_tight = 1;
2544                 if (page_count == 0)
2545                         srvlock = !!(oap->oap_brw_flags & OBD_BRW_SRVLOCK);
2546                 if (++page_count >= cli->cl_max_pages_per_rpc)
2547                         break;
2548
2549                 /* End on a PTLRPC_MAX_BRW_SIZE boundary.  We want full-sized
2550                  * RPCs aligned on PTLRPC_MAX_BRW_SIZE boundaries to help reads
2551                  * have the same alignment as the initial writes that allocated
2552                  * extents on the server. */
2553                 ending_offset = (oap->oap_obj_off + oap->oap_page_off +
2554                                  oap->oap_count) & (PTLRPC_MAX_BRW_SIZE - 1);
2555                 if (ending_offset == 0)
2556                         break;
2557
2558                 /* If there is a gap at the end of this page, it can't merge
2559                  * with any subsequent pages, so we'll hand the network a
2560                  * "fragmented" page array that it can't transfer in 1 RDMA */
2561                 if (oap->oap_page_off + oap->oap_count < CFS_PAGE_SIZE)
2562                         break;
2563         }
2564
2565         osc_wake_cache_waiters(cli);
2566
2567         loi_list_maint(cli, loi);
2568
2569         client_obd_list_unlock(&cli->cl_loi_list_lock);
2570
2571         if (clob != NULL)
2572                 cl_object_put(env, clob);
2573
2574         if (page_count == 0) {
2575                 client_obd_list_lock(&cli->cl_loi_list_lock);
2576                 RETURN(0);
2577         }
2578
2579         req = osc_build_req(env, cli, &rpc_list, page_count,
2580                             mem_tight ? (cmd | OBD_BRW_MEMALLOC) : cmd);
2581         if (IS_ERR(req)) {
2582                 LASSERT(cfs_list_empty(&rpc_list));
2583                 loi_list_maint(cli, loi);
2584                 RETURN(PTR_ERR(req));
2585         }
2586
2587         aa = ptlrpc_req_async_args(req);
2588
2589         if (cmd == OBD_BRW_READ) {
2590                 lprocfs_oh_tally_log2(&cli->cl_read_page_hist, page_count);
2591                 lprocfs_oh_tally(&cli->cl_read_rpc_hist, cli->cl_r_in_flight);
2592                 lprocfs_oh_tally_log2(&cli->cl_read_offset_hist,
2593                                       (starting_offset >> CFS_PAGE_SHIFT) + 1);
2594         } else {
2595                 lprocfs_oh_tally_log2(&cli->cl_write_page_hist, page_count);
2596                 lprocfs_oh_tally(&cli->cl_write_rpc_hist,
2597                                  cli->cl_w_in_flight);
2598                 lprocfs_oh_tally_log2(&cli->cl_write_offset_hist,
2599                                       (starting_offset >> CFS_PAGE_SHIFT) + 1);
2600         }
2601         ptlrpc_lprocfs_brw(req, aa->aa_requested_nob);
2602
2603         client_obd_list_lock(&cli->cl_loi_list_lock);
2604
2605         if (cmd == OBD_BRW_READ)
2606                 cli->cl_r_in_flight++;
2607         else
2608                 cli->cl_w_in_flight++;
2609
2610         /* queued sync pages can be torn down while the pages
2611          * were between the pending list and the rpc */
2612         tmp = NULL;
2613         cfs_list_for_each_entry(oap, &aa->aa_oaps, oap_rpc_item) {
2614                 /* only one oap gets a request reference */
2615                 if (tmp == NULL)
2616                         tmp = oap;
2617                 if (oap->oap_interrupted && !req->rq_intr) {
2618                         CDEBUG(D_INODE, "oap %p in req %p interrupted\n",
2619                                oap, req);
2620                         ptlrpc_mark_interrupted(req);
2621                 }
2622         }
2623         if (tmp != NULL)
2624                 tmp->oap_request = ptlrpc_request_addref(req);
2625
2626         DEBUG_REQ(D_INODE, req, "%d pages, aa %p. now %dr/%dw in flight",
2627                   page_count, aa, cli->cl_r_in_flight, cli->cl_w_in_flight);
2628
2629         req->rq_interpret_reply = brw_interpret;
2630         ptlrpcd_add_req(req, PSCOPE_BRW);
2631         RETURN(1);
2632 }
2633
2634 #define LOI_DEBUG(LOI, STR, args...)                                     \
2635         CDEBUG(D_INODE, "loi ready %d wr %d:%d rd %d:%d " STR,           \
2636                !cfs_list_empty(&(LOI)->loi_ready_item) ||                \
2637                !cfs_list_empty(&(LOI)->loi_hp_ready_item),               \
2638                (LOI)->loi_write_lop.lop_num_pending,                     \
2639                !cfs_list_empty(&(LOI)->loi_write_lop.lop_urgent),        \
2640                (LOI)->loi_read_lop.lop_num_pending,                      \
2641                !cfs_list_empty(&(LOI)->loi_read_lop.lop_urgent),         \
2642                args)                                                     \
2643
2644 /* This is called by osc_check_rpcs() to find which objects have pages that
2645  * we could be sending.  These lists are maintained by lop_makes_rpc(). */
2646 struct lov_oinfo *osc_next_loi(struct client_obd *cli)
2647 {
2648         ENTRY;
2649
2650         /* First return objects that have blocked locks so that they
2651          * will be flushed quickly and other clients can get the lock,
2652          * then objects which have pages ready to be stuffed into RPCs */
2653         if (!cfs_list_empty(&cli->cl_loi_hp_ready_list))
2654                 RETURN(cfs_list_entry(cli->cl_loi_hp_ready_list.next,
2655                                       struct lov_oinfo, loi_hp_ready_item));
2656         if (!cfs_list_empty(&cli->cl_loi_ready_list))
2657                 RETURN(cfs_list_entry(cli->cl_loi_ready_list.next,
2658                                       struct lov_oinfo, loi_ready_item));
2659
2660         /* then if we have cache waiters, return all objects with queued
2661          * writes.  This is especially important when many small files
2662          * have filled up the cache and not been fired into rpcs because
2663          * they don't pass the nr_pending/object threshhold */
2664         if (!cfs_list_empty(&cli->cl_cache_waiters) &&
2665             !cfs_list_empty(&cli->cl_loi_write_list))
2666                 RETURN(cfs_list_entry(cli->cl_loi_write_list.next,
2667                                       struct lov_oinfo, loi_write_item));
2668
2669         /* then return all queued objects when we have an invalid import
2670          * so that they get flushed */
2671         if (cli->cl_import == NULL || cli->cl_import->imp_invalid) {
2672                 if (!cfs_list_empty(&cli->cl_loi_write_list))
2673                         RETURN(cfs_list_entry(cli->cl_loi_write_list.next,
2674                                               struct lov_oinfo,
2675                                               loi_write_item));
2676                 if (!cfs_list_empty(&cli->cl_loi_read_list))
2677                         RETURN(cfs_list_entry(cli->cl_loi_read_list.next,
2678                                               struct lov_oinfo, loi_read_item));
2679         }
2680         RETURN(NULL);
2681 }
2682
2683 static int osc_max_rpc_in_flight(struct client_obd *cli, struct lov_oinfo *loi)
2684 {
2685         struct osc_async_page *oap;
2686         int hprpc = 0;
2687
2688         if (!cfs_list_empty(&loi->loi_write_lop.lop_urgent)) {
2689                 oap = cfs_list_entry(loi->loi_write_lop.lop_urgent.next,
2690                                      struct osc_async_page, oap_urgent_item);
2691                 hprpc = !!(oap->oap_async_flags & ASYNC_HP);
2692         }
2693
2694         if (!hprpc && !cfs_list_empty(&loi->loi_read_lop.lop_urgent)) {
2695                 oap = cfs_list_entry(loi->loi_read_lop.lop_urgent.next,
2696                                      struct osc_async_page, oap_urgent_item);
2697                 hprpc = !!(oap->oap_async_flags & ASYNC_HP);
2698         }
2699
2700         return rpcs_in_flight(cli) >= cli->cl_max_rpcs_in_flight + hprpc;
2701 }
2702
2703 /* called with the loi list lock held */
2704 void osc_check_rpcs(const struct lu_env *env, struct client_obd *cli)
2705 {
2706         struct lov_oinfo *loi;
2707         int rc = 0, race_counter = 0;
2708         ENTRY;
2709
2710         while ((loi = osc_next_loi(cli)) != NULL) {
2711                 LOI_DEBUG(loi, "%lu in flight\n", rpcs_in_flight(cli));
2712
2713                 if (osc_max_rpc_in_flight(cli, loi))
2714                         break;
2715
2716                 /* attempt some read/write balancing by alternating between
2717                  * reads and writes in an object.  The makes_rpc checks here
2718                  * would be redundant if we were getting read/write work items
2719                  * instead of objects.  we don't want send_oap_rpc to drain a
2720                  * partial read pending queue when we're given this object to
2721                  * do io on writes while there are cache waiters */
2722                 if (lop_makes_rpc(cli, &loi->loi_write_lop, OBD_BRW_WRITE)) {
2723                         rc = osc_send_oap_rpc(env, cli, loi, OBD_BRW_WRITE,
2724                                               &loi->loi_write_lop);
2725                         if (rc < 0) {
2726                                 CERROR("Write request failed with %d\n", rc);
2727
2728                                 /* osc_send_oap_rpc failed, mostly because of
2729                                  * memory pressure.
2730                                  *
2731                                  * It can't break here, because if:
2732                                  *  - a page was submitted by osc_io_submit, so
2733                                  *    page locked;
2734                                  *  - no request in flight
2735                                  *  - no subsequent request
2736                                  * The system will be in live-lock state,
2737                                  * because there is no chance to call
2738                                  * osc_io_unplug() and osc_check_rpcs() any
2739                                  * more. pdflush can't help in this case,
2740                                  * because it might be blocked at grabbing
2741                                  * the page lock as we mentioned.
2742                                  *
2743                                  * Anyway, continue to drain pages. */
2744                                 /* break; */
2745                         }
2746
2747                         if (rc > 0)
2748                                 race_counter = 0;
2749                         else
2750                                 race_counter++;
2751                 }
2752                 if (lop_makes_rpc(cli, &loi->loi_read_lop, OBD_BRW_READ)) {
2753                         rc = osc_send_oap_rpc(env, cli, loi, OBD_BRW_READ,
2754                                               &loi->loi_read_lop);
2755                         if (rc < 0)
2756                                 CERROR("Read request failed with %d\n", rc);
2757
2758                         if (rc > 0)
2759                                 race_counter = 0;
2760                         else
2761                                 race_counter++;
2762                 }
2763
2764                 /* attempt some inter-object balancing by issuing rpcs
2765                  * for each object in turn */
2766                 if (!cfs_list_empty(&loi->loi_hp_ready_item))
2767                         cfs_list_del_init(&loi->loi_hp_ready_item);
2768                 if (!cfs_list_empty(&loi->loi_ready_item))
2769                         cfs_list_del_init(&loi->loi_ready_item);
2770                 if (!cfs_list_empty(&loi->loi_write_item))
2771                         cfs_list_del_init(&loi->loi_write_item);
2772                 if (!cfs_list_empty(&loi->loi_read_item))
2773                         cfs_list_del_init(&loi->loi_read_item);
2774
2775                 loi_list_maint(cli, loi);
2776
2777                 /* send_oap_rpc fails with 0 when make_ready tells it to
2778                  * back off.  llite's make_ready does this when it tries
2779                  * to lock a page queued for write that is already locked.
2780                  * we want to try sending rpcs from many objects, but we
2781                  * don't want to spin failing with 0.  */
2782                 if (race_counter == 10)
2783                         break;
2784         }
2785         EXIT;
2786 }
2787
2788 /* we're trying to queue a page in the osc so we're subject to the
2789  * 'cl_dirty_max' limit on the number of pages that can be queued in the osc.
2790  * If the osc's queued pages are already at that limit, then we want to sleep
2791  * until there is space in the osc's queue for us.  We also may be waiting for
2792  * write credits from the OST if there are RPCs in flight that may return some
2793  * before we fall back to sync writes.
2794  *
2795  * We need this know our allocation was granted in the presence of signals */
2796 static int ocw_granted(struct client_obd *cli, struct osc_cache_waiter *ocw)
2797 {
2798         int rc;
2799         ENTRY;
2800         client_obd_list_lock(&cli->cl_loi_list_lock);
2801         rc = cfs_list_empty(&ocw->ocw_entry) || rpcs_in_flight(cli) == 0;
2802         client_obd_list_unlock(&cli->cl_loi_list_lock);
2803         RETURN(rc);
2804 };
2805
2806 /**
2807  * Non-blocking version of osc_enter_cache() that consumes grant only when it
2808  * is available.
2809  */
2810 int osc_enter_cache_try(const struct lu_env *env,
2811                         struct client_obd *cli, struct lov_oinfo *loi,
2812                         struct osc_async_page *oap, int transient)
2813 {
2814         int has_grant;
2815
2816         has_grant = cli->cl_avail_grant >= CFS_PAGE_SIZE;
2817         if (has_grant) {
2818                 osc_consume_write_grant(cli, &oap->oap_brw_page);
2819                 if (transient) {
2820                         cli->cl_dirty_transit += CFS_PAGE_SIZE;
2821                         cfs_atomic_inc(&obd_dirty_transit_pages);
2822                         oap->oap_brw_flags |= OBD_BRW_NOCACHE;
2823                 }
2824         }
2825         return has_grant;
2826 }
2827
2828 /* Caller must hold loi_list_lock - we drop/regain it if we need to wait for
2829  * grant or cache space. */
2830 static int osc_enter_cache(const struct lu_env *env,
2831                            struct client_obd *cli, struct lov_oinfo *loi,
2832                            struct osc_async_page *oap)
2833 {
2834         struct osc_cache_waiter ocw;
2835         struct l_wait_info lwi = { 0 };
2836
2837         ENTRY;
2838
2839         CDEBUG(D_CACHE, "dirty: %ld/%d dirty_max: %ld/%d dropped: %lu "
2840                "grant: %lu\n", cli->cl_dirty, cfs_atomic_read(&obd_dirty_pages),
2841                cli->cl_dirty_max, obd_max_dirty_pages,
2842                cli->cl_lost_grant, cli->cl_avail_grant);
2843
2844         /* force the caller to try sync io.  this can jump the list
2845          * of queued writes and create a discontiguous rpc stream */
2846         if (cli->cl_dirty_max < CFS_PAGE_SIZE || cli->cl_ar.ar_force_sync ||
2847             loi->loi_ar.ar_force_sync)
2848                 RETURN(-EDQUOT);
2849
2850         /* Hopefully normal case - cache space and write credits available */
2851         if (cli->cl_dirty + CFS_PAGE_SIZE <= cli->cl_dirty_max &&
2852             cfs_atomic_read(&obd_dirty_pages) + 1 <= obd_max_dirty_pages &&
2853             osc_enter_cache_try(env, cli, loi, oap, 0))
2854                 RETURN(0);
2855
2856         /* It is safe to block as a cache waiter as long as there is grant
2857          * space available or the hope of additional grant being returned
2858          * when an in flight write completes.  Using the write back cache
2859          * if possible is preferable to sending the data synchronously
2860          * because write pages can then be merged in to large requests.
2861          * The addition of this cache waiter will causing pending write
2862          * pages to be sent immediately. */
2863         if (cli->cl_w_in_flight || cli->cl_avail_grant >= CFS_PAGE_SIZE) {
2864                 cfs_list_add_tail(&ocw.ocw_entry, &cli->cl_cache_waiters);
2865                 cfs_waitq_init(&ocw.ocw_waitq);
2866                 ocw.ocw_oap = oap;
2867                 ocw.ocw_rc = 0;
2868
2869                 loi_list_maint(cli, loi);
2870                 osc_check_rpcs(env, cli);
2871                 client_obd_list_unlock(&cli->cl_loi_list_lock);
2872
2873                 CDEBUG(D_CACHE, "sleeping for cache space\n");
2874                 l_wait_event(ocw.ocw_waitq, ocw_granted(cli, &ocw), &lwi);
2875
2876                 client_obd_list_lock(&cli->cl_loi_list_lock);
2877                 if (!cfs_list_empty(&ocw.ocw_entry)) {
2878                         cfs_list_del(&ocw.ocw_entry);
2879                         RETURN(-EINTR);
2880                 }
2881                 RETURN(ocw.ocw_rc);
2882         }
2883
2884         RETURN(-EDQUOT);
2885 }
2886
2887
2888 int osc_prep_async_page(struct obd_export *exp, struct lov_stripe_md *lsm,
2889                         struct lov_oinfo *loi, cfs_page_t *page,
2890                         obd_off offset, const struct obd_async_page_ops *ops,
2891                         void *data, void **res, int nocache,
2892                         struct lustre_handle *lockh)
2893 {
2894         struct osc_async_page *oap;
2895
2896         ENTRY;
2897
2898         if (!page)
2899                 return cfs_size_round(sizeof(*oap));
2900
2901         oap = *res;
2902         oap->oap_magic = OAP_MAGIC;
2903         oap->oap_cli = &exp->exp_obd->u.cli;
2904         oap->oap_loi = loi;
2905
2906         oap->oap_caller_ops = ops;
2907         oap->oap_caller_data = data;
2908
2909         oap->oap_page = page;
2910         oap->oap_obj_off = offset;
2911         if (!client_is_remote(exp) &&
2912             cfs_capable(CFS_CAP_SYS_RESOURCE))
2913                 oap->oap_brw_flags = OBD_BRW_NOQUOTA;
2914
2915         LASSERT(!(offset & ~CFS_PAGE_MASK));
2916
2917         CFS_INIT_LIST_HEAD(&oap->oap_pending_item);
2918         CFS_INIT_LIST_HEAD(&oap->oap_urgent_item);
2919         CFS_INIT_LIST_HEAD(&oap->oap_rpc_item);
2920         CFS_INIT_LIST_HEAD(&oap->oap_page_list);
2921
2922         cfs_spin_lock_init(&oap->oap_lock);
2923         CDEBUG(D_CACHE, "oap %p page %p obj off "LPU64"\n", oap, page, offset);
2924         RETURN(0);
2925 }
2926
2927 struct osc_async_page *oap_from_cookie(void *cookie)
2928 {
2929         struct osc_async_page *oap = cookie;
2930         if (oap->oap_magic != OAP_MAGIC)
2931                 return ERR_PTR(-EINVAL);
2932         return oap;
2933 };
2934
2935 int osc_queue_async_io(const struct lu_env *env,
2936                        struct obd_export *exp, struct lov_stripe_md *lsm,
2937                        struct lov_oinfo *loi, void *cookie,
2938                        int cmd, obd_off off, int count,
2939                        obd_flag brw_flags, enum async_flags async_flags)
2940 {
2941         struct client_obd *cli = &exp->exp_obd->u.cli;
2942         struct osc_async_page *oap;
2943         int rc = 0;
2944         ENTRY;
2945
2946         oap = oap_from_cookie(cookie);
2947         if (IS_ERR(oap))
2948                 RETURN(PTR_ERR(oap));
2949
2950         if (cli->cl_import == NULL || cli->cl_import->imp_invalid)
2951                 RETURN(-EIO);
2952
2953         if (!cfs_list_empty(&oap->oap_pending_item) ||
2954             !cfs_list_empty(&oap->oap_urgent_item) ||
2955             !cfs_list_empty(&oap->oap_rpc_item))
2956                 RETURN(-EBUSY);
2957
2958         /* check if the file's owner/group is over quota */
2959         if ((cmd & OBD_BRW_WRITE) && !(cmd & OBD_BRW_NOQUOTA)) {
2960                 struct cl_object *obj;
2961                 struct cl_attr    attr; /* XXX put attr into thread info */
2962                 unsigned int qid[MAXQUOTAS];
2963
2964                 obj = cl_object_top(osc_oap2cl_page(oap)->cp_obj);
2965
2966                 cl_object_attr_lock(obj);
2967                 rc = cl_object_attr_get(env, obj, &attr);
2968                 cl_object_attr_unlock(obj);
2969
2970                 qid[USRQUOTA] = attr.cat_uid;
2971                 qid[GRPQUOTA] = attr.cat_gid;
2972                 if (rc == 0 &&
2973                     lquota_chkdq(quota_interface, cli, qid) == NO_QUOTA)
2974                         rc = -EDQUOT;
2975                 if (rc)
2976                         RETURN(rc);
2977         }
2978
2979         if (loi == NULL)
2980                 loi = lsm->lsm_oinfo[0];
2981
2982         client_obd_list_lock(&cli->cl_loi_list_lock);
2983
2984         LASSERT(off + count <= CFS_PAGE_SIZE);
2985         oap->oap_cmd = cmd;
2986         oap->oap_page_off = off;
2987         oap->oap_count = count;
2988         oap->oap_brw_flags = brw_flags;
2989         /* Give a hint to OST that requests are coming from kswapd - bug19529 */
2990         if (cfs_memory_pressure_get())
2991                 oap->oap_brw_flags |= OBD_BRW_MEMALLOC;
2992         cfs_spin_lock(&oap->oap_lock);
2993         oap->oap_async_flags = async_flags;
2994         cfs_spin_unlock(&oap->oap_lock);
2995
2996         if (cmd & OBD_BRW_WRITE) {
2997                 rc = osc_enter_cache(env, cli, loi, oap);
2998                 if (rc) {
2999                         client_obd_list_unlock(&cli->cl_loi_list_lock);
3000                         RETURN(rc);
3001                 }
3002         }
3003
3004         osc_oap_to_pending(oap);
3005         loi_list_maint(cli, loi);
3006
3007         LOI_DEBUG(loi, "oap %p page %p added for cmd %d\n", oap, oap->oap_page,
3008                   cmd);
3009
3010         osc_check_rpcs(env, cli);
3011         client_obd_list_unlock(&cli->cl_loi_list_lock);
3012
3013         RETURN(0);
3014 }
3015
3016 /* aka (~was & now & flag), but this is more clear :) */
3017 #define SETTING(was, now, flag) (!(was & flag) && (now & flag))
3018
3019 int osc_set_async_flags_base(struct client_obd *cli,
3020                              struct lov_oinfo *loi, struct osc_async_page *oap,
3021                              obd_flag async_flags)
3022 {
3023         struct loi_oap_pages *lop;
3024         int flags = 0;
3025         ENTRY;
3026
3027         LASSERT(!cfs_list_empty(&oap->oap_pending_item));
3028
3029         if (oap->oap_cmd & OBD_BRW_WRITE) {
3030                 lop = &loi->loi_write_lop;
3031         } else {
3032                 lop = &loi->loi_read_lop;
3033         }
3034
3035         if ((oap->oap_async_flags & async_flags) == async_flags)
3036                 RETURN(0);
3037
3038         if (SETTING(oap->oap_async_flags, async_flags, ASYNC_READY))
3039                 flags |= ASYNC_READY;
3040
3041         if (SETTING(oap->oap_async_flags, async_flags, ASYNC_URGENT) &&
3042             cfs_list_empty(&oap->oap_rpc_item)) {
3043                 if (oap->oap_async_flags & ASYNC_HP)
3044                         cfs_list_add(&oap->oap_urgent_item, &lop->lop_urgent);
3045                 else
3046                         cfs_list_add_tail(&oap->oap_urgent_item,
3047                                           &lop->lop_urgent);
3048                 flags |= ASYNC_URGENT;
3049                 loi_list_maint(cli, loi);
3050         }
3051         cfs_spin_lock(&oap->oap_lock);
3052         oap->oap_async_flags |= flags;
3053         cfs_spin_unlock(&oap->oap_lock);
3054
3055         LOI_DEBUG(loi, "oap %p page %p has flags %x\n", oap, oap->oap_page,
3056                         oap->oap_async_flags);
3057         RETURN(0);
3058 }
3059
3060 int osc_teardown_async_page(struct obd_export *exp,
3061                             struct lov_stripe_md *lsm,
3062                             struct lov_oinfo *loi, void *cookie)
3063 {
3064         struct client_obd *cli = &exp->exp_obd->u.cli;
3065         struct loi_oap_pages *lop;
3066         struct osc_async_page *oap;
3067         int rc = 0;
3068         ENTRY;
3069
3070         oap = oap_from_cookie(cookie);
3071         if (IS_ERR(oap))
3072                 RETURN(PTR_ERR(oap));
3073
3074         if (loi == NULL)
3075                 loi = lsm->lsm_oinfo[0];
3076
3077         if (oap->oap_cmd & OBD_BRW_WRITE) {
3078                 lop = &loi->loi_write_lop;
3079         } else {
3080                 lop = &loi->loi_read_lop;
3081         }
3082
3083         client_obd_list_lock(&cli->cl_loi_list_lock);
3084
3085         if (!cfs_list_empty(&oap->oap_rpc_item))
3086                 GOTO(out, rc = -EBUSY);
3087
3088         osc_exit_cache(cli, oap, 0);
3089         osc_wake_cache_waiters(cli);
3090
3091         if (!cfs_list_empty(&oap->oap_urgent_item)) {
3092                 cfs_list_del_init(&oap->oap_urgent_item);
3093                 cfs_spin_lock(&oap->oap_lock);
3094                 oap->oap_async_flags &= ~(ASYNC_URGENT | ASYNC_HP);
3095                 cfs_spin_unlock(&oap->oap_lock);
3096         }
3097         if (!cfs_list_empty(&oap->oap_pending_item)) {
3098                 cfs_list_del_init(&oap->oap_pending_item);
3099                 lop_update_pending(cli, lop, oap->oap_cmd, -1);
3100         }
3101         loi_list_maint(cli, loi);
3102         LOI_DEBUG(loi, "oap %p page %p torn down\n", oap, oap->oap_page);
3103 out:
3104         client_obd_list_unlock(&cli->cl_loi_list_lock);
3105         RETURN(rc);
3106 }
3107
3108 static void osc_set_lock_data_with_check(struct ldlm_lock *lock,
3109                                          struct ldlm_enqueue_info *einfo,
3110                                          int flags)
3111 {
3112         void *data = einfo->ei_cbdata;
3113
3114         LASSERT(lock != NULL);
3115         LASSERT(lock->l_blocking_ast == einfo->ei_cb_bl);
3116         LASSERT(lock->l_resource->lr_type == einfo->ei_type);
3117         LASSERT(lock->l_completion_ast == einfo->ei_cb_cp);
3118         LASSERT(lock->l_glimpse_ast == einfo->ei_cb_gl);
3119
3120         lock_res_and_lock(lock);
3121         cfs_spin_lock(&osc_ast_guard);
3122         LASSERT(lock->l_ast_data == NULL || lock->l_ast_data == data);
3123         lock->l_ast_data = data;
3124         cfs_spin_unlock(&osc_ast_guard);
3125         unlock_res_and_lock(lock);
3126 }
3127
3128 static void osc_set_data_with_check(struct lustre_handle *lockh,
3129                                     struct ldlm_enqueue_info *einfo,
3130                                     int flags)
3131 {
3132         struct ldlm_lock *lock = ldlm_handle2lock(lockh);
3133
3134         if (lock != NULL) {
3135                 osc_set_lock_data_with_check(lock, einfo, flags);
3136                 LDLM_LOCK_PUT(lock);
3137         } else
3138                 CERROR("lockh %p, data %p - client evicted?\n",
3139                        lockh, einfo->ei_cbdata);
3140 }
3141
3142 static int osc_change_cbdata(struct obd_export *exp, struct lov_stripe_md *lsm,
3143                              ldlm_iterator_t replace, void *data)
3144 {
3145         struct ldlm_res_id res_id;
3146         struct obd_device *obd = class_exp2obd(exp);
3147
3148         osc_build_res_name(lsm->lsm_object_id, lsm->lsm_object_seq, &res_id);
3149         ldlm_resource_iterate(obd->obd_namespace, &res_id, replace, data);
3150         return 0;
3151 }
3152
3153 /* find any ldlm lock of the inode in osc
3154  * return 0    not find
3155  *        1    find one
3156  *      < 0    error */
3157 static int osc_find_cbdata(struct obd_export *exp, struct lov_stripe_md *lsm,
3158                            ldlm_iterator_t replace, void *data)
3159 {
3160         struct ldlm_res_id res_id;
3161         struct obd_device *obd = class_exp2obd(exp);
3162         int rc = 0;
3163
3164         osc_build_res_name(lsm->lsm_object_id, lsm->lsm_object_seq, &res_id);
3165         rc = ldlm_resource_iterate(obd->obd_namespace, &res_id, replace, data);
3166         if (rc == LDLM_ITER_STOP)
3167                 return(1);
3168         if (rc == LDLM_ITER_CONTINUE)
3169                 return(0);
3170         return(rc);
3171 }
3172
3173 static int osc_enqueue_fini(struct ptlrpc_request *req, struct ost_lvb *lvb,
3174                             obd_enqueue_update_f upcall, void *cookie,
3175                             int *flags, int rc)
3176 {
3177         int intent = *flags & LDLM_FL_HAS_INTENT;
3178         ENTRY;
3179
3180         if (intent) {
3181                 /* The request was created before ldlm_cli_enqueue call. */
3182                 if (rc == ELDLM_LOCK_ABORTED) {
3183                         struct ldlm_reply *rep;
3184                         rep = req_capsule_server_get(&req->rq_pill,
3185                                                      &RMF_DLM_REP);
3186
3187                         LASSERT(rep != NULL);
3188                         if (rep->lock_policy_res1)
3189                                 rc = rep->lock_policy_res1;
3190                 }
3191         }
3192
3193         if ((intent && rc == ELDLM_LOCK_ABORTED) || !rc) {
3194                 *flags |= LDLM_FL_LVB_READY;
3195                 CDEBUG(D_INODE,"got kms "LPU64" blocks "LPU64" mtime "LPU64"\n",
3196                        lvb->lvb_size, lvb->lvb_blocks, lvb->lvb_mtime);
3197         }
3198
3199         /* Call the update callback. */
3200         rc = (*upcall)(cookie, rc);
3201         RETURN(rc);
3202 }
3203
3204 static int osc_enqueue_interpret(const struct lu_env *env,
3205                                  struct ptlrpc_request *req,
3206                                  struct osc_enqueue_args *aa, int rc)
3207 {
3208         struct ldlm_lock *lock;
3209         struct lustre_handle handle;
3210         __u32 mode;
3211
3212         /* Make a local copy of a lock handle and a mode, because aa->oa_*
3213          * might be freed anytime after lock upcall has been called. */
3214         lustre_handle_copy(&handle, aa->oa_lockh);
3215         mode = aa->oa_ei->ei_mode;
3216
3217         /* ldlm_cli_enqueue is holding a reference on the lock, so it must
3218          * be valid. */
3219         lock = ldlm_handle2lock(&handle);
3220
3221         /* Take an additional reference so that a blocking AST that
3222          * ldlm_cli_enqueue_fini() might post for a failed lock, is guaranteed
3223          * to arrive after an upcall has been executed by
3224          * osc_enqueue_fini(). */
3225         ldlm_lock_addref(&handle, mode);
3226
3227         /* Let CP AST to grant the lock first. */
3228         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 1);
3229
3230         /* Complete obtaining the lock procedure. */
3231         rc = ldlm_cli_enqueue_fini(aa->oa_exp, req, aa->oa_ei->ei_type, 1,
3232                                    mode, aa->oa_flags, aa->oa_lvb,
3233                                    sizeof(*aa->oa_lvb), &handle, rc);
3234         /* Complete osc stuff. */
3235         rc = osc_enqueue_fini(req, aa->oa_lvb,
3236                               aa->oa_upcall, aa->oa_cookie, aa->oa_flags, rc);
3237
3238         OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_CANCEL_RACE, 10);
3239
3240         /* Release the lock for async request. */
3241         if (lustre_handle_is_used(&handle) && rc == ELDLM_OK)
3242                 /*
3243                  * Releases a reference taken by ldlm_cli_enqueue(), if it is
3244                  * not already released by
3245                  * ldlm_cli_enqueue_fini()->failed_lock_cleanup()
3246                  */
3247                 ldlm_lock_decref(&handle, mode);
3248
3249         LASSERTF(lock != NULL, "lockh %p, req %p, aa %p - client evicted?\n",
3250                  aa->oa_lockh, req, aa);
3251         ldlm_lock_decref(&handle, mode);
3252         LDLM_LOCK_PUT(lock);
3253         return rc;
3254 }
3255
3256 void osc_update_enqueue(struct lustre_handle *lov_lockhp,
3257                         struct lov_oinfo *loi, int flags,
3258                         struct ost_lvb *lvb, __u32 mode, int rc)
3259 {
3260         if (rc == ELDLM_OK) {
3261                 struct ldlm_lock *lock = ldlm_handle2lock(lov_lockhp);
3262                 __u64 tmp;
3263
3264                 LASSERT(lock != NULL);
3265                 loi->loi_lvb = *lvb;
3266                 tmp = loi->loi_lvb.lvb_size;
3267                 /* Extend KMS up to the end of this lock and no further
3268                  * A lock on [x,y] means a KMS of up to y + 1 bytes! */
3269                 if (tmp > lock->l_policy_data.l_extent.end)
3270                         tmp = lock->l_policy_data.l_extent.end + 1;
3271                 if (tmp >= loi->loi_kms) {
3272                         LDLM_DEBUG(lock, "lock acquired, setting rss="LPU64
3273                                    ", kms="LPU64, loi->loi_lvb.lvb_size, tmp);
3274                         loi_kms_set(loi, tmp);
3275                 } else {
3276                         LDLM_DEBUG(lock, "lock acquired, setting rss="
3277                                    LPU64"; leaving kms="LPU64", end="LPU64,
3278                                    loi->loi_lvb.lvb_size, loi->loi_kms,
3279                                    lock->l_policy_data.l_extent.end);
3280                 }
3281                 ldlm_lock_allow_match(lock);
3282                 LDLM_LOCK_PUT(lock);
3283         } else if (rc == ELDLM_LOCK_ABORTED && (flags & LDLM_FL_HAS_INTENT)) {
3284                 loi->loi_lvb = *lvb;
3285                 CDEBUG(D_INODE, "glimpsed, setting rss="LPU64"; leaving"
3286                        " kms="LPU64"\n", loi->loi_lvb.lvb_size, loi->loi_kms);
3287                 rc = ELDLM_OK;
3288         }
3289 }
3290 EXPORT_SYMBOL(osc_update_enqueue);
3291
3292 struct ptlrpc_request_set *PTLRPCD_SET = (void *)1;
3293
3294 /* When enqueuing asynchronously, locks are not ordered, we can obtain a lock
3295  * from the 2nd OSC before a lock from the 1st one. This does not deadlock with
3296  * other synchronous requests, however keeping some locks and trying to obtain
3297  * others may take a considerable amount of time in a case of ost failure; and
3298  * when other sync requests do not get released lock from a client, the client
3299  * is excluded from the cluster -- such scenarious make the life difficult, so
3300  * release locks just after they are obtained. */
3301 int osc_enqueue_base(struct obd_export *exp, struct ldlm_res_id *res_id,
3302                      int *flags, ldlm_policy_data_t *policy,
3303                      struct ost_lvb *lvb, int kms_valid,
3304                      obd_enqueue_update_f upcall, void *cookie,
3305                      struct ldlm_enqueue_info *einfo,
3306                      struct lustre_handle *lockh,
3307                      struct ptlrpc_request_set *rqset, int async)
3308 {
3309         struct obd_device *obd = exp->exp_obd;
3310         struct ptlrpc_request *req = NULL;
3311         int intent = *flags & LDLM_FL_HAS_INTENT;
3312         ldlm_mode_t mode;
3313         int rc;
3314         ENTRY;
3315
3316         /* Filesystem lock extents are extended to page boundaries so that
3317          * dealing with the page cache is a little smoother.  */
3318         policy->l_extent.start -= policy->l_extent.start & ~CFS_PAGE_MASK;
3319         policy->l_extent.end |= ~CFS_PAGE_MASK;
3320
3321         /*
3322          * kms is not valid when either object is completely fresh (so that no
3323          * locks are cached), or object was evicted. In the latter case cached
3324          * lock cannot be used, because it would prime inode state with
3325          * potentially stale LVB.
3326          */
3327         if (!kms_valid)
3328                 goto no_match;
3329
3330         /* Next, search for already existing extent locks that will cover us */
3331         /* If we're trying to read, we also search for an existing PW lock.  The
3332          * VFS and page cache already protect us locally, so lots of readers/
3333          * writers can share a single PW lock.
3334          *
3335          * There are problems with conversion deadlocks, so instead of
3336          * converting a read lock to a write lock, we'll just enqueue a new
3337          * one.
3338          *
3339          * At some point we should cancel the read lock instead of making them
3340          * send us a blocking callback, but there are problems with canceling
3341          * locks out from other users right now, too. */
3342         mode = einfo->ei_mode;
3343         if (einfo->ei_mode == LCK_PR)
3344                 mode |= LCK_PW;
3345         mode = ldlm_lock_match(obd->obd_namespace,
3346                                *flags | LDLM_FL_LVB_READY, res_id,
3347                                einfo->ei_type, policy, mode, lockh, 0);
3348         if (mode) {
3349                 struct ldlm_lock *matched = ldlm_handle2lock(lockh);
3350
3351                 if (matched->l_ast_data == NULL ||
3352                     matched->l_ast_data == einfo->ei_cbdata) {
3353                         /* addref the lock only if not async requests and PW
3354                          * lock is matched whereas we asked for PR. */
3355                         if (!rqset && einfo->ei_mode != mode)
3356                                 ldlm_lock_addref(lockh, LCK_PR);
3357                         osc_set_lock_data_with_check(matched, einfo, *flags);
3358                         if (intent) {
3359                                 /* I would like to be able to ASSERT here that
3360                                  * rss <= kms, but I can't, for reasons which
3361                                  * are explained in lov_enqueue() */
3362                         }
3363
3364                         /* We already have a lock, and it's referenced */
3365                         (*upcall)(cookie, ELDLM_OK);
3366
3367                         /* For async requests, decref the lock. */
3368                         if (einfo->ei_mode != mode)
3369                                 ldlm_lock_decref(lockh, LCK_PW);
3370                         else if (rqset)
3371                                 ldlm_lock_decref(lockh, einfo->ei_mode);
3372                         LDLM_LOCK_PUT(matched);
3373                         RETURN(ELDLM_OK);
3374                 } else
3375                         ldlm_lock_decref(lockh, mode);
3376                 LDLM_LOCK_PUT(matched);
3377         }
3378
3379  no_match:
3380         if (intent) {
3381                 CFS_LIST_HEAD(cancels);
3382                 req = ptlrpc_request_alloc(class_exp2cliimp(exp),
3383                                            &RQF_LDLM_ENQUEUE_LVB);
3384                 if (req == NULL)
3385                         RETURN(-ENOMEM);
3386
3387                 rc = ldlm_prep_enqueue_req(exp, req, &cancels, 0);
3388                 if (rc) {
3389                         ptlrpc_request_free(req);
3390                         RETURN(rc);
3391                 }
3392
3393                 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
3394                                      sizeof *lvb);
3395                 ptlrpc_request_set_replen(req);
3396         }
3397
3398         /* users of osc_enqueue() can pass this flag for ldlm_lock_match() */
3399         *flags &= ~LDLM_FL_BLOCK_GRANTED;
3400
3401         rc = ldlm_cli_enqueue(exp, &req, einfo, res_id, policy, flags, lvb,
3402                               sizeof(*lvb), lockh, async);
3403         if (rqset) {
3404                 if (!rc) {
3405                         struct osc_enqueue_args *aa;
3406                         CLASSERT (sizeof(*aa) <= sizeof(req->rq_async_args));
3407                         aa = ptlrpc_req_async_args(req);
3408                         aa->oa_ei = einfo;
3409                         aa->oa_exp = exp;
3410                         aa->oa_flags  = flags;
3411                         aa->oa_upcall = upcall;
3412                         aa->oa_cookie = cookie;
3413                         aa->oa_lvb    = lvb;
3414                         aa->oa_lockh  = lockh;
3415
3416                         req->rq_interpret_reply =
3417                                 (ptlrpc_interpterer_t)osc_enqueue_interpret;
3418                         if (rqset == PTLRPCD_SET)
3419                                 ptlrpcd_add_req(req, PSCOPE_OTHER);
3420                         else
3421                                 ptlrpc_set_add_req(rqset, req);
3422                 } else if (intent) {
3423                         ptlrpc_req_finished(req);
3424                 }
3425                 RETURN(rc);
3426         }
3427
3428         rc = osc_enqueue_fini(req, lvb, upcall, cookie, flags, rc);
3429         if (intent)
3430                 ptlrpc_req_finished(req);
3431
3432         RETURN(rc);
3433 }
3434
3435 static int osc_enqueue(struct obd_export *exp, struct obd_info *oinfo,
3436                        struct ldlm_enqueue_info *einfo,
3437                        struct ptlrpc_request_set *rqset)
3438 {
3439         struct ldlm_res_id res_id;
3440         int rc;
3441         ENTRY;
3442
3443         osc_build_res_name(oinfo->oi_md->lsm_object_id,
3444                            oinfo->oi_md->lsm_object_seq, &res_id);
3445
3446         rc = osc_enqueue_base(exp, &res_id, &oinfo->oi_flags, &oinfo->oi_policy,
3447                               &oinfo->oi_md->lsm_oinfo[0]->loi_lvb,
3448                               oinfo->oi_md->lsm_oinfo[0]->loi_kms_valid,
3449                               oinfo->oi_cb_up, oinfo, einfo, oinfo->oi_lockh,
3450                               rqset, rqset != NULL);
3451         RETURN(rc);
3452 }
3453
3454 int osc_match_base(struct obd_export *exp, struct ldlm_res_id *res_id,
3455                    __u32 type, ldlm_policy_data_t *policy, __u32 mode,
3456                    int *flags, void *data, struct lustre_handle *lockh,
3457                    int unref)
3458 {
3459         struct obd_device *obd = exp->exp_obd;
3460         int lflags = *flags;
3461         ldlm_mode_t rc;
3462         ENTRY;
3463
3464         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_MATCH))
3465                 RETURN(-EIO);
3466
3467         /* Filesystem lock extents are extended to page boundaries so that
3468          * dealing with the page cache is a little smoother */
3469         policy->l_extent.start -= policy->l_extent.start & ~CFS_PAGE_MASK;
3470         policy->l_extent.end |= ~CFS_PAGE_MASK;
3471
3472         /* Next, search for already existing extent locks that will cover us */
3473         /* If we're trying to read, we also search for an existing PW lock.  The
3474          * VFS and page cache already protect us locally, so lots of readers/
3475          * writers can share a single PW lock. */
3476         rc = mode;
3477         if (mode == LCK_PR)
3478                 rc |= LCK_PW;
3479         rc = ldlm_lock_match(obd->obd_namespace, lflags,
3480                              res_id, type, policy, rc, lockh, unref);
3481         if (rc) {
3482                 if (data != NULL)
3483                         osc_set_data_with_check(lockh, data, lflags);
3484                 if (!(lflags & LDLM_FL_TEST_LOCK) && mode != rc) {
3485                         ldlm_lock_addref(lockh, LCK_PR);
3486                         ldlm_lock_decref(lockh, LCK_PW);
3487                 }
3488                 RETURN(rc);
3489         }
3490         RETURN(rc);
3491 }
3492
3493 int osc_cancel_base(struct lustre_handle *lockh, __u32 mode)
3494 {
3495         ENTRY;
3496
3497         if (unlikely(mode == LCK_GROUP))
3498                 ldlm_lock_decref_and_cancel(lockh, mode);
3499         else
3500                 ldlm_lock_decref(lockh, mode);
3501
3502         RETURN(0);
3503 }
3504
3505 static int osc_cancel(struct obd_export *exp, struct lov_stripe_md *md,
3506                       __u32 mode, struct lustre_handle *lockh)
3507 {
3508         ENTRY;
3509         RETURN(osc_cancel_base(lockh, mode));
3510 }
3511
3512 static int osc_cancel_unused(struct obd_export *exp,
3513                              struct lov_stripe_md *lsm,
3514                              ldlm_cancel_flags_t flags,
3515                              void *opaque)
3516 {
3517         struct obd_device *obd = class_exp2obd(exp);
3518         struct ldlm_res_id res_id, *resp = NULL;
3519
3520         if (lsm != NULL) {
3521                 resp = osc_build_res_name(lsm->lsm_object_id,
3522                                           lsm->lsm_object_seq, &res_id);
3523         }
3524
3525         return ldlm_cli_cancel_unused(obd->obd_namespace, resp, flags, opaque);
3526 }
3527
3528 static int osc_statfs_interpret(const struct lu_env *env,
3529                                 struct ptlrpc_request *req,
3530                                 struct osc_async_args *aa, int rc)
3531 {
3532         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
3533         struct obd_statfs *msfs;
3534         __u64 used;
3535         ENTRY;
3536
3537         if (rc == -EBADR)
3538                 /* The request has in fact never been sent
3539                  * due to issues at a higher level (LOV).
3540                  * Exit immediately since the caller is
3541                  * aware of the problem and takes care
3542                  * of the clean up */
3543                  RETURN(rc);
3544
3545         if ((rc == -ENOTCONN || rc == -EAGAIN) &&
3546             (aa->aa_oi->oi_flags & OBD_STATFS_NODELAY))
3547                 GOTO(out, rc = 0);
3548
3549         if (rc != 0)
3550                 GOTO(out, rc);
3551
3552         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
3553         if (msfs == NULL) {
3554                 GOTO(out, rc = -EPROTO);
3555         }
3556
3557         /* Reinitialize the RDONLY and DEGRADED flags at the client
3558          * on each statfs, so they don't stay set permanently. */
3559         cfs_spin_lock(&cli->cl_oscc.oscc_lock);
3560
3561         if (unlikely(msfs->os_state & OS_STATE_DEGRADED))
3562                 cli->cl_oscc.oscc_flags |= OSCC_FLAG_DEGRADED;
3563         else if (unlikely(cli->cl_oscc.oscc_flags & OSCC_FLAG_DEGRADED))
3564                 cli->cl_oscc.oscc_flags &= ~OSCC_FLAG_DEGRADED;
3565
3566         if (unlikely(msfs->os_state & OS_STATE_READONLY))
3567                 cli->cl_oscc.oscc_flags |= OSCC_FLAG_RDONLY;
3568         else if (unlikely(cli->cl_oscc.oscc_flags & OSCC_FLAG_RDONLY))
3569                 cli->cl_oscc.oscc_flags &= ~OSCC_FLAG_RDONLY;
3570
3571         /* Add a bit of hysteresis so this flag isn't continually flapping,
3572          * and ensure that new files don't get extremely fragmented due to
3573          * only a small amount of available space in the filesystem.
3574          * We want to set the NOSPC flag when there is less than ~0.1% free
3575          * and clear it when there is at least ~0.2% free space, so:
3576          *                   avail < ~0.1% max          max = avail + used
3577          *            1025 * avail < avail + used       used = blocks - free
3578          *            1024 * avail < used
3579          *            1024 * avail < blocks - free                      
3580          *                   avail < ((blocks - free) >> 10)    
3581          *
3582          * On very large disk, say 16TB 0.1% will be 16 GB. We don't want to
3583          * lose that amount of space so in those cases we report no space left
3584          * if their is less than 1 GB left.                             */
3585         used = min_t(__u64,(msfs->os_blocks - msfs->os_bfree) >> 10, 1 << 30);
3586         if (unlikely(((cli->cl_oscc.oscc_flags & OSCC_FLAG_NOSPC) == 0) &&
3587                      ((msfs->os_ffree < 32) || (msfs->os_bavail < used))))
3588                 cli->cl_oscc.oscc_flags |= OSCC_FLAG_NOSPC;
3589         else if (unlikely(((cli->cl_oscc.oscc_flags & OSCC_FLAG_NOSPC) != 0) &&
3590                 (msfs->os_ffree > 64) && (msfs->os_bavail > (used << 1))))
3591                         cli->cl_oscc.oscc_flags &= ~OSCC_FLAG_NOSPC;
3592
3593         cfs_spin_unlock(&cli->cl_oscc.oscc_lock);
3594
3595         *aa->aa_oi->oi_osfs = *msfs;
3596 out:
3597         rc = aa->aa_oi->oi_cb_up(aa->aa_oi, rc);
3598         RETURN(rc);
3599 }
3600
3601 static int osc_statfs_async(struct obd_device *obd, struct obd_info *oinfo,
3602                             __u64 max_age, struct ptlrpc_request_set *rqset)
3603 {
3604         struct ptlrpc_request *req;
3605         struct osc_async_args *aa;
3606         int                    rc;
3607         ENTRY;
3608
3609         /* We could possibly pass max_age in the request (as an absolute
3610          * timestamp or a "seconds.usec ago") so the target can avoid doing
3611          * extra calls into the filesystem if that isn't necessary (e.g.
3612          * during mount that would help a bit).  Having relative timestamps
3613          * is not so great if request processing is slow, while absolute
3614          * timestamps are not ideal because they need time synchronization. */
3615         req = ptlrpc_request_alloc(obd->u.cli.cl_import, &RQF_OST_STATFS);
3616         if (req == NULL)
3617                 RETURN(-ENOMEM);
3618
3619         rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS);
3620         if (rc) {
3621                 ptlrpc_request_free(req);
3622                 RETURN(rc);
3623         }
3624         ptlrpc_request_set_replen(req);
3625         req->rq_request_portal = OST_CREATE_PORTAL;
3626         ptlrpc_at_set_req_timeout(req);
3627
3628         if (oinfo->oi_flags & OBD_STATFS_NODELAY) {
3629                 /* procfs requests not want stat in wait for avoid deadlock */
3630                 req->rq_no_resend = 1;
3631                 req->rq_no_delay = 1;
3632         }
3633
3634         req->rq_interpret_reply = (ptlrpc_interpterer_t)osc_statfs_interpret;
3635         CLASSERT (sizeof(*aa) <= sizeof(req->rq_async_args));
3636         aa = ptlrpc_req_async_args(req);
3637         aa->aa_oi = oinfo;
3638
3639         ptlrpc_set_add_req(rqset, req);
3640         RETURN(0);
3641 }
3642
3643 static int osc_statfs(struct obd_device *obd, struct obd_statfs *osfs,