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LU-2430 mdt: Add global rename lock.
[fs/lustre-release.git] / lustre / mdt / mdt_handler.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 only,
8  * as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * General Public License version 2 for more details (a copy is included
14  * in the LICENSE file that accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License
17  * version 2 along with this program; If not, see
18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19  *
20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21  * CA 95054 USA or visit www.sun.com if you need additional information or
22  * have any questions.
23  *
24  * GPL HEADER END
25  */
26 /*
27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28  * Use is subject to license terms.
29  *
30  * Copyright (c) 2010, 2013, Intel Corporation.
31  */
32 /*
33  * This file is part of Lustre, http://www.lustre.org/
34  * Lustre is a trademark of Sun Microsystems, Inc.
35  *
36  * lustre/mdt/mdt_handler.c
37  *
38  * Lustre Metadata Target (mdt) request handler
39  *
40  * Author: Peter Braam <braam@clusterfs.com>
41  * Author: Andreas Dilger <adilger@clusterfs.com>
42  * Author: Phil Schwan <phil@clusterfs.com>
43  * Author: Mike Shaver <shaver@clusterfs.com>
44  * Author: Nikita Danilov <nikita@clusterfs.com>
45  * Author: Huang Hua <huanghua@clusterfs.com>
46  * Author: Yury Umanets <umka@clusterfs.com>
47  */
48
49 #define DEBUG_SUBSYSTEM S_MDS
50
51 #include <linux/module.h>
52 /*
53  * struct OBD_{ALLOC,FREE}*()
54  */
55 #include <obd_support.h>
56 /* struct ptlrpc_request */
57 #include <lustre_net.h>
58 /* struct obd_export */
59 #include <lustre_export.h>
60 /* struct obd_device */
61 #include <obd.h>
62 /* lu2dt_dev() */
63 #include <dt_object.h>
64 #include <lustre_mds.h>
65 #include <lustre_log.h>
66 #include "mdt_internal.h"
67 #include <lustre_acl.h>
68 #include <lustre_param.h>
69 #include <lustre_quota.h>
70 #include <lustre_lfsck.h>
71
72 mdl_mode_t mdt_mdl_lock_modes[] = {
73         [LCK_MINMODE] = MDL_MINMODE,
74         [LCK_EX]      = MDL_EX,
75         [LCK_PW]      = MDL_PW,
76         [LCK_PR]      = MDL_PR,
77         [LCK_CW]      = MDL_CW,
78         [LCK_CR]      = MDL_CR,
79         [LCK_NL]      = MDL_NL,
80         [LCK_GROUP]   = MDL_GROUP
81 };
82
83 ldlm_mode_t mdt_dlm_lock_modes[] = {
84         [MDL_MINMODE] = LCK_MINMODE,
85         [MDL_EX]      = LCK_EX,
86         [MDL_PW]      = LCK_PW,
87         [MDL_PR]      = LCK_PR,
88         [MDL_CW]      = LCK_CW,
89         [MDL_CR]      = LCK_CR,
90         [MDL_NL]      = LCK_NL,
91         [MDL_GROUP]   = LCK_GROUP
92 };
93
94 static struct mdt_device *mdt_dev(struct lu_device *d);
95 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags);
96
97 static const struct lu_object_operations mdt_obj_ops;
98
99 /* Slab for MDT object allocation */
100 static struct kmem_cache *mdt_object_kmem;
101
102 /* For HSM restore handles */
103 struct kmem_cache *mdt_hsm_cdt_kmem;
104
105 /* For HSM request handles */
106 struct kmem_cache *mdt_hsm_car_kmem;
107
108 static struct lu_kmem_descr mdt_caches[] = {
109         {
110                 .ckd_cache = &mdt_object_kmem,
111                 .ckd_name  = "mdt_obj",
112                 .ckd_size  = sizeof(struct mdt_object)
113         },
114         {
115                 .ckd_cache      = &mdt_hsm_cdt_kmem,
116                 .ckd_name       = "mdt_cdt_restore_handle",
117                 .ckd_size       = sizeof(struct cdt_restore_handle)
118         },
119         {
120                 .ckd_cache      = &mdt_hsm_car_kmem,
121                 .ckd_name       = "mdt_cdt_agent_req",
122                 .ckd_size       = sizeof(struct cdt_agent_req)
123         },
124         {
125                 .ckd_cache = NULL
126         }
127 };
128
129 int mdt_get_disposition(struct ldlm_reply *rep, int flag)
130 {
131         if (!rep)
132                 return 0;
133         return (rep->lock_policy_res1 & flag);
134 }
135
136 void mdt_clear_disposition(struct mdt_thread_info *info,
137                            struct ldlm_reply *rep, int flag)
138 {
139         if (info) {
140                 info->mti_opdata &= ~flag;
141                 tgt_opdata_clear(info->mti_env, flag);
142         }
143         if (rep)
144                 rep->lock_policy_res1 &= ~flag;
145 }
146
147 void mdt_set_disposition(struct mdt_thread_info *info,
148                          struct ldlm_reply *rep, int flag)
149 {
150         if (info) {
151                 info->mti_opdata |= flag;
152                 tgt_opdata_set(info->mti_env, flag);
153         }
154         if (rep)
155                 rep->lock_policy_res1 |= flag;
156 }
157
158 void mdt_lock_reg_init(struct mdt_lock_handle *lh, ldlm_mode_t lm)
159 {
160         lh->mlh_pdo_hash = 0;
161         lh->mlh_reg_mode = lm;
162         lh->mlh_rreg_mode = lm;
163         lh->mlh_type = MDT_REG_LOCK;
164 }
165
166 void mdt_lock_pdo_init(struct mdt_lock_handle *lh, ldlm_mode_t lock_mode,
167                        const struct lu_name *lname)
168 {
169         lh->mlh_reg_mode = lock_mode;
170         lh->mlh_rreg_mode = lock_mode;
171         lh->mlh_type = MDT_PDO_LOCK;
172
173         if (lu_name_is_valid(lname)) {
174                 lh->mlh_pdo_hash = full_name_hash(lname->ln_name,
175                                                   lname->ln_namelen);
176                 /* XXX Workaround for LU-2856
177                  *
178                  * Zero is a valid return value of full_name_hash, but
179                  * several users of mlh_pdo_hash assume a non-zero
180                  * hash value. We therefore map zero onto an
181                  * arbitrary, but consistent value (1) to avoid
182                  * problems further down the road. */
183                 if (unlikely(lh->mlh_pdo_hash == 0))
184                         lh->mlh_pdo_hash = 1;
185         } else {
186                 lh->mlh_pdo_hash = 0;
187         }
188 }
189
190 static void mdt_lock_pdo_mode(struct mdt_thread_info *info, struct mdt_object *o,
191                               struct mdt_lock_handle *lh)
192 {
193         mdl_mode_t mode;
194         ENTRY;
195
196         /*
197          * Any dir access needs couple of locks:
198          *
199          * 1) on part of dir we gonna take lookup/modify;
200          *
201          * 2) on whole dir to protect it from concurrent splitting and/or to
202          * flush client's cache for readdir().
203          *
204          * so, for a given mode and object this routine decides what lock mode
205          * to use for lock #2:
206          *
207          * 1) if caller's gonna lookup in dir then we need to protect dir from
208          * being splitted only - LCK_CR
209          *
210          * 2) if caller's gonna modify dir then we need to protect dir from
211          * being splitted and to flush cache - LCK_CW
212          *
213          * 3) if caller's gonna modify dir and that dir seems ready for
214          * splitting then we need to protect it from any type of access
215          * (lookup/modify/split) - LCK_EX --bzzz
216          */
217
218         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
219         LASSERT(lh->mlh_pdo_mode == LCK_MINMODE);
220
221         /*
222          * Ask underlaying level its opinion about preferable PDO lock mode
223          * having access type passed as regular lock mode:
224          *
225          * - MDL_MINMODE means that lower layer does not want to specify lock
226          * mode;
227          *
228          * - MDL_NL means that no PDO lock should be taken. This is used in some
229          * cases. Say, for non-splittable directories no need to use PDO locks
230          * at all.
231          */
232         mode = mdo_lock_mode(info->mti_env, mdt_object_child(o),
233                              mdt_dlm_mode2mdl_mode(lh->mlh_reg_mode));
234
235         if (mode != MDL_MINMODE) {
236                 lh->mlh_pdo_mode = mdt_mdl_mode2dlm_mode(mode);
237         } else {
238                 /*
239                  * Lower layer does not want to specify locking mode. We do it
240                  * our selves. No special protection is needed, just flush
241                  * client's cache on modification and allow concurrent
242                  * mondification.
243                  */
244                 switch (lh->mlh_reg_mode) {
245                 case LCK_EX:
246                         lh->mlh_pdo_mode = LCK_EX;
247                         break;
248                 case LCK_PR:
249                         lh->mlh_pdo_mode = LCK_CR;
250                         break;
251                 case LCK_PW:
252                         lh->mlh_pdo_mode = LCK_CW;
253                         break;
254                 default:
255                         CERROR("Not expected lock type (0x%x)\n",
256                                (int)lh->mlh_reg_mode);
257                         LBUG();
258                 }
259         }
260
261         LASSERT(lh->mlh_pdo_mode != LCK_MINMODE);
262         EXIT;
263 }
264
265 int mdt_getstatus(struct tgt_session_info *tsi)
266 {
267         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
268         struct mdt_device       *mdt = info->mti_mdt;
269         struct mdt_body         *repbody;
270         int                      rc;
271
272         ENTRY;
273
274         rc = mdt_check_ucred(info);
275         if (rc)
276                 GOTO(out, rc = err_serious(rc));
277
278         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETSTATUS_PACK))
279                 GOTO(out, rc = err_serious(-ENOMEM));
280
281         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
282         repbody->fid1 = mdt->mdt_md_root_fid;
283         repbody->valid |= OBD_MD_FLID;
284
285         if (tsi->tsi_tgt->lut_mds_capa &&
286             exp_connect_flags(info->mti_exp) & OBD_CONNECT_MDS_CAPA) {
287                 struct mdt_object       *root;
288                 struct lustre_capa      *capa;
289
290                 root = mdt_object_find(info->mti_env, mdt, &repbody->fid1);
291                 if (IS_ERR(root))
292                         GOTO(out, rc = PTR_ERR(root));
293
294                 capa = req_capsule_server_get(info->mti_pill, &RMF_CAPA1);
295                 LASSERT(capa);
296                 capa->lc_opc = CAPA_OPC_MDS_DEFAULT;
297                 rc = mo_capa_get(info->mti_env, mdt_object_child(root), capa,
298                                  0);
299                 mdt_object_put(info->mti_env, root);
300                 if (rc == 0)
301                         repbody->valid |= OBD_MD_FLMDSCAPA;
302         }
303         EXIT;
304 out:
305         mdt_thread_info_fini(info);
306         return rc;
307 }
308
309 int mdt_statfs(struct tgt_session_info *tsi)
310 {
311         struct ptlrpc_request           *req = tgt_ses_req(tsi);
312         struct mdt_thread_info          *info = tsi2mdt_info(tsi);
313         struct md_device                *next = info->mti_mdt->mdt_child;
314         struct ptlrpc_service_part      *svcpt;
315         struct obd_statfs               *osfs;
316         int                             rc;
317
318         ENTRY;
319
320         svcpt = req->rq_rqbd->rqbd_svcpt;
321
322         /* This will trigger a watchdog timeout */
323         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_STATFS_LCW_SLEEP,
324                          (MDT_SERVICE_WATCHDOG_FACTOR *
325                           at_get(&svcpt->scp_at_estimate)) + 1);
326
327         rc = mdt_check_ucred(info);
328         if (rc)
329                 GOTO(out, rc = err_serious(rc));
330
331         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_PACK))
332                 GOTO(out, rc = err_serious(-ENOMEM));
333
334         osfs = req_capsule_server_get(info->mti_pill, &RMF_OBD_STATFS);
335         if (!osfs)
336                 GOTO(out, rc = -EPROTO);
337
338         /** statfs information are cached in the mdt_device */
339         if (cfs_time_before_64(info->mti_mdt->mdt_osfs_age,
340                                cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS))) {
341                 /** statfs data is too old, get up-to-date one */
342                 rc = next->md_ops->mdo_statfs(info->mti_env, next, osfs);
343                 if (rc)
344                         GOTO(out, rc);
345                 spin_lock(&info->mti_mdt->mdt_osfs_lock);
346                 info->mti_mdt->mdt_osfs = *osfs;
347                 info->mti_mdt->mdt_osfs_age = cfs_time_current_64();
348                 spin_unlock(&info->mti_mdt->mdt_osfs_lock);
349         } else {
350                 /** use cached statfs data */
351                 spin_lock(&info->mti_mdt->mdt_osfs_lock);
352                 *osfs = info->mti_mdt->mdt_osfs;
353                 spin_unlock(&info->mti_mdt->mdt_osfs_lock);
354         }
355
356         if (rc == 0)
357                 mdt_counter_incr(req, LPROC_MDT_STATFS);
358 out:
359         mdt_thread_info_fini(info);
360         RETURN(rc);
361 }
362
363 /**
364  * Pack SOM attributes into the reply.
365  * Call under a DLM UPDATE lock.
366  */
367 static void mdt_pack_size2body(struct mdt_thread_info *info,
368                                struct mdt_object *mo)
369 {
370         struct mdt_body *b;
371         struct md_attr *ma = &info->mti_attr;
372
373         LASSERT(ma->ma_attr.la_valid & LA_MODE);
374         b = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
375
376         /* Check if Size-on-MDS is supported, if this is a regular file,
377          * if SOM is enabled on the object and if SOM cache exists and valid.
378          * Otherwise do not pack Size-on-MDS attributes to the reply. */
379         if (!(mdt_conn_flags(info) & OBD_CONNECT_SOM) ||
380             !S_ISREG(ma->ma_attr.la_mode) ||
381             !mdt_object_is_som_enabled(mo) ||
382             !(ma->ma_valid & MA_SOM))
383                 return;
384
385         b->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
386         b->size = ma->ma_som->msd_size;
387         b->blocks = ma->ma_som->msd_blocks;
388 }
389
390 void mdt_pack_attr2body(struct mdt_thread_info *info, struct mdt_body *b,
391                         const struct lu_attr *attr, const struct lu_fid *fid)
392 {
393         struct md_attr *ma = &info->mti_attr;
394
395         LASSERT(ma->ma_valid & MA_INODE);
396
397         b->atime      = attr->la_atime;
398         b->mtime      = attr->la_mtime;
399         b->ctime      = attr->la_ctime;
400         b->mode       = attr->la_mode;
401         b->size       = attr->la_size;
402         b->blocks     = attr->la_blocks;
403         b->uid        = attr->la_uid;
404         b->gid        = attr->la_gid;
405         b->flags      = attr->la_flags;
406         b->nlink      = attr->la_nlink;
407         b->rdev       = attr->la_rdev;
408
409         /*XXX should pack the reply body according to lu_valid*/
410         b->valid |= OBD_MD_FLCTIME | OBD_MD_FLUID   |
411                     OBD_MD_FLGID   | OBD_MD_FLTYPE  |
412                     OBD_MD_FLMODE  | OBD_MD_FLNLINK | OBD_MD_FLFLAGS |
413                     OBD_MD_FLATIME | OBD_MD_FLMTIME ;
414
415         if (!S_ISREG(attr->la_mode)) {
416                 b->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS | OBD_MD_FLRDEV;
417         } else if (ma->ma_need & MA_LOV && !(ma->ma_valid & MA_LOV)) {
418                 /* means no objects are allocated on osts. */
419                 LASSERT(!(ma->ma_valid & MA_LOV));
420                 /* just ignore blocks occupied by extend attributes on MDS */
421                 b->blocks = 0;
422                 /* if no object is allocated on osts, the size on mds is valid. b=22272 */
423                 b->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
424         } else if ((ma->ma_valid & MA_LOV) && ma->ma_lmm != NULL &&
425                    ma->ma_lmm->lmm_pattern & LOV_PATTERN_F_RELEASED) {
426                 /* A released file stores its size on MDS. */
427                 /* But return 1 block for released file, unless tools like tar
428                  * will consider it fully sparse. (LU-3864)
429                  */
430                 if (unlikely(b->size == 0))
431                         b->blocks = 0;
432                 else
433                         b->blocks = 1;
434                 b->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
435         }
436
437         if (fid) {
438                 b->fid1 = *fid;
439                 b->valid |= OBD_MD_FLID;
440                 CDEBUG(D_INODE, DFID": nlink=%d, mode=%o, size="LPU64"\n",
441                                 PFID(fid), b->nlink, b->mode, b->size);
442         }
443
444         if (info)
445                 mdt_body_reverse_idmap(info, b);
446
447         if (fid != NULL && (b->valid & OBD_MD_FLSIZE))
448                 CDEBUG(D_VFSTRACE, DFID": returning size %llu\n",
449                        PFID(fid), (unsigned long long)b->size);
450 }
451
452 static inline int mdt_body_has_lov(const struct lu_attr *la,
453                                    const struct mdt_body *body)
454 {
455         return ((S_ISREG(la->la_mode) && (body->valid & OBD_MD_FLEASIZE)) ||
456                 (S_ISDIR(la->la_mode) && (body->valid & OBD_MD_FLDIREA )) );
457 }
458
459 void mdt_client_compatibility(struct mdt_thread_info *info)
460 {
461         struct mdt_body       *body;
462         struct ptlrpc_request *req = mdt_info_req(info);
463         struct obd_export     *exp = req->rq_export;
464         struct md_attr        *ma = &info->mti_attr;
465         struct lu_attr        *la = &ma->ma_attr;
466         ENTRY;
467
468         if (exp_connect_layout(exp))
469                 /* the client can deal with 16-bit lmm_stripe_count */
470                 RETURN_EXIT;
471
472         body = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
473
474         if (!mdt_body_has_lov(la, body))
475                 RETURN_EXIT;
476
477         /* now we have a reply with a lov for a client not compatible with the
478          * layout lock so we have to clean the layout generation number */
479         if (S_ISREG(la->la_mode))
480                 ma->ma_lmm->lmm_layout_gen = 0;
481         EXIT;
482 }
483
484 static int mdt_big_xattr_get(struct mdt_thread_info *info, struct mdt_object *o,
485                              const char *name)
486 {
487         const struct lu_env *env = info->mti_env;
488         int rc;
489         ENTRY;
490
491         LASSERT(info->mti_big_lmm_used == 0);
492         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL, name);
493         if (rc < 0)
494                 RETURN(rc);
495
496         /* big_lmm may need to be grown */
497         if (info->mti_big_lmmsize < rc) {
498                 int size = size_roundup_power2(rc);
499
500                 if (info->mti_big_lmmsize > 0) {
501                         /* free old buffer */
502                         LASSERT(info->mti_big_lmm);
503                         OBD_FREE_LARGE(info->mti_big_lmm,
504                                        info->mti_big_lmmsize);
505                         info->mti_big_lmm = NULL;
506                         info->mti_big_lmmsize = 0;
507                 }
508
509                 OBD_ALLOC_LARGE(info->mti_big_lmm, size);
510                 if (info->mti_big_lmm == NULL)
511                         RETURN(-ENOMEM);
512                 info->mti_big_lmmsize = size;
513         }
514         LASSERT(info->mti_big_lmmsize >= rc);
515
516         info->mti_buf.lb_buf = info->mti_big_lmm;
517         info->mti_buf.lb_len = info->mti_big_lmmsize;
518         rc = mo_xattr_get(env, mdt_object_child(o), &info->mti_buf, name);
519
520         RETURN(rc);
521 }
522
523 int mdt_stripe_get(struct mdt_thread_info *info, struct mdt_object *o,
524                    struct md_attr *ma, const char *name)
525 {
526         struct md_object *next = mdt_object_child(o);
527         struct lu_buf    *buf = &info->mti_buf;
528         int rc;
529
530         if (strcmp(name, XATTR_NAME_LOV) == 0) {
531                 buf->lb_buf = ma->ma_lmm;
532                 buf->lb_len = ma->ma_lmm_size;
533                 LASSERT(!(ma->ma_valid & MA_LOV));
534         } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
535                 buf->lb_buf = ma->ma_lmv;
536                 buf->lb_len = ma->ma_lmv_size;
537                 LASSERT(!(ma->ma_valid & MA_LMV));
538         } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
539                 buf->lb_buf = ma->ma_lmv;
540                 buf->lb_len = ma->ma_lmv_size;
541                 LASSERT(!(ma->ma_valid & MA_LMV_DEF));
542         } else {
543                 return -EINVAL;
544         }
545
546         rc = mo_xattr_get(info->mti_env, next, buf, name);
547         if (rc > 0) {
548                 if (strcmp(name, XATTR_NAME_LOV) == 0) {
549                         ma->ma_lmm_size = rc;
550                         ma->ma_valid |= MA_LOV;
551                 } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
552                         ma->ma_lmv_size = rc;
553                         ma->ma_valid |= MA_LMV;
554                 } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
555                         ma->ma_lmv_size = rc;
556                         ma->ma_valid |= MA_LMV_DEF;
557                 }
558
559                 rc = 0;
560         } else if (rc == -ENODATA) {
561                 /* no LOV EA */
562                 rc = 0;
563         } else if (rc == -ERANGE) {
564                 /* Default LMV has fixed size, so it must be able to fit
565                  * in the original buffer */
566                 if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0)
567                         return rc;
568                 rc = mdt_big_xattr_get(info, o, name);
569                 if (rc > 0) {
570                         info->mti_big_lmm_used = 1;
571                         if (!strcmp(name, XATTR_NAME_LOV)) {
572                                 ma->ma_valid |= MA_LOV;
573                                 ma->ma_lmm = info->mti_big_lmm;
574                                 ma->ma_lmm_size = rc;
575                         } else if (!strcmp(name, XATTR_NAME_LMV)) {
576                                 ma->ma_valid |= MA_LMV;
577                                 ma->ma_lmv = info->mti_big_lmm;
578                                 ma->ma_lmv_size = rc;
579                         } else {
580                                 return -EINVAL;
581                         }
582
583                         /* update mdt_max_mdsize so all clients
584                          * will be aware about that */
585                         if (info->mti_mdt->mdt_max_mdsize < rc)
586                                 info->mti_mdt->mdt_max_mdsize = rc;
587                         rc = 0;
588                 }
589         }
590
591         return rc;
592 }
593
594 int mdt_attr_get_pfid(struct mdt_thread_info *info,
595                       struct mdt_object *o, struct lu_fid *pfid)
596 {
597         struct lu_buf           *buf = &info->mti_buf;
598         struct link_ea_header   *leh;
599         struct link_ea_entry    *lee;
600         int                      rc;
601         ENTRY;
602
603         buf->lb_buf = info->mti_big_lmm;
604         buf->lb_len = info->mti_big_lmmsize;
605         rc = mo_xattr_get(info->mti_env, mdt_object_child(o),
606                           buf, XATTR_NAME_LINK);
607         /* ignore errors, MA_PFID won't be set and it is
608          * up to the caller to treat this as an error */
609         if (rc == -ERANGE || buf->lb_len == 0) {
610                 rc = mdt_big_xattr_get(info, o, XATTR_NAME_LINK);
611                 buf->lb_buf = info->mti_big_lmm;
612                 buf->lb_len = info->mti_big_lmmsize;
613         }
614
615         if (rc < 0)
616                 RETURN(rc);
617         if (rc < sizeof(*leh)) {
618                 CERROR("short LinkEA on "DFID": rc = %d\n",
619                        PFID(mdt_object_fid(o)), rc);
620                 RETURN(-ENODATA);
621         }
622
623         leh = (struct link_ea_header *) buf->lb_buf;
624         lee = (struct link_ea_entry *)(leh + 1);
625         if (leh->leh_magic == __swab32(LINK_EA_MAGIC)) {
626                 leh->leh_magic = LINK_EA_MAGIC;
627                 leh->leh_reccount = __swab32(leh->leh_reccount);
628                 leh->leh_len = __swab64(leh->leh_len);
629         }
630         if (leh->leh_magic != LINK_EA_MAGIC)
631                 RETURN(-EINVAL);
632         if (leh->leh_reccount == 0)
633                 RETURN(-ENODATA);
634
635         memcpy(pfid, &lee->lee_parent_fid, sizeof(*pfid));
636         fid_be_to_cpu(pfid, pfid);
637
638         RETURN(0);
639 }
640
641 int mdt_attr_get_complex(struct mdt_thread_info *info,
642                          struct mdt_object *o, struct md_attr *ma)
643 {
644         const struct lu_env *env = info->mti_env;
645         struct md_object    *next = mdt_object_child(o);
646         struct lu_buf       *buf = &info->mti_buf;
647         u32                  mode = lu_object_attr(&next->mo_lu);
648         int                  need = ma->ma_need;
649         int                  rc = 0, rc2;
650         ENTRY;
651
652         ma->ma_valid = 0;
653
654         if (need & MA_INODE) {
655                 ma->ma_need = MA_INODE;
656                 rc = mo_attr_get(env, next, ma);
657                 if (rc)
658                         GOTO(out, rc);
659                 ma->ma_valid |= MA_INODE;
660         }
661
662         if (need & MA_PFID) {
663                 rc = mdt_attr_get_pfid(info, o, &ma->ma_pfid);
664                 if (rc == 0)
665                         ma->ma_valid |= MA_PFID;
666                 /* ignore this error, parent fid is not mandatory */
667                 rc = 0;
668         }
669
670         if (need & MA_LOV && (S_ISREG(mode) || S_ISDIR(mode))) {
671                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LOV);
672                 if (rc)
673                         GOTO(out, rc);
674         }
675
676         if (need & MA_LMV && S_ISDIR(mode)) {
677                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LMV);
678                 if (rc != 0)
679                         GOTO(out, rc);
680         }
681
682         if (need & MA_LMV_DEF && S_ISDIR(mode)) {
683                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_DEFAULT_LMV);
684                 if (rc != 0)
685                         GOTO(out, rc);
686         }
687
688         if (need & MA_SOM && S_ISREG(mode)) {
689                 buf->lb_buf = info->mti_xattr_buf;
690                 buf->lb_len = sizeof(info->mti_xattr_buf);
691                 CLASSERT(sizeof(struct som_attrs) <=
692                          sizeof(info->mti_xattr_buf));
693                 rc2 = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_SOM);
694                 rc2 = lustre_buf2som(info->mti_xattr_buf, rc2, ma->ma_som);
695                 if (rc2 == 0)
696                         ma->ma_valid |= MA_SOM;
697                 else if (rc2 < 0 && rc2 != -ENODATA)
698                         GOTO(out, rc = rc2);
699         }
700
701         if (need & MA_HSM && S_ISREG(mode)) {
702                 buf->lb_buf = info->mti_xattr_buf;
703                 buf->lb_len = sizeof(info->mti_xattr_buf);
704                 CLASSERT(sizeof(struct hsm_attrs) <=
705                          sizeof(info->mti_xattr_buf));
706                 rc2 = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_HSM);
707                 rc2 = lustre_buf2hsm(info->mti_xattr_buf, rc2, &ma->ma_hsm);
708                 if (rc2 == 0)
709                         ma->ma_valid |= MA_HSM;
710                 else if (rc2 < 0 && rc2 != -ENODATA)
711                         GOTO(out, rc = rc2);
712         }
713
714 #ifdef CONFIG_FS_POSIX_ACL
715         if (need & MA_ACL_DEF && S_ISDIR(mode)) {
716                 buf->lb_buf = ma->ma_acl;
717                 buf->lb_len = ma->ma_acl_size;
718                 rc2 = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_DEFAULT);
719                 if (rc2 > 0) {
720                         ma->ma_acl_size = rc2;
721                         ma->ma_valid |= MA_ACL_DEF;
722                 } else if (rc2 == -ENODATA) {
723                         /* no ACLs */
724                         ma->ma_acl_size = 0;
725                 } else
726                         GOTO(out, rc = rc2);
727         }
728 #endif
729 out:
730         ma->ma_need = need;
731         CDEBUG(D_INODE, "after getattr rc = %d, ma_valid = "LPX64" ma_lmm=%p\n",
732                rc, ma->ma_valid, ma->ma_lmm);
733         RETURN(rc);
734 }
735
736 static int mdt_getattr_internal(struct mdt_thread_info *info,
737                                 struct mdt_object *o, int ma_need)
738 {
739         struct md_object        *next = mdt_object_child(o);
740         const struct mdt_body   *reqbody = info->mti_body;
741         struct ptlrpc_request   *req = mdt_info_req(info);
742         struct md_attr          *ma = &info->mti_attr;
743         struct lu_attr          *la = &ma->ma_attr;
744         struct req_capsule      *pill = info->mti_pill;
745         const struct lu_env     *env = info->mti_env;
746         struct mdt_body         *repbody;
747         struct lu_buf           *buffer = &info->mti_buf;
748         int                     rc;
749         int                     is_root;
750         ENTRY;
751
752         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK))
753                 RETURN(err_serious(-ENOMEM));
754
755         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
756
757         ma->ma_valid = 0;
758
759         if (mdt_object_remote(o)) {
760                 /* This object is located on remote node.*/
761                 /* Return -EIO for old client */
762                 if (!mdt_is_dne_client(req->rq_export))
763                         GOTO(out, rc = -EIO);
764
765                 repbody->fid1 = *mdt_object_fid(o);
766                 repbody->valid = OBD_MD_FLID | OBD_MD_MDS;
767                 GOTO(out, rc = 0);
768         }
769
770         buffer->lb_len = reqbody->eadatasize;
771         if (buffer->lb_len > 0) {
772                 buffer->lb_buf = req_capsule_server_get(pill, &RMF_MDT_MD);
773                 if (buffer->lb_buf == NULL)
774                         GOTO(out, rc = -EPROTO);
775         } else {
776                 buffer->lb_buf = NULL;
777                 ma_need &= ~(MA_LOV | MA_LMV);
778                 CDEBUG(D_INFO, "%s: RPC from %s: does not need LOVEA.\n",
779                        mdt_obd_name(info->mti_mdt),
780                        req->rq_export->exp_client_uuid.uuid);
781         }
782
783         /* If it is dir object and client require MEA, then we got MEA */
784         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
785             (reqbody->valid & (OBD_MD_MEA | OBD_MD_DEFAULT_MEA))) {
786                 /* Assumption: MDT_MD size is enough for lmv size. */
787                 ma->ma_lmv = buffer->lb_buf;
788                 ma->ma_lmv_size = buffer->lb_len;
789                 ma->ma_need = MA_INODE;
790                 if (ma->ma_lmv_size > 0) {
791                         if (reqbody->valid & OBD_MD_MEA)
792                                 ma->ma_need |= MA_LMV;
793                         else if (reqbody->valid & OBD_MD_DEFAULT_MEA)
794                                 ma->ma_need |= MA_LMV_DEF;
795                 }
796         } else {
797                 ma->ma_lmm = buffer->lb_buf;
798                 ma->ma_lmm_size = buffer->lb_len;
799                 ma->ma_need = MA_INODE | MA_HSM;
800                 if (ma->ma_lmm_size > 0)
801                         ma->ma_need |= MA_LOV;
802         }
803
804         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
805             reqbody->valid & OBD_MD_FLDIREA  &&
806             lustre_msg_get_opc(req->rq_reqmsg) == MDS_GETATTR) {
807                 /* get default stripe info for this dir. */
808                 ma->ma_need |= MA_LOV_DEF;
809         }
810         ma->ma_need |= ma_need;
811         if (ma->ma_need & MA_SOM)
812                 ma->ma_som = &info->mti_u.som.data;
813
814         rc = mdt_attr_get_complex(info, o, ma);
815         if (unlikely(rc)) {
816                 CERROR("%s: getattr error for "DFID": rc = %d\n",
817                        mdt_obd_name(info->mti_mdt),
818                        PFID(mdt_object_fid(o)), rc);
819                 RETURN(rc);
820         }
821
822         /* if file is released, check if a restore is running */
823         if ((ma->ma_valid & MA_HSM) && (ma->ma_hsm.mh_flags & HS_RELEASED) &&
824             mdt_hsm_restore_is_running(info, mdt_object_fid(o))) {
825                 repbody->t_state = MS_RESTORE;
826                 repbody->valid |= OBD_MD_TSTATE;
827         }
828
829         is_root = lu_fid_eq(mdt_object_fid(o), &info->mti_mdt->mdt_md_root_fid);
830
831         /* the Lustre protocol supposes to return default striping
832          * on the user-visible root if explicitly requested */
833         if ((ma->ma_valid & MA_LOV) == 0 && S_ISDIR(la->la_mode) &&
834             (ma->ma_need & MA_LOV_DEF && is_root) && ma->ma_need & MA_LOV) {
835                 struct lu_fid      rootfid;
836                 struct mdt_object *root;
837                 struct mdt_device *mdt = info->mti_mdt;
838
839                 rc = dt_root_get(env, mdt->mdt_bottom, &rootfid);
840                 if (rc)
841                         RETURN(rc);
842                 root = mdt_object_find(env, mdt, &rootfid);
843                 if (IS_ERR(root))
844                         RETURN(PTR_ERR(root));
845                 rc = mdt_stripe_get(info, root, ma, XATTR_NAME_LOV);
846                 mdt_object_put(info->mti_env, root);
847                 if (unlikely(rc)) {
848                         CERROR("%s: getattr error for "DFID": rc = %d\n",
849                                mdt_obd_name(info->mti_mdt),
850                                PFID(mdt_object_fid(o)), rc);
851                         RETURN(rc);
852                 }
853         }
854
855         if (likely(ma->ma_valid & MA_INODE))
856                 mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
857         else
858                 RETURN(-EFAULT);
859
860         if (mdt_body_has_lov(la, reqbody)) {
861                 if (ma->ma_valid & MA_LOV) {
862                         LASSERT(ma->ma_lmm_size);
863                         mdt_dump_lmm(D_INFO, ma->ma_lmm);
864                         repbody->eadatasize = ma->ma_lmm_size;
865                         if (S_ISDIR(la->la_mode))
866                                 repbody->valid |= OBD_MD_FLDIREA;
867                         else
868                                 repbody->valid |= OBD_MD_FLEASIZE;
869                 }
870                 if (ma->ma_valid & MA_LMV) {
871                         LASSERT(S_ISDIR(la->la_mode));
872                         mdt_dump_lmv(D_INFO, ma->ma_lmv);
873                         repbody->eadatasize = ma->ma_lmv_size;
874                         repbody->valid |= (OBD_MD_FLDIREA|OBD_MD_MEA);
875                 }
876                 if (ma->ma_valid & MA_LMV_DEF) {
877                         LASSERT(S_ISDIR(la->la_mode));
878                         repbody->eadatasize = ma->ma_lmv_size;
879                         repbody->valid |= (OBD_MD_FLDIREA|OBD_MD_DEFAULT_MEA);
880                 }
881         } else if (S_ISLNK(la->la_mode) &&
882                    reqbody->valid & OBD_MD_LINKNAME) {
883                 buffer->lb_buf = ma->ma_lmm;
884                 /* eadatasize from client includes NULL-terminator, so
885                  * there is no need to read it */
886                 buffer->lb_len = reqbody->eadatasize - 1;
887                 rc = mo_readlink(env, next, buffer);
888                 if (unlikely(rc <= 0)) {
889                         CERROR("%s: readlink failed for "DFID": rc = %d\n",
890                                mdt_obd_name(info->mti_mdt),
891                                PFID(mdt_object_fid(o)), rc);
892                         rc = -EFAULT;
893                 } else {
894                         int print_limit = min_t(int, PAGE_CACHE_SIZE - 128, rc);
895
896                         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READLINK_EPROTO))
897                                 rc -= 2;
898                         repbody->valid |= OBD_MD_LINKNAME;
899                         /* we need to report back size with NULL-terminator
900                          * because client expects that */
901                         repbody->eadatasize = rc + 1;
902                         if (repbody->eadatasize != reqbody->eadatasize)
903                                 CDEBUG(D_INODE, "%s: Read shorter symlink %d "
904                                        "on "DFID ", expected %d\n",
905                                        mdt_obd_name(info->mti_mdt),
906                                        rc, PFID(mdt_object_fid(o)),
907                                        reqbody->eadatasize - 1);
908                         /* NULL terminate */
909                         ((char *)ma->ma_lmm)[rc] = 0;
910
911                         /* If the total CDEBUG() size is larger than a page, it
912                          * will print a warning to the console, avoid this by
913                          * printing just the last part of the symlink. */
914                         CDEBUG(D_INODE, "symlink dest %s%.*s, len = %d\n",
915                                print_limit < rc ? "..." : "", print_limit,
916                                (char *)ma->ma_lmm + rc - print_limit, rc);
917                         rc = 0;
918                 }
919         }
920
921         if (reqbody->valid & OBD_MD_FLMODEASIZE) {
922                 repbody->max_cookiesize = 0;
923                 repbody->max_mdsize = info->mti_mdt->mdt_max_mdsize;
924                 repbody->valid |= OBD_MD_FLMODEASIZE;
925                 CDEBUG(D_INODE, "I am going to change the MAX_MD_SIZE & "
926                        "MAX_COOKIE to : %d:%d\n", repbody->max_mdsize,
927                        repbody->max_cookiesize);
928         }
929
930         if (exp_connect_rmtclient(info->mti_exp) &&
931             reqbody->valid & OBD_MD_FLRMTPERM) {
932                 void *buf = req_capsule_server_get(pill, &RMF_ACL);
933
934                 /* mdt_getattr_lock only */
935                 rc = mdt_pack_remote_perm(info, o, buf);
936                 if (rc) {
937                         repbody->valid &= ~OBD_MD_FLRMTPERM;
938                         repbody->aclsize = 0;
939                         RETURN(rc);
940                 } else {
941                         repbody->valid |= OBD_MD_FLRMTPERM;
942                         repbody->aclsize = sizeof(struct mdt_remote_perm);
943                 }
944         }
945 #ifdef CONFIG_FS_POSIX_ACL
946         else if ((exp_connect_flags(req->rq_export) & OBD_CONNECT_ACL) &&
947                  (reqbody->valid & OBD_MD_FLACL)) {
948                 buffer->lb_buf = req_capsule_server_get(pill, &RMF_ACL);
949                 buffer->lb_len = req_capsule_get_size(pill,
950                                                       &RMF_ACL, RCL_SERVER);
951                 if (buffer->lb_len > 0) {
952                         rc = mo_xattr_get(env, next, buffer,
953                                           XATTR_NAME_ACL_ACCESS);
954                         if (rc < 0) {
955                                 if (rc == -ENODATA) {
956                                         repbody->aclsize = 0;
957                                         repbody->valid |= OBD_MD_FLACL;
958                                         rc = 0;
959                                 } else if (rc == -EOPNOTSUPP) {
960                                         rc = 0;
961                                 } else {
962                                         CERROR("%s: unable to read "DFID
963                                                " ACL: rc = %d\n",
964                                                mdt_obd_name(info->mti_mdt),
965                                                PFID(mdt_object_fid(o)), rc);
966                                 }
967                         } else {
968                                 repbody->aclsize = rc;
969                                 repbody->valid |= OBD_MD_FLACL;
970                                 rc = 0;
971                         }
972                 }
973         }
974 #endif
975
976         if (reqbody->valid & OBD_MD_FLMDSCAPA &&
977             info->mti_mdt->mdt_lut.lut_mds_capa &&
978             exp_connect_flags(info->mti_exp) & OBD_CONNECT_MDS_CAPA) {
979                 struct lustre_capa *capa;
980
981                 capa = req_capsule_server_get(pill, &RMF_CAPA1);
982                 LASSERT(capa);
983                 capa->lc_opc = CAPA_OPC_MDS_DEFAULT;
984                 rc = mo_capa_get(env, next, capa, 0);
985                 if (rc)
986                         RETURN(rc);
987                 repbody->valid |= OBD_MD_FLMDSCAPA;
988         }
989
990 out:
991         if (rc == 0)
992                 mdt_counter_incr(req, LPROC_MDT_GETATTR);
993
994         RETURN(rc);
995 }
996
997 static int mdt_renew_capa(struct mdt_thread_info *info)
998 {
999         struct mdt_object  *obj = info->mti_object;
1000         struct mdt_body    *body;
1001         struct lustre_capa *capa, *c;
1002         int rc;
1003         ENTRY;
1004
1005         /* if object doesn't exist, or server has disabled capability,
1006          * return directly, client will find body->valid OBD_MD_FLOSSCAPA
1007          * flag not set.
1008          */
1009         if (!obj || !info->mti_mdt->mdt_lut.lut_oss_capa ||
1010             !(exp_connect_flags(info->mti_exp) & OBD_CONNECT_OSS_CAPA))
1011                 RETURN(0);
1012
1013         body = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1014         LASSERT(body != NULL);
1015
1016         c = req_capsule_client_get(info->mti_pill, &RMF_CAPA1);
1017         LASSERT(c);
1018
1019         capa = req_capsule_server_get(info->mti_pill, &RMF_CAPA2);
1020         LASSERT(capa);
1021
1022         *capa = *c;
1023         rc = mo_capa_get(info->mti_env, mdt_object_child(obj), capa, 1);
1024         if (rc == 0)
1025                 body->valid |= OBD_MD_FLOSSCAPA;
1026         RETURN(rc);
1027 }
1028
1029 int mdt_getattr(struct tgt_session_info *tsi)
1030 {
1031         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1032         struct mdt_object       *obj = info->mti_object;
1033         struct req_capsule      *pill = info->mti_pill;
1034         struct mdt_body         *reqbody;
1035         struct mdt_body         *repbody;
1036         mode_t                   mode;
1037         int rc, rc2;
1038         ENTRY;
1039
1040         reqbody = req_capsule_client_get(pill, &RMF_MDT_BODY);
1041         LASSERT(reqbody);
1042
1043         if (reqbody->valid & OBD_MD_FLOSSCAPA) {
1044                 rc = req_capsule_server_pack(pill);
1045                 if (unlikely(rc))
1046                         RETURN(err_serious(rc));
1047                 rc = mdt_renew_capa(info);
1048                 GOTO(out_shrink, rc);
1049         }
1050
1051         LASSERT(obj != NULL);
1052         LASSERT(lu_object_assert_exists(&obj->mot_obj));
1053
1054         mode = lu_object_attr(&obj->mot_obj);
1055
1056         /* old clients may not report needed easize, use max value then */
1057         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
1058                              reqbody->eadatasize == 0 ?
1059                              info->mti_mdt->mdt_max_mdsize :
1060                              reqbody->eadatasize);
1061
1062         rc = req_capsule_server_pack(pill);
1063         if (unlikely(rc != 0))
1064                 GOTO(out, rc = err_serious(rc));
1065
1066         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1067         LASSERT(repbody != NULL);
1068         repbody->eadatasize = 0;
1069         repbody->aclsize = 0;
1070
1071         if (reqbody->valid & OBD_MD_FLRMTPERM)
1072                 rc = mdt_init_ucred(info, reqbody);
1073         else
1074                 rc = mdt_check_ucred(info);
1075         if (unlikely(rc))
1076                 GOTO(out_shrink, rc);
1077
1078         info->mti_cross_ref = !!(reqbody->valid & OBD_MD_FLCROSSREF);
1079
1080         /*
1081          * Don't check capability at all, because rename might getattr for
1082          * remote obj, and at that time no capability is available.
1083          */
1084         mdt_set_capainfo(info, 1, &reqbody->fid1, BYPASS_CAPA);
1085         rc = mdt_getattr_internal(info, obj, 0);
1086         if (reqbody->valid & OBD_MD_FLRMTPERM)
1087                 mdt_exit_ucred(info);
1088         EXIT;
1089 out_shrink:
1090         mdt_client_compatibility(info);
1091         rc2 = mdt_fix_reply(info);
1092         if (rc == 0)
1093                 rc = rc2;
1094 out:
1095         mdt_thread_info_fini(info);
1096         return rc;
1097 }
1098
1099 int mdt_is_subdir(struct tgt_session_info *tsi)
1100 {
1101         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1102         struct mdt_object     *o = info->mti_object;
1103         struct req_capsule    *pill = info->mti_pill;
1104         const struct mdt_body *body = info->mti_body;
1105         struct mdt_body       *repbody;
1106         int                    rc;
1107         ENTRY;
1108
1109         LASSERT(o != NULL);
1110
1111         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1112
1113         /*
1114          * We save last checked parent fid to @repbody->fid1 for remote
1115          * directory case.
1116          */
1117         LASSERT(fid_is_sane(&body->fid2));
1118         LASSERT(mdt_object_exists(o) && !mdt_object_remote(o));
1119         rc = mdo_is_subdir(info->mti_env, mdt_object_child(o),
1120                            &body->fid2, &repbody->fid1);
1121         if (rc == 0 || rc == -EREMOTE)
1122                 repbody->valid |= OBD_MD_FLID;
1123
1124         mdt_thread_info_fini(info);
1125         RETURN(rc);
1126 }
1127
1128 int mdt_swap_layouts(struct tgt_session_info *tsi)
1129 {
1130         struct mdt_thread_info  *info;
1131         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1132         struct obd_export       *exp = req->rq_export;
1133         struct mdt_object       *o1, *o2, *o;
1134         struct mdt_lock_handle  *lh1, *lh2;
1135         struct mdc_swap_layouts *msl;
1136         int                      rc;
1137         ENTRY;
1138
1139         /* client does not support layout lock, so layout swaping
1140          * is disabled.
1141          * FIXME: there is a problem for old clients which don't support
1142          * layout lock yet. If those clients have already opened the file
1143          * they won't be notified at all so that old layout may still be
1144          * used to do IO. This can be fixed after file release is landed by
1145          * doing exclusive open and taking full EX ibits lock. - Jinshan */
1146         if (!exp_connect_layout(exp))
1147                 RETURN(-EOPNOTSUPP);
1148
1149         info = tsi2mdt_info(tsi);
1150         if (req_capsule_get_size(info->mti_pill, &RMF_CAPA1, RCL_CLIENT))
1151                 mdt_set_capainfo(info, 0, &info->mti_body->fid1,
1152                                  req_capsule_client_get(info->mti_pill,
1153                                                         &RMF_CAPA1));
1154
1155         if (req_capsule_get_size(info->mti_pill, &RMF_CAPA2, RCL_CLIENT))
1156                 mdt_set_capainfo(info, 1, &info->mti_body->fid2,
1157                                  req_capsule_client_get(info->mti_pill,
1158                                                         &RMF_CAPA2));
1159
1160         o1 = info->mti_object;
1161         o = o2 = mdt_object_find(info->mti_env, info->mti_mdt,
1162                                 &info->mti_body->fid2);
1163         if (IS_ERR(o))
1164                 GOTO(out, rc = PTR_ERR(o));
1165
1166         if (mdt_object_remote(o) || !mdt_object_exists(o)) /* remote object */
1167                 GOTO(put, rc = -ENOENT);
1168
1169         rc = lu_fid_cmp(&info->mti_body->fid1, &info->mti_body->fid2);
1170         if (unlikely(rc == 0)) /* same file, you kidding me? no-op. */
1171                 GOTO(put, rc);
1172
1173         if (rc < 0)
1174                 swap(o1, o2);
1175
1176         /* permission check. Make sure the calling process having permission
1177          * to write both files. */
1178         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o1), NULL,
1179                                 MAY_WRITE);
1180         if (rc < 0)
1181                 GOTO(put, rc);
1182
1183         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o2), NULL,
1184                                 MAY_WRITE);
1185         if (rc < 0)
1186                 GOTO(put, rc);
1187
1188         msl = req_capsule_client_get(info->mti_pill, &RMF_SWAP_LAYOUTS);
1189         if (msl == NULL)
1190                 GOTO(put, rc = -EPROTO);
1191
1192         lh1 = &info->mti_lh[MDT_LH_NEW];
1193         mdt_lock_reg_init(lh1, LCK_EX);
1194         lh2 = &info->mti_lh[MDT_LH_OLD];
1195         mdt_lock_reg_init(lh2, LCK_EX);
1196
1197         rc = mdt_object_lock(info, o1, lh1, MDS_INODELOCK_LAYOUT |
1198                              MDS_INODELOCK_XATTR, MDT_LOCAL_LOCK);
1199         if (rc < 0)
1200                 GOTO(put, rc);
1201
1202         rc = mdt_object_lock(info, o2, lh2, MDS_INODELOCK_LAYOUT |
1203                              MDS_INODELOCK_XATTR, MDT_LOCAL_LOCK);
1204         if (rc < 0)
1205                 GOTO(unlock1, rc);
1206
1207         rc = mo_swap_layouts(info->mti_env, mdt_object_child(o1),
1208                              mdt_object_child(o2), msl->msl_flags);
1209         GOTO(unlock2, rc);
1210 unlock2:
1211         mdt_object_unlock(info, o2, lh2, rc);
1212 unlock1:
1213         mdt_object_unlock(info, o1, lh1, rc);
1214 put:
1215         mdt_object_put(info->mti_env, o);
1216 out:
1217         mdt_thread_info_fini(info);
1218         RETURN(rc);
1219 }
1220
1221 static int mdt_raw_lookup(struct mdt_thread_info *info,
1222                           struct mdt_object *parent,
1223                           const struct lu_name *lname,
1224                           struct ldlm_reply *ldlm_rep)
1225 {
1226         struct md_object *next = mdt_object_child(info->mti_object);
1227         const struct mdt_body *reqbody = info->mti_body;
1228         struct lu_fid *child_fid = &info->mti_tmp_fid1;
1229         struct mdt_body *repbody;
1230         int rc;
1231         ENTRY;
1232
1233         if (reqbody->valid != OBD_MD_FLID)
1234                 RETURN(0);
1235
1236         LASSERT(!info->mti_cross_ref);
1237
1238         /* Only got the fid of this obj by name */
1239         fid_zero(child_fid);
1240         rc = mdo_lookup(info->mti_env, next, lname, child_fid,
1241                         &info->mti_spec);
1242 #if 0
1243         /* XXX is raw_lookup possible as intent operation? */
1244         if (rc != 0) {
1245                 if (rc == -ENOENT)
1246                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1247                 RETURN(rc);
1248         } else
1249                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1250
1251         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1252 #endif
1253         if (rc == 0) {
1254                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1255                 repbody->fid1 = *child_fid;
1256                 repbody->valid = OBD_MD_FLID;
1257         }
1258         RETURN(1);
1259 }
1260
1261 /*
1262  * UPDATE lock should be taken against parent, and be release before exit;
1263  * child_bits lock should be taken against child, and be returned back:
1264  *            (1)normal request should release the child lock;
1265  *            (2)intent request will grant the lock to client.
1266  */
1267 static int mdt_getattr_name_lock(struct mdt_thread_info *info,
1268                                  struct mdt_lock_handle *lhc,
1269                                  __u64 child_bits,
1270                                  struct ldlm_reply *ldlm_rep)
1271 {
1272         struct ptlrpc_request  *req       = mdt_info_req(info);
1273         struct mdt_body        *reqbody   = NULL;
1274         struct mdt_object      *parent    = info->mti_object;
1275         struct mdt_object      *child;
1276         struct md_object       *next      = mdt_object_child(parent);
1277         struct lu_fid          *child_fid = &info->mti_tmp_fid1;
1278         struct lu_name         *lname     = NULL;
1279         struct mdt_lock_handle *lhp       = NULL;
1280         struct ldlm_lock       *lock;
1281         struct ldlm_res_id     *res_id;
1282         int                     is_resent;
1283         int                     ma_need = 0;
1284         int                     rc;
1285
1286         ENTRY;
1287
1288         is_resent = lustre_handle_is_used(&lhc->mlh_reg_lh);
1289         LASSERT(ergo(is_resent,
1290                      lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT));
1291
1292         LASSERT(parent != NULL);
1293
1294         lname = &info->mti_name;
1295         mdt_name_unpack(info->mti_pill, &RMF_NAME, lname, MNF_FIX_ANON);
1296
1297         if (!info->mti_cross_ref) {
1298                 /*
1299                  * XXX: Check for anonymous name is for getattr by fid
1300                  * (OBD_CONNECT_ATTRFID), otherwise do not allow empty name,
1301                  * that is the name must contain at least one character and
1302                  * the terminating '\0'.
1303                  */
1304                 if (!lu_name_is_valid(lname)) {
1305                         reqbody = req_capsule_client_get(info->mti_pill,
1306                                                          &RMF_MDT_BODY);
1307                         if (unlikely(reqbody == NULL))
1308                                 RETURN(err_serious(-EFAULT));
1309
1310                         if (unlikely(!fid_is_sane(&reqbody->fid2)))
1311                                 RETURN(err_serious(-EINVAL));
1312
1313                         CDEBUG(D_INODE, "getattr with lock for "DFID"/"DFID", "
1314                                "ldlm_rep = %p\n",
1315                                PFID(mdt_object_fid(parent)),
1316                                PFID(&reqbody->fid2), ldlm_rep);
1317                 } else {
1318                         CDEBUG(D_INODE, "getattr with lock for "DFID"/"DNAME", "
1319                                "ldlm_rep = %p\n", PFID(mdt_object_fid(parent)),
1320                                PNAME(lname), ldlm_rep);
1321                 }
1322         }
1323
1324         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_EXECD);
1325
1326         if (unlikely(!mdt_object_exists(parent)) && lu_name_is_valid(lname)) {
1327                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1328                                 &parent->mot_obj,
1329                                 "Parent doesn't exist!\n");
1330                 RETURN(-ESTALE);
1331         } else if (!info->mti_cross_ref) {
1332                 LASSERTF(!mdt_object_remote(parent),
1333                          "Parent "DFID" is on remote server\n",
1334                          PFID(mdt_object_fid(parent)));
1335         }
1336
1337         if (lu_name_is_valid(lname)) {
1338                 rc = mdt_raw_lookup(info, parent, lname, ldlm_rep);
1339                 if (rc != 0) {
1340                         if (rc > 0)
1341                                 rc = 0;
1342                         RETURN(rc);
1343                 }
1344         }
1345
1346         if (info->mti_cross_ref) {
1347                 /* Only getattr on the child. Parent is on another node. */
1348                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1349                 child = parent;
1350                 CDEBUG(D_INODE, "partial getattr_name child_fid = "DFID", "
1351                        "ldlm_rep=%p\n", PFID(mdt_object_fid(child)), ldlm_rep);
1352
1353                 if (is_resent) {
1354                         /* Do not take lock for resent case. */
1355                         lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1356                         LASSERTF(lock != NULL, "Invalid lock handle "LPX64"\n",
1357                                  lhc->mlh_reg_lh.cookie);
1358                         LASSERT(fid_res_name_eq(mdt_object_fid(child),
1359                                                 &lock->l_resource->lr_name));
1360                         LDLM_LOCK_PUT(lock);
1361                         rc = 0;
1362                 } else {
1363                         mdt_lock_handle_init(lhc);
1364                         mdt_lock_reg_init(lhc, LCK_PR);
1365
1366                         /*
1367                          * Object's name is on another MDS, no lookup or layout
1368                          * lock is needed here but update lock is.
1369                          */
1370                         child_bits &= ~(MDS_INODELOCK_LOOKUP |
1371                                         MDS_INODELOCK_LAYOUT);
1372                         child_bits |= MDS_INODELOCK_PERM | MDS_INODELOCK_UPDATE;
1373
1374                         rc = mdt_object_lock(info, child, lhc, child_bits,
1375                                              MDT_LOCAL_LOCK);
1376                 }
1377                 if (rc == 0) {
1378                         /* Finally, we can get attr for child. */
1379                         if (!mdt_object_exists(child)) {
1380                                 LU_OBJECT_DEBUG(D_INFO, info->mti_env,
1381                                                 &child->mot_obj,
1382                                              "remote object doesn't exist.\n");
1383                                 mdt_object_unlock(info, child, lhc, 1);
1384                                 RETURN(-ENOENT);
1385                         }
1386
1387                         mdt_set_capainfo(info, 0, mdt_object_fid(child),
1388                                          BYPASS_CAPA);
1389                         rc = mdt_getattr_internal(info, child, 0);
1390                         if (unlikely(rc != 0))
1391                                 mdt_object_unlock(info, child, lhc, 1);
1392                 }
1393                 RETURN(rc);
1394         }
1395
1396         if (lu_name_is_valid(lname)) {
1397                 /* step 1: lock parent only if parent is a directory */
1398                 if (S_ISDIR(lu_object_attr(&parent->mot_obj))) {
1399                         lhp = &info->mti_lh[MDT_LH_PARENT];
1400                         mdt_lock_pdo_init(lhp, LCK_PR, lname);
1401                         rc = mdt_object_lock(info, parent, lhp,
1402                                              MDS_INODELOCK_UPDATE,
1403                                              MDT_LOCAL_LOCK);
1404                         if (unlikely(rc != 0))
1405                                 RETURN(rc);
1406                 }
1407
1408                 /* step 2: lookup child's fid by name */
1409                 fid_zero(child_fid);
1410                 rc = mdo_lookup(info->mti_env, next, lname, child_fid,
1411                                 &info->mti_spec);
1412
1413                 if (rc != 0) {
1414                         if (rc == -ENOENT)
1415                                 mdt_set_disposition(info, ldlm_rep,
1416                                                     DISP_LOOKUP_NEG);
1417                         GOTO(out_parent, rc);
1418                 } else
1419                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1420         } else {
1421                 *child_fid = reqbody->fid2;
1422                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1423         }
1424
1425         /*
1426          *step 3: find the child object by fid & lock it.
1427          *        regardless if it is local or remote.
1428          *
1429          *Note: LU-3240 (commit 762f2114d282a98ebfa4dbbeea9298a8088ad24e)
1430          *      set parent dir fid the same as child fid in getattr by fid case
1431          *      we should not lu_object_find() the object again, could lead
1432          *      to hung if there is a concurrent unlink destroyed the object.
1433          */
1434         if (lu_fid_eq(mdt_object_fid(parent), child_fid)) {
1435                 mdt_object_get(info->mti_env, parent);
1436                 child = parent;
1437         } else {
1438                 child = mdt_object_find(info->mti_env, info->mti_mdt,
1439                                         child_fid);
1440         }
1441
1442         if (unlikely(IS_ERR(child)))
1443                 GOTO(out_parent, rc = PTR_ERR(child));
1444         if (is_resent) {
1445                 /* Do not take lock for resent case. */
1446                 lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1447                 LASSERTF(lock != NULL, "Invalid lock handle "LPX64"\n",
1448                          lhc->mlh_reg_lh.cookie);
1449
1450                 res_id = &lock->l_resource->lr_name;
1451                 if (!fid_res_name_eq(mdt_object_fid(child),
1452                                      &lock->l_resource->lr_name)) {
1453                         LASSERTF(fid_res_name_eq(mdt_object_fid(parent),
1454                                                  &lock->l_resource->lr_name),
1455                                  "Lock res_id: "DLDLMRES", fid: "DFID"\n",
1456                                  PLDLMRES(lock->l_resource),
1457                                  PFID(mdt_object_fid(parent)));
1458                         CWARN("Although resent, but still not get child lock"
1459                               "parent:"DFID" child:"DFID"\n",
1460                               PFID(mdt_object_fid(parent)),
1461                               PFID(mdt_object_fid(child)));
1462                         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
1463                         LDLM_LOCK_PUT(lock);
1464                         GOTO(relock, 0);
1465                 }
1466                 LDLM_LOCK_PUT(lock);
1467                 rc = 0;
1468         } else {
1469                 bool try_layout = false;
1470
1471 relock:
1472                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RESEND, obd_timeout*2);
1473                 mdt_lock_handle_init(lhc);
1474                 mdt_lock_reg_init(lhc, LCK_PR);
1475
1476                 if (!mdt_object_exists(child)) {
1477                         LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1478                                         &child->mot_obj,
1479                                         "Object doesn't exist!\n");
1480                         GOTO(out_child, rc = -ENOENT);
1481                 }
1482
1483                 if (!(child_bits & MDS_INODELOCK_UPDATE) &&
1484                       mdt_object_exists(child) && !mdt_object_remote(child)) {
1485                         struct md_attr *ma = &info->mti_attr;
1486
1487                         ma->ma_valid = 0;
1488                         ma->ma_need = MA_INODE;
1489                         rc = mdt_attr_get_complex(info, child, ma);
1490                         if (unlikely(rc != 0))
1491                                 GOTO(out_child, rc);
1492
1493                         /* If the file has not been changed for some time, we
1494                          * return not only a LOOKUP lock, but also an UPDATE
1495                          * lock and this might save us RPC on later STAT. For
1496                          * directories, it also let negative dentry cache start
1497                          * working for this dir. */
1498                         if (ma->ma_valid & MA_INODE &&
1499                             ma->ma_attr.la_valid & LA_CTIME &&
1500                             info->mti_mdt->mdt_namespace->ns_ctime_age_limit +
1501                                 ma->ma_attr.la_ctime < cfs_time_current_sec())
1502                                 child_bits |= MDS_INODELOCK_UPDATE;
1503                 }
1504
1505                 /* layout lock must be granted in a best-effort way
1506                  * for IT operations */
1507                 LASSERT(!(child_bits & MDS_INODELOCK_LAYOUT));
1508                 if (!OBD_FAIL_CHECK(OBD_FAIL_MDS_NO_LL_GETATTR) &&
1509                     exp_connect_layout(info->mti_exp) &&
1510                     S_ISREG(lu_object_attr(&child->mot_obj)) &&
1511                     !mdt_object_remote(child) && ldlm_rep != NULL) {
1512                         /* try to grant layout lock for regular file. */
1513                         try_layout = true;
1514                 }
1515
1516                 rc = 0;
1517                 if (try_layout) {
1518                         child_bits |= MDS_INODELOCK_LAYOUT;
1519                         /* try layout lock, it may fail to be granted due to
1520                          * contention at LOOKUP or UPDATE */
1521                         if (!mdt_object_lock_try(info, child, lhc, child_bits,
1522                                                  MDT_CROSS_LOCK)) {
1523                                 child_bits &= ~MDS_INODELOCK_LAYOUT;
1524                                 LASSERT(child_bits != 0);
1525                                 rc = mdt_object_lock(info, child, lhc,
1526                                                 child_bits, MDT_CROSS_LOCK);
1527                         } else {
1528                                 ma_need |= MA_LOV;
1529                         }
1530                 } else {
1531                         /* Do not enqueue the UPDATE lock from MDT(cross-MDT),
1532                          * client will enqueue the lock to the remote MDT */
1533                         if (mdt_object_remote(child))
1534                                 child_bits &= ~MDS_INODELOCK_UPDATE;
1535                         rc = mdt_object_lock(info, child, lhc, child_bits,
1536                                                 MDT_CROSS_LOCK);
1537                 }
1538                 if (unlikely(rc != 0))
1539                         GOTO(out_child, rc);
1540         }
1541
1542         lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1543         /* Get MA_SOM attributes if update lock is given. */
1544         if (lock &&
1545             lock->l_policy_data.l_inodebits.bits & MDS_INODELOCK_UPDATE &&
1546             S_ISREG(lu_object_attr(&mdt_object_child(child)->mo_lu)))
1547                 ma_need |= MA_SOM;
1548
1549         /* finally, we can get attr for child. */
1550         mdt_set_capainfo(info, 1, child_fid, BYPASS_CAPA);
1551         rc = mdt_getattr_internal(info, child, ma_need);
1552         if (unlikely(rc != 0)) {
1553                 mdt_object_unlock(info, child, lhc, 1);
1554         } else if (lock) {
1555                 /* Debugging code. */
1556                 res_id = &lock->l_resource->lr_name;
1557                 LDLM_DEBUG(lock, "Returning lock to client");
1558                 LASSERTF(fid_res_name_eq(mdt_object_fid(child),
1559                                          &lock->l_resource->lr_name),
1560                          "Lock res_id: "DLDLMRES", fid: "DFID"\n",
1561                          PLDLMRES(lock->l_resource),
1562                          PFID(mdt_object_fid(child)));
1563                 if (mdt_object_exists(child) && !mdt_object_remote(child))
1564                         mdt_pack_size2body(info, child);
1565         }
1566         if (lock)
1567                 LDLM_LOCK_PUT(lock);
1568
1569         EXIT;
1570 out_child:
1571         mdt_object_put(info->mti_env, child);
1572 out_parent:
1573         if (lhp)
1574                 mdt_object_unlock(info, parent, lhp, 1);
1575         return rc;
1576 }
1577
1578 /* normal handler: should release the child lock */
1579 int mdt_getattr_name(struct tgt_session_info *tsi)
1580 {
1581         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1582         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_CHILD];
1583         struct mdt_body        *reqbody;
1584         struct mdt_body        *repbody;
1585         int rc, rc2;
1586         ENTRY;
1587
1588         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1589         LASSERT(reqbody != NULL);
1590         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1591         LASSERT(repbody != NULL);
1592
1593         info->mti_cross_ref = !!(reqbody->valid & OBD_MD_FLCROSSREF);
1594         repbody->eadatasize = 0;
1595         repbody->aclsize = 0;
1596
1597         rc = mdt_init_ucred(info, reqbody);
1598         if (unlikely(rc))
1599                 GOTO(out_shrink, rc);
1600
1601         rc = mdt_getattr_name_lock(info, lhc, MDS_INODELOCK_UPDATE, NULL);
1602         if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
1603                 ldlm_lock_decref(&lhc->mlh_reg_lh, lhc->mlh_reg_mode);
1604                 lhc->mlh_reg_lh.cookie = 0;
1605         }
1606         mdt_exit_ucred(info);
1607         EXIT;
1608 out_shrink:
1609         mdt_client_compatibility(info);
1610         rc2 = mdt_fix_reply(info);
1611         if (rc == 0)
1612                 rc = rc2;
1613         mdt_thread_info_fini(info);
1614         return rc;
1615 }
1616
1617 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1618                          void *karg, void *uarg);
1619
1620 int mdt_set_info(struct tgt_session_info *tsi)
1621 {
1622         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1623         char                    *key;
1624         void                    *val;
1625         int                      keylen, vallen, rc = 0;
1626
1627         ENTRY;
1628
1629         key = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_KEY);
1630         if (key == NULL) {
1631                 DEBUG_REQ(D_HA, req, "no set_info key");
1632                 RETURN(err_serious(-EFAULT));
1633         }
1634
1635         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_KEY,
1636                                       RCL_CLIENT);
1637
1638         val = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_VAL);
1639         if (val == NULL) {
1640                 DEBUG_REQ(D_HA, req, "no set_info val");
1641                 RETURN(err_serious(-EFAULT));
1642         }
1643
1644         vallen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_VAL,
1645                                       RCL_CLIENT);
1646
1647         /* Swab any part of val you need to here */
1648         if (KEY_IS(KEY_READ_ONLY)) {
1649                 spin_lock(&req->rq_export->exp_lock);
1650                 if (*(__u32 *)val)
1651                         *exp_connect_flags_ptr(req->rq_export) |=
1652                                 OBD_CONNECT_RDONLY;
1653                 else
1654                         *exp_connect_flags_ptr(req->rq_export) &=
1655                                 ~OBD_CONNECT_RDONLY;
1656                 spin_unlock(&req->rq_export->exp_lock);
1657         } else if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
1658                 struct changelog_setinfo *cs = val;
1659
1660                 if (vallen != sizeof(*cs)) {
1661                         CERROR("%s: bad changelog_clear setinfo size %d\n",
1662                                tgt_name(tsi->tsi_tgt), vallen);
1663                         RETURN(-EINVAL);
1664                 }
1665                 if (ptlrpc_req_need_swab(req)) {
1666                         __swab64s(&cs->cs_recno);
1667                         __swab32s(&cs->cs_id);
1668                 }
1669
1670                 rc = mdt_iocontrol(OBD_IOC_CHANGELOG_CLEAR, req->rq_export,
1671                                    vallen, val, NULL);
1672         } else {
1673                 RETURN(-EINVAL);
1674         }
1675         RETURN(rc);
1676 }
1677
1678 int mdt_readpage(struct tgt_session_info *tsi)
1679 {
1680         struct mdt_thread_info  *info = mdt_th_info(tsi->tsi_env);
1681         struct mdt_object       *object = mdt_obj(tsi->tsi_corpus);
1682         struct lu_rdpg          *rdpg = &info->mti_u.rdpg.mti_rdpg;
1683         const struct mdt_body   *reqbody = tsi->tsi_mdt_body;
1684         struct mdt_body         *repbody;
1685         int                      rc;
1686         int                      i;
1687
1688         ENTRY;
1689
1690         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK))
1691                 RETURN(err_serious(-ENOMEM));
1692
1693         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_MDT_BODY);
1694         if (repbody == NULL || reqbody == NULL)
1695                 RETURN(err_serious(-EFAULT));
1696
1697         /*
1698          * prepare @rdpg before calling lower layers and transfer itself. Here
1699          * reqbody->size contains offset of where to start to read and
1700          * reqbody->nlink contains number bytes to read.
1701          */
1702         rdpg->rp_hash = reqbody->size;
1703         if (rdpg->rp_hash != reqbody->size) {
1704                 CERROR("Invalid hash: "LPX64" != "LPX64"\n",
1705                        rdpg->rp_hash, reqbody->size);
1706                 RETURN(-EFAULT);
1707         }
1708
1709         rdpg->rp_attrs = reqbody->mode;
1710         if (exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_64BITHASH)
1711                 rdpg->rp_attrs |= LUDA_64BITHASH;
1712         rdpg->rp_count  = min_t(unsigned int, reqbody->nlink,
1713                                 exp_max_brw_size(tsi->tsi_exp));
1714         rdpg->rp_npages = (rdpg->rp_count + PAGE_CACHE_SIZE - 1) >>
1715                           PAGE_CACHE_SHIFT;
1716         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1717         if (rdpg->rp_pages == NULL)
1718                 RETURN(-ENOMEM);
1719
1720         for (i = 0; i < rdpg->rp_npages; ++i) {
1721                 rdpg->rp_pages[i] = alloc_page(GFP_IOFS);
1722                 if (rdpg->rp_pages[i] == NULL)
1723                         GOTO(free_rdpg, rc = -ENOMEM);
1724         }
1725
1726         /* call lower layers to fill allocated pages with directory data */
1727         rc = mo_readpage(tsi->tsi_env, mdt_object_child(object), rdpg);
1728         if (rc < 0)
1729                 GOTO(free_rdpg, rc);
1730
1731         /* send pages to client */
1732         rc = tgt_sendpage(tsi, rdpg, rc);
1733
1734         EXIT;
1735 free_rdpg:
1736
1737         for (i = 0; i < rdpg->rp_npages; i++)
1738                 if (rdpg->rp_pages[i] != NULL)
1739                         __free_page(rdpg->rp_pages[i]);
1740         OBD_FREE(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1741
1742         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
1743                 RETURN(0);
1744
1745         return rc;
1746 }
1747
1748 static int mdt_reint_internal(struct mdt_thread_info *info,
1749                               struct mdt_lock_handle *lhc,
1750                               __u32 op)
1751 {
1752         struct req_capsule      *pill = info->mti_pill;
1753         struct mdt_body         *repbody;
1754         int                      rc = 0, rc2;
1755
1756         ENTRY;
1757
1758         rc = mdt_reint_unpack(info, op);
1759         if (rc != 0) {
1760                 CERROR("Can't unpack reint, rc %d\n", rc);
1761                 RETURN(err_serious(rc));
1762         }
1763
1764         /* for replay (no_create) lmm is not needed, client has it already */
1765         if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1766                 req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
1767                                      info->mti_rr.rr_eadatalen);
1768
1769         /* llog cookies are always 0, the field is kept for compatibility */
1770         if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
1771                 req_capsule_set_size(pill, &RMF_LOGCOOKIES, RCL_SERVER, 0);
1772
1773         rc = req_capsule_server_pack(pill);
1774         if (rc != 0) {
1775                 CERROR("Can't pack response, rc %d\n", rc);
1776                 RETURN(err_serious(rc));
1777         }
1778
1779         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_SERVER)) {
1780                 repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1781                 LASSERT(repbody);
1782                 repbody->eadatasize = 0;
1783                 repbody->aclsize = 0;
1784         }
1785
1786         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_REINT_DELAY, 10);
1787
1788         /* for replay no cookkie / lmm need, because client have this already */
1789         if (info->mti_spec.no_create)
1790                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1791                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, 0);
1792
1793         rc = mdt_init_ucred_reint(info);
1794         if (rc)
1795                 GOTO(out_shrink, rc);
1796
1797         rc = mdt_fix_attr_ucred(info, op);
1798         if (rc != 0)
1799                 GOTO(out_ucred, rc = err_serious(rc));
1800
1801         if (mdt_check_resent(info, mdt_reconstruct, lhc)) {
1802                 DEBUG_REQ(D_INODE, mdt_info_req(info), "resent opt.");
1803                 rc = lustre_msg_get_status(mdt_info_req(info)->rq_repmsg);
1804                 GOTO(out_ucred, rc);
1805         }
1806         rc = mdt_reint_rec(info, lhc);
1807         EXIT;
1808 out_ucred:
1809         mdt_exit_ucred(info);
1810 out_shrink:
1811         mdt_client_compatibility(info);
1812         rc2 = mdt_fix_reply(info);
1813         if (rc == 0)
1814                 rc = rc2;
1815         return rc;
1816 }
1817
1818 static long mdt_reint_opcode(struct ptlrpc_request *req,
1819                              const struct req_format **fmt)
1820 {
1821         struct mdt_device       *mdt;
1822         struct mdt_rec_reint    *rec;
1823         long                     opc;
1824
1825         rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
1826         if (rec != NULL) {
1827                 opc = rec->rr_opcode;
1828                 DEBUG_REQ(D_INODE, req, "reint opt = %ld", opc);
1829                 if (opc < REINT_MAX && fmt[opc] != NULL)
1830                         req_capsule_extend(&req->rq_pill, fmt[opc]);
1831                 else {
1832                         mdt = mdt_exp2dev(req->rq_export);
1833                         CERROR("%s: Unsupported opcode '%ld' from client '%s':"
1834                                " rc = %d\n", req->rq_export->exp_obd->obd_name,
1835                                opc, mdt->mdt_ldlm_client->cli_name, -EFAULT);
1836                         opc = err_serious(-EFAULT);
1837                 }
1838         } else {
1839                 opc = err_serious(-EFAULT);
1840         }
1841         return opc;
1842 }
1843
1844 int mdt_reint(struct tgt_session_info *tsi)
1845 {
1846         long opc;
1847         int  rc;
1848         static const struct req_format *reint_fmts[REINT_MAX] = {
1849                 [REINT_SETATTR]  = &RQF_MDS_REINT_SETATTR,
1850                 [REINT_CREATE]   = &RQF_MDS_REINT_CREATE,
1851                 [REINT_LINK]     = &RQF_MDS_REINT_LINK,
1852                 [REINT_UNLINK]   = &RQF_MDS_REINT_UNLINK,
1853                 [REINT_RENAME]   = &RQF_MDS_REINT_RENAME,
1854                 [REINT_OPEN]     = &RQF_MDS_REINT_OPEN,
1855                 [REINT_SETXATTR] = &RQF_MDS_REINT_SETXATTR,
1856                 [REINT_RMENTRY]  = &RQF_MDS_REINT_UNLINK,
1857                 [REINT_MIGRATE]  = &RQF_MDS_REINT_RENAME
1858         };
1859
1860         ENTRY;
1861
1862         opc = mdt_reint_opcode(tgt_ses_req(tsi), reint_fmts);
1863         if (opc >= 0) {
1864                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
1865                 /*
1866                  * No lock possible here from client to pass it to reint code
1867                  * path.
1868                  */
1869                 rc = mdt_reint_internal(info, NULL, opc);
1870                 mdt_thread_info_fini(info);
1871         } else {
1872                 rc = opc;
1873         }
1874
1875         tsi->tsi_reply_fail_id = OBD_FAIL_MDS_REINT_NET_REP;
1876         RETURN(rc);
1877 }
1878
1879 /* this should sync the whole device */
1880 static int mdt_device_sync(const struct lu_env *env, struct mdt_device *mdt)
1881 {
1882         struct dt_device *dt = mdt->mdt_bottom;
1883         int rc;
1884         ENTRY;
1885
1886         rc = dt->dd_ops->dt_sync(env, dt);
1887         RETURN(rc);
1888 }
1889
1890 /* this should sync this object */
1891 static int mdt_object_sync(struct mdt_thread_info *info)
1892 {
1893         struct md_object *next;
1894         int rc;
1895         ENTRY;
1896
1897         if (!mdt_object_exists(info->mti_object)) {
1898                 CWARN("Non existing object  "DFID"!\n",
1899                       PFID(mdt_object_fid(info->mti_object)));
1900                 RETURN(-ESTALE);
1901         }
1902         next = mdt_object_child(info->mti_object);
1903         rc = mo_object_sync(info->mti_env, next);
1904
1905         RETURN(rc);
1906 }
1907
1908 int mdt_sync(struct tgt_session_info *tsi)
1909 {
1910         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1911         struct req_capsule      *pill = tsi->tsi_pill;
1912         struct mdt_body         *body;
1913         int                      rc;
1914
1915         ENTRY;
1916
1917         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SYNC_PACK))
1918                 RETURN(err_serious(-ENOMEM));
1919
1920         if (fid_seq(&tsi->tsi_mdt_body->fid1) == 0) {
1921                 rc = mdt_device_sync(tsi->tsi_env, mdt_exp2dev(tsi->tsi_exp));
1922         } else {
1923                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
1924
1925                 /* sync an object */
1926                 rc = mdt_object_sync(info);
1927                 if (rc == 0) {
1928                         const struct lu_fid *fid;
1929                         struct lu_attr *la = &info->mti_attr.ma_attr;
1930
1931                         info->mti_attr.ma_need = MA_INODE;
1932                         info->mti_attr.ma_valid = 0;
1933                         rc = mdt_attr_get_complex(info, info->mti_object,
1934                                                   &info->mti_attr);
1935                         if (rc == 0) {
1936                                 body = req_capsule_server_get(pill,
1937                                                               &RMF_MDT_BODY);
1938                                 fid = mdt_object_fid(info->mti_object);
1939                                 mdt_pack_attr2body(info, body, la, fid);
1940                         }
1941                 }
1942                 mdt_thread_info_fini(info);
1943         }
1944         if (rc == 0)
1945                 mdt_counter_incr(req, LPROC_MDT_SYNC);
1946
1947         RETURN(rc);
1948 }
1949
1950 /*
1951  * Handle quota control requests to consult current usage/limit, but also
1952  * to configure quota enforcement
1953  */
1954 int mdt_quotactl(struct tgt_session_info *tsi)
1955 {
1956         struct obd_export       *exp  = tsi->tsi_exp;
1957         struct req_capsule      *pill = tsi->tsi_pill;
1958         struct obd_quotactl     *oqctl, *repoqc;
1959         int                      id, rc;
1960         struct mdt_device       *mdt = mdt_exp2dev(exp);
1961         struct lu_device        *qmt = mdt->mdt_qmt_dev;
1962         ENTRY;
1963
1964         oqctl = req_capsule_client_get(pill, &RMF_OBD_QUOTACTL);
1965         if (oqctl == NULL)
1966                 RETURN(err_serious(-EPROTO));
1967
1968         rc = req_capsule_server_pack(pill);
1969         if (rc)
1970                 RETURN(err_serious(rc));
1971
1972         switch (oqctl->qc_cmd) {
1973         case Q_QUOTACHECK:
1974         case LUSTRE_Q_INVALIDATE:
1975         case LUSTRE_Q_FINVALIDATE:
1976         case Q_QUOTAON:
1977         case Q_QUOTAOFF:
1978         case Q_INITQUOTA:
1979                 /* deprecated, not used any more */
1980                 RETURN(-EOPNOTSUPP);
1981                 /* master quotactl */
1982         case Q_GETINFO:
1983         case Q_SETINFO:
1984         case Q_SETQUOTA:
1985         case Q_GETQUOTA:
1986                 if (qmt == NULL)
1987                         RETURN(-EOPNOTSUPP);
1988                 /* slave quotactl */
1989         case Q_GETOINFO:
1990         case Q_GETOQUOTA:
1991                 break;
1992         default:
1993                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
1994                 RETURN(-EFAULT);
1995         }
1996
1997         /* map uid/gid for remote client */
1998         id = oqctl->qc_id;
1999         if (exp_connect_rmtclient(exp)) {
2000                 struct lustre_idmap_table *idmap;
2001
2002                 idmap = exp->exp_mdt_data.med_idmap;
2003
2004                 if (unlikely(oqctl->qc_cmd != Q_GETQUOTA &&
2005                              oqctl->qc_cmd != Q_GETINFO))
2006                         RETURN(-EPERM);
2007
2008                 if (oqctl->qc_type == USRQUOTA)
2009                         id = lustre_idmap_lookup_uid(NULL, idmap, 0,
2010                                                      oqctl->qc_id);
2011                 else if (oqctl->qc_type == GRPQUOTA)
2012                         id = lustre_idmap_lookup_gid(NULL, idmap, 0,
2013                                                      oqctl->qc_id);
2014                 else
2015                         RETURN(-EINVAL);
2016
2017                 if (id == CFS_IDMAP_NOTFOUND) {
2018                         CDEBUG(D_QUOTA, "no mapping for id %u\n", oqctl->qc_id);
2019                         RETURN(-EACCES);
2020                 }
2021         }
2022
2023         repoqc = req_capsule_server_get(pill, &RMF_OBD_QUOTACTL);
2024         if (repoqc == NULL)
2025                 RETURN(err_serious(-EFAULT));
2026
2027         if (oqctl->qc_id != id)
2028                 swap(oqctl->qc_id, id);
2029
2030         switch (oqctl->qc_cmd) {
2031
2032         case Q_GETINFO:
2033         case Q_SETINFO:
2034         case Q_SETQUOTA:
2035         case Q_GETQUOTA:
2036                 /* forward quotactl request to QMT */
2037                 rc = qmt_hdls.qmth_quotactl(tsi->tsi_env, qmt, oqctl);
2038                 break;
2039
2040         case Q_GETOINFO:
2041         case Q_GETOQUOTA:
2042                 /* slave quotactl */
2043                 rc = lquotactl_slv(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
2044                                    oqctl);
2045                 break;
2046
2047         default:
2048                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2049                 RETURN(-EFAULT);
2050         }
2051
2052         if (oqctl->qc_id != id)
2053                 swap(oqctl->qc_id, id);
2054
2055         *repoqc = *oqctl;
2056         RETURN(rc);
2057 }
2058
2059 /** clone llog ctxt from child (mdd)
2060  * This allows remote llog (replicator) access.
2061  * We can either pass all llog RPCs (eg mdt_llog_create) on to child where the
2062  * context was originally set up, or we can handle them directly.
2063  * I choose the latter, but that means I need any llog
2064  * contexts set up by child to be accessable by the mdt.  So we clone the
2065  * context into our context list here.
2066  */
2067 static int mdt_llog_ctxt_clone(const struct lu_env *env, struct mdt_device *mdt,
2068                                int idx)
2069 {
2070         struct md_device  *next = mdt->mdt_child;
2071         struct llog_ctxt *ctxt;
2072         int rc;
2073
2074         if (!llog_ctxt_null(mdt2obd_dev(mdt), idx))
2075                 return 0;
2076
2077         rc = next->md_ops->mdo_llog_ctxt_get(env, next, idx, (void **)&ctxt);
2078         if (rc || ctxt == NULL) {
2079                 return 0;
2080         }
2081
2082         rc = llog_group_set_ctxt(&mdt2obd_dev(mdt)->obd_olg, ctxt, idx);
2083         if (rc)
2084                 CERROR("Can't set mdt ctxt %d\n", rc);
2085
2086         return rc;
2087 }
2088
2089 static int mdt_llog_ctxt_unclone(const struct lu_env *env,
2090                                  struct mdt_device *mdt, int idx)
2091 {
2092         struct llog_ctxt *ctxt;
2093
2094         ctxt = llog_get_context(mdt2obd_dev(mdt), idx);
2095         if (ctxt == NULL)
2096                 return 0;
2097         /* Put once for the get we just did, and once for the clone */
2098         llog_ctxt_put(ctxt);
2099         llog_ctxt_put(ctxt);
2100         return 0;
2101 }
2102
2103 /*
2104  * sec context handlers
2105  */
2106 int mdt_sec_ctx_handle(struct tgt_session_info *tsi)
2107 {
2108         int rc;
2109
2110         rc = mdt_handle_idmap(tsi);
2111         if (unlikely(rc)) {
2112                 struct ptlrpc_request   *req = tgt_ses_req(tsi);
2113                 __u32                    opc;
2114
2115                 opc = lustre_msg_get_opc(req->rq_reqmsg);
2116                 if (opc == SEC_CTX_INIT || opc == SEC_CTX_INIT_CONT)
2117                         sptlrpc_svc_ctx_invalidate(req);
2118         }
2119
2120         CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
2121
2122         return rc;
2123 }
2124
2125 /*
2126  * quota request handlers
2127  */
2128 int mdt_quota_dqacq(struct tgt_session_info *tsi)
2129 {
2130         struct mdt_device       *mdt = mdt_exp2dev(tsi->tsi_exp);
2131         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2132         int                      rc;
2133         ENTRY;
2134
2135         if (qmt == NULL)
2136                 RETURN(err_serious(-EOPNOTSUPP));
2137
2138         rc = qmt_hdls.qmth_dqacq(tsi->tsi_env, qmt, tgt_ses_req(tsi));
2139         RETURN(rc);
2140 }
2141
2142 struct mdt_object *mdt_object_new(const struct lu_env *env,
2143                                   struct mdt_device *d,
2144                                   const struct lu_fid *f)
2145 {
2146         struct lu_object_conf conf = { .loc_flags = LOC_F_NEW };
2147         struct lu_object *o;
2148         struct mdt_object *m;
2149         ENTRY;
2150
2151         CDEBUG(D_INFO, "Allocate object for "DFID"\n", PFID(f));
2152         o = lu_object_find(env, &d->mdt_lu_dev, f, &conf);
2153         if (unlikely(IS_ERR(o)))
2154                 m = (struct mdt_object *)o;
2155         else
2156                 m = mdt_obj(o);
2157         RETURN(m);
2158 }
2159
2160 struct mdt_object *mdt_object_find(const struct lu_env *env,
2161                                    struct mdt_device *d,
2162                                    const struct lu_fid *f)
2163 {
2164         struct lu_object *o;
2165         struct mdt_object *m;
2166         ENTRY;
2167
2168         CDEBUG(D_INFO, "Find object for "DFID"\n", PFID(f));
2169         o = lu_object_find(env, &d->mdt_lu_dev, f, NULL);
2170         if (unlikely(IS_ERR(o)))
2171                 m = (struct mdt_object *)o;
2172         else
2173                 m = mdt_obj(o);
2174
2175         RETURN(m);
2176 }
2177
2178 /**
2179  * Asyncronous commit for mdt device.
2180  *
2181  * Pass asynchonous commit call down the MDS stack.
2182  *
2183  * \param env environment
2184  * \param mdt the mdt device
2185  */
2186 static void mdt_device_commit_async(const struct lu_env *env,
2187                                     struct mdt_device *mdt)
2188 {
2189         struct dt_device *dt = mdt->mdt_bottom;
2190         int rc;
2191
2192         rc = dt->dd_ops->dt_commit_async(env, dt);
2193         if (unlikely(rc != 0))
2194                 CWARN("async commit start failed with rc = %d", rc);
2195 }
2196
2197 /**
2198  * Mark the lock as "synchonous".
2199  *
2200  * Mark the lock to deffer transaction commit to the unlock time.
2201  *
2202  * \param lock the lock to mark as "synchonous"
2203  *
2204  * \see mdt_is_lock_sync
2205  * \see mdt_save_lock
2206  */
2207 static inline void mdt_set_lock_sync(struct ldlm_lock *lock)
2208 {
2209         lock->l_ast_data = (void*)1;
2210 }
2211
2212 /**
2213  * Check whehter the lock "synchonous" or not.
2214  *
2215  * \param lock the lock to check
2216  * \retval 1 the lock is "synchonous"
2217  * \retval 0 the lock isn't "synchronous"
2218  *
2219  * \see mdt_set_lock_sync
2220  * \see mdt_save_lock
2221  */
2222 static inline int mdt_is_lock_sync(struct ldlm_lock *lock)
2223 {
2224         return lock->l_ast_data != NULL;
2225 }
2226
2227 /**
2228  * Blocking AST for mdt locks.
2229  *
2230  * Starts transaction commit if in case of COS lock conflict or
2231  * deffers such a commit to the mdt_save_lock.
2232  *
2233  * \param lock the lock which blocks a request or cancelling lock
2234  * \param desc unused
2235  * \param data unused
2236  * \param flag indicates whether this cancelling or blocking callback
2237  * \retval 0
2238  * \see ldlm_blocking_ast_nocheck
2239  */
2240 int mdt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2241                      void *data, int flag)
2242 {
2243         struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
2244         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
2245         int rc;
2246         ENTRY;
2247
2248         if (flag == LDLM_CB_CANCELING)
2249                 RETURN(0);
2250         lock_res_and_lock(lock);
2251         if (lock->l_blocking_ast != mdt_blocking_ast) {
2252                 unlock_res_and_lock(lock);
2253                 RETURN(0);
2254         }
2255         if (mdt_cos_is_enabled(mdt) &&
2256             lock->l_req_mode & (LCK_PW | LCK_EX) &&
2257             lock->l_blocking_lock != NULL &&
2258             lock->l_client_cookie != lock->l_blocking_lock->l_client_cookie) {
2259                 mdt_set_lock_sync(lock);
2260         }
2261         rc = ldlm_blocking_ast_nocheck(lock);
2262
2263         /* There is no lock conflict if l_blocking_lock == NULL,
2264          * it indicates a blocking ast sent from ldlm_lock_decref_internal
2265          * when the last reference to a local lock was released */
2266         if (lock->l_req_mode == LCK_COS && lock->l_blocking_lock != NULL) {
2267                 struct lu_env env;
2268
2269                 rc = lu_env_init(&env, LCT_LOCAL);
2270                 if (unlikely(rc != 0))
2271                         CWARN("lu_env initialization failed with rc = %d,"
2272                               "cannot start asynchronous commit\n", rc);
2273                 else
2274                         mdt_device_commit_async(&env, mdt);
2275                 lu_env_fini(&env);
2276         }
2277         RETURN(rc);
2278 }
2279
2280 /* Used for cross-MDT lock */
2281 int mdt_remote_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2282                             void *data, int flag)
2283 {
2284         struct lustre_handle lockh;
2285         int               rc;
2286
2287         switch (flag) {
2288         case LDLM_CB_BLOCKING:
2289                 ldlm_lock2handle(lock, &lockh);
2290                 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
2291                 if (rc < 0) {
2292                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
2293                         RETURN(rc);
2294                 }
2295                 break;
2296         case LDLM_CB_CANCELING:
2297                 LDLM_DEBUG(lock, "Revoke remote lock\n");
2298                 break;
2299         default:
2300                 LBUG();
2301         }
2302         RETURN(0);
2303 }
2304
2305 int mdt_remote_object_lock(struct mdt_thread_info *mti,
2306                            struct mdt_object *o, const struct lu_fid *fid,
2307                            struct lustre_handle *lh, ldlm_mode_t mode,
2308                            __u64 ibits)
2309 {
2310         struct ldlm_enqueue_info *einfo = &mti->mti_einfo;
2311         ldlm_policy_data_t *policy = &mti->mti_policy;
2312         struct ldlm_res_id *res_id = &mti->mti_res_id;
2313         int rc = 0;
2314         ENTRY;
2315
2316         LASSERT(mdt_object_remote(o));
2317
2318         LASSERT(ibits == MDS_INODELOCK_UPDATE);
2319
2320         fid_build_reg_res_name(fid, res_id);
2321
2322         memset(einfo, 0, sizeof(*einfo));
2323         einfo->ei_type = LDLM_IBITS;
2324         einfo->ei_mode = mode;
2325         einfo->ei_cb_bl = mdt_remote_blocking_ast;
2326         einfo->ei_cb_cp = ldlm_completion_ast;
2327         einfo->ei_enq_slave = 0;
2328         einfo->ei_res_id = res_id;
2329
2330         memset(policy, 0, sizeof(*policy));
2331         policy->l_inodebits.bits = ibits;
2332
2333         rc = mo_object_lock(mti->mti_env, mdt_object_child(o), lh, einfo,
2334                             policy);
2335         RETURN(rc);
2336 }
2337
2338 static int mdt_object_local_lock(struct mdt_thread_info *info,
2339                                  struct mdt_object *o,
2340                                  struct mdt_lock_handle *lh, __u64 ibits,
2341                                  bool nonblock, int locality)
2342 {
2343         struct ldlm_namespace *ns = info->mti_mdt->mdt_namespace;
2344         ldlm_policy_data_t *policy = &info->mti_policy;
2345         struct ldlm_res_id *res_id = &info->mti_res_id;
2346         __u64 dlmflags;
2347         int rc;
2348         ENTRY;
2349
2350         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2351         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2352         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
2353         LASSERT(lh->mlh_type != MDT_NUL_LOCK);
2354
2355         /* Only enqueue LOOKUP lock for remote object */
2356         if (mdt_object_remote(o))
2357                 LASSERT(ibits == MDS_INODELOCK_LOOKUP);
2358
2359         if (lh->mlh_type == MDT_PDO_LOCK) {
2360                 /* check for exists after object is locked */
2361                 if (mdt_object_exists(o) == 0) {
2362                         /* Non-existent object shouldn't have PDO lock */
2363                         RETURN(-ESTALE);
2364                 } else {
2365                         /* Non-dir object shouldn't have PDO lock */
2366                         if (!S_ISDIR(lu_object_attr(&o->mot_obj)))
2367                                 RETURN(-ENOTDIR);
2368                 }
2369         }
2370
2371         memset(policy, 0, sizeof(*policy));
2372         fid_build_reg_res_name(mdt_object_fid(o), res_id);
2373
2374         dlmflags = LDLM_FL_ATOMIC_CB;
2375         if (nonblock)
2376                 dlmflags |= LDLM_FL_BLOCK_NOWAIT;
2377
2378         /*
2379          * Take PDO lock on whole directory and build correct @res_id for lock
2380          * on part of directory.
2381          */
2382         if (lh->mlh_pdo_hash != 0) {
2383                 LASSERT(lh->mlh_type == MDT_PDO_LOCK);
2384                 mdt_lock_pdo_mode(info, o, lh);
2385                 if (lh->mlh_pdo_mode != LCK_NL) {
2386                         /*
2387                          * Do not use LDLM_FL_LOCAL_ONLY for parallel lock, it
2388                          * is never going to be sent to client and we do not
2389                          * want it slowed down due to possible cancels.
2390                          */
2391                         policy->l_inodebits.bits = MDS_INODELOCK_UPDATE;
2392                         rc = mdt_fid_lock(ns, &lh->mlh_pdo_lh, lh->mlh_pdo_mode,
2393                                           policy, res_id, dlmflags,
2394                                           &info->mti_exp->exp_handle.h_cookie);
2395                         if (unlikely(rc))
2396                                 RETURN(rc);
2397                 }
2398
2399                 /*
2400                  * Finish res_id initializing by name hash marking part of
2401                  * directory which is taking modification.
2402                  */
2403                 res_id->name[LUSTRE_RES_ID_HSH_OFF] = lh->mlh_pdo_hash;
2404         }
2405
2406         policy->l_inodebits.bits = ibits;
2407
2408         /*
2409          * Use LDLM_FL_LOCAL_ONLY for this lock. We do not know yet if it is
2410          * going to be sent to client. If it is - mdt_intent_policy() path will
2411          * fix it up and turn FL_LOCAL flag off.
2412          */
2413         rc = mdt_fid_lock(ns, &lh->mlh_reg_lh, lh->mlh_reg_mode, policy,
2414                           res_id, LDLM_FL_LOCAL_ONLY | dlmflags,
2415                           &info->mti_exp->exp_handle.h_cookie);
2416         if (rc)
2417                 mdt_object_unlock(info, o, lh, 1);
2418         else if (unlikely(OBD_FAIL_PRECHECK(OBD_FAIL_MDS_PDO_LOCK)) &&
2419                  lh->mlh_pdo_hash != 0 &&
2420                  (lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX)) {
2421                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_PDO_LOCK, 15);
2422         }
2423
2424         RETURN(rc);
2425 }
2426
2427 int mdt_object_lock_internal(struct mdt_thread_info *info, struct mdt_object *o,
2428                              struct mdt_lock_handle *lh, __u64 ibits,
2429                              bool nonblock, int locality)
2430 {
2431         int rc;
2432         ENTRY;
2433
2434         if (!mdt_object_remote(o))
2435                 return mdt_object_local_lock(info, o, lh, ibits, nonblock,
2436                                              locality);
2437
2438         if (locality == MDT_LOCAL_LOCK) {
2439                 CERROR("%s: try to get local lock for remote object"
2440                        DFID".\n", mdt_obd_name(info->mti_mdt),
2441                        PFID(mdt_object_fid(o)));
2442                 RETURN(-EPROTO);
2443         }
2444
2445         /* XXX do not support PERM/LAYOUT/XATTR lock for remote object yet */
2446         ibits &= ~(MDS_INODELOCK_PERM | MDS_INODELOCK_LAYOUT |
2447                    MDS_INODELOCK_XATTR);
2448         if (ibits & MDS_INODELOCK_UPDATE) {
2449                 /* Sigh, PDO needs to enqueue 2 locks right now, but
2450                  * enqueue RPC can only request 1 lock, to avoid extra
2451                  * RPC, so it will instead enqueue EX lock for remote
2452                  * object anyway XXX*/
2453                 if (lh->mlh_type == MDT_PDO_LOCK &&
2454                     lh->mlh_pdo_hash != 0) {
2455                         CDEBUG(D_INFO, "%s: "DFID" convert PDO lock to"
2456                                "EX lock.\n", mdt_obd_name(info->mti_mdt),
2457                                PFID(mdt_object_fid(o)));
2458                         lh->mlh_pdo_hash = 0;
2459                         lh->mlh_rreg_mode = LCK_EX;
2460                         lh->mlh_type = MDT_REG_LOCK;
2461                 }
2462                 rc = mdt_remote_object_lock(info, o, mdt_object_fid(o),
2463                                             &lh->mlh_rreg_lh,
2464                                             lh->mlh_rreg_mode,
2465                                             MDS_INODELOCK_UPDATE);
2466                 if (rc != ELDLM_OK)
2467                         RETURN(rc);
2468         }
2469
2470         /* Only enqueue LOOKUP lock for remote object */
2471         if (ibits & MDS_INODELOCK_LOOKUP) {
2472                 rc = mdt_object_local_lock(info, o, lh,
2473                                            MDS_INODELOCK_LOOKUP,
2474                                            nonblock, locality);
2475                 if (rc != ELDLM_OK)
2476                         RETURN(rc);
2477         }
2478
2479         RETURN(0);
2480 }
2481
2482 int mdt_object_lock(struct mdt_thread_info *info, struct mdt_object *o,
2483                     struct mdt_lock_handle *lh, __u64 ibits, int locality)
2484 {
2485         return mdt_object_lock_internal(info, o, lh, ibits, false, locality);
2486 }
2487
2488 int mdt_object_lock_try(struct mdt_thread_info *info, struct mdt_object *o,
2489                         struct mdt_lock_handle *lh, __u64 ibits, int locality)
2490 {
2491         struct mdt_lock_handle tmp = *lh;
2492         int rc;
2493
2494         rc = mdt_object_lock_internal(info, o, &tmp, ibits, true, locality);
2495         if (rc == 0)
2496                 *lh = tmp;
2497
2498         return rc == 0;
2499 }
2500
2501 /**
2502  * Save a lock within request object.
2503  *
2504  * Keep the lock referenced until whether client ACK or transaction
2505  * commit happens or release the lock immediately depending on input
2506  * parameters. If COS is ON, a write lock is converted to COS lock
2507  * before saving.
2508  *
2509  * \param info thead info object
2510  * \param h lock handle
2511  * \param mode lock mode
2512  * \param decref force immediate lock releasing
2513  */
2514 static
2515 void mdt_save_lock(struct mdt_thread_info *info, struct lustre_handle *h,
2516                    ldlm_mode_t mode, int decref)
2517 {
2518         ENTRY;
2519
2520         if (lustre_handle_is_used(h)) {
2521                 if (decref || !info->mti_has_trans ||
2522                     !(mode & (LCK_PW | LCK_EX))){
2523                         mdt_fid_unlock(h, mode);
2524                 } else {
2525                         struct mdt_device *mdt = info->mti_mdt;
2526                         struct ldlm_lock *lock = ldlm_handle2lock(h);
2527                         struct ptlrpc_request *req = mdt_info_req(info);
2528                         int no_ack = 0;
2529
2530                         LASSERTF(lock != NULL, "no lock for cookie "LPX64"\n",
2531                                  h->cookie);
2532                         /* there is no request if mdt_object_unlock() is called
2533                          * from mdt_export_cleanup()->mdt_add_dirty_flag() */
2534                         if (likely(req != NULL)) {
2535                                 CDEBUG(D_HA, "request = %p reply state = %p"
2536                                        " transno = "LPD64"\n", req,
2537                                        req->rq_reply_state, req->rq_transno);
2538                                 if (mdt_cos_is_enabled(mdt)) {
2539                                         no_ack = 1;
2540                                         ldlm_lock_downgrade(lock, LCK_COS);
2541                                         mode = LCK_COS;
2542                                 }
2543                                 ptlrpc_save_lock(req, h, mode, no_ack);
2544                         } else {
2545                                 ldlm_lock_decref(h, mode);
2546                         }
2547                         if (mdt_is_lock_sync(lock)) {
2548                                 CDEBUG(D_HA, "found sync-lock,"
2549                                        " async commit started\n");
2550                                 mdt_device_commit_async(info->mti_env,
2551                                                         mdt);
2552                         }
2553                         LDLM_LOCK_PUT(lock);
2554                 }
2555                 h->cookie = 0ull;
2556         }
2557
2558         EXIT;
2559 }
2560
2561 /**
2562  * Unlock mdt object.
2563  *
2564  * Immeditely release the regular lock and the PDO lock or save the
2565  * lock in reqeuest and keep them referenced until client ACK or
2566  * transaction commit.
2567  *
2568  * \param info thread info object
2569  * \param o mdt object
2570  * \param lh mdt lock handle referencing regular and PDO locks
2571  * \param decref force immediate lock releasing
2572  */
2573 void mdt_object_unlock(struct mdt_thread_info *info, struct mdt_object *o,
2574                        struct mdt_lock_handle *lh, int decref)
2575 {
2576         ENTRY;
2577
2578         mdt_save_lock(info, &lh->mlh_pdo_lh, lh->mlh_pdo_mode, decref);
2579         mdt_save_lock(info, &lh->mlh_reg_lh, lh->mlh_reg_mode, decref);
2580
2581         if (lustre_handle_is_used(&lh->mlh_rreg_lh))
2582                 ldlm_lock_decref(&lh->mlh_rreg_lh, lh->mlh_rreg_mode);
2583
2584         EXIT;
2585 }
2586
2587 struct mdt_object *mdt_object_find_lock(struct mdt_thread_info *info,
2588                                         const struct lu_fid *f,
2589                                         struct mdt_lock_handle *lh,
2590                                         __u64 ibits)
2591 {
2592         struct mdt_object *o;
2593
2594         o = mdt_object_find(info->mti_env, info->mti_mdt, f);
2595         if (!IS_ERR(o)) {
2596                 int rc;
2597
2598                 rc = mdt_object_lock(info, o, lh, ibits,
2599                                      MDT_LOCAL_LOCK);
2600                 if (rc != 0) {
2601                         mdt_object_put(info->mti_env, o);
2602                         o = ERR_PTR(rc);
2603                 }
2604         }
2605         return o;
2606 }
2607
2608 void mdt_object_unlock_put(struct mdt_thread_info * info,
2609                            struct mdt_object * o,
2610                            struct mdt_lock_handle *lh,
2611                            int decref)
2612 {
2613         mdt_object_unlock(info, o, lh, decref);
2614         mdt_object_put(info->mti_env, o);
2615 }
2616
2617 /*
2618  * Generic code handling requests that have struct mdt_body passed in:
2619  *
2620  *  - extract mdt_body from request and save it in @info, if present;
2621  *
2622  *  - create lu_object, corresponding to the fid in mdt_body, and save it in
2623  *  @info;
2624  *
2625  *  - if HABEO_CORPUS flag is set for this request type check whether object
2626  *  actually exists on storage (lu_object_exists()).
2627  *
2628  */
2629 static int mdt_body_unpack(struct mdt_thread_info *info, __u32 flags)
2630 {
2631         const struct mdt_body    *body;
2632         struct mdt_object        *obj;
2633         const struct lu_env      *env;
2634         struct req_capsule       *pill;
2635         int                       rc;
2636         ENTRY;
2637
2638         env = info->mti_env;
2639         pill = info->mti_pill;
2640
2641         body = info->mti_body = req_capsule_client_get(pill, &RMF_MDT_BODY);
2642         if (body == NULL)
2643                 RETURN(-EFAULT);
2644
2645         if (!(body->valid & OBD_MD_FLID))
2646                 RETURN(0);
2647
2648         if (!fid_is_sane(&body->fid1)) {
2649                 CERROR("Invalid fid: "DFID"\n", PFID(&body->fid1));
2650                 RETURN(-EINVAL);
2651         }
2652
2653         /*
2654          * Do not get size or any capa fields before we check that request
2655          * contains capa actually. There are some requests which do not, for
2656          * instance MDS_IS_SUBDIR.
2657          */
2658         if (req_capsule_has_field(pill, &RMF_CAPA1, RCL_CLIENT) &&
2659             req_capsule_get_size(pill, &RMF_CAPA1, RCL_CLIENT))
2660                 mdt_set_capainfo(info, 0, &body->fid1,
2661                                  req_capsule_client_get(pill, &RMF_CAPA1));
2662
2663         obj = mdt_object_find(env, info->mti_mdt, &body->fid1);
2664         if (!IS_ERR(obj)) {
2665                 if ((flags & HABEO_CORPUS) &&
2666                     !mdt_object_exists(obj)) {
2667                         mdt_object_put(env, obj);
2668                         /* for capability renew ENOENT will be handled in
2669                          * mdt_renew_capa */
2670                         if (body->valid & OBD_MD_FLOSSCAPA)
2671                                 rc = 0;
2672                         else
2673                                 rc = -ENOENT;
2674                 } else {
2675                         info->mti_object = obj;
2676                         rc = 0;
2677                 }
2678         } else
2679                 rc = PTR_ERR(obj);
2680
2681         RETURN(rc);
2682 }
2683
2684 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags)
2685 {
2686         struct req_capsule *pill = info->mti_pill;
2687         int rc;
2688         ENTRY;
2689
2690         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT))
2691                 rc = mdt_body_unpack(info, flags);
2692         else
2693                 rc = 0;
2694
2695         if (rc == 0 && (flags & HABEO_REFERO)) {
2696                 /* Pack reply. */
2697                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
2698                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
2699                                              info->mti_body->eadatasize);
2700                 if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
2701                         req_capsule_set_size(pill, &RMF_LOGCOOKIES,
2702                                              RCL_SERVER, 0);
2703
2704                 rc = req_capsule_server_pack(pill);
2705         }
2706         RETURN(rc);
2707 }
2708
2709 static int mdt_init_capa_ctxt(const struct lu_env *env, struct mdt_device *m)
2710 {
2711         struct md_device *next = m->mdt_child;
2712
2713         return next->md_ops->mdo_init_capa_ctxt(env, next,
2714                                                 m->mdt_lut.lut_mds_capa,
2715                                                 m->mdt_capa_timeout,
2716                                                 m->mdt_capa_alg,
2717                                                 m->mdt_capa_keys);
2718 }
2719
2720 void mdt_lock_handle_init(struct mdt_lock_handle *lh)
2721 {
2722         lh->mlh_type = MDT_NUL_LOCK;
2723         lh->mlh_reg_lh.cookie = 0ull;
2724         lh->mlh_reg_mode = LCK_MINMODE;
2725         lh->mlh_pdo_lh.cookie = 0ull;
2726         lh->mlh_pdo_mode = LCK_MINMODE;
2727         lh->mlh_rreg_lh.cookie = 0ull;
2728         lh->mlh_rreg_mode = LCK_MINMODE;
2729 }
2730
2731 void mdt_lock_handle_fini(struct mdt_lock_handle *lh)
2732 {
2733         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2734         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2735 }
2736
2737 /*
2738  * Initialize fields of struct mdt_thread_info. Other fields are left in
2739  * uninitialized state, because it's too expensive to zero out whole
2740  * mdt_thread_info (> 1K) on each request arrival.
2741  */
2742 void mdt_thread_info_init(struct ptlrpc_request *req,
2743                           struct mdt_thread_info *info)
2744 {
2745         int i;
2746
2747         info->mti_pill = &req->rq_pill;
2748
2749         /* lock handle */
2750         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
2751                 mdt_lock_handle_init(&info->mti_lh[i]);
2752
2753         /* mdt device: it can be NULL while CONNECT */
2754         if (req->rq_export) {
2755                 info->mti_mdt = mdt_dev(req->rq_export->exp_obd->obd_lu_dev);
2756                 info->mti_exp = req->rq_export;
2757         } else
2758                 info->mti_mdt = NULL;
2759         info->mti_env = req->rq_svc_thread->t_env;
2760         info->mti_transno = lustre_msg_get_transno(req->rq_reqmsg);
2761
2762         memset(&info->mti_attr, 0, sizeof(info->mti_attr));
2763         info->mti_big_buf = LU_BUF_NULL;
2764         info->mti_body = NULL;
2765         info->mti_object = NULL;
2766         info->mti_dlm_req = NULL;
2767         info->mti_has_trans = 0;
2768         info->mti_cross_ref = 0;
2769         info->mti_opdata = 0;
2770         info->mti_big_lmm_used = 0;
2771
2772         info->mti_spec.no_create = 0;
2773         info->mti_spec.sp_rm_entry = 0;
2774
2775         info->mti_spec.u.sp_ea.eadata = NULL;
2776         info->mti_spec.u.sp_ea.eadatalen = 0;
2777 }
2778
2779 void mdt_thread_info_fini(struct mdt_thread_info *info)
2780 {
2781         int i;
2782
2783         if (info->mti_object != NULL) {
2784                 mdt_object_put(info->mti_env, info->mti_object);
2785                 info->mti_object = NULL;
2786         }
2787
2788         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
2789                 mdt_lock_handle_fini(&info->mti_lh[i]);
2790         info->mti_env = NULL;
2791         info->mti_pill = NULL;
2792         info->mti_exp = NULL;
2793
2794         if (unlikely(info->mti_big_buf.lb_buf != NULL))
2795                 lu_buf_free(&info->mti_big_buf);
2796 }
2797
2798 struct mdt_thread_info *tsi2mdt_info(struct tgt_session_info *tsi)
2799 {
2800         struct mdt_thread_info  *mti;
2801         struct lustre_capa      *lc;
2802
2803         mti = mdt_th_info(tsi->tsi_env);
2804         LASSERT(mti != NULL);
2805
2806         mdt_thread_info_init(tgt_ses_req(tsi), mti);
2807         if (tsi->tsi_corpus != NULL) {
2808                 struct req_capsule *pill = tsi->tsi_pill;
2809
2810                 mti->mti_object = mdt_obj(tsi->tsi_corpus);
2811                 lu_object_get(tsi->tsi_corpus);
2812
2813                 /*
2814                  * XXX: must be part of tgt_mdt_body_unpack but moved here
2815                  * due to mdt_set_capainfo().
2816                  */
2817                 if (req_capsule_has_field(pill, &RMF_CAPA1, RCL_CLIENT) &&
2818                     req_capsule_get_size(pill, &RMF_CAPA1, RCL_CLIENT) > 0) {
2819                         lc = req_capsule_client_get(pill, &RMF_CAPA1);
2820                         mdt_set_capainfo(mti, 0, &tsi->tsi_mdt_body->fid1, lc);
2821                 }
2822         }
2823         mti->mti_body = tsi->tsi_mdt_body;
2824         mti->mti_dlm_req = tsi->tsi_dlm_req;
2825
2826         return mti;
2827 }
2828
2829 int mdt_tgt_connect(struct tgt_session_info *tsi)
2830 {
2831         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2832         int                      rc;
2833
2834         ENTRY;
2835
2836         rc = tgt_connect(tsi);
2837         if (rc != 0)
2838                 RETURN(rc);
2839
2840         rc = mdt_init_idmap(tsi);
2841         if (rc != 0)
2842                 GOTO(err, rc);
2843         RETURN(0);
2844 err:
2845         obd_disconnect(class_export_get(req->rq_export));
2846         return rc;
2847 }
2848
2849 enum mdt_it_code {
2850         MDT_IT_OPEN,
2851         MDT_IT_OCREAT,
2852         MDT_IT_CREATE,
2853         MDT_IT_GETATTR,
2854         MDT_IT_READDIR,
2855         MDT_IT_LOOKUP,
2856         MDT_IT_UNLINK,
2857         MDT_IT_TRUNC,
2858         MDT_IT_GETXATTR,
2859         MDT_IT_LAYOUT,
2860         MDT_IT_QUOTA,
2861         MDT_IT_NR
2862 };
2863
2864 static int mdt_intent_getattr(enum mdt_it_code opcode,
2865                               struct mdt_thread_info *info,
2866                               struct ldlm_lock **,
2867                               __u64);
2868
2869 static int mdt_intent_getxattr(enum mdt_it_code opcode,
2870                                 struct mdt_thread_info *info,
2871                                 struct ldlm_lock **lockp,
2872                                 __u64 flags);
2873
2874 static int mdt_intent_layout(enum mdt_it_code opcode,
2875                              struct mdt_thread_info *info,
2876                              struct ldlm_lock **,
2877                              __u64);
2878 static int mdt_intent_reint(enum mdt_it_code opcode,
2879                             struct mdt_thread_info *info,
2880                             struct ldlm_lock **,
2881                             __u64);
2882
2883 static struct mdt_it_flavor {
2884         const struct req_format *it_fmt;
2885         __u32                    it_flags;
2886         int                    (*it_act)(enum mdt_it_code ,
2887                                          struct mdt_thread_info *,
2888                                          struct ldlm_lock **,
2889                                          __u64);
2890         long                     it_reint;
2891 } mdt_it_flavor[] = {
2892         [MDT_IT_OPEN]     = {
2893                 .it_fmt   = &RQF_LDLM_INTENT,
2894                 /*.it_flags = HABEO_REFERO,*/
2895                 .it_flags = 0,
2896                 .it_act   = mdt_intent_reint,
2897                 .it_reint = REINT_OPEN
2898         },
2899         [MDT_IT_OCREAT]   = {
2900                 .it_fmt   = &RQF_LDLM_INTENT,
2901                 /*
2902                  * OCREAT is not a MUTABOR request as if the file
2903                  * already exists.
2904                  * We do the extra check of OBD_CONNECT_RDONLY in
2905                  * mdt_reint_open() when we really need to create
2906                  * the object.
2907                  */
2908                 .it_flags = 0,
2909                 .it_act   = mdt_intent_reint,
2910                 .it_reint = REINT_OPEN
2911         },
2912         [MDT_IT_CREATE]   = {
2913                 .it_fmt   = &RQF_LDLM_INTENT,
2914                 .it_flags = MUTABOR,
2915                 .it_act   = mdt_intent_reint,
2916                 .it_reint = REINT_CREATE
2917         },
2918         [MDT_IT_GETATTR]  = {
2919                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
2920                 .it_flags = HABEO_REFERO,
2921                 .it_act   = mdt_intent_getattr
2922         },
2923         [MDT_IT_READDIR]  = {
2924                 .it_fmt   = NULL,
2925                 .it_flags = 0,
2926                 .it_act   = NULL
2927         },
2928         [MDT_IT_LOOKUP]   = {
2929                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
2930                 .it_flags = HABEO_REFERO,
2931                 .it_act   = mdt_intent_getattr
2932         },
2933         [MDT_IT_UNLINK]   = {
2934                 .it_fmt   = &RQF_LDLM_INTENT_UNLINK,
2935                 .it_flags = MUTABOR,
2936                 .it_act   = NULL,
2937                 .it_reint = REINT_UNLINK
2938         },
2939         [MDT_IT_TRUNC]    = {
2940                 .it_fmt   = NULL,
2941                 .it_flags = MUTABOR,
2942                 .it_act   = NULL
2943         },
2944         [MDT_IT_GETXATTR] = {
2945                 .it_fmt   = &RQF_LDLM_INTENT_GETXATTR,
2946                 .it_flags = HABEO_CORPUS,
2947                 .it_act   = mdt_intent_getxattr
2948         },
2949         [MDT_IT_LAYOUT] = {
2950                 .it_fmt   = &RQF_LDLM_INTENT_LAYOUT,
2951                 .it_flags = 0,
2952                 .it_act   = mdt_intent_layout
2953         }
2954 };
2955
2956 int mdt_intent_lock_replace(struct mdt_thread_info *info,
2957                             struct ldlm_lock **lockp,
2958                             struct ldlm_lock *new_lock,
2959                             struct mdt_lock_handle *lh,
2960                             __u64 flags)
2961 {
2962         struct ptlrpc_request  *req = mdt_info_req(info);
2963         struct ldlm_lock       *lock = *lockp;
2964
2965         /*
2966          * Get new lock only for cases when possible resent did not find any
2967          * lock.
2968          */
2969         if (new_lock == NULL)
2970                 new_lock = ldlm_handle2lock_long(&lh->mlh_reg_lh, 0);
2971
2972         if (new_lock == NULL && (flags & LDLM_FL_INTENT_ONLY)) {
2973                 lh->mlh_reg_lh.cookie = 0;
2974                 RETURN(0);
2975         }
2976
2977         LASSERTF(new_lock != NULL,
2978                  "lockh "LPX64"\n", lh->mlh_reg_lh.cookie);
2979
2980         /*
2981          * If we've already given this lock to a client once, then we should
2982          * have no readers or writers.  Otherwise, we should have one reader
2983          * _or_ writer ref (which will be zeroed below) before returning the
2984          * lock to a client.
2985          */
2986         if (new_lock->l_export == req->rq_export) {
2987                 LASSERT(new_lock->l_readers + new_lock->l_writers == 0);
2988         } else {
2989                 LASSERT(new_lock->l_export == NULL);
2990                 LASSERT(new_lock->l_readers + new_lock->l_writers == 1);
2991         }
2992
2993         *lockp = new_lock;
2994
2995         if (new_lock->l_export == req->rq_export) {
2996                 /*
2997                  * Already gave this to the client, which means that we
2998                  * reconstructed a reply.
2999                  */
3000                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) &
3001                         MSG_RESENT);
3002                 lh->mlh_reg_lh.cookie = 0;
3003                 RETURN(ELDLM_LOCK_REPLACED);
3004         }
3005
3006         /*
3007          * Fixup the lock to be given to the client.
3008          */
3009         lock_res_and_lock(new_lock);
3010         /* Zero new_lock->l_readers and new_lock->l_writers without triggering
3011          * possible blocking AST. */
3012         while (new_lock->l_readers > 0) {
3013                 lu_ref_del(&new_lock->l_reference, "reader", new_lock);
3014                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
3015                 new_lock->l_readers--;
3016         }
3017         while (new_lock->l_writers > 0) {
3018                 lu_ref_del(&new_lock->l_reference, "writer", new_lock);
3019                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
3020                 new_lock->l_writers--;
3021         }
3022
3023         new_lock->l_export = class_export_lock_get(req->rq_export, new_lock);
3024         new_lock->l_blocking_ast = lock->l_blocking_ast;
3025         new_lock->l_completion_ast = lock->l_completion_ast;
3026         new_lock->l_remote_handle = lock->l_remote_handle;
3027         new_lock->l_flags &= ~LDLM_FL_LOCAL;
3028
3029         unlock_res_and_lock(new_lock);
3030
3031         cfs_hash_add(new_lock->l_export->exp_lock_hash,
3032                      &new_lock->l_remote_handle,
3033                      &new_lock->l_exp_hash);
3034
3035         LDLM_LOCK_RELEASE(new_lock);
3036         lh->mlh_reg_lh.cookie = 0;
3037
3038         RETURN(ELDLM_LOCK_REPLACED);
3039 }
3040
3041 static void mdt_intent_fixup_resent(struct mdt_thread_info *info,
3042                                     struct ldlm_lock *new_lock,
3043                                     struct ldlm_lock **old_lock,
3044                                     struct mdt_lock_handle *lh,
3045                                     enum mdt_it_code opcode)
3046 {
3047         struct ptlrpc_request  *req = mdt_info_req(info);
3048         struct obd_export      *exp = req->rq_export;
3049         struct lustre_handle    remote_hdl;
3050         struct ldlm_request    *dlmreq;
3051         struct ldlm_lock       *lock;
3052
3053         if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))
3054                 return;
3055
3056         dlmreq = req_capsule_client_get(info->mti_pill, &RMF_DLM_REQ);
3057         remote_hdl = dlmreq->lock_handle[0];
3058         /* If the client does not require open lock, it does not need to
3059          * search lock in exp_lock_hash, since the server thread will
3060          * make sure the lock will be released, and the resend request
3061          * can always re-enqueue the lock */
3062         if ((opcode != MDT_IT_OPEN) || (opcode == MDT_IT_OPEN &&
3063             info->mti_spec.sp_cr_flags & MDS_OPEN_LOCK)) {
3064                 /* In the function below, .hs_keycmp resolves to
3065                  * ldlm_export_lock_keycmp() */
3066                 /* coverity[overrun-buffer-val] */
3067                 lock = cfs_hash_lookup(exp->exp_lock_hash, &remote_hdl);
3068                 if (lock) {
3069                         lock_res_and_lock(lock);
3070                         if (lock != new_lock) {
3071                                 lh->mlh_reg_lh.cookie = lock->l_handle.h_cookie;
3072                                 lh->mlh_reg_mode = lock->l_granted_mode;
3073
3074                                 LDLM_DEBUG(lock, "Restoring lock cookie");
3075                                 DEBUG_REQ(D_DLMTRACE, req,
3076                                           "restoring lock cookie "LPX64,
3077                                           lh->mlh_reg_lh.cookie);
3078                                 if (old_lock)
3079                                         *old_lock = LDLM_LOCK_GET(lock);
3080                                 cfs_hash_put(exp->exp_lock_hash,
3081                                              &lock->l_exp_hash);
3082                                 unlock_res_and_lock(lock);
3083                                 return;
3084                         }
3085                         cfs_hash_put(exp->exp_lock_hash, &lock->l_exp_hash);
3086                         unlock_res_and_lock(lock);
3087                 }
3088         }
3089         /*
3090          * If the xid matches, then we know this is a resent request, and allow
3091          * it. (It's probably an OPEN, for which we don't send a lock.
3092          */
3093         if (req_xid_is_last(req))
3094                 return;
3095
3096         /*
3097          * This remote handle isn't enqueued, so we never received or processed
3098          * this request.  Clear MSG_RESENT, because it can be handled like any
3099          * normal request now.
3100          */
3101         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
3102
3103         DEBUG_REQ(D_DLMTRACE, req, "no existing lock with rhandle "LPX64,
3104                   remote_hdl.cookie);
3105 }
3106
3107 static int mdt_intent_getxattr(enum mdt_it_code opcode,
3108                                 struct mdt_thread_info *info,
3109                                 struct ldlm_lock **lockp,
3110                                 __u64 flags)
3111 {
3112         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3113         struct ldlm_reply      *ldlm_rep = NULL;
3114         int rc, grc;
3115
3116         /*
3117          * Initialize lhc->mlh_reg_lh either from a previously granted lock
3118          * (for the resend case) or a new lock. Below we will use it to
3119          * replace the original lock.
3120          */
3121         mdt_intent_fixup_resent(info, *lockp, NULL, lhc, opcode);
3122         if (!lustre_handle_is_used(&lhc->mlh_reg_lh)) {
3123                 mdt_lock_reg_init(lhc, (*lockp)->l_req_mode);
3124                 rc = mdt_object_lock(info, info->mti_object, lhc,
3125                                         MDS_INODELOCK_XATTR,
3126                                         MDT_LOCAL_LOCK);
3127                 if (rc)
3128                         return rc;
3129         }
3130
3131         grc = mdt_getxattr(info);
3132
3133         rc = mdt_intent_lock_replace(info, lockp, NULL, lhc, flags);
3134
3135         if (mdt_info_req(info)->rq_repmsg != NULL)
3136                 ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3137         if (ldlm_rep == NULL)
3138                 RETURN(err_serious(-EFAULT));
3139
3140         ldlm_rep->lock_policy_res2 = grc;
3141
3142         return rc;
3143 }
3144
3145 static int mdt_intent_getattr(enum mdt_it_code opcode,
3146                               struct mdt_thread_info *info,
3147                               struct ldlm_lock **lockp,
3148                               __u64 flags)
3149 {
3150         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3151         struct ldlm_lock       *new_lock = NULL;
3152         __u64                   child_bits;
3153         struct ldlm_reply      *ldlm_rep;
3154         struct ptlrpc_request  *req;
3155         struct mdt_body        *reqbody;
3156         struct mdt_body        *repbody;
3157         int                     rc, rc2;
3158         ENTRY;
3159
3160         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
3161         LASSERT(reqbody);
3162
3163         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
3164         LASSERT(repbody);
3165
3166         info->mti_cross_ref = !!(reqbody->valid & OBD_MD_FLCROSSREF);
3167         repbody->eadatasize = 0;