Whamcloud - gitweb
LU-4690 osp: some cleanup for patch 9511
[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 #include <lustre_ioctl.h>
57 /* struct ptlrpc_request */
58 #include <lustre_net.h>
59 /* struct obd_export */
60 #include <lustre_export.h>
61 /* struct obd_device */
62 #include <obd.h>
63 /* lu2dt_dev() */
64 #include <dt_object.h>
65 #include <lustre_mds.h>
66 #include <lustre_log.h>
67 #include "mdt_internal.h"
68 #include <lustre_acl.h>
69 #include <lustre_param.h>
70 #include <lustre_quota.h>
71 #include <lustre_lfsck.h>
72
73 mdl_mode_t mdt_mdl_lock_modes[] = {
74         [LCK_MINMODE] = MDL_MINMODE,
75         [LCK_EX]      = MDL_EX,
76         [LCK_PW]      = MDL_PW,
77         [LCK_PR]      = MDL_PR,
78         [LCK_CW]      = MDL_CW,
79         [LCK_CR]      = MDL_CR,
80         [LCK_NL]      = MDL_NL,
81         [LCK_GROUP]   = MDL_GROUP
82 };
83
84 ldlm_mode_t mdt_dlm_lock_modes[] = {
85         [MDL_MINMODE] = LCK_MINMODE,
86         [MDL_EX]      = LCK_EX,
87         [MDL_PW]      = LCK_PW,
88         [MDL_PR]      = LCK_PR,
89         [MDL_CW]      = LCK_CW,
90         [MDL_CR]      = LCK_CR,
91         [MDL_NL]      = LCK_NL,
92         [MDL_GROUP]   = LCK_GROUP
93 };
94
95 static struct mdt_device *mdt_dev(struct lu_device *d);
96 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags);
97
98 static const struct lu_object_operations mdt_obj_ops;
99
100 /* Slab for MDT object allocation */
101 static struct kmem_cache *mdt_object_kmem;
102
103 /* For HSM restore handles */
104 struct kmem_cache *mdt_hsm_cdt_kmem;
105
106 /* For HSM request handles */
107 struct kmem_cache *mdt_hsm_car_kmem;
108
109 static struct lu_kmem_descr mdt_caches[] = {
110         {
111                 .ckd_cache = &mdt_object_kmem,
112                 .ckd_name  = "mdt_obj",
113                 .ckd_size  = sizeof(struct mdt_object)
114         },
115         {
116                 .ckd_cache      = &mdt_hsm_cdt_kmem,
117                 .ckd_name       = "mdt_cdt_restore_handle",
118                 .ckd_size       = sizeof(struct cdt_restore_handle)
119         },
120         {
121                 .ckd_cache      = &mdt_hsm_car_kmem,
122                 .ckd_name       = "mdt_cdt_agent_req",
123                 .ckd_size       = sizeof(struct cdt_agent_req)
124         },
125         {
126                 .ckd_cache = NULL
127         }
128 };
129
130 int mdt_get_disposition(struct ldlm_reply *rep, int flag)
131 {
132         if (!rep)
133                 return 0;
134         return (rep->lock_policy_res1 & flag);
135 }
136
137 void mdt_clear_disposition(struct mdt_thread_info *info,
138                            struct ldlm_reply *rep, int flag)
139 {
140         if (info) {
141                 info->mti_opdata &= ~flag;
142                 tgt_opdata_clear(info->mti_env, flag);
143         }
144         if (rep)
145                 rep->lock_policy_res1 &= ~flag;
146 }
147
148 void mdt_set_disposition(struct mdt_thread_info *info,
149                          struct ldlm_reply *rep, int flag)
150 {
151         if (info) {
152                 info->mti_opdata |= flag;
153                 tgt_opdata_set(info->mti_env, flag);
154         }
155         if (rep)
156                 rep->lock_policy_res1 |= flag;
157 }
158
159 void mdt_lock_reg_init(struct mdt_lock_handle *lh, ldlm_mode_t lm)
160 {
161         lh->mlh_pdo_hash = 0;
162         lh->mlh_reg_mode = lm;
163         lh->mlh_rreg_mode = lm;
164         lh->mlh_type = MDT_REG_LOCK;
165 }
166
167 void mdt_lock_pdo_init(struct mdt_lock_handle *lh, ldlm_mode_t lock_mode,
168                        const struct lu_name *lname)
169 {
170         lh->mlh_reg_mode = lock_mode;
171         lh->mlh_rreg_mode = lock_mode;
172         lh->mlh_type = MDT_PDO_LOCK;
173
174         if (lu_name_is_valid(lname)) {
175                 lh->mlh_pdo_hash = full_name_hash(lname->ln_name,
176                                                   lname->ln_namelen);
177                 /* XXX Workaround for LU-2856
178                  *
179                  * Zero is a valid return value of full_name_hash, but
180                  * several users of mlh_pdo_hash assume a non-zero
181                  * hash value. We therefore map zero onto an
182                  * arbitrary, but consistent value (1) to avoid
183                  * problems further down the road. */
184                 if (unlikely(lh->mlh_pdo_hash == 0))
185                         lh->mlh_pdo_hash = 1;
186         } else {
187                 lh->mlh_pdo_hash = 0;
188         }
189 }
190
191 static void mdt_lock_pdo_mode(struct mdt_thread_info *info, struct mdt_object *o,
192                               struct mdt_lock_handle *lh)
193 {
194         mdl_mode_t mode;
195         ENTRY;
196
197         /*
198          * Any dir access needs couple of locks:
199          *
200          * 1) on part of dir we gonna take lookup/modify;
201          *
202          * 2) on whole dir to protect it from concurrent splitting and/or to
203          * flush client's cache for readdir().
204          *
205          * so, for a given mode and object this routine decides what lock mode
206          * to use for lock #2:
207          *
208          * 1) if caller's gonna lookup in dir then we need to protect dir from
209          * being splitted only - LCK_CR
210          *
211          * 2) if caller's gonna modify dir then we need to protect dir from
212          * being splitted and to flush cache - LCK_CW
213          *
214          * 3) if caller's gonna modify dir and that dir seems ready for
215          * splitting then we need to protect it from any type of access
216          * (lookup/modify/split) - LCK_EX --bzzz
217          */
218
219         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
220         LASSERT(lh->mlh_pdo_mode == LCK_MINMODE);
221
222         /*
223          * Ask underlaying level its opinion about preferable PDO lock mode
224          * having access type passed as regular lock mode:
225          *
226          * - MDL_MINMODE means that lower layer does not want to specify lock
227          * mode;
228          *
229          * - MDL_NL means that no PDO lock should be taken. This is used in some
230          * cases. Say, for non-splittable directories no need to use PDO locks
231          * at all.
232          */
233         mode = mdo_lock_mode(info->mti_env, mdt_object_child(o),
234                              mdt_dlm_mode2mdl_mode(lh->mlh_reg_mode));
235
236         if (mode != MDL_MINMODE) {
237                 lh->mlh_pdo_mode = mdt_mdl_mode2dlm_mode(mode);
238         } else {
239                 /*
240                  * Lower layer does not want to specify locking mode. We do it
241                  * our selves. No special protection is needed, just flush
242                  * client's cache on modification and allow concurrent
243                  * mondification.
244                  */
245                 switch (lh->mlh_reg_mode) {
246                 case LCK_EX:
247                         lh->mlh_pdo_mode = LCK_EX;
248                         break;
249                 case LCK_PR:
250                         lh->mlh_pdo_mode = LCK_CR;
251                         break;
252                 case LCK_PW:
253                         lh->mlh_pdo_mode = LCK_CW;
254                         break;
255                 default:
256                         CERROR("Not expected lock type (0x%x)\n",
257                                (int)lh->mlh_reg_mode);
258                         LBUG();
259                 }
260         }
261
262         LASSERT(lh->mlh_pdo_mode != LCK_MINMODE);
263         EXIT;
264 }
265
266 static int mdt_getstatus(struct tgt_session_info *tsi)
267 {
268         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
269         struct mdt_device       *mdt = info->mti_mdt;
270         struct mdt_body         *repbody;
271         int                      rc;
272
273         ENTRY;
274
275         rc = mdt_check_ucred(info);
276         if (rc)
277                 GOTO(out, rc = err_serious(rc));
278
279         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETSTATUS_PACK))
280                 GOTO(out, rc = err_serious(-ENOMEM));
281
282         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
283         repbody->fid1 = mdt->mdt_md_root_fid;
284         repbody->valid |= OBD_MD_FLID;
285
286         if (tsi->tsi_tgt->lut_mds_capa &&
287             exp_connect_flags(info->mti_exp) & OBD_CONNECT_MDS_CAPA) {
288                 struct mdt_object       *root;
289                 struct lustre_capa      *capa;
290
291                 root = mdt_object_find(info->mti_env, mdt, &repbody->fid1);
292                 if (IS_ERR(root))
293                         GOTO(out, rc = PTR_ERR(root));
294
295                 capa = req_capsule_server_get(info->mti_pill, &RMF_CAPA1);
296                 LASSERT(capa);
297                 capa->lc_opc = CAPA_OPC_MDS_DEFAULT;
298                 rc = mo_capa_get(info->mti_env, mdt_object_child(root), capa,
299                                  0);
300                 mdt_object_put(info->mti_env, root);
301                 if (rc == 0)
302                         repbody->valid |= OBD_MD_FLMDSCAPA;
303         }
304         EXIT;
305 out:
306         mdt_thread_info_fini(info);
307         return rc;
308 }
309
310 static int mdt_statfs(struct tgt_session_info *tsi)
311 {
312         struct ptlrpc_request           *req = tgt_ses_req(tsi);
313         struct mdt_thread_info          *info = tsi2mdt_info(tsi);
314         struct md_device                *next = info->mti_mdt->mdt_child;
315         struct ptlrpc_service_part      *svcpt;
316         struct obd_statfs               *osfs;
317         int                             rc;
318
319         ENTRY;
320
321         svcpt = req->rq_rqbd->rqbd_svcpt;
322
323         /* This will trigger a watchdog timeout */
324         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_STATFS_LCW_SLEEP,
325                          (MDT_SERVICE_WATCHDOG_FACTOR *
326                           at_get(&svcpt->scp_at_estimate)) + 1);
327
328         rc = mdt_check_ucred(info);
329         if (rc)
330                 GOTO(out, rc = err_serious(rc));
331
332         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_PACK))
333                 GOTO(out, rc = err_serious(-ENOMEM));
334
335         osfs = req_capsule_server_get(info->mti_pill, &RMF_OBD_STATFS);
336         if (!osfs)
337                 GOTO(out, rc = -EPROTO);
338
339         /** statfs information are cached in the mdt_device */
340         if (cfs_time_before_64(info->mti_mdt->mdt_osfs_age,
341                                cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS))) {
342                 /** statfs data is too old, get up-to-date one */
343                 rc = next->md_ops->mdo_statfs(info->mti_env, next, osfs);
344                 if (rc)
345                         GOTO(out, rc);
346                 spin_lock(&info->mti_mdt->mdt_osfs_lock);
347                 info->mti_mdt->mdt_osfs = *osfs;
348                 info->mti_mdt->mdt_osfs_age = cfs_time_current_64();
349                 spin_unlock(&info->mti_mdt->mdt_osfs_lock);
350         } else {
351                 /** use cached statfs data */
352                 spin_lock(&info->mti_mdt->mdt_osfs_lock);
353                 *osfs = info->mti_mdt->mdt_osfs;
354                 spin_unlock(&info->mti_mdt->mdt_osfs_lock);
355         }
356
357         if (rc == 0)
358                 mdt_counter_incr(req, LPROC_MDT_STATFS);
359 out:
360         mdt_thread_info_fini(info);
361         RETURN(rc);
362 }
363
364 /**
365  * Pack SOM attributes into the reply.
366  * Call under a DLM UPDATE lock.
367  */
368 static void mdt_pack_size2body(struct mdt_thread_info *info,
369                                struct mdt_object *mo)
370 {
371         struct mdt_body *b;
372         struct md_attr *ma = &info->mti_attr;
373
374         LASSERT(ma->ma_attr.la_valid & LA_MODE);
375         b = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
376
377         /* Check if Size-on-MDS is supported, if this is a regular file,
378          * if SOM is enabled on the object and if SOM cache exists and valid.
379          * Otherwise do not pack Size-on-MDS attributes to the reply. */
380         if (!(mdt_conn_flags(info) & OBD_CONNECT_SOM) ||
381             !S_ISREG(ma->ma_attr.la_mode) ||
382             !mdt_object_is_som_enabled(mo) ||
383             !(ma->ma_valid & MA_SOM))
384                 return;
385
386         b->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
387         b->size = ma->ma_som->msd_size;
388         b->blocks = ma->ma_som->msd_blocks;
389 }
390
391 void mdt_pack_attr2body(struct mdt_thread_info *info, struct mdt_body *b,
392                         const struct lu_attr *attr, const struct lu_fid *fid)
393 {
394         struct md_attr *ma = &info->mti_attr;
395
396         LASSERT(ma->ma_valid & MA_INODE);
397
398         b->atime      = attr->la_atime;
399         b->mtime      = attr->la_mtime;
400         b->ctime      = attr->la_ctime;
401         b->mode       = attr->la_mode;
402         b->size       = attr->la_size;
403         b->blocks     = attr->la_blocks;
404         b->uid        = attr->la_uid;
405         b->gid        = attr->la_gid;
406         b->flags      = attr->la_flags;
407         b->nlink      = attr->la_nlink;
408         b->rdev       = attr->la_rdev;
409
410         /*XXX should pack the reply body according to lu_valid*/
411         b->valid |= OBD_MD_FLCTIME | OBD_MD_FLUID   |
412                     OBD_MD_FLGID   | OBD_MD_FLTYPE  |
413                     OBD_MD_FLMODE  | OBD_MD_FLNLINK | OBD_MD_FLFLAGS |
414                     OBD_MD_FLATIME | OBD_MD_FLMTIME ;
415
416         if (!S_ISREG(attr->la_mode)) {
417                 b->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS | OBD_MD_FLRDEV;
418         } else if (ma->ma_need & MA_LOV && !(ma->ma_valid & MA_LOV)) {
419                 /* means no objects are allocated on osts. */
420                 LASSERT(!(ma->ma_valid & MA_LOV));
421                 /* just ignore blocks occupied by extend attributes on MDS */
422                 b->blocks = 0;
423                 /* if no object is allocated on osts, the size on mds is valid. b=22272 */
424                 b->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
425         } else if ((ma->ma_valid & MA_LOV) && ma->ma_lmm != NULL &&
426                    ma->ma_lmm->lmm_pattern & LOV_PATTERN_F_RELEASED) {
427                 /* A released file stores its size on MDS. */
428                 /* But return 1 block for released file, unless tools like tar
429                  * will consider it fully sparse. (LU-3864)
430                  */
431                 if (unlikely(b->size == 0))
432                         b->blocks = 0;
433                 else
434                         b->blocks = 1;
435                 b->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
436         }
437
438         if (fid) {
439                 b->fid1 = *fid;
440                 b->valid |= OBD_MD_FLID;
441                 CDEBUG(D_INODE, DFID": nlink=%d, mode=%o, size="LPU64"\n",
442                                 PFID(fid), b->nlink, b->mode, b->size);
443         }
444
445         if (info)
446                 mdt_body_reverse_idmap(info, b);
447
448         if (fid != NULL && (b->valid & OBD_MD_FLSIZE))
449                 CDEBUG(D_VFSTRACE, DFID": returning size %llu\n",
450                        PFID(fid), (unsigned long long)b->size);
451 }
452
453 static inline int mdt_body_has_lov(const struct lu_attr *la,
454                                    const struct mdt_body *body)
455 {
456         return ((S_ISREG(la->la_mode) && (body->valid & OBD_MD_FLEASIZE)) ||
457                 (S_ISDIR(la->la_mode) && (body->valid & OBD_MD_FLDIREA )) );
458 }
459
460 void mdt_client_compatibility(struct mdt_thread_info *info)
461 {
462         struct mdt_body       *body;
463         struct ptlrpc_request *req = mdt_info_req(info);
464         struct obd_export     *exp = req->rq_export;
465         struct md_attr        *ma = &info->mti_attr;
466         struct lu_attr        *la = &ma->ma_attr;
467         ENTRY;
468
469         if (exp_connect_layout(exp))
470                 /* the client can deal with 16-bit lmm_stripe_count */
471                 RETURN_EXIT;
472
473         body = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
474
475         if (!mdt_body_has_lov(la, body))
476                 RETURN_EXIT;
477
478         /* now we have a reply with a lov for a client not compatible with the
479          * layout lock so we have to clean the layout generation number */
480         if (S_ISREG(la->la_mode))
481                 ma->ma_lmm->lmm_layout_gen = 0;
482         EXIT;
483 }
484
485 int mdt_attr_get_eabuf_size(struct mdt_thread_info *info, struct mdt_object *o)
486 {
487         const struct lu_env *env = info->mti_env;
488         int rc, rc2;
489
490         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
491                           XATTR_NAME_LOV);
492
493         if (rc == -ENODATA)
494                 rc = 0;
495
496         if (rc < 0)
497                 goto out;
498
499         /* Is it a directory? Let's check for the LMV as well */
500         if (S_ISDIR(lu_object_attr(&mdt_object_child(o)->mo_lu))) {
501                 rc2 = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
502                                    XATTR_NAME_LMV);
503                 if ((rc2 < 0 && rc2 != -ENODATA) || (rc2 > rc))
504                         rc = rc2;
505         }
506
507 out:
508         return rc;
509 }
510
511 int mdt_big_xattr_get(struct mdt_thread_info *info, struct mdt_object *o,
512                       const char *name)
513 {
514         const struct lu_env *env = info->mti_env;
515         int rc;
516         ENTRY;
517
518         LASSERT(info->mti_big_lmm_used == 0);
519         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL, name);
520         if (rc < 0)
521                 RETURN(rc);
522
523         /* big_lmm may need to be grown */
524         if (info->mti_big_lmmsize < rc) {
525                 int size = size_roundup_power2(rc);
526
527                 if (info->mti_big_lmmsize > 0) {
528                         /* free old buffer */
529                         LASSERT(info->mti_big_lmm);
530                         OBD_FREE_LARGE(info->mti_big_lmm,
531                                        info->mti_big_lmmsize);
532                         info->mti_big_lmm = NULL;
533                         info->mti_big_lmmsize = 0;
534                 }
535
536                 OBD_ALLOC_LARGE(info->mti_big_lmm, size);
537                 if (info->mti_big_lmm == NULL)
538                         RETURN(-ENOMEM);
539                 info->mti_big_lmmsize = size;
540         }
541         LASSERT(info->mti_big_lmmsize >= rc);
542
543         info->mti_buf.lb_buf = info->mti_big_lmm;
544         info->mti_buf.lb_len = info->mti_big_lmmsize;
545         rc = mo_xattr_get(env, mdt_object_child(o), &info->mti_buf, name);
546
547         RETURN(rc);
548 }
549
550 int mdt_stripe_get(struct mdt_thread_info *info, struct mdt_object *o,
551                    struct md_attr *ma, const char *name)
552 {
553         struct md_object *next = mdt_object_child(o);
554         struct lu_buf    *buf = &info->mti_buf;
555         int rc;
556
557         if (strcmp(name, XATTR_NAME_LOV) == 0) {
558                 buf->lb_buf = ma->ma_lmm;
559                 buf->lb_len = ma->ma_lmm_size;
560                 LASSERT(!(ma->ma_valid & MA_LOV));
561         } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
562                 buf->lb_buf = ma->ma_lmv;
563                 buf->lb_len = ma->ma_lmv_size;
564                 LASSERT(!(ma->ma_valid & MA_LMV));
565         } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
566                 buf->lb_buf = ma->ma_lmv;
567                 buf->lb_len = ma->ma_lmv_size;
568                 LASSERT(!(ma->ma_valid & MA_LMV_DEF));
569         } else {
570                 return -EINVAL;
571         }
572
573         rc = mo_xattr_get(info->mti_env, next, buf, name);
574         if (rc > 0) {
575                 if (strcmp(name, XATTR_NAME_LOV) == 0) {
576                         ma->ma_lmm_size = rc;
577                         ma->ma_valid |= MA_LOV;
578                 } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
579                         ma->ma_lmv_size = rc;
580                         ma->ma_valid |= MA_LMV;
581                 } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
582                         ma->ma_lmv_size = rc;
583                         ma->ma_valid |= MA_LMV_DEF;
584                 }
585
586                 rc = 0;
587         } else if (rc == -ENODATA) {
588                 /* no LOV EA */
589                 rc = 0;
590         } else if (rc == -ERANGE) {
591                 /* Default LMV has fixed size, so it must be able to fit
592                  * in the original buffer */
593                 if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0)
594                         return rc;
595                 rc = mdt_big_xattr_get(info, o, name);
596                 if (rc > 0) {
597                         info->mti_big_lmm_used = 1;
598                         if (!strcmp(name, XATTR_NAME_LOV)) {
599                                 ma->ma_valid |= MA_LOV;
600                                 ma->ma_lmm = info->mti_big_lmm;
601                                 ma->ma_lmm_size = rc;
602                         } else if (!strcmp(name, XATTR_NAME_LMV)) {
603                                 ma->ma_valid |= MA_LMV;
604                                 ma->ma_lmv = info->mti_big_lmm;
605                                 ma->ma_lmv_size = rc;
606                         } else {
607                                 return -EINVAL;
608                         }
609
610                         /* update mdt_max_mdsize so all clients
611                          * will be aware about that */
612                         if (info->mti_mdt->mdt_max_mdsize < rc)
613                                 info->mti_mdt->mdt_max_mdsize = rc;
614                         rc = 0;
615                 }
616         }
617
618         return rc;
619 }
620
621 static int mdt_attr_get_pfid(struct mdt_thread_info *info,
622                              struct mdt_object *o, struct lu_fid *pfid)
623 {
624         struct lu_buf           *buf = &info->mti_buf;
625         struct link_ea_header   *leh;
626         struct link_ea_entry    *lee;
627         int                      rc;
628         ENTRY;
629
630         buf->lb_buf = info->mti_big_lmm;
631         buf->lb_len = info->mti_big_lmmsize;
632         rc = mo_xattr_get(info->mti_env, mdt_object_child(o),
633                           buf, XATTR_NAME_LINK);
634         /* ignore errors, MA_PFID won't be set and it is
635          * up to the caller to treat this as an error */
636         if (rc == -ERANGE || buf->lb_len == 0) {
637                 rc = mdt_big_xattr_get(info, o, XATTR_NAME_LINK);
638                 buf->lb_buf = info->mti_big_lmm;
639                 buf->lb_len = info->mti_big_lmmsize;
640         }
641
642         if (rc < 0)
643                 RETURN(rc);
644         if (rc < sizeof(*leh)) {
645                 CERROR("short LinkEA on "DFID": rc = %d\n",
646                        PFID(mdt_object_fid(o)), rc);
647                 RETURN(-ENODATA);
648         }
649
650         leh = (struct link_ea_header *) buf->lb_buf;
651         lee = (struct link_ea_entry *)(leh + 1);
652         if (leh->leh_magic == __swab32(LINK_EA_MAGIC)) {
653                 leh->leh_magic = LINK_EA_MAGIC;
654                 leh->leh_reccount = __swab32(leh->leh_reccount);
655                 leh->leh_len = __swab64(leh->leh_len);
656         }
657         if (leh->leh_magic != LINK_EA_MAGIC)
658                 RETURN(-EINVAL);
659         if (leh->leh_reccount == 0)
660                 RETURN(-ENODATA);
661
662         memcpy(pfid, &lee->lee_parent_fid, sizeof(*pfid));
663         fid_be_to_cpu(pfid, pfid);
664
665         RETURN(0);
666 }
667
668 int mdt_attr_get_complex(struct mdt_thread_info *info,
669                          struct mdt_object *o, struct md_attr *ma)
670 {
671         const struct lu_env *env = info->mti_env;
672         struct md_object    *next = mdt_object_child(o);
673         struct lu_buf       *buf = &info->mti_buf;
674         u32                  mode = lu_object_attr(&next->mo_lu);
675         int                  need = ma->ma_need;
676         int                  rc = 0, rc2;
677         ENTRY;
678
679         ma->ma_valid = 0;
680
681         if (need & MA_INODE) {
682                 ma->ma_need = MA_INODE;
683                 rc = mo_attr_get(env, next, ma);
684                 if (rc)
685                         GOTO(out, rc);
686                 ma->ma_valid |= MA_INODE;
687         }
688
689         if (need & MA_PFID) {
690                 rc = mdt_attr_get_pfid(info, o, &ma->ma_pfid);
691                 if (rc == 0)
692                         ma->ma_valid |= MA_PFID;
693                 /* ignore this error, parent fid is not mandatory */
694                 rc = 0;
695         }
696
697         if (need & MA_LOV && (S_ISREG(mode) || S_ISDIR(mode))) {
698                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LOV);
699                 if (rc)
700                         GOTO(out, rc);
701         }
702
703         if (need & MA_LMV && S_ISDIR(mode)) {
704                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LMV);
705                 if (rc != 0)
706                         GOTO(out, rc);
707         }
708
709         if (need & MA_LMV_DEF && S_ISDIR(mode)) {
710                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_DEFAULT_LMV);
711                 if (rc != 0)
712                         GOTO(out, rc);
713         }
714
715         if (need & MA_SOM && S_ISREG(mode)) {
716                 buf->lb_buf = info->mti_xattr_buf;
717                 buf->lb_len = sizeof(info->mti_xattr_buf);
718                 CLASSERT(sizeof(struct som_attrs) <=
719                          sizeof(info->mti_xattr_buf));
720                 rc2 = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_SOM);
721                 rc2 = lustre_buf2som(info->mti_xattr_buf, rc2, ma->ma_som);
722                 if (rc2 == 0)
723                         ma->ma_valid |= MA_SOM;
724                 else if (rc2 < 0 && rc2 != -ENODATA)
725                         GOTO(out, rc = rc2);
726         }
727
728         if (need & MA_HSM && S_ISREG(mode)) {
729                 buf->lb_buf = info->mti_xattr_buf;
730                 buf->lb_len = sizeof(info->mti_xattr_buf);
731                 CLASSERT(sizeof(struct hsm_attrs) <=
732                          sizeof(info->mti_xattr_buf));
733                 rc2 = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_HSM);
734                 rc2 = lustre_buf2hsm(info->mti_xattr_buf, rc2, &ma->ma_hsm);
735                 if (rc2 == 0)
736                         ma->ma_valid |= MA_HSM;
737                 else if (rc2 < 0 && rc2 != -ENODATA)
738                         GOTO(out, rc = rc2);
739         }
740
741 #ifdef CONFIG_FS_POSIX_ACL
742         if (need & MA_ACL_DEF && S_ISDIR(mode)) {
743                 buf->lb_buf = ma->ma_acl;
744                 buf->lb_len = ma->ma_acl_size;
745                 rc2 = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_DEFAULT);
746                 if (rc2 > 0) {
747                         ma->ma_acl_size = rc2;
748                         ma->ma_valid |= MA_ACL_DEF;
749                 } else if (rc2 == -ENODATA) {
750                         /* no ACLs */
751                         ma->ma_acl_size = 0;
752                 } else
753                         GOTO(out, rc = rc2);
754         }
755 #endif
756 out:
757         ma->ma_need = need;
758         CDEBUG(D_INODE, "after getattr rc = %d, ma_valid = "LPX64" ma_lmm=%p\n",
759                rc, ma->ma_valid, ma->ma_lmm);
760         RETURN(rc);
761 }
762
763 static int mdt_getattr_internal(struct mdt_thread_info *info,
764                                 struct mdt_object *o, int ma_need)
765 {
766         struct md_object        *next = mdt_object_child(o);
767         const struct mdt_body   *reqbody = info->mti_body;
768         struct ptlrpc_request   *req = mdt_info_req(info);
769         struct md_attr          *ma = &info->mti_attr;
770         struct lu_attr          *la = &ma->ma_attr;
771         struct req_capsule      *pill = info->mti_pill;
772         const struct lu_env     *env = info->mti_env;
773         struct mdt_body         *repbody;
774         struct lu_buf           *buffer = &info->mti_buf;
775         int                     rc;
776         int                     is_root;
777         ENTRY;
778
779         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK))
780                 RETURN(err_serious(-ENOMEM));
781
782         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
783
784         ma->ma_valid = 0;
785
786         if (mdt_object_remote(o)) {
787                 /* This object is located on remote node.*/
788                 /* Return -EIO for old client */
789                 if (!mdt_is_dne_client(req->rq_export))
790                         GOTO(out, rc = -EIO);
791
792                 repbody->fid1 = *mdt_object_fid(o);
793                 repbody->valid = OBD_MD_FLID | OBD_MD_MDS;
794                 GOTO(out, rc = 0);
795         }
796
797         if (reqbody->eadatasize > 0) {
798                 buffer->lb_buf = req_capsule_server_get(pill, &RMF_MDT_MD);
799                 if (buffer->lb_buf == NULL)
800                         GOTO(out, rc = -EPROTO);
801                 buffer->lb_len = req_capsule_get_size(pill, &RMF_MDT_MD,
802                                                       RCL_SERVER);
803         } else {
804                 buffer->lb_buf = NULL;
805                 buffer->lb_len = 0;
806                 ma_need &= ~(MA_LOV | MA_LMV);
807                 CDEBUG(D_INFO, "%s: RPC from %s: does not need LOVEA.\n",
808                        mdt_obd_name(info->mti_mdt),
809                        req->rq_export->exp_client_uuid.uuid);
810         }
811
812         /* If it is dir object and client require MEA, then we got MEA */
813         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
814             (reqbody->valid & (OBD_MD_MEA | OBD_MD_DEFAULT_MEA))) {
815                 /* Assumption: MDT_MD size is enough for lmv size. */
816                 ma->ma_lmv = buffer->lb_buf;
817                 ma->ma_lmv_size = buffer->lb_len;
818                 ma->ma_need = MA_INODE;
819                 if (ma->ma_lmv_size > 0) {
820                         if (reqbody->valid & OBD_MD_MEA)
821                                 ma->ma_need |= MA_LMV;
822                         else if (reqbody->valid & OBD_MD_DEFAULT_MEA)
823                                 ma->ma_need |= MA_LMV_DEF;
824                 }
825         } else {
826                 ma->ma_lmm = buffer->lb_buf;
827                 ma->ma_lmm_size = buffer->lb_len;
828                 ma->ma_need = MA_INODE | MA_HSM;
829                 if (ma->ma_lmm_size > 0)
830                         ma->ma_need |= MA_LOV;
831         }
832
833         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
834             reqbody->valid & OBD_MD_FLDIREA  &&
835             lustre_msg_get_opc(req->rq_reqmsg) == MDS_GETATTR) {
836                 /* get default stripe info for this dir. */
837                 ma->ma_need |= MA_LOV_DEF;
838         }
839         ma->ma_need |= ma_need;
840         if (ma->ma_need & MA_SOM)
841                 ma->ma_som = &info->mti_u.som.data;
842
843         rc = mdt_attr_get_complex(info, o, ma);
844         if (unlikely(rc)) {
845                 CERROR("%s: getattr error for "DFID": rc = %d\n",
846                        mdt_obd_name(info->mti_mdt),
847                        PFID(mdt_object_fid(o)), rc);
848                 RETURN(rc);
849         }
850
851         /* if file is released, check if a restore is running */
852         if ((ma->ma_valid & MA_HSM) && (ma->ma_hsm.mh_flags & HS_RELEASED) &&
853             mdt_hsm_restore_is_running(info, mdt_object_fid(o))) {
854                 repbody->t_state = MS_RESTORE;
855                 repbody->valid |= OBD_MD_TSTATE;
856         }
857
858         is_root = lu_fid_eq(mdt_object_fid(o), &info->mti_mdt->mdt_md_root_fid);
859
860         /* the Lustre protocol supposes to return default striping
861          * on the user-visible root if explicitly requested */
862         if ((ma->ma_valid & MA_LOV) == 0 && S_ISDIR(la->la_mode) &&
863             (ma->ma_need & MA_LOV_DEF && is_root) && ma->ma_need & MA_LOV) {
864                 struct lu_fid      rootfid;
865                 struct mdt_object *root;
866                 struct mdt_device *mdt = info->mti_mdt;
867
868                 rc = dt_root_get(env, mdt->mdt_bottom, &rootfid);
869                 if (rc)
870                         RETURN(rc);
871                 root = mdt_object_find(env, mdt, &rootfid);
872                 if (IS_ERR(root))
873                         RETURN(PTR_ERR(root));
874                 rc = mdt_stripe_get(info, root, ma, XATTR_NAME_LOV);
875                 mdt_object_put(info->mti_env, root);
876                 if (unlikely(rc)) {
877                         CERROR("%s: getattr error for "DFID": rc = %d\n",
878                                mdt_obd_name(info->mti_mdt),
879                                PFID(mdt_object_fid(o)), rc);
880                         RETURN(rc);
881                 }
882         }
883
884         if (likely(ma->ma_valid & MA_INODE))
885                 mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
886         else
887                 RETURN(-EFAULT);
888
889         if (mdt_body_has_lov(la, reqbody)) {
890                 if (ma->ma_valid & MA_LOV) {
891                         LASSERT(ma->ma_lmm_size);
892                         repbody->eadatasize = ma->ma_lmm_size;
893                         if (S_ISDIR(la->la_mode))
894                                 repbody->valid |= OBD_MD_FLDIREA;
895                         else
896                                 repbody->valid |= OBD_MD_FLEASIZE;
897                         mdt_dump_lmm(D_INFO, ma->ma_lmm, repbody->valid);
898                 }
899                 if (ma->ma_valid & MA_LMV) {
900                         LASSERT(S_ISDIR(la->la_mode));
901                         mdt_dump_lmv(D_INFO, ma->ma_lmv);
902                         repbody->eadatasize = ma->ma_lmv_size;
903                         repbody->valid |= (OBD_MD_FLDIREA|OBD_MD_MEA);
904                 }
905                 if (ma->ma_valid & MA_LMV_DEF) {
906                         LASSERT(S_ISDIR(la->la_mode));
907                         repbody->eadatasize = ma->ma_lmv_size;
908                         repbody->valid |= (OBD_MD_FLDIREA|OBD_MD_DEFAULT_MEA);
909                 }
910         } else if (S_ISLNK(la->la_mode) &&
911                    reqbody->valid & OBD_MD_LINKNAME) {
912                 buffer->lb_buf = ma->ma_lmm;
913                 /* eadatasize from client includes NULL-terminator, so
914                  * there is no need to read it */
915                 buffer->lb_len = reqbody->eadatasize - 1;
916                 rc = mo_readlink(env, next, buffer);
917                 if (unlikely(rc <= 0)) {
918                         CERROR("%s: readlink failed for "DFID": rc = %d\n",
919                                mdt_obd_name(info->mti_mdt),
920                                PFID(mdt_object_fid(o)), rc);
921                         rc = -EFAULT;
922                 } else {
923                         int print_limit = min_t(int, PAGE_CACHE_SIZE - 128, rc);
924
925                         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READLINK_EPROTO))
926                                 rc -= 2;
927                         repbody->valid |= OBD_MD_LINKNAME;
928                         /* we need to report back size with NULL-terminator
929                          * because client expects that */
930                         repbody->eadatasize = rc + 1;
931                         if (repbody->eadatasize != reqbody->eadatasize)
932                                 CDEBUG(D_INODE, "%s: Read shorter symlink %d "
933                                        "on "DFID ", expected %d\n",
934                                        mdt_obd_name(info->mti_mdt),
935                                        rc, PFID(mdt_object_fid(o)),
936                                        reqbody->eadatasize - 1);
937                         /* NULL terminate */
938                         ((char *)ma->ma_lmm)[rc] = 0;
939
940                         /* If the total CDEBUG() size is larger than a page, it
941                          * will print a warning to the console, avoid this by
942                          * printing just the last part of the symlink. */
943                         CDEBUG(D_INODE, "symlink dest %s%.*s, len = %d\n",
944                                print_limit < rc ? "..." : "", print_limit,
945                                (char *)ma->ma_lmm + rc - print_limit, rc);
946                         rc = 0;
947                 }
948         }
949
950         if (reqbody->valid & OBD_MD_FLMODEASIZE) {
951                 repbody->max_cookiesize = 0;
952                 repbody->max_mdsize = info->mti_mdt->mdt_max_mdsize;
953                 repbody->valid |= OBD_MD_FLMODEASIZE;
954                 CDEBUG(D_INODE, "I am going to change the MAX_MD_SIZE & "
955                        "MAX_COOKIE to : %d:%d\n", repbody->max_mdsize,
956                        repbody->max_cookiesize);
957         }
958
959         if (exp_connect_rmtclient(info->mti_exp) &&
960             reqbody->valid & OBD_MD_FLRMTPERM) {
961                 void *buf = req_capsule_server_get(pill, &RMF_ACL);
962
963                 /* mdt_getattr_lock only */
964                 rc = mdt_pack_remote_perm(info, o, buf);
965                 if (rc) {
966                         repbody->valid &= ~OBD_MD_FLRMTPERM;
967                         repbody->aclsize = 0;
968                         RETURN(rc);
969                 } else {
970                         repbody->valid |= OBD_MD_FLRMTPERM;
971                         repbody->aclsize = sizeof(struct mdt_remote_perm);
972                 }
973         }
974 #ifdef CONFIG_FS_POSIX_ACL
975         else if ((exp_connect_flags(req->rq_export) & OBD_CONNECT_ACL) &&
976                  (reqbody->valid & OBD_MD_FLACL)) {
977                 buffer->lb_buf = req_capsule_server_get(pill, &RMF_ACL);
978                 buffer->lb_len = req_capsule_get_size(pill,
979                                                       &RMF_ACL, RCL_SERVER);
980                 if (buffer->lb_len > 0) {
981                         rc = mo_xattr_get(env, next, buffer,
982                                           XATTR_NAME_ACL_ACCESS);
983                         if (rc < 0) {
984                                 if (rc == -ENODATA) {
985                                         repbody->aclsize = 0;
986                                         repbody->valid |= OBD_MD_FLACL;
987                                         rc = 0;
988                                 } else if (rc == -EOPNOTSUPP) {
989                                         rc = 0;
990                                 } else {
991                                         CERROR("%s: unable to read "DFID
992                                                " ACL: rc = %d\n",
993                                                mdt_obd_name(info->mti_mdt),
994                                                PFID(mdt_object_fid(o)), rc);
995                                 }
996                         } else {
997                                 repbody->aclsize = rc;
998                                 repbody->valid |= OBD_MD_FLACL;
999                                 rc = 0;
1000                         }
1001                 }
1002         }
1003 #endif
1004
1005         if (reqbody->valid & OBD_MD_FLMDSCAPA &&
1006             info->mti_mdt->mdt_lut.lut_mds_capa &&
1007             exp_connect_flags(info->mti_exp) & OBD_CONNECT_MDS_CAPA) {
1008                 struct lustre_capa *capa;
1009
1010                 capa = req_capsule_server_get(pill, &RMF_CAPA1);
1011                 LASSERT(capa);
1012                 capa->lc_opc = CAPA_OPC_MDS_DEFAULT;
1013                 rc = mo_capa_get(env, next, capa, 0);
1014                 if (rc)
1015                         RETURN(rc);
1016                 repbody->valid |= OBD_MD_FLMDSCAPA;
1017         }
1018
1019 out:
1020         if (rc == 0)
1021                 mdt_counter_incr(req, LPROC_MDT_GETATTR);
1022
1023         RETURN(rc);
1024 }
1025
1026 static int mdt_renew_capa(struct mdt_thread_info *info)
1027 {
1028         struct mdt_object  *obj = info->mti_object;
1029         struct mdt_body    *body;
1030         struct lustre_capa *capa, *c;
1031         int rc;
1032         ENTRY;
1033
1034         /* if object doesn't exist, or server has disabled capability,
1035          * return directly, client will find body->valid OBD_MD_FLOSSCAPA
1036          * flag not set.
1037          */
1038         if (!obj || !info->mti_mdt->mdt_lut.lut_oss_capa ||
1039             !(exp_connect_flags(info->mti_exp) & OBD_CONNECT_OSS_CAPA))
1040                 RETURN(0);
1041
1042         body = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1043         LASSERT(body != NULL);
1044
1045         c = req_capsule_client_get(info->mti_pill, &RMF_CAPA1);
1046         LASSERT(c);
1047
1048         capa = req_capsule_server_get(info->mti_pill, &RMF_CAPA2);
1049         LASSERT(capa);
1050
1051         *capa = *c;
1052         rc = mo_capa_get(info->mti_env, mdt_object_child(obj), capa, 1);
1053         if (rc == 0)
1054                 body->valid |= OBD_MD_FLOSSCAPA;
1055         RETURN(rc);
1056 }
1057
1058 static int mdt_getattr(struct tgt_session_info *tsi)
1059 {
1060         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1061         struct mdt_object       *obj = info->mti_object;
1062         struct req_capsule      *pill = info->mti_pill;
1063         struct mdt_body         *reqbody;
1064         struct mdt_body         *repbody;
1065         int rc, rc2;
1066         ENTRY;
1067
1068         reqbody = req_capsule_client_get(pill, &RMF_MDT_BODY);
1069         LASSERT(reqbody);
1070
1071         if (reqbody->valid & OBD_MD_FLOSSCAPA) {
1072                 rc = req_capsule_server_pack(pill);
1073                 if (unlikely(rc))
1074                         RETURN(err_serious(rc));
1075                 rc = mdt_renew_capa(info);
1076                 GOTO(out_shrink, rc);
1077         }
1078
1079         LASSERT(obj != NULL);
1080         LASSERT(lu_object_assert_exists(&obj->mot_obj));
1081
1082         /* Unlike intent case where we need to pre-fill out buffers early on
1083          * in intent policy for ldlm reasons, here we can have a much better
1084          * guess at EA size by just reading it from disk.
1085          * Exceptions are readdir and (missing) directory striping */
1086         /* Readlink */
1087         if (reqbody->valid & OBD_MD_LINKNAME) {
1088                 /* No easy way to know how long is the symlink, but it cannot
1089                  * be more than PATH_MAX, so we allocate +1 */
1090                 rc = PATH_MAX + 1;
1091
1092         /* A special case for fs ROOT: getattr there might fetch
1093          * default EA for entire fs, not just for this dir!
1094          */
1095         } else if (lu_fid_eq(mdt_object_fid(obj),
1096                              &info->mti_mdt->mdt_md_root_fid) &&
1097                    (reqbody->valid & OBD_MD_FLDIREA) &&
1098                    (lustre_msg_get_opc(mdt_info_req(info)->rq_reqmsg) ==
1099                                                                  MDS_GETATTR)) {
1100                 /* Should the default strping be bigger, mdt_fix_reply
1101                  * will reallocate */
1102                 rc = DEF_REP_MD_SIZE;
1103         } else {
1104                 /* Read the actual EA size from disk */
1105                 rc = mdt_attr_get_eabuf_size(info, obj);
1106         }
1107
1108         if (rc < 0)
1109                 GOTO(out_shrink, rc);
1110
1111         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, rc);
1112
1113         rc = req_capsule_server_pack(pill);
1114         if (unlikely(rc != 0))
1115                 GOTO(out, rc = err_serious(rc));
1116
1117         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1118         LASSERT(repbody != NULL);
1119         repbody->eadatasize = 0;
1120         repbody->aclsize = 0;
1121
1122         if (reqbody->valid & OBD_MD_FLRMTPERM)
1123                 rc = mdt_init_ucred(info, reqbody);
1124         else
1125                 rc = mdt_check_ucred(info);
1126         if (unlikely(rc))
1127                 GOTO(out_shrink, rc);
1128
1129         info->mti_cross_ref = !!(reqbody->valid & OBD_MD_FLCROSSREF);
1130
1131         /*
1132          * Don't check capability at all, because rename might getattr for
1133          * remote obj, and at that time no capability is available.
1134          */
1135         mdt_set_capainfo(info, 1, &reqbody->fid1, BYPASS_CAPA);
1136         rc = mdt_getattr_internal(info, obj, 0);
1137         if (reqbody->valid & OBD_MD_FLRMTPERM)
1138                 mdt_exit_ucred(info);
1139         EXIT;
1140 out_shrink:
1141         mdt_client_compatibility(info);
1142         rc2 = mdt_fix_reply(info);
1143         if (rc == 0)
1144                 rc = rc2;
1145 out:
1146         mdt_thread_info_fini(info);
1147         return rc;
1148 }
1149
1150 static int mdt_is_subdir(struct tgt_session_info *tsi)
1151 {
1152         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1153         struct mdt_object     *o = info->mti_object;
1154         struct req_capsule    *pill = info->mti_pill;
1155         const struct mdt_body *body = info->mti_body;
1156         struct mdt_body       *repbody;
1157         int                    rc;
1158         ENTRY;
1159
1160         LASSERT(o != NULL);
1161
1162         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1163
1164         /*
1165          * We save last checked parent fid to @repbody->fid1 for remote
1166          * directory case.
1167          */
1168         LASSERT(fid_is_sane(&body->fid2));
1169         LASSERT(mdt_object_exists(o) && !mdt_object_remote(o));
1170         rc = mdo_is_subdir(info->mti_env, mdt_object_child(o),
1171                            &body->fid2, &repbody->fid1);
1172         if (rc == 0 || rc == -EREMOTE)
1173                 repbody->valid |= OBD_MD_FLID;
1174
1175         mdt_thread_info_fini(info);
1176         RETURN(rc);
1177 }
1178
1179 static int mdt_swap_layouts(struct tgt_session_info *tsi)
1180 {
1181         struct mdt_thread_info  *info;
1182         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1183         struct obd_export       *exp = req->rq_export;
1184         struct mdt_object       *o1, *o2, *o;
1185         struct mdt_lock_handle  *lh1, *lh2;
1186         struct mdc_swap_layouts *msl;
1187         int                      rc;
1188         ENTRY;
1189
1190         /* client does not support layout lock, so layout swaping
1191          * is disabled.
1192          * FIXME: there is a problem for old clients which don't support
1193          * layout lock yet. If those clients have already opened the file
1194          * they won't be notified at all so that old layout may still be
1195          * used to do IO. This can be fixed after file release is landed by
1196          * doing exclusive open and taking full EX ibits lock. - Jinshan */
1197         if (!exp_connect_layout(exp))
1198                 RETURN(-EOPNOTSUPP);
1199
1200         info = tsi2mdt_info(tsi);
1201
1202         if (info->mti_dlm_req != NULL)
1203                 ldlm_request_cancel(req, info->mti_dlm_req, 0);
1204
1205         if (req_capsule_get_size(info->mti_pill, &RMF_CAPA1, RCL_CLIENT))
1206                 mdt_set_capainfo(info, 0, &info->mti_body->fid1,
1207                                  req_capsule_client_get(info->mti_pill,
1208                                                         &RMF_CAPA1));
1209
1210         if (req_capsule_get_size(info->mti_pill, &RMF_CAPA2, RCL_CLIENT))
1211                 mdt_set_capainfo(info, 1, &info->mti_body->fid2,
1212                                  req_capsule_client_get(info->mti_pill,
1213                                                         &RMF_CAPA2));
1214
1215         o1 = info->mti_object;
1216         o = o2 = mdt_object_find(info->mti_env, info->mti_mdt,
1217                                 &info->mti_body->fid2);
1218         if (IS_ERR(o))
1219                 GOTO(out, rc = PTR_ERR(o));
1220
1221         if (mdt_object_remote(o) || !mdt_object_exists(o)) /* remote object */
1222                 GOTO(put, rc = -ENOENT);
1223
1224         rc = lu_fid_cmp(&info->mti_body->fid1, &info->mti_body->fid2);
1225         if (unlikely(rc == 0)) /* same file, you kidding me? no-op. */
1226                 GOTO(put, rc);
1227
1228         if (rc < 0)
1229                 swap(o1, o2);
1230
1231         /* permission check. Make sure the calling process having permission
1232          * to write both files. */
1233         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o1), NULL,
1234                                 MAY_WRITE);
1235         if (rc < 0)
1236                 GOTO(put, rc);
1237
1238         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o2), NULL,
1239                                 MAY_WRITE);
1240         if (rc < 0)
1241                 GOTO(put, rc);
1242
1243         msl = req_capsule_client_get(info->mti_pill, &RMF_SWAP_LAYOUTS);
1244         if (msl == NULL)
1245                 GOTO(put, rc = -EPROTO);
1246
1247         lh1 = &info->mti_lh[MDT_LH_NEW];
1248         mdt_lock_reg_init(lh1, LCK_EX);
1249         lh2 = &info->mti_lh[MDT_LH_OLD];
1250         mdt_lock_reg_init(lh2, LCK_EX);
1251
1252         rc = mdt_object_lock(info, o1, lh1, MDS_INODELOCK_LAYOUT |
1253                              MDS_INODELOCK_XATTR, MDT_LOCAL_LOCK);
1254         if (rc < 0)
1255                 GOTO(put, rc);
1256
1257         rc = mdt_object_lock(info, o2, lh2, MDS_INODELOCK_LAYOUT |
1258                              MDS_INODELOCK_XATTR, MDT_LOCAL_LOCK);
1259         if (rc < 0)
1260                 GOTO(unlock1, rc);
1261
1262         rc = mo_swap_layouts(info->mti_env, mdt_object_child(o1),
1263                              mdt_object_child(o2), msl->msl_flags);
1264         GOTO(unlock2, rc);
1265 unlock2:
1266         mdt_object_unlock(info, o2, lh2, rc);
1267 unlock1:
1268         mdt_object_unlock(info, o1, lh1, rc);
1269 put:
1270         mdt_object_put(info->mti_env, o);
1271 out:
1272         mdt_thread_info_fini(info);
1273         RETURN(rc);
1274 }
1275
1276 static int mdt_raw_lookup(struct mdt_thread_info *info,
1277                           struct mdt_object *parent,
1278                           const struct lu_name *lname,
1279                           struct ldlm_reply *ldlm_rep)
1280 {
1281         struct md_object *next = mdt_object_child(info->mti_object);
1282         const struct mdt_body *reqbody = info->mti_body;
1283         struct lu_fid *child_fid = &info->mti_tmp_fid1;
1284         struct mdt_body *repbody;
1285         int rc;
1286         ENTRY;
1287
1288         if (reqbody->valid != OBD_MD_FLID)
1289                 RETURN(0);
1290
1291         LASSERT(!info->mti_cross_ref);
1292
1293         /* Only got the fid of this obj by name */
1294         fid_zero(child_fid);
1295         rc = mdo_lookup(info->mti_env, next, lname, child_fid,
1296                         &info->mti_spec);
1297 #if 0
1298         /* XXX is raw_lookup possible as intent operation? */
1299         if (rc != 0) {
1300                 if (rc == -ENOENT)
1301                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1302                 RETURN(rc);
1303         } else
1304                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1305
1306         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1307 #endif
1308         if (rc == 0) {
1309                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1310                 repbody->fid1 = *child_fid;
1311                 repbody->valid = OBD_MD_FLID;
1312         }
1313         RETURN(1);
1314 }
1315
1316 /*
1317  * UPDATE lock should be taken against parent, and be release before exit;
1318  * child_bits lock should be taken against child, and be returned back:
1319  *            (1)normal request should release the child lock;
1320  *            (2)intent request will grant the lock to client.
1321  */
1322 static int mdt_getattr_name_lock(struct mdt_thread_info *info,
1323                                  struct mdt_lock_handle *lhc,
1324                                  __u64 child_bits,
1325                                  struct ldlm_reply *ldlm_rep)
1326 {
1327         struct ptlrpc_request  *req       = mdt_info_req(info);
1328         struct mdt_body        *reqbody   = NULL;
1329         struct mdt_object      *parent    = info->mti_object;
1330         struct mdt_object      *child;
1331         struct md_object       *next      = mdt_object_child(parent);
1332         struct lu_fid          *child_fid = &info->mti_tmp_fid1;
1333         struct lu_name         *lname     = NULL;
1334         struct mdt_lock_handle *lhp       = NULL;
1335         struct ldlm_lock       *lock;
1336         bool                    is_resent;
1337         bool                    try_layout;
1338         int                     ma_need = 0;
1339         int                     rc;
1340         ENTRY;
1341
1342         is_resent = lustre_handle_is_used(&lhc->mlh_reg_lh);
1343         LASSERT(ergo(is_resent,
1344                      lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT));
1345
1346         LASSERT(parent != NULL);
1347
1348         if (info->mti_cross_ref) {
1349                 /* Only getattr on the child. Parent is on another node. */
1350                 mdt_set_disposition(info, ldlm_rep,
1351                                     DISP_LOOKUP_EXECD | DISP_LOOKUP_POS);
1352                 child = parent;
1353                 CDEBUG(D_INODE, "partial getattr_name child_fid = "DFID", "
1354                        "ldlm_rep = %p\n",
1355                        PFID(mdt_object_fid(child)), ldlm_rep);
1356
1357                 if (is_resent) {
1358                         /* Do not take lock for resent case. */
1359                         lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1360                         LASSERTF(lock != NULL, "Invalid lock handle "LPX64"\n",
1361                                  lhc->mlh_reg_lh.cookie);
1362                         LASSERT(fid_res_name_eq(mdt_object_fid(child),
1363                                                 &lock->l_resource->lr_name));
1364                         LDLM_LOCK_PUT(lock);
1365                 } else {
1366                         mdt_lock_handle_init(lhc);
1367                         mdt_lock_reg_init(lhc, LCK_PR);
1368
1369                         /*
1370                          * Object's name is on another MDS, no lookup or layout
1371                          * lock is needed here but update lock is.
1372                          */
1373                         child_bits &= ~(MDS_INODELOCK_LOOKUP |
1374                                         MDS_INODELOCK_LAYOUT);
1375                         child_bits |= MDS_INODELOCK_PERM | MDS_INODELOCK_UPDATE;
1376
1377                         rc = mdt_object_lock(info, child, lhc, child_bits,
1378                                              MDT_LOCAL_LOCK);
1379                         if (rc < 0)
1380                                 RETURN(rc);
1381                 }
1382
1383                 /* Finally, we can get attr for child. */
1384                 if (!mdt_object_exists(child)) {
1385                         LU_OBJECT_DEBUG(D_INFO, info->mti_env,
1386                                         &child->mot_obj,
1387                                         "remote object doesn't exist.\n");
1388                         mdt_object_unlock(info, child, lhc, 1);
1389                         RETURN(-ENOENT);
1390                 }
1391
1392                 mdt_set_capainfo(info, 0, mdt_object_fid(child), BYPASS_CAPA);
1393                 rc = mdt_getattr_internal(info, child, 0);
1394                 if (unlikely(rc != 0))
1395                         mdt_object_unlock(info, child, lhc, 1);
1396
1397                 RETURN(rc);
1398         }
1399
1400         lname = &info->mti_name;
1401         mdt_name_unpack(info->mti_pill, &RMF_NAME, lname, MNF_FIX_ANON);
1402
1403         if (lu_name_is_valid(lname)) {
1404                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DNAME", "
1405                        "ldlm_rep = %p\n", PFID(mdt_object_fid(parent)),
1406                        PNAME(lname), ldlm_rep);
1407         } else {
1408                 reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1409                 if (unlikely(reqbody == NULL))
1410                         RETURN(err_serious(-EPROTO));
1411
1412                 *child_fid = reqbody->fid2;
1413
1414                 if (unlikely(!fid_is_sane(child_fid)))
1415                         RETURN(err_serious(-EINVAL));
1416
1417                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DFID", "
1418                        "ldlm_rep = %p\n",
1419                        PFID(mdt_object_fid(parent)),
1420                        PFID(&reqbody->fid2), ldlm_rep);
1421         }
1422
1423         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_EXECD);
1424
1425         if (unlikely(!mdt_object_exists(parent)) && lu_name_is_valid(lname)) {
1426                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1427                                 &parent->mot_obj,
1428                                 "Parent doesn't exist!\n");
1429                 RETURN(-ESTALE);
1430         }
1431
1432         if (mdt_object_remote(parent)) {
1433                 CERROR("%s: parent "DFID" is on remote target\n",
1434                        mdt_obd_name(info->mti_mdt),
1435                        PFID(mdt_object_fid(parent)));
1436                 RETURN(-EIO);
1437         }
1438
1439         if (lu_name_is_valid(lname)) {
1440                 rc = mdt_raw_lookup(info, parent, lname, ldlm_rep);
1441                 if (rc != 0) {
1442                         if (rc > 0)
1443                                 rc = 0;
1444                         RETURN(rc);
1445                 }
1446
1447                 /* step 1: lock parent only if parent is a directory */
1448                 if (S_ISDIR(lu_object_attr(&parent->mot_obj))) {
1449                         lhp = &info->mti_lh[MDT_LH_PARENT];
1450                         mdt_lock_pdo_init(lhp, LCK_PR, lname);
1451                         rc = mdt_object_lock(info, parent, lhp,
1452                                              MDS_INODELOCK_UPDATE,
1453                                              MDT_LOCAL_LOCK);
1454                         if (unlikely(rc != 0))
1455                                 RETURN(rc);
1456                 }
1457
1458                 /* step 2: lookup child's fid by name */
1459                 fid_zero(child_fid);
1460                 rc = mdo_lookup(info->mti_env, next, lname, child_fid,
1461                                 &info->mti_spec);
1462                 if (rc == -ENOENT)
1463                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1464
1465                 if (rc != 0)
1466                         GOTO(out_parent, rc);
1467         }
1468
1469         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1470
1471         /*
1472          *step 3: find the child object by fid & lock it.
1473          *        regardless if it is local or remote.
1474          *
1475          *Note: LU-3240 (commit 762f2114d282a98ebfa4dbbeea9298a8088ad24e)
1476          *      set parent dir fid the same as child fid in getattr by fid case
1477          *      we should not lu_object_find() the object again, could lead
1478          *      to hung if there is a concurrent unlink destroyed the object.
1479          */
1480         if (lu_fid_eq(mdt_object_fid(parent), child_fid)) {
1481                 mdt_object_get(info->mti_env, parent);
1482                 child = parent;
1483         } else {
1484                 child = mdt_object_find(info->mti_env, info->mti_mdt,
1485                                         child_fid);
1486         }
1487
1488         if (unlikely(IS_ERR(child)))
1489                 GOTO(out_parent, rc = PTR_ERR(child));
1490         if (is_resent) {
1491                 /* Do not take lock for resent case. */
1492                 lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1493                 LASSERTF(lock != NULL, "Invalid lock handle "LPX64"\n",
1494                          lhc->mlh_reg_lh.cookie);
1495
1496                 if (!fid_res_name_eq(mdt_object_fid(child),
1497                                      &lock->l_resource->lr_name)) {
1498                         LASSERTF(fid_res_name_eq(mdt_object_fid(parent),
1499                                                  &lock->l_resource->lr_name),
1500                                  "Lock res_id: "DLDLMRES", fid: "DFID"\n",
1501                                  PLDLMRES(lock->l_resource),
1502                                  PFID(mdt_object_fid(parent)));
1503                         CWARN("Although resent, but still not get child lock"
1504                               "parent:"DFID" child:"DFID"\n",
1505                               PFID(mdt_object_fid(parent)),
1506                               PFID(mdt_object_fid(child)));
1507                         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
1508                         LDLM_LOCK_PUT(lock);
1509                         GOTO(relock, 0);
1510                 }
1511                 LDLM_LOCK_PUT(lock);
1512         } else {
1513 relock:
1514                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RESEND, obd_timeout*2);
1515                 mdt_lock_handle_init(lhc);
1516                 mdt_lock_reg_init(lhc, LCK_PR);
1517                 try_layout = false;
1518
1519                 if (!mdt_object_exists(child)) {
1520                         LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1521                                         &child->mot_obj,
1522                                         "Object doesn't exist!\n");
1523                         GOTO(out_child, rc = -ENOENT);
1524                 }
1525
1526                 if (!(child_bits & MDS_INODELOCK_UPDATE) &&
1527                       mdt_object_exists(child) && !mdt_object_remote(child)) {
1528                         struct md_attr *ma = &info->mti_attr;
1529
1530                         ma->ma_valid = 0;
1531                         ma->ma_need = MA_INODE;
1532                         rc = mdt_attr_get_complex(info, child, ma);
1533                         if (unlikely(rc != 0))
1534                                 GOTO(out_child, rc);
1535
1536                         /* If the file has not been changed for some time, we
1537                          * return not only a LOOKUP lock, but also an UPDATE
1538                          * lock and this might save us RPC on later STAT. For
1539                          * directories, it also let negative dentry cache start
1540                          * working for this dir. */
1541                         if (ma->ma_valid & MA_INODE &&
1542                             ma->ma_attr.la_valid & LA_CTIME &&
1543                             info->mti_mdt->mdt_namespace->ns_ctime_age_limit +
1544                                 ma->ma_attr.la_ctime < cfs_time_current_sec())
1545                                 child_bits |= MDS_INODELOCK_UPDATE;
1546                 }
1547
1548                 /* layout lock must be granted in a best-effort way
1549                  * for IT operations */
1550                 LASSERT(!(child_bits & MDS_INODELOCK_LAYOUT));
1551                 if (!OBD_FAIL_CHECK(OBD_FAIL_MDS_NO_LL_GETATTR) &&
1552                     exp_connect_layout(info->mti_exp) &&
1553                     S_ISREG(lu_object_attr(&child->mot_obj)) &&
1554                     !mdt_object_remote(child) && ldlm_rep != NULL) {
1555                         /* try to grant layout lock for regular file. */
1556                         try_layout = true;
1557                 }
1558
1559                 rc = 0;
1560                 if (try_layout) {
1561                         child_bits |= MDS_INODELOCK_LAYOUT;
1562                         /* try layout lock, it may fail to be granted due to
1563                          * contention at LOOKUP or UPDATE */
1564                         if (!mdt_object_lock_try(info, child, lhc, child_bits,
1565                                                  MDT_CROSS_LOCK)) {
1566                                 child_bits &= ~MDS_INODELOCK_LAYOUT;
1567                                 LASSERT(child_bits != 0);
1568                                 rc = mdt_object_lock(info, child, lhc,
1569                                                 child_bits, MDT_CROSS_LOCK);
1570                         } else {
1571                                 ma_need |= MA_LOV;
1572                         }
1573                 } else {
1574                         /* Do not enqueue the UPDATE lock from MDT(cross-MDT),
1575                          * client will enqueue the lock to the remote MDT */
1576                         if (mdt_object_remote(child))
1577                                 child_bits &= ~MDS_INODELOCK_UPDATE;
1578                         rc = mdt_object_lock(info, child, lhc, child_bits,
1579                                                 MDT_CROSS_LOCK);
1580                 }
1581                 if (unlikely(rc != 0))
1582                         GOTO(out_child, rc);
1583         }
1584
1585         lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1586         /* Get MA_SOM attributes if update lock is given. */
1587         if (lock &&
1588             lock->l_policy_data.l_inodebits.bits & MDS_INODELOCK_UPDATE &&
1589             S_ISREG(lu_object_attr(&mdt_object_child(child)->mo_lu)))
1590                 ma_need |= MA_SOM;
1591
1592         /* finally, we can get attr for child. */
1593         mdt_set_capainfo(info, 1, child_fid, BYPASS_CAPA);
1594         rc = mdt_getattr_internal(info, child, ma_need);
1595         if (unlikely(rc != 0)) {
1596                 mdt_object_unlock(info, child, lhc, 1);
1597         } else if (lock) {
1598                 /* Debugging code. */
1599                 LDLM_DEBUG(lock, "Returning lock to client");
1600                 LASSERTF(fid_res_name_eq(mdt_object_fid(child),
1601                                          &lock->l_resource->lr_name),
1602                          "Lock res_id: "DLDLMRES", fid: "DFID"\n",
1603                          PLDLMRES(lock->l_resource),
1604                          PFID(mdt_object_fid(child)));
1605                 if (mdt_object_exists(child) && !mdt_object_remote(child))
1606                         mdt_pack_size2body(info, child);
1607         }
1608         if (lock)
1609                 LDLM_LOCK_PUT(lock);
1610
1611         EXIT;
1612 out_child:
1613         mdt_object_put(info->mti_env, child);
1614 out_parent:
1615         if (lhp)
1616                 mdt_object_unlock(info, parent, lhp, 1);
1617         return rc;
1618 }
1619
1620 /* normal handler: should release the child lock */
1621 static int mdt_getattr_name(struct tgt_session_info *tsi)
1622 {
1623         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1624         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_CHILD];
1625         struct mdt_body        *reqbody;
1626         struct mdt_body        *repbody;
1627         int rc, rc2;
1628         ENTRY;
1629
1630         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1631         LASSERT(reqbody != NULL);
1632         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1633         LASSERT(repbody != NULL);
1634
1635         info->mti_cross_ref = !!(reqbody->valid & OBD_MD_FLCROSSREF);
1636         repbody->eadatasize = 0;
1637         repbody->aclsize = 0;
1638
1639         rc = mdt_init_ucred(info, reqbody);
1640         if (unlikely(rc))
1641                 GOTO(out_shrink, rc);
1642
1643         rc = mdt_getattr_name_lock(info, lhc, MDS_INODELOCK_UPDATE, NULL);
1644         if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
1645                 ldlm_lock_decref(&lhc->mlh_reg_lh, lhc->mlh_reg_mode);
1646                 lhc->mlh_reg_lh.cookie = 0;
1647         }
1648         mdt_exit_ucred(info);
1649         EXIT;
1650 out_shrink:
1651         mdt_client_compatibility(info);
1652         rc2 = mdt_fix_reply(info);
1653         if (rc == 0)
1654                 rc = rc2;
1655         mdt_thread_info_fini(info);
1656         return rc;
1657 }
1658
1659 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1660                          void *karg, void *uarg);
1661
1662 static int mdt_set_info(struct tgt_session_info *tsi)
1663 {
1664         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1665         char                    *key;
1666         void                    *val;
1667         int                      keylen, vallen, rc = 0;
1668
1669         ENTRY;
1670
1671         key = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_KEY);
1672         if (key == NULL) {
1673                 DEBUG_REQ(D_HA, req, "no set_info key");
1674                 RETURN(err_serious(-EFAULT));
1675         }
1676
1677         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_KEY,
1678                                       RCL_CLIENT);
1679
1680         val = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_VAL);
1681         if (val == NULL) {
1682                 DEBUG_REQ(D_HA, req, "no set_info val");
1683                 RETURN(err_serious(-EFAULT));
1684         }
1685
1686         vallen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_VAL,
1687                                       RCL_CLIENT);
1688
1689         /* Swab any part of val you need to here */
1690         if (KEY_IS(KEY_READ_ONLY)) {
1691                 spin_lock(&req->rq_export->exp_lock);
1692                 if (*(__u32 *)val)
1693                         *exp_connect_flags_ptr(req->rq_export) |=
1694                                 OBD_CONNECT_RDONLY;
1695                 else
1696                         *exp_connect_flags_ptr(req->rq_export) &=
1697                                 ~OBD_CONNECT_RDONLY;
1698                 spin_unlock(&req->rq_export->exp_lock);
1699         } else if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
1700                 struct changelog_setinfo *cs = val;
1701
1702                 if (vallen != sizeof(*cs)) {
1703                         CERROR("%s: bad changelog_clear setinfo size %d\n",
1704                                tgt_name(tsi->tsi_tgt), vallen);
1705                         RETURN(-EINVAL);
1706                 }
1707                 if (ptlrpc_req_need_swab(req)) {
1708                         __swab64s(&cs->cs_recno);
1709                         __swab32s(&cs->cs_id);
1710                 }
1711
1712                 rc = mdt_iocontrol(OBD_IOC_CHANGELOG_CLEAR, req->rq_export,
1713                                    vallen, val, NULL);
1714         } else {
1715                 RETURN(-EINVAL);
1716         }
1717         RETURN(rc);
1718 }
1719
1720 static int mdt_readpage(struct tgt_session_info *tsi)
1721 {
1722         struct mdt_thread_info  *info = mdt_th_info(tsi->tsi_env);
1723         struct mdt_object       *object = mdt_obj(tsi->tsi_corpus);
1724         struct lu_rdpg          *rdpg = &info->mti_u.rdpg.mti_rdpg;
1725         const struct mdt_body   *reqbody = tsi->tsi_mdt_body;
1726         struct mdt_body         *repbody;
1727         int                      rc;
1728         int                      i;
1729
1730         ENTRY;
1731
1732         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK))
1733                 RETURN(err_serious(-ENOMEM));
1734
1735         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_MDT_BODY);
1736         if (repbody == NULL || reqbody == NULL)
1737                 RETURN(err_serious(-EFAULT));
1738
1739         /*
1740          * prepare @rdpg before calling lower layers and transfer itself. Here
1741          * reqbody->size contains offset of where to start to read and
1742          * reqbody->nlink contains number bytes to read.
1743          */
1744         rdpg->rp_hash = reqbody->size;
1745         if (rdpg->rp_hash != reqbody->size) {
1746                 CERROR("Invalid hash: "LPX64" != "LPX64"\n",
1747                        rdpg->rp_hash, reqbody->size);
1748                 RETURN(-EFAULT);
1749         }
1750
1751         rdpg->rp_attrs = reqbody->mode;
1752         if (exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_64BITHASH)
1753                 rdpg->rp_attrs |= LUDA_64BITHASH;
1754         rdpg->rp_count  = min_t(unsigned int, reqbody->nlink,
1755                                 exp_max_brw_size(tsi->tsi_exp));
1756         rdpg->rp_npages = (rdpg->rp_count + PAGE_CACHE_SIZE - 1) >>
1757                           PAGE_CACHE_SHIFT;
1758         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1759         if (rdpg->rp_pages == NULL)
1760                 RETURN(-ENOMEM);
1761
1762         for (i = 0; i < rdpg->rp_npages; ++i) {
1763                 rdpg->rp_pages[i] = alloc_page(GFP_IOFS);
1764                 if (rdpg->rp_pages[i] == NULL)
1765                         GOTO(free_rdpg, rc = -ENOMEM);
1766         }
1767
1768         /* call lower layers to fill allocated pages with directory data */
1769         rc = mo_readpage(tsi->tsi_env, mdt_object_child(object), rdpg);
1770         if (rc < 0)
1771                 GOTO(free_rdpg, rc);
1772
1773         /* send pages to client */
1774         rc = tgt_sendpage(tsi, rdpg, rc);
1775
1776         EXIT;
1777 free_rdpg:
1778
1779         for (i = 0; i < rdpg->rp_npages; i++)
1780                 if (rdpg->rp_pages[i] != NULL)
1781                         __free_page(rdpg->rp_pages[i]);
1782         OBD_FREE(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1783
1784         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
1785                 RETURN(0);
1786
1787         return rc;
1788 }
1789
1790 static int mdt_reint_internal(struct mdt_thread_info *info,
1791                               struct mdt_lock_handle *lhc,
1792                               __u32 op)
1793 {
1794         struct req_capsule      *pill = info->mti_pill;
1795         struct mdt_body         *repbody;
1796         int                      rc = 0, rc2;
1797
1798         ENTRY;
1799
1800         rc = mdt_reint_unpack(info, op);
1801         if (rc != 0) {
1802                 CERROR("Can't unpack reint, rc %d\n", rc);
1803                 RETURN(err_serious(rc));
1804         }
1805
1806         /* for replay (no_create) lmm is not needed, client has it already */
1807         if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1808                 req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
1809                                      DEF_REP_MD_SIZE);
1810
1811         /* llog cookies are always 0, the field is kept for compatibility */
1812         if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
1813                 req_capsule_set_size(pill, &RMF_LOGCOOKIES, RCL_SERVER, 0);
1814
1815         rc = req_capsule_server_pack(pill);
1816         if (rc != 0) {
1817                 CERROR("Can't pack response, rc %d\n", rc);
1818                 RETURN(err_serious(rc));
1819         }
1820
1821         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_SERVER)) {
1822                 repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1823                 LASSERT(repbody);
1824                 repbody->eadatasize = 0;
1825                 repbody->aclsize = 0;
1826         }
1827
1828         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_REINT_DELAY, 10);
1829
1830         /* for replay no cookkie / lmm need, because client have this already */
1831         if (info->mti_spec.no_create)
1832                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1833                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, 0);
1834
1835         rc = mdt_init_ucred_reint(info);
1836         if (rc)
1837                 GOTO(out_shrink, rc);
1838
1839         rc = mdt_fix_attr_ucred(info, op);
1840         if (rc != 0)
1841                 GOTO(out_ucred, rc = err_serious(rc));
1842
1843         if (mdt_check_resent(info, mdt_reconstruct, lhc)) {
1844                 DEBUG_REQ(D_INODE, mdt_info_req(info), "resent opt.");
1845                 rc = lustre_msg_get_status(mdt_info_req(info)->rq_repmsg);
1846                 GOTO(out_ucred, rc);
1847         }
1848         rc = mdt_reint_rec(info, lhc);
1849         EXIT;
1850 out_ucred:
1851         mdt_exit_ucred(info);
1852 out_shrink:
1853         mdt_client_compatibility(info);
1854         rc2 = mdt_fix_reply(info);
1855         if (rc == 0)
1856                 rc = rc2;
1857         return rc;
1858 }
1859
1860 static long mdt_reint_opcode(struct ptlrpc_request *req,
1861                              const struct req_format **fmt)
1862 {
1863         struct mdt_device       *mdt;
1864         struct mdt_rec_reint    *rec;
1865         long                     opc;
1866
1867         rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
1868         if (rec != NULL) {
1869                 opc = rec->rr_opcode;
1870                 DEBUG_REQ(D_INODE, req, "reint opt = %ld", opc);
1871                 if (opc < REINT_MAX && fmt[opc] != NULL)
1872                         req_capsule_extend(&req->rq_pill, fmt[opc]);
1873                 else {
1874                         mdt = mdt_exp2dev(req->rq_export);
1875                         CERROR("%s: Unsupported opcode '%ld' from client '%s':"
1876                                " rc = %d\n", req->rq_export->exp_obd->obd_name,
1877                                opc, mdt->mdt_ldlm_client->cli_name, -EFAULT);
1878                         opc = err_serious(-EFAULT);
1879                 }
1880         } else {
1881                 opc = err_serious(-EFAULT);
1882         }
1883         return opc;
1884 }
1885
1886 static int mdt_reint(struct tgt_session_info *tsi)
1887 {
1888         long opc;
1889         int  rc;
1890         static const struct req_format *reint_fmts[REINT_MAX] = {
1891                 [REINT_SETATTR]  = &RQF_MDS_REINT_SETATTR,
1892                 [REINT_CREATE]   = &RQF_MDS_REINT_CREATE,
1893                 [REINT_LINK]     = &RQF_MDS_REINT_LINK,
1894                 [REINT_UNLINK]   = &RQF_MDS_REINT_UNLINK,
1895                 [REINT_RENAME]   = &RQF_MDS_REINT_RENAME,
1896                 [REINT_OPEN]     = &RQF_MDS_REINT_OPEN,
1897                 [REINT_SETXATTR] = &RQF_MDS_REINT_SETXATTR,
1898                 [REINT_RMENTRY]  = &RQF_MDS_REINT_UNLINK,
1899                 [REINT_MIGRATE]  = &RQF_MDS_REINT_RENAME
1900         };
1901
1902         ENTRY;
1903
1904         opc = mdt_reint_opcode(tgt_ses_req(tsi), reint_fmts);
1905         if (opc >= 0) {
1906                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
1907                 /*
1908                  * No lock possible here from client to pass it to reint code
1909                  * path.
1910                  */
1911                 rc = mdt_reint_internal(info, NULL, opc);
1912                 mdt_thread_info_fini(info);
1913         } else {
1914                 rc = opc;
1915         }
1916
1917         tsi->tsi_reply_fail_id = OBD_FAIL_MDS_REINT_NET_REP;
1918         RETURN(rc);
1919 }
1920
1921 /* this should sync the whole device */
1922 static int mdt_device_sync(const struct lu_env *env, struct mdt_device *mdt)
1923 {
1924         struct dt_device *dt = mdt->mdt_bottom;
1925         int rc;
1926         ENTRY;
1927
1928         rc = dt->dd_ops->dt_sync(env, dt);
1929         RETURN(rc);
1930 }
1931
1932 /* this should sync this object */
1933 static int mdt_object_sync(struct mdt_thread_info *info)
1934 {
1935         struct md_object *next;
1936         int rc;
1937         ENTRY;
1938
1939         if (!mdt_object_exists(info->mti_object)) {
1940                 CWARN("Non existing object  "DFID"!\n",
1941                       PFID(mdt_object_fid(info->mti_object)));
1942                 RETURN(-ESTALE);
1943         }
1944         next = mdt_object_child(info->mti_object);
1945         rc = mo_object_sync(info->mti_env, next);
1946
1947         RETURN(rc);
1948 }
1949
1950 static int mdt_sync(struct tgt_session_info *tsi)
1951 {
1952         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1953         struct req_capsule      *pill = tsi->tsi_pill;
1954         struct mdt_body         *body;
1955         int                      rc;
1956
1957         ENTRY;
1958
1959         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SYNC_PACK))
1960                 RETURN(err_serious(-ENOMEM));
1961
1962         if (fid_seq(&tsi->tsi_mdt_body->fid1) == 0) {
1963                 rc = mdt_device_sync(tsi->tsi_env, mdt_exp2dev(tsi->tsi_exp));
1964         } else {
1965                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
1966
1967                 /* sync an object */
1968                 rc = mdt_object_sync(info);
1969                 if (rc == 0) {
1970                         const struct lu_fid *fid;
1971                         struct lu_attr *la = &info->mti_attr.ma_attr;
1972
1973                         info->mti_attr.ma_need = MA_INODE;
1974                         info->mti_attr.ma_valid = 0;
1975                         rc = mdt_attr_get_complex(info, info->mti_object,
1976                                                   &info->mti_attr);
1977                         if (rc == 0) {
1978                                 body = req_capsule_server_get(pill,
1979                                                               &RMF_MDT_BODY);
1980                                 fid = mdt_object_fid(info->mti_object);
1981                                 mdt_pack_attr2body(info, body, la, fid);
1982                         }
1983                 }
1984                 mdt_thread_info_fini(info);
1985         }
1986         if (rc == 0)
1987                 mdt_counter_incr(req, LPROC_MDT_SYNC);
1988
1989         RETURN(rc);
1990 }
1991
1992 /*
1993  * Handle quota control requests to consult current usage/limit, but also
1994  * to configure quota enforcement
1995  */
1996 static int mdt_quotactl(struct tgt_session_info *tsi)
1997 {
1998         struct obd_export       *exp  = tsi->tsi_exp;
1999         struct req_capsule      *pill = tsi->tsi_pill;
2000         struct obd_quotactl     *oqctl, *repoqc;
2001         int                      id, rc;
2002         struct mdt_device       *mdt = mdt_exp2dev(exp);
2003         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2004         ENTRY;
2005
2006         oqctl = req_capsule_client_get(pill, &RMF_OBD_QUOTACTL);
2007         if (oqctl == NULL)
2008                 RETURN(err_serious(-EPROTO));
2009
2010         rc = req_capsule_server_pack(pill);
2011         if (rc)
2012                 RETURN(err_serious(rc));
2013
2014         switch (oqctl->qc_cmd) {
2015         case Q_QUOTACHECK:
2016         case LUSTRE_Q_INVALIDATE:
2017         case LUSTRE_Q_FINVALIDATE:
2018         case Q_QUOTAON:
2019         case Q_QUOTAOFF:
2020         case Q_INITQUOTA:
2021                 /* deprecated, not used any more */
2022                 RETURN(-EOPNOTSUPP);
2023                 /* master quotactl */
2024         case Q_GETINFO:
2025         case Q_SETINFO:
2026         case Q_SETQUOTA:
2027         case Q_GETQUOTA:
2028                 if (qmt == NULL)
2029                         RETURN(-EOPNOTSUPP);
2030                 /* slave quotactl */
2031         case Q_GETOINFO:
2032         case Q_GETOQUOTA:
2033                 break;
2034         default:
2035                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2036                 RETURN(-EFAULT);
2037         }
2038
2039         /* map uid/gid for remote client */
2040         id = oqctl->qc_id;
2041         if (exp_connect_rmtclient(exp)) {
2042                 struct lustre_idmap_table *idmap;
2043
2044                 idmap = exp->exp_mdt_data.med_idmap;
2045
2046                 if (unlikely(oqctl->qc_cmd != Q_GETQUOTA &&
2047                              oqctl->qc_cmd != Q_GETINFO))
2048                         RETURN(-EPERM);
2049
2050                 if (oqctl->qc_type == USRQUOTA)
2051                         id = lustre_idmap_lookup_uid(NULL, idmap, 0,
2052                                                      oqctl->qc_id);
2053                 else if (oqctl->qc_type == GRPQUOTA)
2054                         id = lustre_idmap_lookup_gid(NULL, idmap, 0,
2055                                                      oqctl->qc_id);
2056                 else
2057                         RETURN(-EINVAL);
2058
2059                 if (id == CFS_IDMAP_NOTFOUND) {
2060                         CDEBUG(D_QUOTA, "no mapping for id %u\n", oqctl->qc_id);
2061                         RETURN(-EACCES);
2062                 }
2063         }
2064
2065         repoqc = req_capsule_server_get(pill, &RMF_OBD_QUOTACTL);
2066         if (repoqc == NULL)
2067                 RETURN(err_serious(-EFAULT));
2068
2069         if (oqctl->qc_id != id)
2070                 swap(oqctl->qc_id, id);
2071
2072         switch (oqctl->qc_cmd) {
2073
2074         case Q_GETINFO:
2075         case Q_SETINFO:
2076         case Q_SETQUOTA:
2077         case Q_GETQUOTA:
2078                 /* forward quotactl request to QMT */
2079                 rc = qmt_hdls.qmth_quotactl(tsi->tsi_env, qmt, oqctl);
2080                 break;
2081
2082         case Q_GETOINFO:
2083         case Q_GETOQUOTA:
2084                 /* slave quotactl */
2085                 rc = lquotactl_slv(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
2086                                    oqctl);
2087                 break;
2088
2089         default:
2090                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2091                 RETURN(-EFAULT);
2092         }
2093
2094         if (oqctl->qc_id != id)
2095                 swap(oqctl->qc_id, id);
2096
2097         *repoqc = *oqctl;
2098         RETURN(rc);
2099 }
2100
2101 /** clone llog ctxt from child (mdd)
2102  * This allows remote llog (replicator) access.
2103  * We can either pass all llog RPCs (eg mdt_llog_create) on to child where the
2104  * context was originally set up, or we can handle them directly.
2105  * I choose the latter, but that means I need any llog
2106  * contexts set up by child to be accessable by the mdt.  So we clone the
2107  * context into our context list here.
2108  */
2109 static int mdt_llog_ctxt_clone(const struct lu_env *env, struct mdt_device *mdt,
2110                                int idx)
2111 {
2112         struct md_device  *next = mdt->mdt_child;
2113         struct llog_ctxt *ctxt;
2114         int rc;
2115
2116         if (!llog_ctxt_null(mdt2obd_dev(mdt), idx))
2117                 return 0;
2118
2119         rc = next->md_ops->mdo_llog_ctxt_get(env, next, idx, (void **)&ctxt);
2120         if (rc || ctxt == NULL) {
2121                 return 0;
2122         }
2123
2124         rc = llog_group_set_ctxt(&mdt2obd_dev(mdt)->obd_olg, ctxt, idx);
2125         if (rc)
2126                 CERROR("Can't set mdt ctxt %d\n", rc);
2127
2128         return rc;
2129 }
2130
2131 static int mdt_llog_ctxt_unclone(const struct lu_env *env,
2132                                  struct mdt_device *mdt, int idx)
2133 {
2134         struct llog_ctxt *ctxt;
2135
2136         ctxt = llog_get_context(mdt2obd_dev(mdt), idx);
2137         if (ctxt == NULL)
2138                 return 0;
2139         /* Put once for the get we just did, and once for the clone */
2140         llog_ctxt_put(ctxt);
2141         llog_ctxt_put(ctxt);
2142         return 0;
2143 }
2144
2145 /*
2146  * sec context handlers
2147  */
2148 static int mdt_sec_ctx_handle(struct tgt_session_info *tsi)
2149 {
2150         int rc;
2151
2152         rc = mdt_handle_idmap(tsi);
2153         if (unlikely(rc)) {
2154                 struct ptlrpc_request   *req = tgt_ses_req(tsi);
2155                 __u32                    opc;
2156
2157                 opc = lustre_msg_get_opc(req->rq_reqmsg);
2158                 if (opc == SEC_CTX_INIT || opc == SEC_CTX_INIT_CONT)
2159                         sptlrpc_svc_ctx_invalidate(req);
2160         }
2161
2162         CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
2163
2164         return rc;
2165 }
2166
2167 /*
2168  * quota request handlers
2169  */
2170 static int mdt_quota_dqacq(struct tgt_session_info *tsi)
2171 {
2172         struct mdt_device       *mdt = mdt_exp2dev(tsi->tsi_exp);
2173         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2174         int                      rc;
2175         ENTRY;
2176
2177         if (qmt == NULL)
2178                 RETURN(err_serious(-EOPNOTSUPP));
2179
2180         rc = qmt_hdls.qmth_dqacq(tsi->tsi_env, qmt, tgt_ses_req(tsi));
2181         RETURN(rc);
2182 }
2183
2184 struct mdt_object *mdt_object_new(const struct lu_env *env,
2185                                   struct mdt_device *d,
2186                                   const struct lu_fid *f)
2187 {
2188         struct lu_object_conf conf = { .loc_flags = LOC_F_NEW };
2189         struct lu_object *o;
2190         struct mdt_object *m;
2191         ENTRY;
2192
2193         CDEBUG(D_INFO, "Allocate object for "DFID"\n", PFID(f));
2194         o = lu_object_find(env, &d->mdt_lu_dev, f, &conf);
2195         if (unlikely(IS_ERR(o)))
2196                 m = (struct mdt_object *)o;
2197         else
2198                 m = mdt_obj(o);
2199         RETURN(m);
2200 }
2201
2202 struct mdt_object *mdt_object_find(const struct lu_env *env,
2203                                    struct mdt_device *d,
2204                                    const struct lu_fid *f)
2205 {
2206         struct lu_object *o;
2207         struct mdt_object *m;
2208         ENTRY;
2209
2210         CDEBUG(D_INFO, "Find object for "DFID"\n", PFID(f));
2211         o = lu_object_find(env, &d->mdt_lu_dev, f, NULL);
2212         if (unlikely(IS_ERR(o)))
2213                 m = (struct mdt_object *)o;
2214         else
2215                 m = mdt_obj(o);
2216
2217         RETURN(m);
2218 }
2219
2220 /**
2221  * Asyncronous commit for mdt device.
2222  *
2223  * Pass asynchonous commit call down the MDS stack.
2224  *
2225  * \param env environment
2226  * \param mdt the mdt device
2227  */
2228 static void mdt_device_commit_async(const struct lu_env *env,
2229                                     struct mdt_device *mdt)
2230 {
2231         struct dt_device *dt = mdt->mdt_bottom;
2232         int rc;
2233
2234         rc = dt->dd_ops->dt_commit_async(env, dt);
2235         if (unlikely(rc != 0))
2236                 CWARN("async commit start failed with rc = %d", rc);
2237 }
2238
2239 /**
2240  * Mark the lock as "synchonous".
2241  *
2242  * Mark the lock to deffer transaction commit to the unlock time.
2243  *
2244  * \param lock the lock to mark as "synchonous"
2245  *
2246  * \see mdt_is_lock_sync
2247  * \see mdt_save_lock
2248  */
2249 static inline void mdt_set_lock_sync(struct ldlm_lock *lock)
2250 {
2251         lock->l_ast_data = (void*)1;
2252 }
2253
2254 /**
2255  * Check whehter the lock "synchonous" or not.
2256  *
2257  * \param lock the lock to check
2258  * \retval 1 the lock is "synchonous"
2259  * \retval 0 the lock isn't "synchronous"
2260  *
2261  * \see mdt_set_lock_sync
2262  * \see mdt_save_lock
2263  */
2264 static inline int mdt_is_lock_sync(struct ldlm_lock *lock)
2265 {
2266         return lock->l_ast_data != NULL;
2267 }
2268
2269 /**
2270  * Blocking AST for mdt locks.
2271  *
2272  * Starts transaction commit if in case of COS lock conflict or
2273  * deffers such a commit to the mdt_save_lock.
2274  *
2275  * \param lock the lock which blocks a request or cancelling lock
2276  * \param desc unused
2277  * \param data unused
2278  * \param flag indicates whether this cancelling or blocking callback
2279  * \retval 0
2280  * \see ldlm_blocking_ast_nocheck
2281  */
2282 int mdt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2283                      void *data, int flag)
2284 {
2285         struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
2286         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
2287         int rc;
2288         ENTRY;
2289
2290         if (flag == LDLM_CB_CANCELING)
2291                 RETURN(0);
2292         lock_res_and_lock(lock);
2293         if (lock->l_blocking_ast != mdt_blocking_ast) {
2294                 unlock_res_and_lock(lock);
2295                 RETURN(0);
2296         }
2297         if (mdt_cos_is_enabled(mdt) &&
2298             lock->l_req_mode & (LCK_PW | LCK_EX) &&
2299             lock->l_blocking_lock != NULL &&
2300             lock->l_client_cookie != lock->l_blocking_lock->l_client_cookie) {
2301                 mdt_set_lock_sync(lock);
2302         }
2303         rc = ldlm_blocking_ast_nocheck(lock);
2304
2305         /* There is no lock conflict if l_blocking_lock == NULL,
2306          * it indicates a blocking ast sent from ldlm_lock_decref_internal
2307          * when the last reference to a local lock was released */
2308         if (lock->l_req_mode == LCK_COS && lock->l_blocking_lock != NULL) {
2309                 struct lu_env env;
2310
2311                 rc = lu_env_init(&env, LCT_LOCAL);
2312                 if (unlikely(rc != 0))
2313                         CWARN("lu_env initialization failed with rc = %d,"
2314                               "cannot start asynchronous commit\n", rc);
2315                 else
2316                         mdt_device_commit_async(&env, mdt);
2317                 lu_env_fini(&env);
2318         }
2319         RETURN(rc);
2320 }
2321
2322 /* Used for cross-MDT lock */
2323 int mdt_remote_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2324                             void *data, int flag)
2325 {
2326         struct lustre_handle lockh;
2327         int               rc;
2328
2329         switch (flag) {
2330         case LDLM_CB_BLOCKING:
2331                 ldlm_lock2handle(lock, &lockh);
2332                 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
2333                 if (rc < 0) {
2334                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
2335                         RETURN(rc);
2336                 }
2337                 break;
2338         case LDLM_CB_CANCELING:
2339                 LDLM_DEBUG(lock, "Revoke remote lock\n");
2340                 break;
2341         default:
2342                 LBUG();
2343         }
2344         RETURN(0);
2345 }
2346
2347 int mdt_remote_object_lock(struct mdt_thread_info *mti,
2348                            struct mdt_object *o, const struct lu_fid *fid,
2349                            struct lustre_handle *lh, ldlm_mode_t mode,
2350                            __u64 ibits)
2351 {
2352         struct ldlm_enqueue_info *einfo = &mti->mti_einfo;
2353         ldlm_policy_data_t *policy = &mti->mti_policy;
2354         struct ldlm_res_id *res_id = &mti->mti_res_id;
2355         int rc = 0;
2356         ENTRY;
2357
2358         LASSERT(mdt_object_remote(o));
2359
2360         LASSERT(ibits == MDS_INODELOCK_UPDATE);
2361
2362         fid_build_reg_res_name(fid, res_id);
2363
2364         memset(einfo, 0, sizeof(*einfo));
2365         einfo->ei_type = LDLM_IBITS;
2366         einfo->ei_mode = mode;
2367         einfo->ei_cb_bl = mdt_remote_blocking_ast;
2368         einfo->ei_cb_cp = ldlm_completion_ast;
2369         einfo->ei_enq_slave = 0;
2370         einfo->ei_res_id = res_id;
2371
2372         memset(policy, 0, sizeof(*policy));
2373         policy->l_inodebits.bits = ibits;
2374
2375         rc = mo_object_lock(mti->mti_env, mdt_object_child(o), lh, einfo,
2376                             policy);
2377         RETURN(rc);
2378 }
2379
2380 static int mdt_object_local_lock(struct mdt_thread_info *info,
2381                                  struct mdt_object *o,
2382                                  struct mdt_lock_handle *lh, __u64 ibits,
2383                                  bool nonblock, int locality)
2384 {
2385         struct ldlm_namespace *ns = info->mti_mdt->mdt_namespace;
2386         ldlm_policy_data_t *policy = &info->mti_policy;
2387         struct ldlm_res_id *res_id = &info->mti_res_id;
2388         __u64 dlmflags;
2389         int rc;
2390         ENTRY;
2391
2392         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2393         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2394         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
2395         LASSERT(lh->mlh_type != MDT_NUL_LOCK);
2396
2397         /* Only enqueue LOOKUP lock for remote object */
2398         if (mdt_object_remote(o))
2399                 LASSERT(ibits == MDS_INODELOCK_LOOKUP);
2400
2401         if (lh->mlh_type == MDT_PDO_LOCK) {
2402                 /* check for exists after object is locked */
2403                 if (mdt_object_exists(o) == 0) {
2404                         /* Non-existent object shouldn't have PDO lock */
2405                         RETURN(-ESTALE);
2406                 } else {
2407                         /* Non-dir object shouldn't have PDO lock */
2408                         if (!S_ISDIR(lu_object_attr(&o->mot_obj)))
2409                                 RETURN(-ENOTDIR);
2410                 }
2411         }
2412
2413         memset(policy, 0, sizeof(*policy));
2414         fid_build_reg_res_name(mdt_object_fid(o), res_id);
2415
2416         dlmflags = LDLM_FL_ATOMIC_CB;
2417         if (nonblock)
2418                 dlmflags |= LDLM_FL_BLOCK_NOWAIT;
2419
2420         /*
2421          * Take PDO lock on whole directory and build correct @res_id for lock
2422          * on part of directory.
2423          */
2424         if (lh->mlh_pdo_hash != 0) {
2425                 LASSERT(lh->mlh_type == MDT_PDO_LOCK);
2426                 mdt_lock_pdo_mode(info, o, lh);
2427                 if (lh->mlh_pdo_mode != LCK_NL) {
2428                         /*
2429                          * Do not use LDLM_FL_LOCAL_ONLY for parallel lock, it
2430                          * is never going to be sent to client and we do not
2431                          * want it slowed down due to possible cancels.
2432                          */
2433                         policy->l_inodebits.bits = MDS_INODELOCK_UPDATE;
2434                         rc = mdt_fid_lock(ns, &lh->mlh_pdo_lh, lh->mlh_pdo_mode,
2435                                           policy, res_id, dlmflags,
2436                                           info->mti_exp == NULL ? NULL :
2437                                           &info->mti_exp->exp_handle.h_cookie);
2438                         if (unlikely(rc))
2439                                 RETURN(rc);
2440                 }
2441
2442                 /*
2443                  * Finish res_id initializing by name hash marking part of
2444                  * directory which is taking modification.
2445                  */
2446                 res_id->name[LUSTRE_RES_ID_HSH_OFF] = lh->mlh_pdo_hash;
2447         }
2448
2449         policy->l_inodebits.bits = ibits;
2450
2451         /*
2452          * Use LDLM_FL_LOCAL_ONLY for this lock. We do not know yet if it is
2453          * going to be sent to client. If it is - mdt_intent_policy() path will
2454          * fix it up and turn FL_LOCAL flag off.
2455          */
2456         rc = mdt_fid_lock(ns, &lh->mlh_reg_lh, lh->mlh_reg_mode, policy,
2457                           res_id, LDLM_FL_LOCAL_ONLY | dlmflags,
2458                           info->mti_exp == NULL ? NULL :
2459                           &info->mti_exp->exp_handle.h_cookie);
2460         if (rc)
2461                 mdt_object_unlock(info, o, lh, 1);
2462         else if (unlikely(OBD_FAIL_PRECHECK(OBD_FAIL_MDS_PDO_LOCK)) &&
2463                  lh->mlh_pdo_hash != 0 &&
2464                  (lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX)) {
2465                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_PDO_LOCK, 15);
2466         }
2467
2468         RETURN(rc);
2469 }
2470
2471 static int
2472 mdt_object_lock_internal(struct mdt_thread_info *info, struct mdt_object *o,
2473                          struct mdt_lock_handle *lh, __u64 ibits,
2474                          bool nonblock, int locality)
2475 {
2476         int rc;
2477         ENTRY;
2478
2479         if (!mdt_object_remote(o))
2480                 return mdt_object_local_lock(info, o, lh, ibits, nonblock,
2481                                              locality);
2482
2483         if (locality == MDT_LOCAL_LOCK) {
2484                 CERROR("%s: try to get local lock for remote object"
2485                        DFID".\n", mdt_obd_name(info->mti_mdt),
2486                        PFID(mdt_object_fid(o)));
2487                 RETURN(-EPROTO);
2488         }
2489
2490         /* XXX do not support PERM/LAYOUT/XATTR lock for remote object yet */
2491         ibits &= ~(MDS_INODELOCK_PERM | MDS_INODELOCK_LAYOUT |
2492                    MDS_INODELOCK_XATTR);
2493         if (ibits & MDS_INODELOCK_UPDATE) {
2494                 /* Sigh, PDO needs to enqueue 2 locks right now, but
2495                  * enqueue RPC can only request 1 lock, to avoid extra
2496                  * RPC, so it will instead enqueue EX lock for remote
2497                  * object anyway XXX*/
2498                 if (lh->mlh_type == MDT_PDO_LOCK &&
2499                     lh->mlh_pdo_hash != 0) {
2500                         CDEBUG(D_INFO, "%s: "DFID" convert PDO lock to"
2501                                "EX lock.\n", mdt_obd_name(info->mti_mdt),
2502                                PFID(mdt_object_fid(o)));
2503                         lh->mlh_pdo_hash = 0;
2504                         lh->mlh_rreg_mode = LCK_EX;
2505                         lh->mlh_type = MDT_REG_LOCK;
2506                 }
2507                 rc = mdt_remote_object_lock(info, o, mdt_object_fid(o),
2508                                             &lh->mlh_rreg_lh,
2509                                             lh->mlh_rreg_mode,
2510                                             MDS_INODELOCK_UPDATE);
2511                 if (rc != ELDLM_OK)
2512                         RETURN(rc);
2513         }
2514
2515         /* Only enqueue LOOKUP lock for remote object */
2516         if (ibits & MDS_INODELOCK_LOOKUP) {
2517                 rc = mdt_object_local_lock(info, o, lh,
2518                                            MDS_INODELOCK_LOOKUP,
2519                                            nonblock, locality);
2520                 if (rc != ELDLM_OK)
2521                         RETURN(rc);
2522         }
2523
2524         RETURN(0);
2525 }
2526
2527 int mdt_object_lock(struct mdt_thread_info *info, struct mdt_object *o,
2528                     struct mdt_lock_handle *lh, __u64 ibits, int locality)
2529 {
2530         return mdt_object_lock_internal(info, o, lh, ibits, false, locality);
2531 }
2532
2533 int mdt_object_lock_try(struct mdt_thread_info *info, struct mdt_object *o,
2534                         struct mdt_lock_handle *lh, __u64 ibits, int locality)
2535 {
2536         struct mdt_lock_handle tmp = *lh;
2537         int rc;
2538
2539         rc = mdt_object_lock_internal(info, o, &tmp, ibits, true, locality);
2540         if (rc == 0)
2541                 *lh = tmp;
2542
2543         return rc == 0;
2544 }
2545
2546 /**
2547  * Save a lock within request object.
2548  *
2549  * Keep the lock referenced until whether client ACK or transaction
2550  * commit happens or release the lock immediately depending on input
2551  * parameters. If COS is ON, a write lock is converted to COS lock
2552  * before saving.
2553  *
2554  * \param info thead info object
2555  * \param h lock handle
2556  * \param mode lock mode
2557  * \param decref force immediate lock releasing
2558  */
2559 static
2560 void mdt_save_lock(struct mdt_thread_info *info, struct lustre_handle *h,
2561                    ldlm_mode_t mode, int decref)
2562 {
2563         ENTRY;
2564
2565         if (lustre_handle_is_used(h)) {
2566                 if (decref || !info->mti_has_trans ||
2567                     !(mode & (LCK_PW | LCK_EX))){
2568                         mdt_fid_unlock(h, mode);
2569                 } else {
2570                         struct mdt_device *mdt = info->mti_mdt;
2571                         struct ldlm_lock *lock = ldlm_handle2lock(h);
2572                         struct ptlrpc_request *req = mdt_info_req(info);
2573                         int no_ack = 0;
2574
2575                         LASSERTF(lock != NULL, "no lock for cookie "LPX64"\n",
2576                                  h->cookie);
2577                         /* there is no request if mdt_object_unlock() is called
2578                          * from mdt_export_cleanup()->mdt_add_dirty_flag() */
2579                         if (likely(req != NULL)) {
2580                                 CDEBUG(D_HA, "request = %p reply state = %p"
2581                                        " transno = "LPD64"\n", req,
2582                                        req->rq_reply_state, req->rq_transno);
2583                                 if (mdt_cos_is_enabled(mdt)) {
2584                                         no_ack = 1;
2585                                         ldlm_lock_downgrade(lock, LCK_COS);
2586                                         mode = LCK_COS;
2587                                 }
2588                                 ptlrpc_save_lock(req, h, mode, no_ack);
2589                         } else {
2590                                 ldlm_lock_decref(h, mode);
2591                         }
2592                         if (mdt_is_lock_sync(lock)) {
2593                                 CDEBUG(D_HA, "found sync-lock,"
2594                                        " async commit started\n");
2595                                 mdt_device_commit_async(info->mti_env,
2596                                                         mdt);
2597                         }
2598                         LDLM_LOCK_PUT(lock);
2599                 }
2600                 h->cookie = 0ull;
2601         }
2602
2603         EXIT;
2604 }
2605
2606 /**
2607  * Unlock mdt object.
2608  *
2609  * Immeditely release the regular lock and the PDO lock or save the
2610  * lock in reqeuest and keep them referenced until client ACK or
2611  * transaction commit.
2612  *
2613  * \param info thread info object
2614  * \param o mdt object
2615  * \param lh mdt lock handle referencing regular and PDO locks
2616  * \param decref force immediate lock releasing
2617  */
2618 void mdt_object_unlock(struct mdt_thread_info *info, struct mdt_object *o,
2619                        struct mdt_lock_handle *lh, int decref)
2620 {
2621         ENTRY;
2622
2623         mdt_save_lock(info, &lh->mlh_pdo_lh, lh->mlh_pdo_mode, decref);
2624         mdt_save_lock(info, &lh->mlh_reg_lh, lh->mlh_reg_mode, decref);
2625
2626         if (lustre_handle_is_used(&lh->mlh_rreg_lh))
2627                 ldlm_lock_decref(&lh->mlh_rreg_lh, lh->mlh_rreg_mode);
2628
2629         EXIT;
2630 }
2631
2632 struct mdt_object *mdt_object_find_lock(struct mdt_thread_info *info,
2633                                         const struct lu_fid *f,
2634                                         struct mdt_lock_handle *lh,
2635                                         __u64 ibits)
2636 {
2637         struct mdt_object *o;
2638
2639         o = mdt_object_find(info->mti_env, info->mti_mdt, f);
2640         if (!IS_ERR(o)) {
2641                 int rc;
2642
2643                 rc = mdt_object_lock(info, o, lh, ibits,
2644                                      MDT_LOCAL_LOCK);
2645                 if (rc != 0) {
2646                         mdt_object_put(info->mti_env, o);
2647                         o = ERR_PTR(rc);
2648                 }
2649         }
2650         return o;
2651 }
2652
2653 void mdt_object_unlock_put(struct mdt_thread_info * info,
2654                            struct mdt_object * o,
2655                            struct mdt_lock_handle *lh,
2656                            int decref)
2657 {
2658         mdt_object_unlock(info, o, lh, decref);
2659         mdt_object_put(info->mti_env, o);
2660 }
2661
2662 /*
2663  * Generic code handling requests that have struct mdt_body passed in:
2664  *
2665  *  - extract mdt_body from request and save it in @info, if present;
2666  *
2667  *  - create lu_object, corresponding to the fid in mdt_body, and save it in
2668  *  @info;
2669  *
2670  *  - if HABEO_CORPUS flag is set for this request type check whether object
2671  *  actually exists on storage (lu_object_exists()).
2672  *
2673  */
2674 static int mdt_body_unpack(struct mdt_thread_info *info, __u32 flags)
2675 {
2676         const struct mdt_body    *body;
2677         struct mdt_object        *obj;
2678         const struct lu_env      *env;
2679         struct req_capsule       *pill;
2680         int                       rc;
2681         ENTRY;
2682
2683         env = info->mti_env;
2684         pill = info->mti_pill;
2685
2686         body = info->mti_body = req_capsule_client_get(pill, &RMF_MDT_BODY);
2687         if (body == NULL)
2688                 RETURN(-EFAULT);
2689
2690         if (!(body->valid & OBD_MD_FLID))
2691                 RETURN(0);
2692
2693         if (!fid_is_sane(&body->fid1)) {
2694                 CERROR("Invalid fid: "DFID"\n", PFID(&body->fid1));
2695                 RETURN(-EINVAL);
2696         }
2697
2698         /*
2699          * Do not get size or any capa fields before we check that request
2700          * contains capa actually. There are some requests which do not, for
2701          * instance MDS_IS_SUBDIR.
2702          */
2703         if (req_capsule_has_field(pill, &RMF_CAPA1, RCL_CLIENT) &&
2704             req_capsule_get_size(pill, &RMF_CAPA1, RCL_CLIENT))
2705                 mdt_set_capainfo(info, 0, &body->fid1,
2706                                  req_capsule_client_get(pill, &RMF_CAPA1));
2707
2708         obj = mdt_object_find(env, info->mti_mdt, &body->fid1);
2709         if (!IS_ERR(obj)) {
2710                 if ((flags & HABEO_CORPUS) &&
2711                     !mdt_object_exists(obj)) {
2712                         mdt_object_put(env, obj);
2713                         /* for capability renew ENOENT will be handled in
2714                          * mdt_renew_capa */
2715                         if (body->valid & OBD_MD_FLOSSCAPA)
2716                                 rc = 0;
2717                         else
2718                                 rc = -ENOENT;
2719                 } else {
2720                         info->mti_object = obj;
2721                         rc = 0;
2722                 }
2723         } else
2724                 rc = PTR_ERR(obj);
2725
2726         RETURN(rc);
2727 }
2728
2729 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags)
2730 {
2731         struct req_capsule *pill = info->mti_pill;
2732         int rc;
2733         ENTRY;
2734
2735         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT))
2736                 rc = mdt_body_unpack(info, flags);
2737         else
2738                 rc = 0;
2739
2740         if (rc == 0 && (flags & HABEO_REFERO)) {
2741                 /* Pack reply. */
2742                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
2743                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
2744                                              DEF_REP_MD_SIZE);
2745                 if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
2746                         req_capsule_set_size(pill, &RMF_LOGCOOKIES,
2747                                              RCL_SERVER, 0);
2748
2749                 rc = req_capsule_server_pack(pill);
2750         }
2751         RETURN(rc);
2752 }
2753
2754 static int mdt_init_capa_ctxt(const struct lu_env *env, struct mdt_device *m)
2755 {
2756         struct md_device *next = m->mdt_child;
2757
2758         return next->md_ops->mdo_init_capa_ctxt(env, next,
2759                                                 m->mdt_lut.lut_mds_capa,
2760                                                 m->mdt_capa_timeout,
2761                                                 m->mdt_capa_alg,
2762                                                 m->mdt_capa_keys);
2763 }
2764
2765 void mdt_lock_handle_init(struct mdt_lock_handle *lh)
2766 {
2767         lh->mlh_type = MDT_NUL_LOCK;
2768         lh->mlh_reg_lh.cookie = 0ull;
2769         lh->mlh_reg_mode = LCK_MINMODE;
2770         lh->mlh_pdo_lh.cookie = 0ull;
2771         lh->mlh_pdo_mode = LCK_MINMODE;
2772         lh->mlh_rreg_lh.cookie = 0ull;
2773         lh->mlh_rreg_mode = LCK_MINMODE;
2774 }
2775
2776 void mdt_lock_handle_fini(struct mdt_lock_handle *lh)
2777 {
2778         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2779         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2780 }
2781
2782 /*
2783  * Initialize fields of struct mdt_thread_info. Other fields are left in
2784  * uninitialized state, because it's too expensive to zero out whole
2785  * mdt_thread_info (> 1K) on each request arrival.
2786  */
2787 void mdt_thread_info_init(struct ptlrpc_request *req,
2788                           struct mdt_thread_info *info)
2789 {
2790         int i;
2791
2792         info->mti_pill = &req->rq_pill;
2793
2794         /* lock handle */
2795         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
2796                 mdt_lock_handle_init(&info->mti_lh[i]);
2797
2798         /* mdt device: it can be NULL while CONNECT */
2799         if (req->rq_export) {
2800                 info->mti_mdt = mdt_dev(req->rq_export->exp_obd->obd_lu_dev);
2801                 info->mti_exp = req->rq_export;
2802         } else
2803                 info->mti_mdt = NULL;
2804         info->mti_env = req->rq_svc_thread->t_env;
2805         info->mti_transno = lustre_msg_get_transno(req->rq_reqmsg);
2806
2807         memset(&info->mti_attr, 0, sizeof(info->mti_attr));
2808         info->mti_big_buf = LU_BUF_NULL;
2809         info->mti_body = NULL;
2810         info->mti_object = NULL;
2811         info->mti_dlm_req = NULL;
2812         info->mti_has_trans = 0;
2813         info->mti_cross_ref = 0;
2814         info->mti_opdata = 0;
2815         info->mti_big_lmm_used = 0;
2816
2817         info->mti_spec.no_create = 0;
2818         info->mti_spec.sp_rm_entry = 0;
2819
2820         info->mti_spec.u.sp_ea.eadata = NULL;
2821         info->mti_spec.u.sp_ea.eadatalen = 0;
2822 }
2823
2824 void mdt_thread_info_fini(struct mdt_thread_info *info)
2825 {
2826         int i;
2827
2828         if (info->mti_object != NULL) {
2829                 mdt_object_put(info->mti_env, info->mti_object);
2830                 info->mti_object = NULL;
2831         }
2832
2833         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
2834                 mdt_lock_handle_fini(&info->mti_lh[i]);
2835         info->mti_env = NULL;
2836         info->mti_pill = NULL;
2837         info->mti_exp = NULL;
2838
2839         if (unlikely(info->mti_big_buf.lb_buf != NULL))
2840                 lu_buf_free(&info->mti_big_buf);
2841 }
2842
2843 struct mdt_thread_info *tsi2mdt_info(struct tgt_session_info *tsi)
2844 {
2845         struct mdt_thread_info  *mti;
2846         struct lustre_capa      *lc;
2847
2848         mti = mdt_th_info(tsi->tsi_env);
2849         LASSERT(mti != NULL);
2850
2851         mdt_thread_info_init(tgt_ses_req(tsi), mti);
2852         if (tsi->tsi_corpus != NULL) {
2853                 struct req_capsule *pill = tsi->tsi_pill;
2854
2855                 mti->mti_object = mdt_obj(tsi->tsi_corpus);
2856                 lu_object_get(tsi->tsi_corpus);
2857
2858                 /*
2859                  * XXX: must be part of tgt_mdt_body_unpack but moved here
2860                  * due to mdt_set_capainfo().
2861                  */
2862                 if (req_capsule_has_field(pill, &RMF_CAPA1, RCL_CLIENT) &&
2863                     req_capsule_get_size(pill, &RMF_CAPA1, RCL_CLIENT) > 0) {
2864                         lc = req_capsule_client_get(pill, &RMF_CAPA1);
2865                         mdt_set_capainfo(mti, 0, &tsi->tsi_mdt_body->fid1, lc);
2866                 }
2867         }
2868         mti->mti_body = tsi->tsi_mdt_body;
2869         mti->mti_dlm_req = tsi->tsi_dlm_req;
2870
2871         return mti;
2872 }
2873
2874 static int mdt_tgt_connect(struct tgt_session_info *tsi)
2875 {
2876         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2877         int                      rc;
2878
2879         ENTRY;
2880
2881         rc = tgt_connect(tsi);
2882         if (rc != 0)
2883                 RETURN(rc);
2884
2885         rc = mdt_init_idmap(tsi);
2886         if (rc != 0)
2887                 GOTO(err, rc);
2888         RETURN(0);
2889 err:
2890         obd_disconnect(class_export_get(req->rq_export));
2891         return rc;
2892 }
2893
2894 enum mdt_it_code {
2895         MDT_IT_OPEN,
2896         MDT_IT_OCREAT,
2897         MDT_IT_CREATE,
2898         MDT_IT_GETATTR,
2899         MDT_IT_READDIR,
2900         MDT_IT_LOOKUP,
2901         MDT_IT_UNLINK,
2902         MDT_IT_TRUNC,
2903         MDT_IT_GETXATTR,
2904         MDT_IT_LAYOUT,
2905         MDT_IT_QUOTA,
2906         MDT_IT_NR
2907 };
2908
2909 static int mdt_intent_getattr(enum mdt_it_code opcode,
2910                               struct mdt_thread_info *info,
2911                               struct ldlm_lock **,
2912                               __u64);
2913
2914 static int mdt_intent_getxattr(enum mdt_it_code opcode,
2915                                 struct mdt_thread_info *info,
2916                                 struct ldlm_lock **lockp,
2917                                 __u64 flags);
2918
2919 static int mdt_intent_layout(enum mdt_it_code opcode,
2920                              struct mdt_thread_info *info,
2921                              struct ldlm_lock **,
2922                              __u64);
2923 static int mdt_intent_reint(enum mdt_it_code opcode,
2924                             struct mdt_thread_info *info,
2925                             struct ldlm_lock **,
2926                             __u64);
2927
2928 static struct mdt_it_flavor {
2929         const struct req_format *it_fmt;
2930         __u32                    it_flags;
2931         int                    (*it_act)(enum mdt_it_code ,
2932                                          struct mdt_thread_info *,
2933                                          struct ldlm_lock **,
2934                                          __u64);
2935         long                     it_reint;
2936 } mdt_it_flavor[] = {
2937         [MDT_IT_OPEN]     = {
2938                 .it_fmt   = &RQF_LDLM_INTENT,
2939                 /*.it_flags = HABEO_REFERO,*/
2940                 .it_flags = 0,
2941                 .it_act   = mdt_intent_reint,
2942                 .it_reint = REINT_OPEN
2943         },
2944         [MDT_IT_OCREAT]   = {
2945                 .it_fmt   = &RQF_LDLM_INTENT,
2946                 /*
2947                  * OCREAT is not a MUTABOR request as if the file
2948                  * already exists.
2949                  * We do the extra check of OBD_CONNECT_RDONLY in
2950                  * mdt_reint_open() when we really need to create
2951                  * the object.
2952                  */
2953                 .it_flags = 0,
2954                 .it_act   = mdt_intent_reint,
2955                 .it_reint = REINT_OPEN
2956         },
2957         [MDT_IT_CREATE]   = {
2958                 .it_fmt   = &RQF_LDLM_INTENT,
2959                 .it_flags = MUTABOR,
2960                 .it_act   = mdt_intent_reint,
2961                 .it_reint = REINT_CREATE
2962         },
2963         [MDT_IT_GETATTR]  = {
2964                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
2965                 .it_flags = HABEO_REFERO,
2966                 .it_act   = mdt_intent_getattr
2967         },
2968         [MDT_IT_READDIR]  = {
2969                 .it_fmt   = NULL,
2970                 .it_flags = 0,
2971                 .it_act   = NULL
2972         },
2973         [MDT_IT_LOOKUP]   = {
2974                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
2975                 .it_flags = HABEO_REFERO,
2976                 .it_act   = mdt_intent_getattr
2977         },
2978         [MDT_IT_UNLINK]   = {
2979                 .it_fmt   = &RQF_LDLM_INTENT_UNLINK,
2980                 .it_flags = MUTABOR,
2981                 .it_act   = NULL,
2982                 .it_reint = REINT_UNLINK
2983         },
2984         [MDT_IT_TRUNC]    = {
2985                 .it_fmt   = NULL,
2986                 .it_flags = MUTABOR,
2987                 .it_act   = NULL
2988         },
2989         [MDT_IT_GETXATTR] = {
2990                 .it_fmt   = &RQF_LDLM_INTENT_GETXATTR,
2991                 .it_flags = HABEO_CORPUS,
2992                 .it_act   = mdt_intent_getxattr
2993         },
2994         [MDT_IT_LAYOUT] = {
2995                 .it_fmt   = &RQF_LDLM_INTENT_LAYOUT,
2996                 .it_flags = 0,
2997                 .it_act   = mdt_intent_layout
2998         }
2999 };
3000
3001 static int
3002 mdt_intent_lock_replace(struct mdt_thread_info *info, struct ldlm_lock **lockp,
3003                         struct ldlm_lock *new_lock, struct mdt_lock_handle *lh,
3004                         __u64 flags)
3005 {
3006         struct ptlrpc_request  *req = mdt_info_req(info);
3007         struct ldlm_lock       *lock = *lockp;
3008
3009         /*
3010          * Get new lock only for cases when possible resent did not find any
3011          * lock.
3012          */
3013         if (new_lock == NULL)
3014                 new_lock = ldlm_handle2lock_long(&lh->mlh_reg_lh, 0);
3015
3016         if (new_lock == NULL && (flags & LDLM_FL_INTENT_ONLY)) {
3017                 lh->mlh_reg_lh.cookie = 0;
3018                 RETURN(0);
3019         }
3020
3021         LASSERTF(new_lock != NULL,
3022                  "lockh "LPX64"\n", lh->mlh_reg_lh.cookie);
3023
3024         /*
3025          * If we've already given this lock to a client once, then we should
3026          * have no readers or writers.  Otherwise, we should have one reader
3027          * _or_ writer ref (which will be zeroed below) before returning the
3028          * lock to a client.
3029          */
3030         if (new_lock->l_export == req->rq_export) {
3031                 LASSERT(new_lock->l_readers + new_lock->l_writers == 0);
3032         } else {
3033                 LASSERT(new_lock->l_export == NULL);
3034                 LASSERT(new_lock->l_readers + new_lock->l_writers == 1);
3035         }
3036
3037         *lockp = new_lock;
3038
3039         if (new_lock->l_export == req->rq_export) {
3040                 /*
3041                  * Already gave this to the client, which means that we
3042                  * reconstructed a reply.
3043                  */
3044                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) &
3045                         MSG_RESENT);
3046                 lh->mlh_reg_lh.cookie = 0;
3047                 RETURN(ELDLM_LOCK_REPLACED);
3048         }
3049
3050         /*
3051          * Fixup the lock to be given to the client.
3052          */
3053         lock_res_and_lock(new_lock);
3054         /* Zero new_lock->l_readers and new_lock->l_writers without triggering
3055          * possible blocking AST. */
3056         while (new_lock->l_readers > 0) {
3057                 lu_ref_del(&new_lock->l_reference, "reader", new_lock);
3058                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
3059                 new_lock->l_readers--;
3060         }
3061         while (new_lock->l_writers > 0) {
3062                 lu_ref_del(&new_lock->l_reference, "writer", new_lock);
3063                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
3064                 new_lock->l_writers--;
3065         }
3066
3067         new_lock->l_export = class_export_lock_get(req->rq_export, new_lock);
3068         new_lock->l_blocking_ast = lock->l_blocking_ast;
3069         new_lock->l_completion_ast = lock->l_completion_ast;
3070         new_lock->l_remote_handle = lock->l_remote_handle;
3071         new_lock->l_flags &= ~LDLM_FL_LOCAL;
3072
3073         unlock_res_and_lock(new_lock);
3074
3075         cfs_hash_add(new_lock->l_export->exp_lock_hash,
3076                      &new_lock->l_remote_handle,
3077                      &new_lock->l_exp_hash);
3078
3079         LDLM_LOCK_RELEASE(new_lock);
3080         lh->mlh_reg_lh.cookie = 0;
3081
3082         RETURN(ELDLM_LOCK_REPLACED);
3083 }
3084
3085 static void mdt_intent_fixup_resent(struct mdt_thread_info *info,
3086                                     struct ldlm_lock *new_lock,
3087                                     struct ldlm_lock **old_lock,
3088                                     struct mdt_lock_handle *lh,
3089                                     enum mdt_it_code opcode)
3090 {
3091         struct ptlrpc_request  *req = mdt_info_req(info);
3092         struct obd_export      *exp = req->rq_export;
3093         struct lustre_handle    remote_hdl;
3094         struct ldlm_request    *dlmreq;
3095         struct ldlm_lock       *lock;
3096
3097         if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))
3098                 return;
3099
3100         dlmreq = req_capsule_client_get(info->mti_pill, &RMF_DLM_REQ);
3101         remote_hdl = dlmreq->lock_handle[0];
3102         /* If the client does not require open lock, it does not need to
3103          * search lock in exp_lock_hash, since the server thread will
3104          * make sure the lock will be released, and the resend request
3105          * can always re-enqueue the lock */
3106         if ((opcode != MDT_IT_OPEN) || (opcode == MDT_IT_OPEN &&
3107             info->mti_spec.sp_cr_flags & MDS_OPEN_LOCK)) {
3108                 /* In the function below, .hs_keycmp resolves to
3109                  * ldlm_export_lock_keycmp() */
3110                 /* coverity[overrun-buffer-val] */
3111                 lock = cfs_hash_lookup(exp->exp_lock_hash, &remote_hdl);
3112                 if (lock) {
3113                         lock_res_and_lock(lock);
3114                         if (lock != new_lock) {
3115                                 lh->mlh_reg_lh.cookie = lock->l_handle.h_cookie;
3116                                 lh->mlh_reg_mode = lock->l_granted_mode;
3117
3118                                 LDLM_DEBUG(lock, "Restoring lock cookie");
3119                                 DEBUG_REQ(D_DLMTRACE, req,
3120                                           "restoring lock cookie "LPX64,
3121                                           lh->mlh_reg_lh.cookie);
3122                                 if (old_lock)
3123                                         *old_lock = LDLM_LOCK_GET(lock);
3124                                 cfs_hash_put(exp->exp_lock_hash,
3125                                              &lock->l_exp_hash);
3126                                 unlock_res_and_lock(lock);
3127                                 return;
3128                         }
3129                         cfs_hash_put(exp->exp_lock_hash, &lock->l_exp_hash);
3130                         unlock_res_and_lock(lock);
3131                 }
3132         }
3133         /*
3134          * If the xid matches, then we know this is a resent request, and allow
3135          * it. (It's probably an OPEN, for which we don't send a lock.
3136          */
3137         if (req_xid_is_last(req))
3138                 return;
3139
3140         /*
3141          * This remote handle isn't enqueued, so we never received or processed
3142          * this request.  Clear MSG_RESENT, because it can be handled like any
3143          * normal request now.
3144          */
3145         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
3146
3147         DEBUG_REQ(D_DLMTRACE, req, "no existing lock with rhandle "LPX64,
3148                   remote_hdl.cookie);
3149 }
3150
3151 static int mdt_intent_getxattr(enum mdt_it_code opcode,
3152                                 struct mdt_thread_info *info,
3153                                 struct ldlm_lock **lockp,
3154                                 __u64 flags)
3155 {
3156         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3157         struct ldlm_reply      *ldlm_rep = NULL;
3158         int rc, grc;
3159
3160         /*
3161          * Initialize lhc->mlh_reg_lh either from a previously granted lock
3162          * (for the resend case) or a new lock. Below we will use it to
3163          * replace the original lock.
3164          */
3165         mdt_intent_fixup_resent(info, *lockp, NULL, lhc, opcode);
3166         if (!lustre_handle_is_used(&lhc->mlh_reg_lh)) {
3167                 mdt_lock_reg_init(lhc, (*lockp)->l_req_mode);
3168                 rc = mdt_object_lock(info, info->mti_object, lhc,
3169                                         MDS_INODELOCK_XATTR,
3170                                         MDT_LOCAL_LOCK);
3171                 if (rc)
3172                         return rc;