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[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, 2014, 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 #include <lustre_nodemap.h>
73
74 mdl_mode_t mdt_mdl_lock_modes[] = {
75         [LCK_MINMODE] = MDL_MINMODE,
76         [LCK_EX]      = MDL_EX,
77         [LCK_PW]      = MDL_PW,
78         [LCK_PR]      = MDL_PR,
79         [LCK_CW]      = MDL_CW,
80         [LCK_CR]      = MDL_CR,
81         [LCK_NL]      = MDL_NL,
82         [LCK_GROUP]   = MDL_GROUP
83 };
84
85 ldlm_mode_t mdt_dlm_lock_modes[] = {
86         [MDL_MINMODE] = LCK_MINMODE,
87         [MDL_EX]      = LCK_EX,
88         [MDL_PW]      = LCK_PW,
89         [MDL_PR]      = LCK_PR,
90         [MDL_CW]      = LCK_CW,
91         [MDL_CR]      = LCK_CR,
92         [MDL_NL]      = LCK_NL,
93         [MDL_GROUP]   = LCK_GROUP
94 };
95
96 static struct mdt_device *mdt_dev(struct lu_device *d);
97 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags);
98
99 static const struct lu_object_operations mdt_obj_ops;
100
101 /* Slab for MDT object allocation */
102 static struct kmem_cache *mdt_object_kmem;
103
104 /* For HSM restore handles */
105 struct kmem_cache *mdt_hsm_cdt_kmem;
106
107 /* For HSM request handles */
108 struct kmem_cache *mdt_hsm_car_kmem;
109
110 static struct lu_kmem_descr mdt_caches[] = {
111         {
112                 .ckd_cache = &mdt_object_kmem,
113                 .ckd_name  = "mdt_obj",
114                 .ckd_size  = sizeof(struct mdt_object)
115         },
116         {
117                 .ckd_cache      = &mdt_hsm_cdt_kmem,
118                 .ckd_name       = "mdt_cdt_restore_handle",
119                 .ckd_size       = sizeof(struct cdt_restore_handle)
120         },
121         {
122                 .ckd_cache      = &mdt_hsm_car_kmem,
123                 .ckd_name       = "mdt_cdt_agent_req",
124                 .ckd_size       = sizeof(struct cdt_agent_req)
125         },
126         {
127                 .ckd_cache = NULL
128         }
129 };
130
131 __u64 mdt_get_disposition(struct ldlm_reply *rep, __u64 op_flag)
132 {
133         if (!rep)
134                 return 0;
135         return rep->lock_policy_res1 & op_flag;
136 }
137
138 void mdt_clear_disposition(struct mdt_thread_info *info,
139                            struct ldlm_reply *rep, __u64 op_flag)
140 {
141         if (info) {
142                 info->mti_opdata &= ~op_flag;
143                 tgt_opdata_clear(info->mti_env, op_flag);
144         }
145         if (rep)
146                 rep->lock_policy_res1 &= ~op_flag;
147 }
148
149 void mdt_set_disposition(struct mdt_thread_info *info,
150                          struct ldlm_reply *rep, __u64 op_flag)
151 {
152         if (info) {
153                 info->mti_opdata |= op_flag;
154                 tgt_opdata_set(info->mti_env, op_flag);
155         }
156         if (rep)
157                 rep->lock_policy_res1 |= op_flag;
158 }
159
160 void mdt_lock_reg_init(struct mdt_lock_handle *lh, ldlm_mode_t lm)
161 {
162         lh->mlh_pdo_hash = 0;
163         lh->mlh_reg_mode = lm;
164         lh->mlh_rreg_mode = lm;
165         lh->mlh_type = MDT_REG_LOCK;
166 }
167
168 void mdt_lock_pdo_init(struct mdt_lock_handle *lh, ldlm_mode_t lock_mode,
169                        const struct lu_name *lname)
170 {
171         lh->mlh_reg_mode = lock_mode;
172         lh->mlh_rreg_mode = lock_mode;
173         lh->mlh_type = MDT_PDO_LOCK;
174
175         if (lu_name_is_valid(lname)) {
176                 lh->mlh_pdo_hash = full_name_hash(lname->ln_name,
177                                                   lname->ln_namelen);
178                 /* XXX Workaround for LU-2856
179                  *
180                  * Zero is a valid return value of full_name_hash, but
181                  * several users of mlh_pdo_hash assume a non-zero
182                  * hash value. We therefore map zero onto an
183                  * arbitrary, but consistent value (1) to avoid
184                  * problems further down the road. */
185                 if (unlikely(lh->mlh_pdo_hash == 0))
186                         lh->mlh_pdo_hash = 1;
187         } else {
188                 lh->mlh_pdo_hash = 0;
189         }
190 }
191
192 static void mdt_lock_pdo_mode(struct mdt_thread_info *info, struct mdt_object *o,
193                               struct mdt_lock_handle *lh)
194 {
195         mdl_mode_t mode;
196         ENTRY;
197
198         /*
199          * Any dir access needs couple of locks:
200          *
201          * 1) on part of dir we gonna take lookup/modify;
202          *
203          * 2) on whole dir to protect it from concurrent splitting and/or to
204          * flush client's cache for readdir().
205          *
206          * so, for a given mode and object this routine decides what lock mode
207          * to use for lock #2:
208          *
209          * 1) if caller's gonna lookup in dir then we need to protect dir from
210          * being splitted only - LCK_CR
211          *
212          * 2) if caller's gonna modify dir then we need to protect dir from
213          * being splitted and to flush cache - LCK_CW
214          *
215          * 3) if caller's gonna modify dir and that dir seems ready for
216          * splitting then we need to protect it from any type of access
217          * (lookup/modify/split) - LCK_EX --bzzz
218          */
219
220         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
221         LASSERT(lh->mlh_pdo_mode == LCK_MINMODE);
222
223         /*
224          * Ask underlaying level its opinion about preferable PDO lock mode
225          * having access type passed as regular lock mode:
226          *
227          * - MDL_MINMODE means that lower layer does not want to specify lock
228          * mode;
229          *
230          * - MDL_NL means that no PDO lock should be taken. This is used in some
231          * cases. Say, for non-splittable directories no need to use PDO locks
232          * at all.
233          */
234         mode = mdo_lock_mode(info->mti_env, mdt_object_child(o),
235                              mdt_dlm_mode2mdl_mode(lh->mlh_reg_mode));
236
237         if (mode != MDL_MINMODE) {
238                 lh->mlh_pdo_mode = mdt_mdl_mode2dlm_mode(mode);
239         } else {
240                 /*
241                  * Lower layer does not want to specify locking mode. We do it
242                  * our selves. No special protection is needed, just flush
243                  * client's cache on modification and allow concurrent
244                  * mondification.
245                  */
246                 switch (lh->mlh_reg_mode) {
247                 case LCK_EX:
248                         lh->mlh_pdo_mode = LCK_EX;
249                         break;
250                 case LCK_PR:
251                         lh->mlh_pdo_mode = LCK_CR;
252                         break;
253                 case LCK_PW:
254                         lh->mlh_pdo_mode = LCK_CW;
255                         break;
256                 default:
257                         CERROR("Not expected lock type (0x%x)\n",
258                                (int)lh->mlh_reg_mode);
259                         LBUG();
260                 }
261         }
262
263         LASSERT(lh->mlh_pdo_mode != LCK_MINMODE);
264         EXIT;
265 }
266
267 static int mdt_getstatus(struct tgt_session_info *tsi)
268 {
269         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
270         struct mdt_device       *mdt = info->mti_mdt;
271         struct mdt_body         *repbody;
272         int                      rc;
273
274         ENTRY;
275
276         rc = mdt_check_ucred(info);
277         if (rc)
278                 GOTO(out, rc = err_serious(rc));
279
280         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETSTATUS_PACK))
281                 GOTO(out, rc = err_serious(-ENOMEM));
282
283         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
284         repbody->mbo_fid1 = mdt->mdt_md_root_fid;
285         repbody->mbo_valid |= OBD_MD_FLID;
286
287         if (tsi->tsi_tgt->lut_mds_capa &&
288             exp_connect_flags(info->mti_exp) & OBD_CONNECT_MDS_CAPA) {
289                 struct mdt_object       *root;
290                 struct lustre_capa      *capa;
291
292                 root = mdt_object_find(info->mti_env, mdt, &repbody->mbo_fid1);
293                 if (IS_ERR(root))
294                         GOTO(out, rc = PTR_ERR(root));
295
296                 capa = req_capsule_server_get(info->mti_pill, &RMF_CAPA1);
297                 LASSERT(capa);
298                 capa->lc_opc = CAPA_OPC_MDS_DEFAULT;
299                 rc = mo_capa_get(info->mti_env, mdt_object_child(root), capa,
300                                  0);
301                 mdt_object_put(info->mti_env, root);
302                 if (rc == 0)
303                         repbody->mbo_valid |= OBD_MD_FLMDSCAPA;
304         }
305         EXIT;
306 out:
307         mdt_thread_info_fini(info);
308         return rc;
309 }
310
311 static int mdt_statfs(struct tgt_session_info *tsi)
312 {
313         struct ptlrpc_request           *req = tgt_ses_req(tsi);
314         struct mdt_thread_info          *info = tsi2mdt_info(tsi);
315         struct md_device                *next = info->mti_mdt->mdt_child;
316         struct ptlrpc_service_part      *svcpt;
317         struct obd_statfs               *osfs;
318         int                             rc;
319
320         ENTRY;
321
322         svcpt = req->rq_rqbd->rqbd_svcpt;
323
324         /* This will trigger a watchdog timeout */
325         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_STATFS_LCW_SLEEP,
326                          (MDT_SERVICE_WATCHDOG_FACTOR *
327                           at_get(&svcpt->scp_at_estimate)) + 1);
328
329         rc = mdt_check_ucred(info);
330         if (rc)
331                 GOTO(out, rc = err_serious(rc));
332
333         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_STATFS_PACK))
334                 GOTO(out, rc = err_serious(-ENOMEM));
335
336         osfs = req_capsule_server_get(info->mti_pill, &RMF_OBD_STATFS);
337         if (!osfs)
338                 GOTO(out, rc = -EPROTO);
339
340         /** statfs information are cached in the mdt_device */
341         if (cfs_time_before_64(info->mti_mdt->mdt_osfs_age,
342                                cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS))) {
343                 /** statfs data is too old, get up-to-date one */
344                 rc = next->md_ops->mdo_statfs(info->mti_env, next, osfs);
345                 if (rc)
346                         GOTO(out, rc);
347                 spin_lock(&info->mti_mdt->mdt_osfs_lock);
348                 info->mti_mdt->mdt_osfs = *osfs;
349                 info->mti_mdt->mdt_osfs_age = cfs_time_current_64();
350                 spin_unlock(&info->mti_mdt->mdt_osfs_lock);
351         } else {
352                 /** use cached statfs data */
353                 spin_lock(&info->mti_mdt->mdt_osfs_lock);
354                 *osfs = info->mti_mdt->mdt_osfs;
355                 spin_unlock(&info->mti_mdt->mdt_osfs_lock);
356         }
357
358         if (rc == 0)
359                 mdt_counter_incr(req, LPROC_MDT_STATFS);
360 out:
361         mdt_thread_info_fini(info);
362         RETURN(rc);
363 }
364
365 #ifdef CONFIG_FS_POSIX_ACL
366 /*
367  * Pack ACL data into the reply. UIDs/GIDs are mapped and filtered by nodemap.
368  *
369  * \param       info    thread info object
370  * \param       repbody reply to pack ACLs into
371  * \param       o       mdt object of file to examine
372  * \param       nodemap nodemap of client to reply to
373  * \retval      0       success
374  * \retval      -errno  error getting or parsing ACL from disk
375  */
376 int mdt_pack_acl2body(struct mdt_thread_info *info, struct mdt_body *repbody,
377                       struct mdt_object *o, struct lu_nodemap *nodemap)
378 {
379         const struct lu_env     *env = info->mti_env;
380         struct md_object        *next = mdt_object_child(o);
381         struct lu_buf           *buf = &info->mti_buf;
382         int rc;
383
384         buf->lb_buf = req_capsule_server_get(info->mti_pill, &RMF_ACL);
385         buf->lb_len = req_capsule_get_size(info->mti_pill, &RMF_ACL,
386                                            RCL_SERVER);
387         if (buf->lb_len == 0)
388                 return 0;
389
390         rc = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_ACCESS);
391         if (rc < 0) {
392                 if (rc == -ENODATA) {
393                         repbody->mbo_aclsize = 0;
394                         repbody->mbo_valid |= OBD_MD_FLACL;
395                         rc = 0;
396                 } else if (rc == -EOPNOTSUPP) {
397                         rc = 0;
398                 } else {
399                         CERROR("%s: unable to read "DFID" ACL: rc = %d\n",
400                                mdt_obd_name(info->mti_mdt),
401                                PFID(mdt_object_fid(o)), rc);
402                 }
403         } else {
404                 rc = nodemap_map_acl(nodemap, buf->lb_buf,
405                                      rc, NODEMAP_FS_TO_CLIENT);
406                 /* if all ACLs mapped out, rc is still >= 0 */
407                 if (rc < 0) {
408                         CERROR("%s: nodemap_map_acl unable to parse "DFID
409                                " ACL: rc = %d\n", mdt_obd_name(info->mti_mdt),
410                                PFID(mdt_object_fid(o)), rc);
411                 } else {
412                         repbody->mbo_aclsize = rc;
413                         repbody->mbo_valid |= OBD_MD_FLACL;
414                         rc = 0;
415                 }
416         }
417         return rc;
418 }
419 #endif
420
421 void mdt_pack_attr2body(struct mdt_thread_info *info, struct mdt_body *b,
422                         const struct lu_attr *attr, const struct lu_fid *fid)
423 {
424         struct md_attr          *ma = &info->mti_attr;
425         struct obd_export       *exp = info->mti_exp;
426         struct lu_nodemap       *nodemap = exp->exp_target_data.ted_nodemap;
427
428         LASSERT(ma->ma_valid & MA_INODE);
429
430         if (attr->la_valid & LA_ATIME) {
431                 b->mbo_atime = attr->la_atime;
432                 b->mbo_valid |= OBD_MD_FLATIME;
433         }
434         if (attr->la_valid & LA_MTIME) {
435                 b->mbo_mtime = attr->la_mtime;
436                 b->mbo_valid |= OBD_MD_FLMTIME;
437         }
438         if (attr->la_valid & LA_CTIME) {
439                 b->mbo_ctime = attr->la_ctime;
440                 b->mbo_valid |= OBD_MD_FLCTIME;
441         }
442         if (attr->la_valid & LA_FLAGS) {
443                 b->mbo_flags = attr->la_flags;
444                 b->mbo_valid |= OBD_MD_FLFLAGS;
445         }
446         if (attr->la_valid & LA_NLINK) {
447                 b->mbo_nlink = attr->la_nlink;
448                 b->mbo_valid |= OBD_MD_FLNLINK;
449         }
450         if (attr->la_valid & LA_UID) {
451                 b->mbo_uid = nodemap_map_id(nodemap, NODEMAP_UID,
452                                             NODEMAP_FS_TO_CLIENT,
453                                             attr->la_uid);
454                 b->mbo_valid |= OBD_MD_FLUID;
455         }
456         if (attr->la_valid & LA_GID) {
457                 b->mbo_gid = nodemap_map_id(nodemap, NODEMAP_GID,
458                                             NODEMAP_FS_TO_CLIENT,
459                                             attr->la_gid);
460                 b->mbo_valid |= OBD_MD_FLGID;
461         }
462         b->mbo_mode = attr->la_mode;
463         if (attr->la_valid & LA_MODE)
464                 b->mbo_valid |= OBD_MD_FLMODE;
465         if (attr->la_valid & LA_TYPE)
466                 b->mbo_valid |= OBD_MD_FLTYPE;
467
468         if (fid != NULL) {
469                 b->mbo_fid1 = *fid;
470                 b->mbo_valid |= OBD_MD_FLID;
471                 CDEBUG(D_INODE, DFID": nlink=%d, mode=%o, valid="LPX64"\n",
472                        PFID(fid), b->mbo_nlink, b->mbo_mode, b->mbo_valid);
473         }
474
475         if (info != NULL)
476                 mdt_body_reverse_idmap(info, b);
477
478         if (!(attr->la_valid & LA_TYPE))
479                 return;
480
481         b->mbo_rdev   = attr->la_rdev;
482         b->mbo_size   = attr->la_size;
483         b->mbo_blocks = attr->la_blocks;
484
485         if (!S_ISREG(attr->la_mode)) {
486                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS | OBD_MD_FLRDEV;
487         } else if (ma->ma_need & MA_LOV && !(ma->ma_valid & MA_LOV)) {
488                 /* means no objects are allocated on osts. */
489                 LASSERT(!(ma->ma_valid & MA_LOV));
490                 /* just ignore blocks occupied by extend attributes on MDS */
491                 b->mbo_blocks = 0;
492                 /* if no object is allocated on osts, the size on mds is valid.
493                  * b=22272 */
494                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
495         } else if ((ma->ma_valid & MA_LOV) && ma->ma_lmm != NULL &&
496                    ma->ma_lmm->lmm_pattern & LOV_PATTERN_F_RELEASED) {
497                 /* A released file stores its size on MDS. */
498                 /* But return 1 block for released file, unless tools like tar
499                  * will consider it fully sparse. (LU-3864)
500                  */
501                 if (unlikely(b->mbo_size == 0))
502                         b->mbo_blocks = 0;
503                 else
504                         b->mbo_blocks = 1;
505                 b->mbo_valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
506         }
507
508         if (fid != NULL && (b->mbo_valid & OBD_MD_FLSIZE))
509                 CDEBUG(D_VFSTRACE, DFID": returning size %llu\n",
510                        PFID(fid), (unsigned long long)b->mbo_size);
511 }
512
513 static inline int mdt_body_has_lov(const struct lu_attr *la,
514                                    const struct mdt_body *body)
515 {
516         return (S_ISREG(la->la_mode) && (body->mbo_valid & OBD_MD_FLEASIZE)) ||
517                (S_ISDIR(la->la_mode) && (body->mbo_valid & OBD_MD_FLDIREA));
518 }
519
520 void mdt_client_compatibility(struct mdt_thread_info *info)
521 {
522         struct mdt_body       *body;
523         struct ptlrpc_request *req = mdt_info_req(info);
524         struct obd_export     *exp = req->rq_export;
525         struct md_attr        *ma = &info->mti_attr;
526         struct lu_attr        *la = &ma->ma_attr;
527         ENTRY;
528
529         if (exp_connect_layout(exp))
530                 /* the client can deal with 16-bit lmm_stripe_count */
531                 RETURN_EXIT;
532
533         body = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
534
535         if (!mdt_body_has_lov(la, body))
536                 RETURN_EXIT;
537
538         /* now we have a reply with a lov for a client not compatible with the
539          * layout lock so we have to clean the layout generation number */
540         if (S_ISREG(la->la_mode))
541                 ma->ma_lmm->lmm_layout_gen = 0;
542         EXIT;
543 }
544
545 static int mdt_attr_get_eabuf_size(struct mdt_thread_info *info,
546                                    struct mdt_object *o)
547 {
548         const struct lu_env *env = info->mti_env;
549         int rc, rc2;
550
551         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
552                           XATTR_NAME_LOV);
553
554         if (rc == -ENODATA)
555                 rc = 0;
556
557         if (rc < 0)
558                 goto out;
559
560         /* Is it a directory? Let's check for the LMV as well */
561         if (S_ISDIR(lu_object_attr(&mdt_object_child(o)->mo_lu))) {
562                 rc2 = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL,
563                                    XATTR_NAME_LMV);
564
565                 if (rc2 == -ENODATA)
566                         rc2 = mo_xattr_get(env, mdt_object_child(o),
567                                            &LU_BUF_NULL,
568                                            XATTR_NAME_DEFAULT_LMV);
569
570                 if ((rc2 < 0 && rc2 != -ENODATA) || (rc2 > rc))
571                         rc = rc2;
572         }
573
574 out:
575         return rc;
576 }
577
578 int mdt_big_xattr_get(struct mdt_thread_info *info, struct mdt_object *o,
579                       const char *name)
580 {
581         const struct lu_env *env = info->mti_env;
582         int rc;
583         ENTRY;
584
585         LASSERT(info->mti_big_lmm_used == 0);
586         rc = mo_xattr_get(env, mdt_object_child(o), &LU_BUF_NULL, name);
587         if (rc < 0)
588                 RETURN(rc);
589
590         /* big_lmm may need to be grown */
591         if (info->mti_big_lmmsize < rc) {
592                 int size = size_roundup_power2(rc);
593
594                 if (info->mti_big_lmmsize > 0) {
595                         /* free old buffer */
596                         LASSERT(info->mti_big_lmm);
597                         OBD_FREE_LARGE(info->mti_big_lmm,
598                                        info->mti_big_lmmsize);
599                         info->mti_big_lmm = NULL;
600                         info->mti_big_lmmsize = 0;
601                 }
602
603                 OBD_ALLOC_LARGE(info->mti_big_lmm, size);
604                 if (info->mti_big_lmm == NULL)
605                         RETURN(-ENOMEM);
606                 info->mti_big_lmmsize = size;
607         }
608         LASSERT(info->mti_big_lmmsize >= rc);
609
610         info->mti_buf.lb_buf = info->mti_big_lmm;
611         info->mti_buf.lb_len = info->mti_big_lmmsize;
612         rc = mo_xattr_get(env, mdt_object_child(o), &info->mti_buf, name);
613
614         RETURN(rc);
615 }
616
617 int mdt_stripe_get(struct mdt_thread_info *info, struct mdt_object *o,
618                    struct md_attr *ma, const char *name)
619 {
620         struct md_object *next = mdt_object_child(o);
621         struct lu_buf    *buf = &info->mti_buf;
622         int rc;
623
624         if (strcmp(name, XATTR_NAME_LOV) == 0) {
625                 buf->lb_buf = ma->ma_lmm;
626                 buf->lb_len = ma->ma_lmm_size;
627                 LASSERT(!(ma->ma_valid & MA_LOV));
628         } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
629                 buf->lb_buf = ma->ma_lmv;
630                 buf->lb_len = ma->ma_lmv_size;
631                 LASSERT(!(ma->ma_valid & MA_LMV));
632         } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
633                 buf->lb_buf = ma->ma_lmv;
634                 buf->lb_len = ma->ma_lmv_size;
635                 LASSERT(!(ma->ma_valid & MA_LMV_DEF));
636         } else {
637                 return -EINVAL;
638         }
639
640         rc = mo_xattr_get(info->mti_env, next, buf, name);
641         if (rc > 0) {
642
643 got:
644                 if (strcmp(name, XATTR_NAME_LOV) == 0) {
645                         if (info->mti_big_lmm_used)
646                                 ma->ma_lmm = info->mti_big_lmm;
647
648                         /* NOT return LOV EA with hole to old client. */
649                         if (unlikely(le32_to_cpu(ma->ma_lmm->lmm_pattern) &
650                                      LOV_PATTERN_F_HOLE) &&
651                             !(exp_connect_flags(info->mti_exp) &
652                               OBD_CONNECT_LFSCK)) {
653                                 return -EIO;
654                         } else {
655                                 ma->ma_lmm_size = rc;
656                                 ma->ma_valid |= MA_LOV;
657                         }
658                 } else if (strcmp(name, XATTR_NAME_LMV) == 0) {
659                         if (info->mti_big_lmm_used)
660                                 ma->ma_lmv = info->mti_big_lmm;
661
662                         ma->ma_lmv_size = rc;
663                         ma->ma_valid |= MA_LMV;
664                 } else if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0) {
665                         ma->ma_lmv_size = rc;
666                         ma->ma_valid |= MA_LMV_DEF;
667                 }
668
669                 /* Update mdt_max_mdsize so all clients will be aware that */
670                 if (info->mti_mdt->mdt_max_mdsize < rc)
671                         info->mti_mdt->mdt_max_mdsize = rc;
672
673                 rc = 0;
674         } else if (rc == -ENODATA) {
675                 /* no LOV EA */
676                 rc = 0;
677         } else if (rc == -ERANGE) {
678                 /* Default LMV has fixed size, so it must be able to fit
679                  * in the original buffer */
680                 if (strcmp(name, XATTR_NAME_DEFAULT_LMV) == 0)
681                         return rc;
682                 rc = mdt_big_xattr_get(info, o, name);
683                 if (rc > 0) {
684                         info->mti_big_lmm_used = 1;
685                         goto got;
686                 }
687         }
688
689         return rc;
690 }
691
692 static int mdt_attr_get_pfid(struct mdt_thread_info *info,
693                              struct mdt_object *o, struct lu_fid *pfid)
694 {
695         struct lu_buf           *buf = &info->mti_buf;
696         struct link_ea_header   *leh;
697         struct link_ea_entry    *lee;
698         int                      rc;
699         ENTRY;
700
701         buf->lb_buf = info->mti_big_lmm;
702         buf->lb_len = info->mti_big_lmmsize;
703         rc = mo_xattr_get(info->mti_env, mdt_object_child(o),
704                           buf, XATTR_NAME_LINK);
705         /* ignore errors, MA_PFID won't be set and it is
706          * up to the caller to treat this as an error */
707         if (rc == -ERANGE || buf->lb_len == 0) {
708                 rc = mdt_big_xattr_get(info, o, XATTR_NAME_LINK);
709                 buf->lb_buf = info->mti_big_lmm;
710                 buf->lb_len = info->mti_big_lmmsize;
711         }
712
713         if (rc < 0)
714                 RETURN(rc);
715         if (rc < sizeof(*leh)) {
716                 CERROR("short LinkEA on "DFID": rc = %d\n",
717                        PFID(mdt_object_fid(o)), rc);
718                 RETURN(-ENODATA);
719         }
720
721         leh = (struct link_ea_header *) buf->lb_buf;
722         lee = (struct link_ea_entry *)(leh + 1);
723         if (leh->leh_magic == __swab32(LINK_EA_MAGIC)) {
724                 leh->leh_magic = LINK_EA_MAGIC;
725                 leh->leh_reccount = __swab32(leh->leh_reccount);
726                 leh->leh_len = __swab64(leh->leh_len);
727         }
728         if (leh->leh_magic != LINK_EA_MAGIC)
729                 RETURN(-EINVAL);
730         if (leh->leh_reccount == 0)
731                 RETURN(-ENODATA);
732
733         memcpy(pfid, &lee->lee_parent_fid, sizeof(*pfid));
734         fid_be_to_cpu(pfid, pfid);
735
736         RETURN(0);
737 }
738
739 int mdt_attr_get_complex(struct mdt_thread_info *info,
740                          struct mdt_object *o, struct md_attr *ma)
741 {
742         const struct lu_env *env = info->mti_env;
743         struct md_object    *next = mdt_object_child(o);
744         struct lu_buf       *buf = &info->mti_buf;
745         int                  need = ma->ma_need;
746         int                  rc = 0, rc2;
747         u32                  mode;
748         ENTRY;
749
750         ma->ma_valid = 0;
751
752         if (mdt_object_exists(o) == 0)
753                 GOTO(out, rc = -ENOENT);
754         mode = lu_object_attr(&next->mo_lu);
755
756         if (need & MA_INODE) {
757                 ma->ma_need = MA_INODE;
758                 rc = mo_attr_get(env, next, ma);
759                 if (rc)
760                         GOTO(out, rc);
761                 ma->ma_valid |= MA_INODE;
762         }
763
764         if (need & MA_PFID) {
765                 rc = mdt_attr_get_pfid(info, o, &ma->ma_pfid);
766                 if (rc == 0)
767                         ma->ma_valid |= MA_PFID;
768                 /* ignore this error, parent fid is not mandatory */
769                 rc = 0;
770         }
771
772         if (need & MA_LOV && (S_ISREG(mode) || S_ISDIR(mode))) {
773                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LOV);
774                 if (rc)
775                         GOTO(out, rc);
776         }
777
778         if (need & MA_LMV && S_ISDIR(mode)) {
779                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_LMV);
780                 if (rc != 0)
781                         GOTO(out, rc);
782         }
783
784         if (need & MA_LMV_DEF && S_ISDIR(mode)) {
785                 rc = mdt_stripe_get(info, o, ma, XATTR_NAME_DEFAULT_LMV);
786                 if (rc != 0)
787                         GOTO(out, rc);
788         }
789
790         if (need & MA_HSM && S_ISREG(mode)) {
791                 buf->lb_buf = info->mti_xattr_buf;
792                 buf->lb_len = sizeof(info->mti_xattr_buf);
793                 CLASSERT(sizeof(struct hsm_attrs) <=
794                          sizeof(info->mti_xattr_buf));
795                 rc2 = mo_xattr_get(info->mti_env, next, buf, XATTR_NAME_HSM);
796                 rc2 = lustre_buf2hsm(info->mti_xattr_buf, rc2, &ma->ma_hsm);
797                 if (rc2 == 0)
798                         ma->ma_valid |= MA_HSM;
799                 else if (rc2 < 0 && rc2 != -ENODATA)
800                         GOTO(out, rc = rc2);
801         }
802
803 #ifdef CONFIG_FS_POSIX_ACL
804         if (need & MA_ACL_DEF && S_ISDIR(mode)) {
805                 buf->lb_buf = ma->ma_acl;
806                 buf->lb_len = ma->ma_acl_size;
807                 rc2 = mo_xattr_get(env, next, buf, XATTR_NAME_ACL_DEFAULT);
808                 if (rc2 > 0) {
809                         ma->ma_acl_size = rc2;
810                         ma->ma_valid |= MA_ACL_DEF;
811                 } else if (rc2 == -ENODATA) {
812                         /* no ACLs */
813                         ma->ma_acl_size = 0;
814                 } else
815                         GOTO(out, rc = rc2);
816         }
817 #endif
818 out:
819         ma->ma_need = need;
820         CDEBUG(D_INODE, "after getattr rc = %d, ma_valid = "LPX64" ma_lmm=%p\n",
821                rc, ma->ma_valid, ma->ma_lmm);
822         RETURN(rc);
823 }
824
825 static int mdt_getattr_internal(struct mdt_thread_info *info,
826                                 struct mdt_object *o, int ma_need)
827 {
828         struct md_object        *next = mdt_object_child(o);
829         const struct mdt_body   *reqbody = info->mti_body;
830         struct ptlrpc_request   *req = mdt_info_req(info);
831         struct md_attr          *ma = &info->mti_attr;
832         struct lu_attr          *la = &ma->ma_attr;
833         struct req_capsule      *pill = info->mti_pill;
834         const struct lu_env     *env = info->mti_env;
835         struct mdt_body         *repbody;
836         struct lu_buf           *buffer = &info->mti_buf;
837         struct obd_export       *exp = info->mti_exp;
838         struct lu_nodemap       *nodemap = exp->exp_target_data.ted_nodemap;
839         int                      rc;
840         int                      is_root;
841         ENTRY;
842
843         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETATTR_PACK))
844                 RETURN(err_serious(-ENOMEM));
845
846         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
847
848         ma->ma_valid = 0;
849
850         if (mdt_object_remote(o)) {
851                 /* This object is located on remote node.*/
852                 /* Return -ENOTSUPP for old client */
853                 if (!mdt_is_dne_client(req->rq_export))
854                         GOTO(out, rc = -ENOTSUPP);
855
856                 repbody->mbo_fid1 = *mdt_object_fid(o);
857                 repbody->mbo_valid = OBD_MD_FLID | OBD_MD_MDS;
858                 GOTO(out, rc = 0);
859         }
860
861         if (reqbody->mbo_eadatasize > 0) {
862                 buffer->lb_buf = req_capsule_server_get(pill, &RMF_MDT_MD);
863                 if (buffer->lb_buf == NULL)
864                         GOTO(out, rc = -EPROTO);
865                 buffer->lb_len = req_capsule_get_size(pill, &RMF_MDT_MD,
866                                                       RCL_SERVER);
867         } else {
868                 buffer->lb_buf = NULL;
869                 buffer->lb_len = 0;
870                 ma_need &= ~(MA_LOV | MA_LMV);
871                 CDEBUG(D_INFO, "%s: RPC from %s: does not need LOVEA.\n",
872                        mdt_obd_name(info->mti_mdt),
873                        req->rq_export->exp_client_uuid.uuid);
874         }
875
876         /* If it is dir object and client require MEA, then we got MEA */
877         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
878             (reqbody->mbo_valid & (OBD_MD_MEA | OBD_MD_DEFAULT_MEA))) {
879                 /* Assumption: MDT_MD size is enough for lmv size. */
880                 ma->ma_lmv = buffer->lb_buf;
881                 ma->ma_lmv_size = buffer->lb_len;
882                 ma->ma_need = MA_INODE;
883                 if (ma->ma_lmv_size > 0) {
884                         if (reqbody->mbo_valid & OBD_MD_MEA)
885                                 ma->ma_need |= MA_LMV;
886                         else if (reqbody->mbo_valid & OBD_MD_DEFAULT_MEA)
887                                 ma->ma_need |= MA_LMV_DEF;
888                 }
889         } else {
890                 ma->ma_lmm = buffer->lb_buf;
891                 ma->ma_lmm_size = buffer->lb_len;
892                 ma->ma_need = MA_INODE | MA_HSM;
893                 if (ma->ma_lmm_size > 0)
894                         ma->ma_need |= MA_LOV;
895         }
896
897         if (S_ISDIR(lu_object_attr(&next->mo_lu)) &&
898             reqbody->mbo_valid & OBD_MD_FLDIREA  &&
899             lustre_msg_get_opc(req->rq_reqmsg) == MDS_GETATTR) {
900                 /* get default stripe info for this dir. */
901                 ma->ma_need |= MA_LOV_DEF;
902         }
903         ma->ma_need |= ma_need;
904
905         rc = mdt_attr_get_complex(info, o, ma);
906         if (unlikely(rc)) {
907                 CERROR("%s: getattr error for "DFID": rc = %d\n",
908                        mdt_obd_name(info->mti_mdt),
909                        PFID(mdt_object_fid(o)), rc);
910                 RETURN(rc);
911         }
912
913         /* if file is released, check if a restore is running */
914         if ((ma->ma_valid & MA_HSM) && (ma->ma_hsm.mh_flags & HS_RELEASED) &&
915             mdt_hsm_restore_is_running(info, mdt_object_fid(o))) {
916                 repbody->mbo_t_state = MS_RESTORE;
917                 repbody->mbo_valid |= OBD_MD_TSTATE;
918         }
919
920         is_root = lu_fid_eq(mdt_object_fid(o), &info->mti_mdt->mdt_md_root_fid);
921
922         /* the Lustre protocol supposes to return default striping
923          * on the user-visible root if explicitly requested */
924         if ((ma->ma_valid & MA_LOV) == 0 && S_ISDIR(la->la_mode) &&
925             (ma->ma_need & MA_LOV_DEF && is_root) && ma->ma_need & MA_LOV) {
926                 struct lu_fid      rootfid;
927                 struct mdt_object *root;
928                 struct mdt_device *mdt = info->mti_mdt;
929
930                 rc = dt_root_get(env, mdt->mdt_bottom, &rootfid);
931                 if (rc)
932                         RETURN(rc);
933                 root = mdt_object_find(env, mdt, &rootfid);
934                 if (IS_ERR(root))
935                         RETURN(PTR_ERR(root));
936                 rc = mdt_stripe_get(info, root, ma, XATTR_NAME_LOV);
937                 mdt_object_put(info->mti_env, root);
938                 if (unlikely(rc)) {
939                         CERROR("%s: getattr error for "DFID": rc = %d\n",
940                                mdt_obd_name(info->mti_mdt),
941                                PFID(mdt_object_fid(o)), rc);
942                         RETURN(rc);
943                 }
944         }
945
946         if (likely(ma->ma_valid & MA_INODE))
947                 mdt_pack_attr2body(info, repbody, la, mdt_object_fid(o));
948         else
949                 RETURN(-EFAULT);
950
951         if (mdt_body_has_lov(la, reqbody)) {
952                 if (ma->ma_valid & MA_LOV) {
953                         LASSERT(ma->ma_lmm_size);
954                         repbody->mbo_eadatasize = ma->ma_lmm_size;
955                         if (S_ISDIR(la->la_mode))
956                                 repbody->mbo_valid |= OBD_MD_FLDIREA;
957                         else
958                                 repbody->mbo_valid |= OBD_MD_FLEASIZE;
959                         mdt_dump_lmm(D_INFO, ma->ma_lmm, repbody->mbo_valid);
960                 }
961                 if (ma->ma_valid & MA_LMV) {
962                         /* Return -ENOTSUPP for old client */
963                         if (!mdt_is_striped_client(req->rq_export))
964                                 RETURN(-ENOTSUPP);
965
966                         LASSERT(S_ISDIR(la->la_mode));
967                         mdt_dump_lmv(D_INFO, ma->ma_lmv);
968                         repbody->mbo_eadatasize = ma->ma_lmv_size;
969                         repbody->mbo_valid |= (OBD_MD_FLDIREA|OBD_MD_MEA);
970                 }
971                 if (ma->ma_valid & MA_LMV_DEF) {
972                         /* Return -ENOTSUPP for old client */
973                         if (!mdt_is_striped_client(req->rq_export))
974                                 RETURN(-ENOTSUPP);
975                         LASSERT(S_ISDIR(la->la_mode));
976                         repbody->mbo_eadatasize = ma->ma_lmv_size;
977                         repbody->mbo_valid |= (OBD_MD_FLDIREA |
978                                                OBD_MD_DEFAULT_MEA);
979                 }
980         } else if (S_ISLNK(la->la_mode) &&
981                    reqbody->mbo_valid & OBD_MD_LINKNAME) {
982                 buffer->lb_buf = ma->ma_lmm;
983                 /* eadatasize from client includes NULL-terminator, so
984                  * there is no need to read it */
985                 buffer->lb_len = reqbody->mbo_eadatasize - 1;
986                 rc = mo_readlink(env, next, buffer);
987                 if (unlikely(rc <= 0)) {
988                         CERROR("%s: readlink failed for "DFID": rc = %d\n",
989                                mdt_obd_name(info->mti_mdt),
990                                PFID(mdt_object_fid(o)), rc);
991                         rc = -EFAULT;
992                 } else {
993                         int print_limit = min_t(int, PAGE_CACHE_SIZE - 128, rc);
994
995                         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READLINK_EPROTO))
996                                 rc -= 2;
997                         repbody->mbo_valid |= OBD_MD_LINKNAME;
998                         /* we need to report back size with NULL-terminator
999                          * because client expects that */
1000                         repbody->mbo_eadatasize = rc + 1;
1001                         if (repbody->mbo_eadatasize != reqbody->mbo_eadatasize)
1002                                 CDEBUG(D_INODE, "%s: Read shorter symlink %d "
1003                                        "on "DFID ", expected %d\n",
1004                                        mdt_obd_name(info->mti_mdt),
1005                                        rc, PFID(mdt_object_fid(o)),
1006                                        reqbody->mbo_eadatasize - 1);
1007                         /* NULL terminate */
1008                         ((char *)ma->ma_lmm)[rc] = 0;
1009
1010                         /* If the total CDEBUG() size is larger than a page, it
1011                          * will print a warning to the console, avoid this by
1012                          * printing just the last part of the symlink. */
1013                         CDEBUG(D_INODE, "symlink dest %s%.*s, len = %d\n",
1014                                print_limit < rc ? "..." : "", print_limit,
1015                                (char *)ma->ma_lmm + rc - print_limit, rc);
1016                         rc = 0;
1017                 }
1018         }
1019
1020         if (reqbody->mbo_valid & OBD_MD_FLMODEASIZE) {
1021                 repbody->mbo_max_cookiesize = 0;
1022                 repbody->mbo_max_mdsize = info->mti_mdt->mdt_max_mdsize;
1023                 repbody->mbo_valid |= OBD_MD_FLMODEASIZE;
1024                 CDEBUG(D_INODE, "I am going to change the MAX_MD_SIZE & "
1025                        "MAX_COOKIE to : %d:%d\n", repbody->mbo_max_mdsize,
1026                        repbody->mbo_max_cookiesize);
1027         }
1028
1029         if (exp_connect_rmtclient(info->mti_exp) &&
1030             reqbody->mbo_valid & OBD_MD_FLRMTPERM) {
1031                 void *buf = req_capsule_server_get(pill, &RMF_ACL);
1032
1033                 /* mdt_getattr_lock only */
1034                 rc = mdt_pack_remote_perm(info, o, buf);
1035                 if (rc) {
1036                         repbody->mbo_valid &= ~OBD_MD_FLRMTPERM;
1037                         repbody->mbo_aclsize = 0;
1038                         RETURN(rc);
1039                 } else {
1040                         repbody->mbo_valid |= OBD_MD_FLRMTPERM;
1041                         repbody->mbo_aclsize = sizeof(struct mdt_remote_perm);
1042                 }
1043         }
1044 #ifdef CONFIG_FS_POSIX_ACL
1045         else if ((exp_connect_flags(req->rq_export) & OBD_CONNECT_ACL) &&
1046                  (reqbody->mbo_valid & OBD_MD_FLACL))
1047                 rc = mdt_pack_acl2body(info, repbody, o, nodemap);
1048 #endif
1049
1050         if (reqbody->mbo_valid & OBD_MD_FLMDSCAPA &&
1051             info->mti_mdt->mdt_lut.lut_mds_capa &&
1052             exp_connect_flags(info->mti_exp) & OBD_CONNECT_MDS_CAPA) {
1053                 struct lustre_capa *capa;
1054
1055                 capa = req_capsule_server_get(pill, &RMF_CAPA1);
1056                 LASSERT(capa);
1057                 capa->lc_opc = CAPA_OPC_MDS_DEFAULT;
1058                 rc = mo_capa_get(env, next, capa, 0);
1059                 if (rc)
1060                         RETURN(rc);
1061                 repbody->mbo_valid |= OBD_MD_FLMDSCAPA;
1062         }
1063
1064 out:
1065         if (rc == 0)
1066                 mdt_counter_incr(req, LPROC_MDT_GETATTR);
1067
1068         RETURN(rc);
1069 }
1070
1071 static int mdt_renew_capa(struct mdt_thread_info *info)
1072 {
1073         struct mdt_object  *obj = info->mti_object;
1074         struct mdt_body    *body;
1075         struct lustre_capa *capa, *c;
1076         int rc;
1077         ENTRY;
1078
1079         /* if object doesn't exist, or server has disabled capability,
1080          * return directly, client will find body->valid OBD_MD_FLOSSCAPA
1081          * flag not set.
1082          */
1083         if (!obj || !info->mti_mdt->mdt_lut.lut_oss_capa ||
1084             !(exp_connect_flags(info->mti_exp) & OBD_CONNECT_OSS_CAPA))
1085                 RETURN(0);
1086
1087         body = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1088         LASSERT(body != NULL);
1089
1090         c = req_capsule_client_get(info->mti_pill, &RMF_CAPA1);
1091         LASSERT(c);
1092
1093         capa = req_capsule_server_get(info->mti_pill, &RMF_CAPA2);
1094         LASSERT(capa);
1095
1096         *capa = *c;
1097         rc = mo_capa_get(info->mti_env, mdt_object_child(obj), capa, 1);
1098         if (rc == 0)
1099                 body->mbo_valid |= OBD_MD_FLOSSCAPA;
1100         RETURN(rc);
1101 }
1102
1103 static int mdt_getattr(struct tgt_session_info *tsi)
1104 {
1105         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1106         struct mdt_object       *obj = info->mti_object;
1107         struct req_capsule      *pill = info->mti_pill;
1108         struct mdt_body         *reqbody;
1109         struct mdt_body         *repbody;
1110         int rc, rc2;
1111         ENTRY;
1112
1113         reqbody = req_capsule_client_get(pill, &RMF_MDT_BODY);
1114         LASSERT(reqbody);
1115
1116         if (reqbody->mbo_valid & OBD_MD_FLOSSCAPA) {
1117                 rc = req_capsule_server_pack(pill);
1118                 if (unlikely(rc))
1119                         RETURN(err_serious(rc));
1120                 rc = mdt_renew_capa(info);
1121                 GOTO(out_shrink, rc);
1122         }
1123
1124         LASSERT(obj != NULL);
1125         LASSERT(lu_object_assert_exists(&obj->mot_obj));
1126
1127         /* Unlike intent case where we need to pre-fill out buffers early on
1128          * in intent policy for ldlm reasons, here we can have a much better
1129          * guess at EA size by just reading it from disk.
1130          * Exceptions are readdir and (missing) directory striping */
1131         /* Readlink */
1132         if (reqbody->mbo_valid & OBD_MD_LINKNAME) {
1133                 /* No easy way to know how long is the symlink, but it cannot
1134                  * be more than PATH_MAX, so we allocate +1 */
1135                 rc = PATH_MAX + 1;
1136
1137         /* A special case for fs ROOT: getattr there might fetch
1138          * default EA for entire fs, not just for this dir!
1139          */
1140         } else if (lu_fid_eq(mdt_object_fid(obj),
1141                              &info->mti_mdt->mdt_md_root_fid) &&
1142                    (reqbody->mbo_valid & OBD_MD_FLDIREA) &&
1143                    (lustre_msg_get_opc(mdt_info_req(info)->rq_reqmsg) ==
1144                                                                  MDS_GETATTR)) {
1145                 /* Should the default strping be bigger, mdt_fix_reply
1146                  * will reallocate */
1147                 rc = DEF_REP_MD_SIZE;
1148         } else {
1149                 /* Read the actual EA size from disk */
1150                 rc = mdt_attr_get_eabuf_size(info, obj);
1151         }
1152
1153         if (rc < 0)
1154                 GOTO(out, rc = err_serious(rc));
1155
1156         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, rc);
1157
1158         rc = req_capsule_server_pack(pill);
1159         if (unlikely(rc != 0))
1160                 GOTO(out, rc = err_serious(rc));
1161
1162         repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1163         LASSERT(repbody != NULL);
1164         repbody->mbo_eadatasize = 0;
1165         repbody->mbo_aclsize = 0;
1166
1167         if (reqbody->mbo_valid & OBD_MD_FLRMTPERM)
1168                 rc = mdt_init_ucred(info, reqbody);
1169         else
1170                 rc = mdt_check_ucred(info);
1171         if (unlikely(rc))
1172                 GOTO(out_shrink, rc);
1173
1174         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
1175
1176         /*
1177          * Don't check capability at all, because rename might getattr for
1178          * remote obj, and at that time no capability is available.
1179          */
1180         mdt_set_capainfo(info, 1, &reqbody->mbo_fid1, BYPASS_CAPA);
1181         rc = mdt_getattr_internal(info, obj, 0);
1182         if (reqbody->mbo_valid & OBD_MD_FLRMTPERM)
1183                 mdt_exit_ucred(info);
1184         EXIT;
1185 out_shrink:
1186         mdt_client_compatibility(info);
1187         rc2 = mdt_fix_reply(info);
1188         if (rc == 0)
1189                 rc = rc2;
1190 out:
1191         mdt_thread_info_fini(info);
1192         return rc;
1193 }
1194
1195 /**
1196  * Exchange MOF_LOV_CREATED flags between two objects after a
1197  * layout swap. No assumption is made on whether o1 or o2 have
1198  * created objects or not.
1199  *
1200  * \param[in,out] o1    First swap layout object
1201  * \param[in,out] o2    Second swap layout object
1202  */
1203 static void mdt_swap_lov_flag(struct mdt_object *o1, struct mdt_object *o2)
1204 {
1205         __u64   o1_flags;
1206
1207         mutex_lock(&o1->mot_lov_mutex);
1208         mutex_lock(&o2->mot_lov_mutex);
1209
1210         o1_flags = o1->mot_flags;
1211         o1->mot_flags = (o1->mot_flags & ~MOF_LOV_CREATED) |
1212                         (o2->mot_flags & MOF_LOV_CREATED);
1213
1214         o2->mot_flags = (o2->mot_flags & ~MOF_LOV_CREATED) |
1215                         (o1_flags & MOF_LOV_CREATED);
1216
1217         mutex_unlock(&o2->mot_lov_mutex);
1218         mutex_unlock(&o1->mot_lov_mutex);
1219 }
1220
1221 static int mdt_swap_layouts(struct tgt_session_info *tsi)
1222 {
1223         struct mdt_thread_info  *info;
1224         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1225         struct obd_export       *exp = req->rq_export;
1226         struct mdt_object       *o1, *o2, *o;
1227         struct mdt_lock_handle  *lh1, *lh2;
1228         struct mdc_swap_layouts *msl;
1229         int                      rc;
1230         ENTRY;
1231
1232         /* client does not support layout lock, so layout swaping
1233          * is disabled.
1234          * FIXME: there is a problem for old clients which don't support
1235          * layout lock yet. If those clients have already opened the file
1236          * they won't be notified at all so that old layout may still be
1237          * used to do IO. This can be fixed after file release is landed by
1238          * doing exclusive open and taking full EX ibits lock. - Jinshan */
1239         if (!exp_connect_layout(exp))
1240                 RETURN(-EOPNOTSUPP);
1241
1242         info = tsi2mdt_info(tsi);
1243
1244         if (info->mti_dlm_req != NULL)
1245                 ldlm_request_cancel(req, info->mti_dlm_req, 0, LATF_SKIP);
1246
1247         if (req_capsule_get_size(info->mti_pill, &RMF_CAPA1, RCL_CLIENT))
1248                 mdt_set_capainfo(info, 0, &info->mti_body->mbo_fid1,
1249                                  req_capsule_client_get(info->mti_pill,
1250                                                         &RMF_CAPA1));
1251
1252         if (req_capsule_get_size(info->mti_pill, &RMF_CAPA2, RCL_CLIENT))
1253                 mdt_set_capainfo(info, 1, &info->mti_body->mbo_fid2,
1254                                  req_capsule_client_get(info->mti_pill,
1255                                                         &RMF_CAPA2));
1256
1257         o1 = info->mti_object;
1258         o = o2 = mdt_object_find(info->mti_env, info->mti_mdt,
1259                                 &info->mti_body->mbo_fid2);
1260         if (IS_ERR(o))
1261                 GOTO(out, rc = PTR_ERR(o));
1262
1263         if (mdt_object_remote(o) || !mdt_object_exists(o)) /* remote object */
1264                 GOTO(put, rc = -ENOENT);
1265
1266         rc = lu_fid_cmp(&info->mti_body->mbo_fid1, &info->mti_body->mbo_fid2);
1267         if (unlikely(rc == 0)) /* same file, you kidding me? no-op. */
1268                 GOTO(put, rc);
1269
1270         if (rc < 0)
1271                 swap(o1, o2);
1272
1273         /* permission check. Make sure the calling process having permission
1274          * to write both files. */
1275         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o1), NULL,
1276                                 MAY_WRITE);
1277         if (rc < 0)
1278                 GOTO(put, rc);
1279
1280         rc = mo_permission(info->mti_env, NULL, mdt_object_child(o2), NULL,
1281                                 MAY_WRITE);
1282         if (rc < 0)
1283                 GOTO(put, rc);
1284
1285         msl = req_capsule_client_get(info->mti_pill, &RMF_SWAP_LAYOUTS);
1286         if (msl == NULL)
1287                 GOTO(put, rc = -EPROTO);
1288
1289         lh1 = &info->mti_lh[MDT_LH_NEW];
1290         mdt_lock_reg_init(lh1, LCK_EX);
1291         lh2 = &info->mti_lh[MDT_LH_OLD];
1292         mdt_lock_reg_init(lh2, LCK_EX);
1293
1294         rc = mdt_object_lock(info, o1, lh1, MDS_INODELOCK_LAYOUT |
1295                              MDS_INODELOCK_XATTR, MDT_LOCAL_LOCK);
1296         if (rc < 0)
1297                 GOTO(put, rc);
1298
1299         rc = mdt_object_lock(info, o2, lh2, MDS_INODELOCK_LAYOUT |
1300                              MDS_INODELOCK_XATTR, MDT_LOCAL_LOCK);
1301         if (rc < 0)
1302                 GOTO(unlock1, rc);
1303
1304         rc = mo_swap_layouts(info->mti_env, mdt_object_child(o1),
1305                              mdt_object_child(o2), msl->msl_flags);
1306         if (rc < 0)
1307                 GOTO(unlock2, rc);
1308
1309         mdt_swap_lov_flag(o1, o2);
1310
1311 unlock2:
1312         mdt_object_unlock(info, o2, lh2, rc);
1313 unlock1:
1314         mdt_object_unlock(info, o1, lh1, rc);
1315 put:
1316         mdt_object_put(info->mti_env, o);
1317 out:
1318         mdt_thread_info_fini(info);
1319         RETURN(rc);
1320 }
1321
1322 static int mdt_raw_lookup(struct mdt_thread_info *info,
1323                           struct mdt_object *parent,
1324                           const struct lu_name *lname,
1325                           struct ldlm_reply *ldlm_rep)
1326 {
1327         struct lu_fid   *child_fid = &info->mti_tmp_fid1;
1328         int              rc;
1329         ENTRY;
1330
1331         LASSERT(!info->mti_cross_ref);
1332
1333         /* Only got the fid of this obj by name */
1334         fid_zero(child_fid);
1335         rc = mdo_lookup(info->mti_env, mdt_object_child(info->mti_object),
1336                         lname, child_fid, &info->mti_spec);
1337         if (rc == 0) {
1338                 struct mdt_body *repbody;
1339
1340                 repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1341                 repbody->mbo_fid1 = *child_fid;
1342                 repbody->mbo_valid = OBD_MD_FLID;
1343                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1344         } else if (rc == -ENOENT) {
1345                 mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1346         }
1347
1348         RETURN(rc);
1349 }
1350
1351 /*
1352  * UPDATE lock should be taken against parent, and be release before exit;
1353  * child_bits lock should be taken against child, and be returned back:
1354  *            (1)normal request should release the child lock;
1355  *            (2)intent request will grant the lock to client.
1356  */
1357 static int mdt_getattr_name_lock(struct mdt_thread_info *info,
1358                                  struct mdt_lock_handle *lhc,
1359                                  __u64 child_bits,
1360                                  struct ldlm_reply *ldlm_rep)
1361 {
1362         struct ptlrpc_request  *req       = mdt_info_req(info);
1363         struct mdt_body        *reqbody   = NULL;
1364         struct mdt_object      *parent    = info->mti_object;
1365         struct mdt_object      *child;
1366         struct lu_fid          *child_fid = &info->mti_tmp_fid1;
1367         struct lu_name         *lname     = NULL;
1368         struct mdt_lock_handle *lhp       = NULL;
1369         struct ldlm_lock       *lock;
1370         bool                    is_resent;
1371         bool                    try_layout;
1372         int                     ma_need = 0;
1373         int                     rc;
1374         ENTRY;
1375
1376         is_resent = lustre_handle_is_used(&lhc->mlh_reg_lh);
1377         LASSERT(ergo(is_resent,
1378                      lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT));
1379
1380         if (parent == NULL)
1381                 RETURN(-ENOENT);
1382
1383         if (info->mti_cross_ref) {
1384                 /* Only getattr on the child. Parent is on another node. */
1385                 mdt_set_disposition(info, ldlm_rep,
1386                                     DISP_LOOKUP_EXECD | DISP_LOOKUP_POS);
1387                 child = parent;
1388                 CDEBUG(D_INODE, "partial getattr_name child_fid = "DFID", "
1389                        "ldlm_rep = %p\n",
1390                        PFID(mdt_object_fid(child)), ldlm_rep);
1391
1392                 rc = mdt_check_resent_lock(info, child, lhc);
1393                 if (rc < 0) {
1394                         RETURN(rc);
1395                 } else if (rc > 0) {
1396                         mdt_lock_handle_init(lhc);
1397                         mdt_lock_reg_init(lhc, LCK_PR);
1398
1399                         /*
1400                          * Object's name is on another MDS, no lookup or layout
1401                          * lock is needed here but update lock is.
1402                          */
1403                         child_bits &= ~(MDS_INODELOCK_LOOKUP |
1404                                         MDS_INODELOCK_LAYOUT);
1405                         child_bits |= MDS_INODELOCK_PERM | MDS_INODELOCK_UPDATE;
1406
1407                         rc = mdt_object_lock(info, child, lhc, child_bits,
1408                                              MDT_LOCAL_LOCK);
1409                         if (rc < 0)
1410                                 RETURN(rc);
1411                 }
1412
1413                 /* Finally, we can get attr for child. */
1414                 if (!mdt_object_exists(child)) {
1415                         LU_OBJECT_DEBUG(D_INFO, info->mti_env,
1416                                         &child->mot_obj,
1417                                         "remote object doesn't exist.\n");
1418                         mdt_object_unlock(info, child, lhc, 1);
1419                         RETURN(-ENOENT);
1420                 }
1421
1422                 mdt_set_capainfo(info, 0, mdt_object_fid(child), BYPASS_CAPA);
1423                 rc = mdt_getattr_internal(info, child, 0);
1424                 if (unlikely(rc != 0))
1425                         mdt_object_unlock(info, child, lhc, 1);
1426
1427                 RETURN(rc);
1428         }
1429
1430         lname = &info->mti_name;
1431         mdt_name_unpack(info->mti_pill, &RMF_NAME, lname, MNF_FIX_ANON);
1432
1433         if (lu_name_is_valid(lname)) {
1434                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DNAME", "
1435                        "ldlm_rep = %p\n", PFID(mdt_object_fid(parent)),
1436                        PNAME(lname), ldlm_rep);
1437         } else {
1438                 reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1439                 if (unlikely(reqbody == NULL))
1440                         RETURN(err_serious(-EPROTO));
1441
1442                 *child_fid = reqbody->mbo_fid2;
1443
1444                 if (unlikely(!fid_is_sane(child_fid)))
1445                         RETURN(err_serious(-EINVAL));
1446
1447                 CDEBUG(D_INODE, "getattr with lock for "DFID"/"DFID", "
1448                        "ldlm_rep = %p\n",
1449                        PFID(mdt_object_fid(parent)),
1450                        PFID(&reqbody->mbo_fid2), ldlm_rep);
1451         }
1452
1453         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_EXECD);
1454
1455         if (unlikely(!mdt_object_exists(parent)) && lu_name_is_valid(lname)) {
1456                 LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1457                                 &parent->mot_obj,
1458                                 "Parent doesn't exist!\n");
1459                 RETURN(-ESTALE);
1460         }
1461
1462         if (mdt_object_remote(parent)) {
1463                 CERROR("%s: parent "DFID" is on remote target\n",
1464                        mdt_obd_name(info->mti_mdt),
1465                        PFID(mdt_object_fid(parent)));
1466                 RETURN(-EIO);
1467         }
1468
1469         if (lu_name_is_valid(lname)) {
1470                 /* Always allow to lookup ".." */
1471                 if (unlikely(lname->ln_namelen == 2 &&
1472                              lname->ln_name[0] == '.' &&
1473                              lname->ln_name[1] == '.'))
1474                         info->mti_spec.sp_permitted = 1;
1475
1476                 if (info->mti_body->mbo_valid == OBD_MD_FLID) {
1477                         rc = mdt_raw_lookup(info, parent, lname, ldlm_rep);
1478
1479                         RETURN(rc);
1480                 }
1481
1482                 /* step 1: lock parent only if parent is a directory */
1483                 if (S_ISDIR(lu_object_attr(&parent->mot_obj))) {
1484                         lhp = &info->mti_lh[MDT_LH_PARENT];
1485                         mdt_lock_pdo_init(lhp, LCK_PR, lname);
1486                         rc = mdt_object_lock(info, parent, lhp,
1487                                              MDS_INODELOCK_UPDATE,
1488                                              MDT_LOCAL_LOCK);
1489                         if (unlikely(rc != 0))
1490                                 RETURN(rc);
1491                 }
1492
1493                 /* step 2: lookup child's fid by name */
1494                 fid_zero(child_fid);
1495                 rc = mdo_lookup(info->mti_env, mdt_object_child(parent), lname,
1496                                 child_fid, &info->mti_spec);
1497                 if (rc == -ENOENT)
1498                         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_NEG);
1499
1500                 if (rc != 0)
1501                         GOTO(out_parent, rc);
1502         }
1503
1504         mdt_set_disposition(info, ldlm_rep, DISP_LOOKUP_POS);
1505
1506         /*
1507          *step 3: find the child object by fid & lock it.
1508          *        regardless if it is local or remote.
1509          *
1510          *Note: LU-3240 (commit 762f2114d282a98ebfa4dbbeea9298a8088ad24e)
1511          *      set parent dir fid the same as child fid in getattr by fid case
1512          *      we should not lu_object_find() the object again, could lead
1513          *      to hung if there is a concurrent unlink destroyed the object.
1514          */
1515         if (lu_fid_eq(mdt_object_fid(parent), child_fid)) {
1516                 mdt_object_get(info->mti_env, parent);
1517                 child = parent;
1518         } else {
1519                 child = mdt_object_find(info->mti_env, info->mti_mdt,
1520                                         child_fid);
1521         }
1522
1523         if (unlikely(IS_ERR(child)))
1524                 GOTO(out_parent, rc = PTR_ERR(child));
1525
1526         rc = mdt_check_resent_lock(info, child, lhc);
1527         if (rc < 0) {
1528                 GOTO(out_child, rc);
1529         } else if (rc > 0) {
1530                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_RESEND, obd_timeout*2);
1531                 mdt_lock_handle_init(lhc);
1532                 mdt_lock_reg_init(lhc, LCK_PR);
1533                 try_layout = false;
1534
1535                 if (!mdt_object_exists(child)) {
1536                         LU_OBJECT_DEBUG(D_INODE, info->mti_env,
1537                                         &child->mot_obj,
1538                                         "Object doesn't exist!\n");
1539                         GOTO(out_child, rc = -ENOENT);
1540                 }
1541
1542                 if (!(child_bits & MDS_INODELOCK_UPDATE) &&
1543                       mdt_object_exists(child) && !mdt_object_remote(child)) {
1544                         struct md_attr *ma = &info->mti_attr;
1545
1546                         ma->ma_valid = 0;
1547                         ma->ma_need = MA_INODE;
1548                         rc = mdt_attr_get_complex(info, child, ma);
1549                         if (unlikely(rc != 0))
1550                                 GOTO(out_child, rc);
1551
1552                         /* If the file has not been changed for some time, we
1553                          * return not only a LOOKUP lock, but also an UPDATE
1554                          * lock and this might save us RPC on later STAT. For
1555                          * directories, it also let negative dentry cache start
1556                          * working for this dir. */
1557                         if (ma->ma_valid & MA_INODE &&
1558                             ma->ma_attr.la_valid & LA_CTIME &&
1559                             info->mti_mdt->mdt_namespace->ns_ctime_age_limit +
1560                                 ma->ma_attr.la_ctime < cfs_time_current_sec())
1561                                 child_bits |= MDS_INODELOCK_UPDATE;
1562                 }
1563
1564                 /* layout lock must be granted in a best-effort way
1565                  * for IT operations */
1566                 LASSERT(!(child_bits & MDS_INODELOCK_LAYOUT));
1567                 if (!OBD_FAIL_CHECK(OBD_FAIL_MDS_NO_LL_GETATTR) &&
1568                     exp_connect_layout(info->mti_exp) &&
1569                     S_ISREG(lu_object_attr(&child->mot_obj)) &&
1570                     !mdt_object_remote(child) && ldlm_rep != NULL) {
1571                         /* try to grant layout lock for regular file. */
1572                         try_layout = true;
1573                 }
1574
1575                 rc = 0;
1576                 if (try_layout) {
1577                         child_bits |= MDS_INODELOCK_LAYOUT;
1578                         /* try layout lock, it may fail to be granted due to
1579                          * contention at LOOKUP or UPDATE */
1580                         if (!mdt_object_lock_try(info, child, lhc, child_bits,
1581                                                  MDT_CROSS_LOCK)) {
1582                                 child_bits &= ~MDS_INODELOCK_LAYOUT;
1583                                 LASSERT(child_bits != 0);
1584                                 rc = mdt_object_lock(info, child, lhc,
1585                                                 child_bits, MDT_CROSS_LOCK);
1586                         } else {
1587                                 ma_need |= MA_LOV;
1588                         }
1589                 } else {
1590                         /* Do not enqueue the UPDATE lock from MDT(cross-MDT),
1591                          * client will enqueue the lock to the remote MDT */
1592                         if (mdt_object_remote(child))
1593                                 child_bits &= ~MDS_INODELOCK_UPDATE;
1594                         rc = mdt_object_lock(info, child, lhc, child_bits,
1595                                                 MDT_CROSS_LOCK);
1596                 }
1597                 if (unlikely(rc != 0))
1598                         GOTO(out_child, rc);
1599         }
1600
1601         lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
1602
1603         /* finally, we can get attr for child. */
1604         mdt_set_capainfo(info, 1, child_fid, BYPASS_CAPA);
1605         rc = mdt_getattr_internal(info, child, ma_need);
1606         if (unlikely(rc != 0)) {
1607                 mdt_object_unlock(info, child, lhc, 1);
1608         } else if (lock) {
1609                 /* Debugging code. */
1610                 LDLM_DEBUG(lock, "Returning lock to client");
1611                 LASSERTF(fid_res_name_eq(mdt_object_fid(child),
1612                                          &lock->l_resource->lr_name),
1613                          "Lock res_id: "DLDLMRES", fid: "DFID"\n",
1614                          PLDLMRES(lock->l_resource),
1615                          PFID(mdt_object_fid(child)));
1616         }
1617         if (lock)
1618                 LDLM_LOCK_PUT(lock);
1619
1620         EXIT;
1621 out_child:
1622         mdt_object_put(info->mti_env, child);
1623 out_parent:
1624         if (lhp)
1625                 mdt_object_unlock(info, parent, lhp, 1);
1626         return rc;
1627 }
1628
1629 /* normal handler: should release the child lock */
1630 static int mdt_getattr_name(struct tgt_session_info *tsi)
1631 {
1632         struct mdt_thread_info  *info = tsi2mdt_info(tsi);
1633         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_CHILD];
1634         struct mdt_body        *reqbody;
1635         struct mdt_body        *repbody;
1636         int rc, rc2;
1637         ENTRY;
1638
1639         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
1640         LASSERT(reqbody != NULL);
1641         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
1642         LASSERT(repbody != NULL);
1643
1644         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
1645         repbody->mbo_eadatasize = 0;
1646         repbody->mbo_aclsize = 0;
1647
1648         rc = mdt_init_ucred(info, reqbody);
1649         if (unlikely(rc))
1650                 GOTO(out_shrink, rc);
1651
1652         rc = mdt_getattr_name_lock(info, lhc, MDS_INODELOCK_UPDATE, NULL);
1653         if (lustre_handle_is_used(&lhc->mlh_reg_lh)) {
1654                 ldlm_lock_decref(&lhc->mlh_reg_lh, lhc->mlh_reg_mode);
1655                 lhc->mlh_reg_lh.cookie = 0;
1656         }
1657         mdt_exit_ucred(info);
1658         EXIT;
1659 out_shrink:
1660         mdt_client_compatibility(info);
1661         rc2 = mdt_fix_reply(info);
1662         if (rc == 0)
1663                 rc = rc2;
1664         mdt_thread_info_fini(info);
1665         return rc;
1666 }
1667
1668 static int mdt_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
1669                          void *karg, void *uarg);
1670
1671 static int mdt_set_info(struct tgt_session_info *tsi)
1672 {
1673         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1674         char                    *key;
1675         void                    *val;
1676         int                      keylen, vallen, rc = 0;
1677
1678         ENTRY;
1679
1680         key = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_KEY);
1681         if (key == NULL) {
1682                 DEBUG_REQ(D_HA, req, "no set_info key");
1683                 RETURN(err_serious(-EFAULT));
1684         }
1685
1686         keylen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_KEY,
1687                                       RCL_CLIENT);
1688
1689         val = req_capsule_client_get(tsi->tsi_pill, &RMF_SETINFO_VAL);
1690         if (val == NULL) {
1691                 DEBUG_REQ(D_HA, req, "no set_info val");
1692                 RETURN(err_serious(-EFAULT));
1693         }
1694
1695         vallen = req_capsule_get_size(tsi->tsi_pill, &RMF_SETINFO_VAL,
1696                                       RCL_CLIENT);
1697
1698         /* Swab any part of val you need to here */
1699         if (KEY_IS(KEY_READ_ONLY)) {
1700                 spin_lock(&req->rq_export->exp_lock);
1701                 if (*(__u32 *)val)
1702                         *exp_connect_flags_ptr(req->rq_export) |=
1703                                 OBD_CONNECT_RDONLY;
1704                 else
1705                         *exp_connect_flags_ptr(req->rq_export) &=
1706                                 ~OBD_CONNECT_RDONLY;
1707                 spin_unlock(&req->rq_export->exp_lock);
1708         } else if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
1709                 struct changelog_setinfo *cs = val;
1710
1711                 if (vallen != sizeof(*cs)) {
1712                         CERROR("%s: bad changelog_clear setinfo size %d\n",
1713                                tgt_name(tsi->tsi_tgt), vallen);
1714                         RETURN(-EINVAL);
1715                 }
1716                 if (ptlrpc_req_need_swab(req)) {
1717                         __swab64s(&cs->cs_recno);
1718                         __swab32s(&cs->cs_id);
1719                 }
1720
1721                 rc = mdt_iocontrol(OBD_IOC_CHANGELOG_CLEAR, req->rq_export,
1722                                    vallen, val, NULL);
1723         } else {
1724                 RETURN(-EINVAL);
1725         }
1726         RETURN(rc);
1727 }
1728
1729 static int mdt_readpage(struct tgt_session_info *tsi)
1730 {
1731         struct mdt_thread_info  *info = mdt_th_info(tsi->tsi_env);
1732         struct mdt_object       *object = mdt_obj(tsi->tsi_corpus);
1733         struct lu_rdpg          *rdpg = &info->mti_u.rdpg.mti_rdpg;
1734         const struct mdt_body   *reqbody = tsi->tsi_mdt_body;
1735         struct mdt_body         *repbody;
1736         int                      rc;
1737         int                      i;
1738
1739         ENTRY;
1740
1741         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_READPAGE_PACK))
1742                 RETURN(err_serious(-ENOMEM));
1743
1744         repbody = req_capsule_server_get(tsi->tsi_pill, &RMF_MDT_BODY);
1745         if (repbody == NULL || reqbody == NULL)
1746                 RETURN(err_serious(-EFAULT));
1747
1748         /*
1749          * prepare @rdpg before calling lower layers and transfer itself. Here
1750          * reqbody->size contains offset of where to start to read and
1751          * reqbody->nlink contains number bytes to read.
1752          */
1753         rdpg->rp_hash = reqbody->mbo_size;
1754         if (rdpg->rp_hash != reqbody->mbo_size) {
1755                 CERROR("Invalid hash: "LPX64" != "LPX64"\n",
1756                        rdpg->rp_hash, reqbody->mbo_size);
1757                 RETURN(-EFAULT);
1758         }
1759
1760         rdpg->rp_attrs = reqbody->mbo_mode;
1761         if (exp_connect_flags(tsi->tsi_exp) & OBD_CONNECT_64BITHASH)
1762                 rdpg->rp_attrs |= LUDA_64BITHASH;
1763         rdpg->rp_count  = min_t(unsigned int, reqbody->mbo_nlink,
1764                                 exp_max_brw_size(tsi->tsi_exp));
1765         rdpg->rp_npages = (rdpg->rp_count + PAGE_CACHE_SIZE - 1) >>
1766                           PAGE_CACHE_SHIFT;
1767         OBD_ALLOC(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1768         if (rdpg->rp_pages == NULL)
1769                 RETURN(-ENOMEM);
1770
1771         for (i = 0; i < rdpg->rp_npages; ++i) {
1772                 rdpg->rp_pages[i] = alloc_page(GFP_IOFS);
1773                 if (rdpg->rp_pages[i] == NULL)
1774                         GOTO(free_rdpg, rc = -ENOMEM);
1775         }
1776
1777         /* call lower layers to fill allocated pages with directory data */
1778         rc = mo_readpage(tsi->tsi_env, mdt_object_child(object), rdpg);
1779         if (rc < 0)
1780                 GOTO(free_rdpg, rc);
1781
1782         /* send pages to client */
1783         rc = tgt_sendpage(tsi, rdpg, rc);
1784
1785         EXIT;
1786 free_rdpg:
1787
1788         for (i = 0; i < rdpg->rp_npages; i++)
1789                 if (rdpg->rp_pages[i] != NULL)
1790                         __free_page(rdpg->rp_pages[i]);
1791         OBD_FREE(rdpg->rp_pages, rdpg->rp_npages * sizeof rdpg->rp_pages[0]);
1792
1793         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE))
1794                 RETURN(0);
1795
1796         return rc;
1797 }
1798
1799 static int mdt_reint_internal(struct mdt_thread_info *info,
1800                               struct mdt_lock_handle *lhc,
1801                               __u32 op)
1802 {
1803         struct req_capsule      *pill = info->mti_pill;
1804         struct mdt_body         *repbody;
1805         int                      rc = 0, rc2;
1806
1807         ENTRY;
1808
1809         rc = mdt_reint_unpack(info, op);
1810         if (rc != 0) {
1811                 CERROR("Can't unpack reint, rc %d\n", rc);
1812                 RETURN(err_serious(rc));
1813         }
1814
1815         /* for replay (no_create) lmm is not needed, client has it already */
1816         if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1817                 req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
1818                                      DEF_REP_MD_SIZE);
1819
1820         /* llog cookies are always 0, the field is kept for compatibility */
1821         if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
1822                 req_capsule_set_size(pill, &RMF_LOGCOOKIES, RCL_SERVER, 0);
1823
1824         rc = req_capsule_server_pack(pill);
1825         if (rc != 0) {
1826                 CERROR("Can't pack response, rc %d\n", rc);
1827                 RETURN(err_serious(rc));
1828         }
1829
1830         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_SERVER)) {
1831                 repbody = req_capsule_server_get(pill, &RMF_MDT_BODY);
1832                 LASSERT(repbody);
1833                 repbody->mbo_eadatasize = 0;
1834                 repbody->mbo_aclsize = 0;
1835         }
1836
1837         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_REINT_DELAY, 10);
1838
1839         /* for replay no cookkie / lmm need, because client have this already */
1840         if (info->mti_spec.no_create)
1841                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
1842                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER, 0);
1843
1844         rc = mdt_init_ucred_reint(info);
1845         if (rc)
1846                 GOTO(out_shrink, rc);
1847
1848         rc = mdt_fix_attr_ucred(info, op);
1849         if (rc != 0)
1850                 GOTO(out_ucred, rc = err_serious(rc));
1851
1852         if (mdt_check_resent(info, mdt_reconstruct, lhc)) {
1853                 DEBUG_REQ(D_INODE, mdt_info_req(info), "resent opt.");
1854                 rc = lustre_msg_get_status(mdt_info_req(info)->rq_repmsg);
1855                 GOTO(out_ucred, rc);
1856         }
1857         rc = mdt_reint_rec(info, lhc);
1858         EXIT;
1859 out_ucred:
1860         mdt_exit_ucred(info);
1861 out_shrink:
1862         mdt_client_compatibility(info);
1863         rc2 = mdt_fix_reply(info);
1864         if (rc == 0)
1865                 rc = rc2;
1866         return rc;
1867 }
1868
1869 static long mdt_reint_opcode(struct ptlrpc_request *req,
1870                              const struct req_format **fmt)
1871 {
1872         struct mdt_device       *mdt;
1873         struct mdt_rec_reint    *rec;
1874         long                     opc;
1875
1876         rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
1877         if (rec != NULL) {
1878                 opc = rec->rr_opcode;
1879                 DEBUG_REQ(D_INODE, req, "reint opt = %ld", opc);
1880                 if (opc < REINT_MAX && fmt[opc] != NULL)
1881                         req_capsule_extend(&req->rq_pill, fmt[opc]);
1882                 else {
1883                         mdt = mdt_exp2dev(req->rq_export);
1884                         CERROR("%s: Unsupported opcode '%ld' from client '%s':"
1885                                " rc = %d\n", req->rq_export->exp_obd->obd_name,
1886                                opc, mdt->mdt_ldlm_client->cli_name, -EFAULT);
1887                         opc = err_serious(-EFAULT);
1888                 }
1889         } else {
1890                 opc = err_serious(-EFAULT);
1891         }
1892         return opc;
1893 }
1894
1895 static int mdt_reint(struct tgt_session_info *tsi)
1896 {
1897         long opc;
1898         int  rc;
1899         static const struct req_format *reint_fmts[REINT_MAX] = {
1900                 [REINT_SETATTR]  = &RQF_MDS_REINT_SETATTR,
1901                 [REINT_CREATE]   = &RQF_MDS_REINT_CREATE,
1902                 [REINT_LINK]     = &RQF_MDS_REINT_LINK,
1903                 [REINT_UNLINK]   = &RQF_MDS_REINT_UNLINK,
1904                 [REINT_RENAME]   = &RQF_MDS_REINT_RENAME,
1905                 [REINT_OPEN]     = &RQF_MDS_REINT_OPEN,
1906                 [REINT_SETXATTR] = &RQF_MDS_REINT_SETXATTR,
1907                 [REINT_RMENTRY]  = &RQF_MDS_REINT_UNLINK,
1908                 [REINT_MIGRATE]  = &RQF_MDS_REINT_RENAME
1909         };
1910
1911         ENTRY;
1912
1913         opc = mdt_reint_opcode(tgt_ses_req(tsi), reint_fmts);
1914         if (opc >= 0) {
1915                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
1916                 /*
1917                  * No lock possible here from client to pass it to reint code
1918                  * path.
1919                  */
1920                 rc = mdt_reint_internal(info, NULL, opc);
1921                 mdt_thread_info_fini(info);
1922         } else {
1923                 rc = opc;
1924         }
1925
1926         tsi->tsi_reply_fail_id = OBD_FAIL_MDS_REINT_NET_REP;
1927         RETURN(rc);
1928 }
1929
1930 /* this should sync the whole device */
1931 static int mdt_device_sync(const struct lu_env *env, struct mdt_device *mdt)
1932 {
1933         struct dt_device *dt = mdt->mdt_bottom;
1934         int rc;
1935         ENTRY;
1936
1937         rc = dt->dd_ops->dt_sync(env, dt);
1938         RETURN(rc);
1939 }
1940
1941 /* this should sync this object */
1942 static int mdt_object_sync(struct mdt_thread_info *info)
1943 {
1944         struct md_object *next;
1945         int rc;
1946         ENTRY;
1947
1948         if (!mdt_object_exists(info->mti_object)) {
1949                 CWARN("%s: non existing object "DFID": rc = %d\n",
1950                       mdt_obd_name(info->mti_mdt),
1951                       PFID(mdt_object_fid(info->mti_object)), -ESTALE);
1952                 RETURN(-ESTALE);
1953         }
1954         next = mdt_object_child(info->mti_object);
1955         rc = mo_object_sync(info->mti_env, next);
1956
1957         RETURN(rc);
1958 }
1959
1960 static int mdt_sync(struct tgt_session_info *tsi)
1961 {
1962         struct ptlrpc_request   *req = tgt_ses_req(tsi);
1963         struct req_capsule      *pill = tsi->tsi_pill;
1964         struct mdt_body         *body;
1965         int                      rc;
1966
1967         ENTRY;
1968
1969         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SYNC_PACK))
1970                 RETURN(err_serious(-ENOMEM));
1971
1972         if (fid_seq(&tsi->tsi_mdt_body->mbo_fid1) == 0) {
1973                 rc = mdt_device_sync(tsi->tsi_env, mdt_exp2dev(tsi->tsi_exp));
1974         } else {
1975                 struct mdt_thread_info *info = tsi2mdt_info(tsi);
1976
1977                 /* sync an object */
1978                 rc = mdt_object_sync(info);
1979                 if (rc == 0) {
1980                         const struct lu_fid *fid;
1981                         struct lu_attr *la = &info->mti_attr.ma_attr;
1982
1983                         info->mti_attr.ma_need = MA_INODE;
1984                         info->mti_attr.ma_valid = 0;
1985                         rc = mdt_attr_get_complex(info, info->mti_object,
1986                                                   &info->mti_attr);
1987                         if (rc == 0) {
1988                                 body = req_capsule_server_get(pill,
1989                                                               &RMF_MDT_BODY);
1990                                 fid = mdt_object_fid(info->mti_object);
1991                                 mdt_pack_attr2body(info, body, la, fid);
1992                         }
1993                 }
1994                 mdt_thread_info_fini(info);
1995         }
1996         if (rc == 0)
1997                 mdt_counter_incr(req, LPROC_MDT_SYNC);
1998
1999         RETURN(rc);
2000 }
2001
2002 /*
2003  * Handle quota control requests to consult current usage/limit, but also
2004  * to configure quota enforcement
2005  */
2006 static int mdt_quotactl(struct tgt_session_info *tsi)
2007 {
2008         struct obd_export       *exp  = tsi->tsi_exp;
2009         struct req_capsule      *pill = tsi->tsi_pill;
2010         struct obd_quotactl     *oqctl, *repoqc;
2011         int                      id, rc;
2012         struct mdt_device       *mdt = mdt_exp2dev(exp);
2013         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2014         struct lu_nodemap       *nodemap = exp->exp_target_data.ted_nodemap;
2015         ENTRY;
2016
2017         oqctl = req_capsule_client_get(pill, &RMF_OBD_QUOTACTL);
2018         if (oqctl == NULL)
2019                 RETURN(err_serious(-EPROTO));
2020
2021         rc = req_capsule_server_pack(pill);
2022         if (rc)
2023                 RETURN(err_serious(rc));
2024
2025         switch (oqctl->qc_cmd) {
2026         case Q_QUOTACHECK:
2027         case LUSTRE_Q_INVALIDATE:
2028         case LUSTRE_Q_FINVALIDATE:
2029         case Q_QUOTAON:
2030         case Q_QUOTAOFF:
2031         case Q_INITQUOTA:
2032                 /* deprecated, not used any more */
2033                 RETURN(-EOPNOTSUPP);
2034                 /* master quotactl */
2035         case Q_SETINFO:
2036         case Q_SETQUOTA:
2037                 if (!nodemap_can_setquota(nodemap))
2038                         RETURN(-EPERM);
2039         case Q_GETINFO:
2040         case Q_GETQUOTA:
2041                 if (qmt == NULL)
2042                         RETURN(-EOPNOTSUPP);
2043                 /* slave quotactl */
2044         case Q_GETOINFO:
2045         case Q_GETOQUOTA:
2046                 break;
2047         default:
2048                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2049                 RETURN(-EFAULT);
2050         }
2051
2052         /* map uid/gid for remote client */
2053         id = oqctl->qc_id;
2054         if (exp_connect_rmtclient(exp)) {
2055                 struct lustre_idmap_table *idmap;
2056
2057                 idmap = exp->exp_mdt_data.med_idmap;
2058
2059                 if (unlikely(oqctl->qc_cmd != Q_GETQUOTA &&
2060                              oqctl->qc_cmd != Q_GETINFO))
2061                         RETURN(-EPERM);
2062
2063                 if (oqctl->qc_type == USRQUOTA)
2064                         id = lustre_idmap_lookup_uid(NULL, idmap, 0,
2065                                                      oqctl->qc_id);
2066                 else if (oqctl->qc_type == GRPQUOTA)
2067                         id = lustre_idmap_lookup_gid(NULL, idmap, 0,
2068                                                      oqctl->qc_id);
2069                 else
2070                         RETURN(-EINVAL);
2071
2072                 if (id == CFS_IDMAP_NOTFOUND) {
2073                         CDEBUG(D_QUOTA, "no mapping for id %u\n", oqctl->qc_id);
2074                         RETURN(-EACCES);
2075                 }
2076         }
2077
2078         if (oqctl->qc_type == USRQUOTA)
2079                 id = nodemap_map_id(nodemap, NODEMAP_UID,
2080                                     NODEMAP_CLIENT_TO_FS, id);
2081         else if (oqctl->qc_type == GRPQUOTA)
2082                 id = nodemap_map_id(nodemap, NODEMAP_UID,
2083                                     NODEMAP_CLIENT_TO_FS, id);
2084
2085         repoqc = req_capsule_server_get(pill, &RMF_OBD_QUOTACTL);
2086         if (repoqc == NULL)
2087                 RETURN(err_serious(-EFAULT));
2088
2089         if (oqctl->qc_id != id)
2090                 swap(oqctl->qc_id, id);
2091
2092         switch (oqctl->qc_cmd) {
2093
2094         case Q_GETINFO:
2095         case Q_SETINFO:
2096         case Q_SETQUOTA:
2097         case Q_GETQUOTA:
2098                 /* forward quotactl request to QMT */
2099                 rc = qmt_hdls.qmth_quotactl(tsi->tsi_env, qmt, oqctl);
2100                 break;
2101
2102         case Q_GETOINFO:
2103         case Q_GETOQUOTA:
2104                 /* slave quotactl */
2105                 rc = lquotactl_slv(tsi->tsi_env, tsi->tsi_tgt->lut_bottom,
2106                                    oqctl);
2107                 break;
2108
2109         default:
2110                 CERROR("Unsupported quotactl command: %d\n", oqctl->qc_cmd);
2111                 RETURN(-EFAULT);
2112         }
2113
2114         if (oqctl->qc_id != id)
2115                 swap(oqctl->qc_id, id);
2116
2117         *repoqc = *oqctl;
2118         RETURN(rc);
2119 }
2120
2121 /** clone llog ctxt from child (mdd)
2122  * This allows remote llog (replicator) access.
2123  * We can either pass all llog RPCs (eg mdt_llog_create) on to child where the
2124  * context was originally set up, or we can handle them directly.
2125  * I choose the latter, but that means I need any llog
2126  * contexts set up by child to be accessable by the mdt.  So we clone the
2127  * context into our context list here.
2128  */
2129 static int mdt_llog_ctxt_clone(const struct lu_env *env, struct mdt_device *mdt,
2130                                int idx)
2131 {
2132         struct md_device  *next = mdt->mdt_child;
2133         struct llog_ctxt *ctxt;
2134         int rc;
2135
2136         if (!llog_ctxt_null(mdt2obd_dev(mdt), idx))
2137                 return 0;
2138
2139         rc = next->md_ops->mdo_llog_ctxt_get(env, next, idx, (void **)&ctxt);
2140         if (rc || ctxt == NULL) {
2141                 return 0;
2142         }
2143
2144         rc = llog_group_set_ctxt(&mdt2obd_dev(mdt)->obd_olg, ctxt, idx);
2145         if (rc)
2146                 CERROR("Can't set mdt ctxt %d\n", rc);
2147
2148         return rc;
2149 }
2150
2151 static int mdt_llog_ctxt_unclone(const struct lu_env *env,
2152                                  struct mdt_device *mdt, int idx)
2153 {
2154         struct llog_ctxt *ctxt;
2155
2156         ctxt = llog_get_context(mdt2obd_dev(mdt), idx);
2157         if (ctxt == NULL)
2158                 return 0;
2159         /* Put once for the get we just did, and once for the clone */
2160         llog_ctxt_put(ctxt);
2161         llog_ctxt_put(ctxt);
2162         return 0;
2163 }
2164
2165 /*
2166  * sec context handlers
2167  */
2168 static int mdt_sec_ctx_handle(struct tgt_session_info *tsi)
2169 {
2170         int rc;
2171
2172         rc = mdt_handle_idmap(tsi);
2173         if (unlikely(rc)) {
2174                 struct ptlrpc_request   *req = tgt_ses_req(tsi);
2175                 __u32                    opc;
2176
2177                 opc = lustre_msg_get_opc(req->rq_reqmsg);
2178                 if (opc == SEC_CTX_INIT || opc == SEC_CTX_INIT_CONT)
2179                         sptlrpc_svc_ctx_invalidate(req);
2180         }
2181
2182         CFS_FAIL_TIMEOUT(OBD_FAIL_SEC_CTX_HDL_PAUSE, cfs_fail_val);
2183
2184         return rc;
2185 }
2186
2187 /*
2188  * quota request handlers
2189  */
2190 static int mdt_quota_dqacq(struct tgt_session_info *tsi)
2191 {
2192         struct mdt_device       *mdt = mdt_exp2dev(tsi->tsi_exp);
2193         struct lu_device        *qmt = mdt->mdt_qmt_dev;
2194         int                      rc;
2195         ENTRY;
2196
2197         if (qmt == NULL)
2198                 RETURN(err_serious(-EOPNOTSUPP));
2199
2200         rc = qmt_hdls.qmth_dqacq(tsi->tsi_env, qmt, tgt_ses_req(tsi));
2201         RETURN(rc);
2202 }
2203
2204 struct mdt_object *mdt_object_new(const struct lu_env *env,
2205                                   struct mdt_device *d,
2206                                   const struct lu_fid *f)
2207 {
2208         struct lu_object_conf conf = { .loc_flags = LOC_F_NEW };
2209         struct lu_object *o;
2210         struct mdt_object *m;
2211         ENTRY;
2212
2213         CDEBUG(D_INFO, "Allocate object for "DFID"\n", PFID(f));
2214         o = lu_object_find(env, &d->mdt_lu_dev, f, &conf);
2215         if (unlikely(IS_ERR(o)))
2216                 m = (struct mdt_object *)o;
2217         else
2218                 m = mdt_obj(o);
2219         RETURN(m);
2220 }
2221
2222 struct mdt_object *mdt_object_find(const struct lu_env *env,
2223                                    struct mdt_device *d,
2224                                    const struct lu_fid *f)
2225 {
2226         struct lu_object *o;
2227         struct mdt_object *m;
2228         ENTRY;
2229
2230         CDEBUG(D_INFO, "Find object for "DFID"\n", PFID(f));
2231         o = lu_object_find(env, &d->mdt_lu_dev, f, NULL);
2232         if (unlikely(IS_ERR(o)))
2233                 m = (struct mdt_object *)o;
2234         else
2235                 m = mdt_obj(o);
2236
2237         RETURN(m);
2238 }
2239
2240 /**
2241  * Asyncronous commit for mdt device.
2242  *
2243  * Pass asynchonous commit call down the MDS stack.
2244  *
2245  * \param env environment
2246  * \param mdt the mdt device
2247  */
2248 static void mdt_device_commit_async(const struct lu_env *env,
2249                                     struct mdt_device *mdt)
2250 {
2251         struct dt_device *dt = mdt->mdt_bottom;
2252         int rc;
2253
2254         rc = dt->dd_ops->dt_commit_async(env, dt);
2255         if (unlikely(rc != 0))
2256                 CWARN("%s: async commit start failed: rc = %d\n",
2257                       mdt_obd_name(mdt), rc);
2258 }
2259
2260 /**
2261  * Mark the lock as "synchonous".
2262  *
2263  * Mark the lock to deffer transaction commit to the unlock time.
2264  *
2265  * \param lock the lock to mark as "synchonous"
2266  *
2267  * \see mdt_is_lock_sync
2268  * \see mdt_save_lock
2269  */
2270 static inline void mdt_set_lock_sync(struct ldlm_lock *lock)
2271 {
2272         lock->l_ast_data = (void*)1;
2273 }
2274
2275 /**
2276  * Check whehter the lock "synchonous" or not.
2277  *
2278  * \param lock the lock to check
2279  * \retval 1 the lock is "synchonous"
2280  * \retval 0 the lock isn't "synchronous"
2281  *
2282  * \see mdt_set_lock_sync
2283  * \see mdt_save_lock
2284  */
2285 static inline int mdt_is_lock_sync(struct ldlm_lock *lock)
2286 {
2287         return lock->l_ast_data != NULL;
2288 }
2289
2290 /**
2291  * Blocking AST for mdt locks.
2292  *
2293  * Starts transaction commit if in case of COS lock conflict or
2294  * deffers such a commit to the mdt_save_lock.
2295  *
2296  * \param lock the lock which blocks a request or cancelling lock
2297  * \param desc unused
2298  * \param data unused
2299  * \param flag indicates whether this cancelling or blocking callback
2300  * \retval 0
2301  * \see ldlm_blocking_ast_nocheck
2302  */
2303 int mdt_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2304                      void *data, int flag)
2305 {
2306         struct obd_device *obd = ldlm_lock_to_ns(lock)->ns_obd;
2307         struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
2308         int rc;
2309         ENTRY;
2310
2311         if (flag == LDLM_CB_CANCELING)
2312                 RETURN(0);
2313         lock_res_and_lock(lock);
2314         if (lock->l_blocking_ast != mdt_blocking_ast) {
2315                 unlock_res_and_lock(lock);
2316                 RETURN(0);
2317         }
2318         if (mdt_cos_is_enabled(mdt) &&
2319             lock->l_req_mode & (LCK_PW | LCK_EX) &&
2320             lock->l_blocking_lock != NULL &&
2321             lock->l_client_cookie != lock->l_blocking_lock->l_client_cookie) {
2322                 mdt_set_lock_sync(lock);
2323         }
2324         rc = ldlm_blocking_ast_nocheck(lock);
2325
2326         /* There is no lock conflict if l_blocking_lock == NULL,
2327          * it indicates a blocking ast sent from ldlm_lock_decref_internal
2328          * when the last reference to a local lock was released */
2329         if (lock->l_req_mode == LCK_COS && lock->l_blocking_lock != NULL) {
2330                 struct lu_env env;
2331
2332                 rc = lu_env_init(&env, LCT_LOCAL);
2333                 if (unlikely(rc != 0))
2334                         CWARN("%s: lu_env initialization failed, cannot "
2335                               "start asynchronous commit: rc = %d\n",
2336                               obd->obd_name, rc);
2337                 else
2338                         mdt_device_commit_async(&env, mdt);
2339                 lu_env_fini(&env);
2340         }
2341         RETURN(rc);
2342 }
2343
2344 /* Used for cross-MDT lock */
2345 int mdt_remote_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2346                             void *data, int flag)
2347 {
2348         struct lustre_handle lockh;
2349         int               rc;
2350
2351         switch (flag) {
2352         case LDLM_CB_BLOCKING:
2353                 ldlm_lock2handle(lock, &lockh);
2354                 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
2355                 if (rc < 0) {
2356                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
2357                         RETURN(rc);
2358                 }
2359                 break;
2360         case LDLM_CB_CANCELING:
2361                 LDLM_DEBUG(lock, "Revoke remote lock\n");
2362                 break;
2363         default:
2364                 LBUG();
2365         }
2366         RETURN(0);
2367 }
2368
2369 int mdt_check_resent_lock(struct mdt_thread_info *info,
2370                           struct mdt_object *mo,
2371                           struct mdt_lock_handle *lhc)
2372 {
2373         /* the lock might already be gotten in ldlm_handle_enqueue() */
2374         if (unlikely(lustre_handle_is_used(&lhc->mlh_reg_lh))) {
2375                 struct ptlrpc_request *req = mdt_info_req(info);
2376                 struct ldlm_lock      *lock;
2377
2378                 lock = ldlm_handle2lock(&lhc->mlh_reg_lh);
2379                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT);
2380                 if (lock == NULL) {
2381                         /* Lock is pinned by ldlm_handle_enqueue0() as it is
2382                          * a resend case, however, it could be already destroyed
2383                          * due to client eviction or a raced cancel RPC. */
2384                         LDLM_DEBUG_NOLOCK("Invalid lock handle "LPX64"\n",
2385                                           lhc->mlh_reg_lh.cookie);
2386                         RETURN(-ESTALE);
2387                 }
2388
2389                 if (!fid_res_name_eq(mdt_object_fid(mo),
2390                                      &lock->l_resource->lr_name)) {
2391                         CWARN("%s: Although resent, but still not "
2392                               "get child lock:"DFID"\n",
2393                               info->mti_exp->exp_obd->obd_name,
2394                               PFID(mdt_object_fid(mo)));
2395                         LDLM_LOCK_PUT(lock);
2396                         RETURN(-EPROTO);
2397                 }
2398                 LDLM_LOCK_PUT(lock);
2399                 return 0;
2400         }
2401         return 1;
2402 }
2403
2404 int mdt_remote_object_lock(struct mdt_thread_info *mti,
2405                            struct mdt_object *o, const struct lu_fid *fid,
2406                            struct lustre_handle *lh, ldlm_mode_t mode,
2407                            __u64 ibits)
2408 {
2409         struct ldlm_enqueue_info *einfo = &mti->mti_einfo;
2410         ldlm_policy_data_t *policy = &mti->mti_policy;
2411         struct ldlm_res_id *res_id = &mti->mti_res_id;
2412         int rc = 0;
2413         ENTRY;
2414
2415         LASSERT(mdt_object_remote(o));
2416
2417         LASSERT(ibits == MDS_INODELOCK_UPDATE);
2418
2419         fid_build_reg_res_name(fid, res_id);
2420
2421         memset(einfo, 0, sizeof(*einfo));
2422         einfo->ei_type = LDLM_IBITS;
2423         einfo->ei_mode = mode;
2424         einfo->ei_cb_bl = mdt_remote_blocking_ast;
2425         einfo->ei_cb_cp = ldlm_completion_ast;
2426         einfo->ei_enq_slave = 0;
2427         einfo->ei_res_id = res_id;
2428
2429         memset(policy, 0, sizeof(*policy));
2430         policy->l_inodebits.bits = ibits;
2431
2432         rc = mo_object_lock(mti->mti_env, mdt_object_child(o), lh, einfo,
2433                             policy);
2434         RETURN(rc);
2435 }
2436
2437 static int mdt_object_local_lock(struct mdt_thread_info *info,
2438                                  struct mdt_object *o,
2439                                  struct mdt_lock_handle *lh, __u64 ibits,
2440                                  bool nonblock, int locality)
2441 {
2442         struct ldlm_namespace *ns = info->mti_mdt->mdt_namespace;
2443         ldlm_policy_data_t *policy = &info->mti_policy;
2444         struct ldlm_res_id *res_id = &info->mti_res_id;
2445         __u64 dlmflags;
2446         int rc;
2447         ENTRY;
2448
2449         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2450         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2451         LASSERT(lh->mlh_reg_mode != LCK_MINMODE);
2452         LASSERT(lh->mlh_type != MDT_NUL_LOCK);
2453
2454         /* Only enqueue LOOKUP lock for remote object */
2455         if (mdt_object_remote(o))
2456                 LASSERT(ibits == MDS_INODELOCK_LOOKUP);
2457
2458         if (lh->mlh_type == MDT_PDO_LOCK) {
2459                 /* check for exists after object is locked */
2460                 if (mdt_object_exists(o) == 0) {
2461                         /* Non-existent object shouldn't have PDO lock */
2462                         RETURN(-ESTALE);
2463                 } else {
2464                         /* Non-dir object shouldn't have PDO lock */
2465                         if (!S_ISDIR(lu_object_attr(&o->mot_obj)))
2466                                 RETURN(-ENOTDIR);
2467                 }
2468         }
2469
2470         memset(policy, 0, sizeof(*policy));
2471         fid_build_reg_res_name(mdt_object_fid(o), res_id);
2472
2473         dlmflags = LDLM_FL_ATOMIC_CB;
2474         if (nonblock)
2475                 dlmflags |= LDLM_FL_BLOCK_NOWAIT;
2476
2477         /*
2478          * Take PDO lock on whole directory and build correct @res_id for lock
2479          * on part of directory.
2480          */
2481         if (lh->mlh_pdo_hash != 0) {
2482                 LASSERT(lh->mlh_type == MDT_PDO_LOCK);
2483                 mdt_lock_pdo_mode(info, o, lh);
2484                 if (lh->mlh_pdo_mode != LCK_NL) {
2485                         /*
2486                          * Do not use LDLM_FL_LOCAL_ONLY for parallel lock, it
2487                          * is never going to be sent to client and we do not
2488                          * want it slowed down due to possible cancels.
2489                          */
2490                         policy->l_inodebits.bits = MDS_INODELOCK_UPDATE;
2491                         rc = mdt_fid_lock(ns, &lh->mlh_pdo_lh, lh->mlh_pdo_mode,
2492                                           policy, res_id, dlmflags,
2493                                           info->mti_exp == NULL ? NULL :
2494                                           &info->mti_exp->exp_handle.h_cookie);
2495                         if (unlikely(rc != 0))
2496                                 GOTO(out_unlock, rc);
2497                 }
2498
2499                 /*
2500                  * Finish res_id initializing by name hash marking part of
2501                  * directory which is taking modification.
2502                  */
2503                 res_id->name[LUSTRE_RES_ID_HSH_OFF] = lh->mlh_pdo_hash;
2504         }
2505
2506         policy->l_inodebits.bits = ibits;
2507
2508         /*
2509          * Use LDLM_FL_LOCAL_ONLY for this lock. We do not know yet if it is
2510          * going to be sent to client. If it is - mdt_intent_policy() path will
2511          * fix it up and turn FL_LOCAL flag off.
2512          */
2513         rc = mdt_fid_lock(ns, &lh->mlh_reg_lh, lh->mlh_reg_mode, policy,
2514                           res_id, LDLM_FL_LOCAL_ONLY | dlmflags,
2515                           info->mti_exp == NULL ? NULL :
2516                           &info->mti_exp->exp_handle.h_cookie);
2517 out_unlock:
2518         if (rc != 0)
2519                 mdt_object_unlock(info, o, lh, 1);
2520         else if (unlikely(OBD_FAIL_PRECHECK(OBD_FAIL_MDS_PDO_LOCK)) &&
2521                    lh->mlh_pdo_hash != 0 &&
2522                    (lh->mlh_reg_mode == LCK_PW || lh->mlh_reg_mode == LCK_EX))
2523                 OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_PDO_LOCK, 15);
2524
2525         RETURN(rc);
2526 }
2527
2528 static int
2529 mdt_object_lock_internal(struct mdt_thread_info *info, struct mdt_object *o,
2530                          struct mdt_lock_handle *lh, __u64 ibits,
2531                          bool nonblock, int locality)
2532 {
2533         int rc;
2534         ENTRY;
2535
2536         if (!mdt_object_remote(o))
2537                 return mdt_object_local_lock(info, o, lh, ibits, nonblock,
2538                                              locality);
2539
2540         if (locality == MDT_LOCAL_LOCK) {
2541                 CERROR("%s: try to get local lock for remote object"
2542                        DFID".\n", mdt_obd_name(info->mti_mdt),
2543                        PFID(mdt_object_fid(o)));
2544                 RETURN(-EPROTO);
2545         }
2546
2547         /* XXX do not support PERM/LAYOUT/XATTR lock for remote object yet */
2548         ibits &= ~(MDS_INODELOCK_PERM | MDS_INODELOCK_LAYOUT |
2549                    MDS_INODELOCK_XATTR);
2550         if (ibits & MDS_INODELOCK_UPDATE) {
2551                 /* Sigh, PDO needs to enqueue 2 locks right now, but
2552                  * enqueue RPC can only request 1 lock, to avoid extra
2553                  * RPC, so it will instead enqueue EX lock for remote
2554                  * object anyway XXX*/
2555                 if (lh->mlh_type == MDT_PDO_LOCK &&
2556                     lh->mlh_pdo_hash != 0) {
2557                         CDEBUG(D_INFO, "%s: "DFID" convert PDO lock to"
2558                                "EX lock.\n", mdt_obd_name(info->mti_mdt),
2559                                PFID(mdt_object_fid(o)));
2560                         lh->mlh_pdo_hash = 0;
2561                         lh->mlh_rreg_mode = LCK_EX;
2562                         lh->mlh_type = MDT_REG_LOCK;
2563                 }
2564                 rc = mdt_remote_object_lock(info, o, mdt_object_fid(o),
2565                                             &lh->mlh_rreg_lh,
2566                                             lh->mlh_rreg_mode,
2567                                             MDS_INODELOCK_UPDATE);
2568                 if (rc != ELDLM_OK)
2569                         RETURN(rc);
2570         }
2571
2572         /* Only enqueue LOOKUP lock for remote object */
2573         if (ibits & MDS_INODELOCK_LOOKUP) {
2574                 rc = mdt_object_local_lock(info, o, lh,
2575                                            MDS_INODELOCK_LOOKUP,
2576                                            nonblock, locality);
2577                 if (rc != ELDLM_OK)
2578                         RETURN(rc);
2579         }
2580
2581         RETURN(0);
2582 }
2583
2584 int mdt_object_lock(struct mdt_thread_info *info, struct mdt_object *o,
2585                     struct mdt_lock_handle *lh, __u64 ibits, int locality)
2586 {
2587         return mdt_object_lock_internal(info, o, lh, ibits, false, locality);
2588 }
2589
2590 int mdt_object_lock_try(struct mdt_thread_info *info, struct mdt_object *o,
2591                         struct mdt_lock_handle *lh, __u64 ibits, int locality)
2592 {
2593         struct mdt_lock_handle tmp = *lh;
2594         int rc;
2595
2596         rc = mdt_object_lock_internal(info, o, &tmp, ibits, true, locality);
2597         if (rc == 0)
2598                 *lh = tmp;
2599
2600         return rc == 0;
2601 }
2602
2603 /**
2604  * Save a lock within request object.
2605  *
2606  * Keep the lock referenced until whether client ACK or transaction
2607  * commit happens or release the lock immediately depending on input
2608  * parameters. If COS is ON, a write lock is converted to COS lock
2609  * before saving.
2610  *
2611  * \param info thead info object
2612  * \param h lock handle
2613  * \param mode lock mode
2614  * \param decref force immediate lock releasing
2615  */
2616 static
2617 void mdt_save_lock(struct mdt_thread_info *info, struct lustre_handle *h,
2618                    ldlm_mode_t mode, int decref)
2619 {
2620         ENTRY;
2621
2622         if (lustre_handle_is_used(h)) {
2623                 if (decref || !info->mti_has_trans ||
2624                     !(mode & (LCK_PW | LCK_EX))){
2625                         mdt_fid_unlock(h, mode);
2626                 } else {
2627                         struct mdt_device *mdt = info->mti_mdt;
2628                         struct ldlm_lock *lock = ldlm_handle2lock(h);
2629                         struct ptlrpc_request *req = mdt_info_req(info);
2630                         int no_ack = 0;
2631
2632                         LASSERTF(lock != NULL, "no lock for cookie "LPX64"\n",
2633                                  h->cookie);
2634                         /* there is no request if mdt_object_unlock() is called
2635                          * from mdt_export_cleanup()->mdt_add_dirty_flag() */
2636                         if (likely(req != NULL)) {
2637                                 CDEBUG(D_HA, "request = %p reply state = %p"
2638                                        " transno = "LPD64"\n", req,
2639                                        req->rq_reply_state, req->rq_transno);
2640                                 if (mdt_cos_is_enabled(mdt)) {
2641                                         no_ack = 1;
2642                                         ldlm_lock_downgrade(lock, LCK_COS);
2643                                         mode = LCK_COS;
2644                                 }
2645                                 ptlrpc_save_lock(req, h, mode, no_ack);
2646                         } else {
2647                                 ldlm_lock_decref(h, mode);
2648                         }
2649                         if (mdt_is_lock_sync(lock)) {
2650                                 CDEBUG(D_HA, "found sync-lock,"
2651                                        " async commit started\n");
2652                                 mdt_device_commit_async(info->mti_env,
2653                                                         mdt);
2654                         }
2655                         LDLM_LOCK_PUT(lock);
2656                 }
2657                 h->cookie = 0ull;
2658         }
2659
2660         EXIT;
2661 }
2662
2663 /**
2664  * Unlock mdt object.
2665  *
2666  * Immeditely release the regular lock and the PDO lock or save the
2667  * lock in reqeuest and keep them referenced until client ACK or
2668  * transaction commit.
2669  *
2670  * \param info thread info object
2671  * \param o mdt object
2672  * \param lh mdt lock handle referencing regular and PDO locks
2673  * \param decref force immediate lock releasing
2674  */
2675 void mdt_object_unlock(struct mdt_thread_info *info, struct mdt_object *o,
2676                        struct mdt_lock_handle *lh, int decref)
2677 {
2678         ENTRY;
2679
2680         mdt_save_lock(info, &lh->mlh_pdo_lh, lh->mlh_pdo_mode, decref);
2681         mdt_save_lock(info, &lh->mlh_reg_lh, lh->mlh_reg_mode, decref);
2682
2683         if (lustre_handle_is_used(&lh->mlh_rreg_lh))
2684                 ldlm_lock_decref(&lh->mlh_rreg_lh, lh->mlh_rreg_mode);
2685
2686         EXIT;
2687 }
2688
2689 struct mdt_object *mdt_object_find_lock(struct mdt_thread_info *info,
2690                                         const struct lu_fid *f,
2691                                         struct mdt_lock_handle *lh,
2692                                         __u64 ibits)
2693 {
2694         struct mdt_object *o;
2695
2696         o = mdt_object_find(info->mti_env, info->mti_mdt, f);
2697         if (!IS_ERR(o)) {
2698                 int rc;
2699
2700                 rc = mdt_object_lock(info, o, lh, ibits,
2701                                      MDT_LOCAL_LOCK);
2702                 if (rc != 0) {
2703                         mdt_object_put(info->mti_env, o);
2704                         o = ERR_PTR(rc);
2705                 }
2706         }
2707         return o;
2708 }
2709
2710 void mdt_object_unlock_put(struct mdt_thread_info * info,
2711                            struct mdt_object * o,
2712                            struct mdt_lock_handle *lh,
2713                            int decref)
2714 {
2715         mdt_object_unlock(info, o, lh, decref);
2716         mdt_object_put(info->mti_env, o);
2717 }
2718
2719 /*
2720  * Generic code handling requests that have struct mdt_body passed in:
2721  *
2722  *  - extract mdt_body from request and save it in @info, if present;
2723  *
2724  *  - create lu_object, corresponding to the fid in mdt_body, and save it in
2725  *  @info;
2726  *
2727  *  - if HABEO_CORPUS flag is set for this request type check whether object
2728  *  actually exists on storage (lu_object_exists()).
2729  *
2730  */
2731 static int mdt_body_unpack(struct mdt_thread_info *info, __u32 flags)
2732 {
2733         const struct mdt_body    *body;
2734         struct mdt_object        *obj;
2735         const struct lu_env      *env;
2736         struct req_capsule       *pill;
2737         int                       rc;
2738         ENTRY;
2739
2740         env = info->mti_env;
2741         pill = info->mti_pill;
2742
2743         body = info->mti_body = req_capsule_client_get(pill, &RMF_MDT_BODY);
2744         if (body == NULL)
2745                 RETURN(-EFAULT);
2746
2747         if (!(body->mbo_valid & OBD_MD_FLID))
2748                 RETURN(0);
2749
2750         if (!fid_is_sane(&body->mbo_fid1)) {
2751                 CERROR("Invalid fid: "DFID"\n", PFID(&body->mbo_fid1));
2752                 RETURN(-EINVAL);
2753         }
2754
2755         /*
2756          * Do not get size or any capa fields before we check that request
2757          * contains capa actually. There are some requests which do not, for
2758          * instance MDS_IS_SUBDIR.
2759          */
2760         if (req_capsule_has_field(pill, &RMF_CAPA1, RCL_CLIENT) &&
2761             req_capsule_get_size(pill, &RMF_CAPA1, RCL_CLIENT))
2762                 mdt_set_capainfo(info, 0, &body->mbo_fid1,
2763                                  req_capsule_client_get(pill, &RMF_CAPA1));
2764
2765         obj = mdt_object_find(env, info->mti_mdt, &body->mbo_fid1);
2766         if (!IS_ERR(obj)) {
2767                 if ((flags & HABEO_CORPUS) &&
2768                     !mdt_object_exists(obj)) {
2769                         mdt_object_put(env, obj);
2770                         /* for capability renew ENOENT will be handled in
2771                          * mdt_renew_capa */
2772                         if (body->mbo_valid & OBD_MD_FLOSSCAPA)
2773                                 rc = 0;
2774                         else
2775                                 rc = -ENOENT;
2776                 } else {
2777                         info->mti_object = obj;
2778                         rc = 0;
2779                 }
2780         } else
2781                 rc = PTR_ERR(obj);
2782
2783         RETURN(rc);
2784 }
2785
2786 static int mdt_unpack_req_pack_rep(struct mdt_thread_info *info, __u32 flags)
2787 {
2788         struct req_capsule *pill = info->mti_pill;
2789         int rc;
2790         ENTRY;
2791
2792         if (req_capsule_has_field(pill, &RMF_MDT_BODY, RCL_CLIENT))
2793                 rc = mdt_body_unpack(info, flags);
2794         else
2795                 rc = 0;
2796
2797         if (rc == 0 && (flags & HABEO_REFERO)) {
2798                 /* Pack reply. */
2799                 if (req_capsule_has_field(pill, &RMF_MDT_MD, RCL_SERVER))
2800                         req_capsule_set_size(pill, &RMF_MDT_MD, RCL_SERVER,
2801                                              DEF_REP_MD_SIZE);
2802                 if (req_capsule_has_field(pill, &RMF_LOGCOOKIES, RCL_SERVER))
2803                         req_capsule_set_size(pill, &RMF_LOGCOOKIES,
2804                                              RCL_SERVER, 0);
2805
2806                 rc = req_capsule_server_pack(pill);
2807         }
2808         RETURN(rc);
2809 }
2810
2811 static int mdt_init_capa_ctxt(const struct lu_env *env, struct mdt_device *m)
2812 {
2813         struct md_device *next = m->mdt_child;
2814
2815         return next->md_ops->mdo_init_capa_ctxt(env, next,
2816                                                 m->mdt_lut.lut_mds_capa,
2817                                                 m->mdt_capa_timeout,
2818                                                 m->mdt_capa_alg,
2819                                                 m->mdt_capa_keys);
2820 }
2821
2822 void mdt_lock_handle_init(struct mdt_lock_handle *lh)
2823 {
2824         lh->mlh_type = MDT_NUL_LOCK;
2825         lh->mlh_reg_lh.cookie = 0ull;
2826         lh->mlh_reg_mode = LCK_MINMODE;
2827         lh->mlh_pdo_lh.cookie = 0ull;
2828         lh->mlh_pdo_mode = LCK_MINMODE;
2829         lh->mlh_rreg_lh.cookie = 0ull;
2830         lh->mlh_rreg_mode = LCK_MINMODE;
2831 }
2832
2833 void mdt_lock_handle_fini(struct mdt_lock_handle *lh)
2834 {
2835         LASSERT(!lustre_handle_is_used(&lh->mlh_reg_lh));
2836         LASSERT(!lustre_handle_is_used(&lh->mlh_pdo_lh));
2837 }
2838
2839 /*
2840  * Initialize fields of struct mdt_thread_info. Other fields are left in
2841  * uninitialized state, because it's too expensive to zero out whole
2842  * mdt_thread_info (> 1K) on each request arrival.
2843  */
2844 void mdt_thread_info_init(struct ptlrpc_request *req,
2845                           struct mdt_thread_info *info)
2846 {
2847         int i;
2848
2849         info->mti_pill = &req->rq_pill;
2850
2851         /* lock handle */
2852         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
2853                 mdt_lock_handle_init(&info->mti_lh[i]);
2854
2855         /* mdt device: it can be NULL while CONNECT */
2856         if (req->rq_export) {
2857                 info->mti_mdt = mdt_dev(req->rq_export->exp_obd->obd_lu_dev);
2858                 info->mti_exp = req->rq_export;
2859         } else
2860                 info->mti_mdt = NULL;
2861         info->mti_env = req->rq_svc_thread->t_env;
2862         info->mti_transno = lustre_msg_get_transno(req->rq_reqmsg);
2863
2864         memset(&info->mti_attr, 0, sizeof(info->mti_attr));
2865         info->mti_big_buf = LU_BUF_NULL;
2866         info->mti_body = NULL;
2867         info->mti_object = NULL;
2868         info->mti_dlm_req = NULL;
2869         info->mti_has_trans = 0;
2870         info->mti_cross_ref = 0;
2871         info->mti_opdata = 0;
2872         info->mti_big_lmm_used = 0;
2873
2874         info->mti_spec.no_create = 0;
2875         info->mti_spec.sp_rm_entry = 0;
2876         info->mti_spec.sp_permitted = 0;
2877
2878         info->mti_spec.u.sp_ea.eadata = NULL;
2879         info->mti_spec.u.sp_ea.eadatalen = 0;
2880 }
2881
2882 void mdt_thread_info_fini(struct mdt_thread_info *info)
2883 {
2884         int i;
2885
2886         if (info->mti_object != NULL) {
2887                 mdt_object_put(info->mti_env, info->mti_object);
2888                 info->mti_object = NULL;
2889         }
2890
2891         for (i = 0; i < ARRAY_SIZE(info->mti_lh); i++)
2892                 mdt_lock_handle_fini(&info->mti_lh[i]);
2893         info->mti_env = NULL;
2894         info->mti_pill = NULL;
2895         info->mti_exp = NULL;
2896
2897         if (unlikely(info->mti_big_buf.lb_buf != NULL))
2898                 lu_buf_free(&info->mti_big_buf);
2899 }
2900
2901 struct mdt_thread_info *tsi2mdt_info(struct tgt_session_info *tsi)
2902 {
2903         struct mdt_thread_info  *mti;
2904         struct lustre_capa      *lc;
2905
2906         mti = mdt_th_info(tsi->tsi_env);
2907         LASSERT(mti != NULL);
2908
2909         mdt_thread_info_init(tgt_ses_req(tsi), mti);
2910         if (tsi->tsi_corpus != NULL) {
2911                 struct req_capsule *pill = tsi->tsi_pill;
2912
2913                 mti->mti_object = mdt_obj(tsi->tsi_corpus);
2914                 lu_object_get(tsi->tsi_corpus);
2915
2916                 /*
2917                  * XXX: must be part of tgt_mdt_body_unpack but moved here
2918                  * due to mdt_set_capainfo().
2919                  */
2920                 if (req_capsule_has_field(pill, &RMF_CAPA1, RCL_CLIENT) &&
2921                     req_capsule_get_size(pill, &RMF_CAPA1, RCL_CLIENT) > 0) {
2922                         lc = req_capsule_client_get(pill, &RMF_CAPA1);
2923                         mdt_set_capainfo(mti, 0, &tsi->tsi_mdt_body->mbo_fid1,
2924                                          lc);
2925                 }
2926         }
2927         mti->mti_body = tsi->tsi_mdt_body;
2928         mti->mti_dlm_req = tsi->tsi_dlm_req;
2929
2930         return mti;
2931 }
2932
2933 static int mdt_tgt_connect(struct tgt_session_info *tsi)
2934 {
2935         struct ptlrpc_request   *req = tgt_ses_req(tsi);
2936         int                      rc;
2937
2938         ENTRY;
2939
2940         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_DELAY_CONDITIONAL) &&
2941             cfs_fail_val ==
2942             tsi2mdt_info(tsi)->mti_mdt->mdt_seq_site.ss_node_id)
2943                 schedule_timeout_and_set_state(TASK_UNINTERRUPTIBLE,
2944                         msecs_to_jiffies(3 * MSEC_PER_SEC));
2945
2946         rc = tgt_connect(tsi);
2947         if (rc != 0)
2948                 RETURN(rc);
2949
2950         rc = mdt_init_idmap(tsi);
2951         if (rc != 0)
2952                 GOTO(err, rc);
2953         RETURN(0);
2954 err:
2955         obd_disconnect(class_export_get(req->rq_export));
2956         return rc;
2957 }
2958
2959 enum mdt_it_code {
2960         MDT_IT_OPEN,
2961         MDT_IT_OCREAT,
2962         MDT_IT_CREATE,
2963         MDT_IT_GETATTR,
2964         MDT_IT_READDIR,
2965         MDT_IT_LOOKUP,
2966         MDT_IT_UNLINK,
2967         MDT_IT_TRUNC,
2968         MDT_IT_GETXATTR,
2969         MDT_IT_LAYOUT,
2970         MDT_IT_QUOTA,
2971         MDT_IT_NR
2972 };
2973
2974 static int mdt_intent_getattr(enum mdt_it_code opcode,
2975                               struct mdt_thread_info *info,
2976                               struct ldlm_lock **,
2977                               __u64);
2978
2979 static int mdt_intent_getxattr(enum mdt_it_code opcode,
2980                                 struct mdt_thread_info *info,
2981                                 struct ldlm_lock **lockp,
2982                                 __u64 flags);
2983
2984 static int mdt_intent_layout(enum mdt_it_code opcode,
2985                              struct mdt_thread_info *info,
2986                              struct ldlm_lock **,
2987                              __u64);
2988 static int mdt_intent_reint(enum mdt_it_code opcode,
2989                             struct mdt_thread_info *info,
2990                             struct ldlm_lock **,
2991                             __u64);
2992
2993 static struct mdt_it_flavor {
2994         const struct req_format *it_fmt;
2995         __u32                    it_flags;
2996         int                    (*it_act)(enum mdt_it_code ,
2997                                          struct mdt_thread_info *,
2998                                          struct ldlm_lock **,
2999                                          __u64);
3000         long                     it_reint;
3001 } mdt_it_flavor[] = {
3002         [MDT_IT_OPEN]     = {
3003                 .it_fmt   = &RQF_LDLM_INTENT,
3004                 /*.it_flags = HABEO_REFERO,*/
3005                 .it_flags = 0,
3006                 .it_act   = mdt_intent_reint,
3007                 .it_reint = REINT_OPEN
3008         },
3009         [MDT_IT_OCREAT]   = {
3010                 .it_fmt   = &RQF_LDLM_INTENT,
3011                 /*
3012                  * OCREAT is not a MUTABOR request as if the file
3013                  * already exists.
3014                  * We do the extra check of OBD_CONNECT_RDONLY in
3015                  * mdt_reint_open() when we really need to create
3016                  * the object.
3017                  */
3018                 .it_flags = 0,
3019                 .it_act   = mdt_intent_reint,
3020                 .it_reint = REINT_OPEN
3021         },
3022         [MDT_IT_CREATE]   = {
3023                 .it_fmt   = &RQF_LDLM_INTENT,
3024                 .it_flags = MUTABOR,
3025                 .it_act   = mdt_intent_reint,
3026                 .it_reint = REINT_CREATE
3027         },
3028         [MDT_IT_GETATTR]  = {
3029                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
3030                 .it_flags = HABEO_REFERO,
3031                 .it_act   = mdt_intent_getattr
3032         },
3033         [MDT_IT_READDIR]  = {
3034                 .it_fmt   = NULL,
3035                 .it_flags = 0,
3036                 .it_act   = NULL
3037         },
3038         [MDT_IT_LOOKUP]   = {
3039                 .it_fmt   = &RQF_LDLM_INTENT_GETATTR,
3040                 .it_flags = HABEO_REFERO,
3041                 .it_act   = mdt_intent_getattr
3042         },
3043         [MDT_IT_UNLINK]   = {
3044                 .it_fmt   = &RQF_LDLM_INTENT_UNLINK,
3045                 .it_flags = MUTABOR,
3046                 .it_act   = NULL,
3047                 .it_reint = REINT_UNLINK
3048         },
3049         [MDT_IT_TRUNC]    = {
3050                 .it_fmt   = NULL,
3051                 .it_flags = MUTABOR,
3052                 .it_act   = NULL
3053         },
3054         [MDT_IT_GETXATTR] = {
3055                 .it_fmt   = &RQF_LDLM_INTENT_GETXATTR,
3056                 .it_flags = HABEO_CORPUS,
3057                 .it_act   = mdt_intent_getxattr
3058         },
3059         [MDT_IT_LAYOUT] = {
3060                 .it_fmt   = &RQF_LDLM_INTENT_LAYOUT,
3061                 .it_flags = 0,
3062                 .it_act   = mdt_intent_layout
3063         }
3064 };
3065
3066 static int
3067 mdt_intent_lock_replace(struct mdt_thread_info *info,
3068                         struct ldlm_lock **lockp,
3069                         struct mdt_lock_handle *lh,
3070                         __u64 flags)
3071 {
3072         struct ptlrpc_request  *req = mdt_info_req(info);
3073         struct ldlm_lock       *lock = *lockp;
3074         struct ldlm_lock       *new_lock;
3075
3076         /* If possible resent found a lock, @lh is set to its handle */
3077         new_lock = ldlm_handle2lock_long(&lh->mlh_reg_lh, 0);
3078
3079         if (new_lock == NULL && (flags & LDLM_FL_INTENT_ONLY)) {
3080                 lh->mlh_reg_lh.cookie = 0;
3081                 RETURN(0);
3082         }
3083
3084         LASSERTF(new_lock != NULL,
3085                  "lockh "LPX64"\n", lh->mlh_reg_lh.cookie);
3086
3087         /*
3088          * If we've already given this lock to a client once, then we should
3089          * have no readers or writers.  Otherwise, we should have one reader
3090          * _or_ writer ref (which will be zeroed below) before returning the
3091          * lock to a client.
3092          */
3093         if (new_lock->l_export == req->rq_export) {
3094                 LASSERT(new_lock->l_readers + new_lock->l_writers == 0);
3095         } else {
3096                 LASSERT(new_lock->l_export == NULL);
3097                 LASSERT(new_lock->l_readers + new_lock->l_writers == 1);
3098         }
3099
3100         *lockp = new_lock;
3101
3102         if (new_lock->l_export == req->rq_export) {
3103                 /*
3104                  * Already gave this to the client, which means that we
3105                  * reconstructed a reply.
3106                  */
3107                 LASSERT(lustre_msg_get_flags(req->rq_reqmsg) &
3108                         MSG_RESENT);
3109
3110                 LDLM_LOCK_RELEASE(new_lock);
3111                 lh->mlh_reg_lh.cookie = 0;
3112                 RETURN(ELDLM_LOCK_REPLACED);
3113         }
3114
3115         /*
3116          * Fixup the lock to be given to the client.
3117          */
3118         lock_res_and_lock(new_lock);
3119         /* Zero new_lock->l_readers and new_lock->l_writers without triggering
3120          * possible blocking AST. */
3121         while (new_lock->l_readers > 0) {
3122                 lu_ref_del(&new_lock->l_reference, "reader", new_lock);
3123                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
3124                 new_lock->l_readers--;
3125         }
3126         while (new_lock->l_writers > 0) {
3127                 lu_ref_del(&new_lock->l_reference, "writer", new_lock);
3128                 lu_ref_del(&new_lock->l_reference, "user", new_lock);
3129                 new_lock->l_writers--;
3130         }
3131
3132         new_lock->l_export = class_export_lock_get(req->rq_export, new_lock);
3133         new_lock->l_blocking_ast = lock->l_blocking_ast;
3134         new_lock->l_completion_ast = lock->l_completion_ast;
3135         new_lock->l_remote_handle = lock->l_remote_handle;
3136         new_lock->l_flags &= ~LDLM_FL_LOCAL;
3137
3138         unlock_res_and_lock(new_lock);
3139
3140         cfs_hash_add(new_lock->l_export->exp_lock_hash,
3141                      &new_lock->l_remote_handle,
3142                      &new_lock->l_exp_hash);
3143
3144         LDLM_LOCK_RELEASE(new_lock);
3145         lh->mlh_reg_lh.cookie = 0;
3146
3147         RETURN(ELDLM_LOCK_REPLACED);
3148 }
3149
3150 static void mdt_intent_fixup_resent(struct mdt_thread_info *info,
3151                                     struct ldlm_lock *new_lock,
3152                                     struct mdt_lock_handle *lh,
3153                                     __u64 flags)
3154 {
3155         struct ptlrpc_request  *req = mdt_info_req(info);
3156         struct ldlm_request    *dlmreq;
3157
3158         if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_RESENT))
3159                 return;
3160
3161         dlmreq = req_capsule_client_get(info->mti_pill, &RMF_DLM_REQ);
3162
3163         /* Check if this is a resend case (MSG_RESENT is set on RPC) and a
3164          * lock was found by ldlm_handle_enqueue(); if so @lh must be
3165          * initialized. */
3166         if (flags & LDLM_FL_RESENT) {
3167                 lh->mlh_reg_lh.cookie = new_lock->l_handle.h_cookie;
3168                 lh->mlh_reg_mode = new_lock->l_granted_mode;
3169
3170                 LDLM_DEBUG(new_lock, "Restoring lock cookie");
3171                 DEBUG_REQ(D_DLMTRACE, req, "restoring lock cookie "LPX64,
3172                           lh->mlh_reg_lh.cookie);
3173                 return;
3174         }
3175
3176         /*
3177          * If the xid matches, then we know this is a resent request, and allow
3178          * it. (It's probably an OPEN, for which we don't send a lock.
3179          */
3180         if (req_xid_is_last(req))
3181                 return;
3182
3183         /*
3184          * This remote handle isn't enqueued, so we never received or processed
3185          * this request.  Clear MSG_RESENT, because it can be handled like any
3186          * normal request now.
3187          */
3188         lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
3189
3190         DEBUG_REQ(D_DLMTRACE, req, "no existing lock with rhandle "LPX64,
3191                   dlmreq->lock_handle[0].cookie);
3192 }
3193
3194 static int mdt_intent_getxattr(enum mdt_it_code opcode,
3195                                 struct mdt_thread_info *info,
3196                                 struct ldlm_lock **lockp,
3197                                 __u64 flags)
3198 {
3199         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3200         struct ldlm_reply      *ldlm_rep = NULL;
3201         int rc, grc;
3202
3203         /*
3204          * Initialize lhc->mlh_reg_lh either from a previously granted lock
3205          * (for the resend case) or a new lock. Below we will use it to
3206          * replace the original lock.
3207          */
3208         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3209         if (!lustre_handle_is_used(&lhc->mlh_reg_lh)) {
3210                 mdt_lock_reg_init(lhc, (*lockp)->l_req_mode);
3211                 rc = mdt_object_lock(info, info->mti_object, lhc,
3212                                         MDS_INODELOCK_XATTR,
3213                                         MDT_LOCAL_LOCK);
3214                 if (rc)
3215                         return rc;
3216         }
3217
3218         grc = mdt_getxattr(info);
3219
3220         rc = mdt_intent_lock_replace(info, lockp, lhc, flags);
3221
3222         if (mdt_info_req(info)->rq_repmsg != NULL)
3223                 ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3224         if (ldlm_rep == NULL)
3225                 RETURN(err_serious(-EFAULT));
3226
3227         ldlm_rep->lock_policy_res2 = grc;
3228
3229         return rc;
3230 }
3231
3232 static int mdt_intent_getattr(enum mdt_it_code opcode,
3233                               struct mdt_thread_info *info,
3234                               struct ldlm_lock **lockp,
3235                               __u64 flags)
3236 {
3237         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3238         __u64                   child_bits;
3239         struct ldlm_reply      *ldlm_rep;
3240         struct mdt_body        *reqbody;
3241         struct mdt_body        *repbody;
3242         int                     rc, rc2;
3243         ENTRY;
3244
3245         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
3246         LASSERT(reqbody);
3247
3248         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
3249         LASSERT(repbody);
3250
3251         info->mti_cross_ref = !!(reqbody->mbo_valid & OBD_MD_FLCROSSREF);
3252         repbody->mbo_eadatasize = 0;
3253         repbody->mbo_aclsize = 0;
3254
3255         switch (opcode) {
3256         case MDT_IT_LOOKUP:
3257                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_PERM;
3258                 break;
3259         case MDT_IT_GETATTR:
3260                 child_bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE |
3261                              MDS_INODELOCK_PERM;
3262                 break;
3263         default:
3264                 CERROR("Unsupported intent (%d)\n", opcode);
3265                 GOTO(out_shrink, rc = -EINVAL);
3266         }
3267
3268         rc = mdt_init_ucred(info, reqbody);
3269         if (rc)
3270                 GOTO(out_shrink, rc);
3271
3272         ldlm_rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3273         mdt_set_disposition(info, ldlm_rep, DISP_IT_EXECD);
3274
3275         /* Get lock from request for possible resent case. */
3276         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3277
3278         rc = mdt_getattr_name_lock(info, lhc, child_bits, ldlm_rep);
3279         ldlm_rep->lock_policy_res2 = clear_serious(rc);
3280
3281         if (mdt_get_disposition(ldlm_rep, DISP_LOOKUP_NEG))
3282                 ldlm_rep->lock_policy_res2 = 0;
3283         if (!mdt_get_disposition(ldlm_rep, DISP_LOOKUP_POS) ||
3284             ldlm_rep->lock_policy_res2) {
3285                 lhc->mlh_reg_lh.cookie = 0ull;
3286                 GOTO(out_ucred, rc = ELDLM_LOCK_ABORTED);
3287         }
3288
3289         rc = mdt_intent_lock_replace(info, lockp, lhc, flags);
3290         EXIT;
3291 out_ucred:
3292         mdt_exit_ucred(info);
3293 out_shrink:
3294         mdt_client_compatibility(info);
3295         rc2 = mdt_fix_reply(info);
3296         if (rc == 0)
3297                 rc = rc2;
3298         return rc;
3299 }
3300
3301 static int mdt_intent_layout(enum mdt_it_code opcode,
3302                              struct mdt_thread_info *info,
3303                              struct ldlm_lock **lockp,
3304                              __u64 flags)
3305 {
3306         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_LAYOUT];
3307         struct layout_intent *layout;
3308         struct lu_fid *fid;
3309         struct mdt_object *obj = NULL;
3310         int rc = 0;
3311         ENTRY;
3312
3313         if (opcode != MDT_IT_LAYOUT) {
3314                 CERROR("%s: Unknown intent (%d)\n", mdt_obd_name(info->mti_mdt),
3315                         opcode);
3316                 RETURN(-EINVAL);
3317         }
3318
3319         fid = &info->mti_tmp_fid2;
3320         fid_extract_from_res_name(fid, &(*lockp)->l_resource->lr_name);
3321
3322         /* Get lock from request for possible resent case. */
3323         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3324
3325         obj = mdt_object_find(info->mti_env, info->mti_mdt, fid);
3326         if (IS_ERR(obj))
3327                 RETURN(PTR_ERR(obj));
3328
3329         if (mdt_object_exists(obj) && !mdt_object_remote(obj)) {
3330                 /* get the length of lsm */
3331                 rc = mdt_attr_get_eabuf_size(info, obj);
3332                 if (rc < 0) {
3333                         mdt_object_put(info->mti_env, obj);
3334                         RETURN(rc);
3335                 }
3336
3337                 if (rc > info->mti_mdt->mdt_max_mdsize)
3338                         info->mti_mdt->mdt_max_mdsize = rc;
3339         }
3340
3341         mdt_object_put(info->mti_env, obj);
3342
3343         (*lockp)->l_lvb_type = LVB_T_LAYOUT;
3344         req_capsule_set_size(info->mti_pill, &RMF_DLM_LVB, RCL_SERVER, rc);
3345         rc = req_capsule_server_pack(info->mti_pill);
3346         if (rc != 0)
3347                 RETURN(-EINVAL);
3348
3349         if (lustre_handle_is_used(&lhc->mlh_reg_lh))
3350                 rc = mdt_intent_lock_replace(info, lockp, lhc, flags);
3351
3352         layout = req_capsule_client_get(info->mti_pill, &RMF_LAYOUT_INTENT);
3353         LASSERT(layout != NULL);
3354         if (layout->li_opc == LAYOUT_INTENT_ACCESS)
3355                 /* return to normal/resent ldlm handling */
3356                 RETURN(rc);
3357
3358         CERROR("%s: Unsupported layout intent (%d)\n",
3359                 mdt_obd_name(info->mti_mdt), layout->li_opc);
3360         RETURN(-EINVAL);
3361 }
3362
3363 static int mdt_intent_reint(enum mdt_it_code opcode,
3364                             struct mdt_thread_info *info,
3365                             struct ldlm_lock **lockp,
3366                             __u64 flags)
3367 {
3368         struct mdt_lock_handle *lhc = &info->mti_lh[MDT_LH_RMT];
3369         struct ldlm_reply      *rep = NULL;
3370         long                    opc;
3371         int                     rc;
3372
3373         static const struct req_format *intent_fmts[REINT_MAX] = {
3374                 [REINT_CREATE]  = &RQF_LDLM_INTENT_CREATE,
3375                 [REINT_OPEN]    = &RQF_LDLM_INTENT_OPEN
3376         };
3377
3378         ENTRY;
3379
3380         opc = mdt_reint_opcode(mdt_info_req(info), intent_fmts);
3381         if (opc < 0)
3382                 RETURN(opc);
3383
3384         if (mdt_it_flavor[opcode].it_reint != opc) {
3385                 CERROR("Reint code %ld doesn't match intent: %d\n",
3386                        opc, opcode);
3387                 RETURN(err_serious(-EPROTO));
3388         }
3389
3390         /* Get lock from request for possible resent case. */
3391         mdt_intent_fixup_resent(info, *lockp, lhc, flags);
3392
3393         rc = mdt_reint_internal(info, lhc, opc);
3394
3395         /* Check whether the reply has been packed successfully. */
3396         if (mdt_info_req(info)->rq_repmsg != NULL)
3397                 rep = req_capsule_server_get(info->mti_pill, &RMF_DLM_REP);
3398         if (rep == NULL)
3399                 RETURN(err_serious(-EFAULT));
3400
3401         /* MDC expects this in any case */
3402         if (rc != 0)
3403                 mdt_set_disposition(info, rep, DISP_LOOKUP_EXECD);
3404
3405         /* the open lock or the lock for cross-ref object should be
3406          * returned to the client */
3407         if (lustre_handle_is_used(&lhc->mlh_reg_lh) &&
3408             (rc == 0 || rc == -MDT_EREMOTE_OPEN)) {
3409                 rep->lock_policy_res2 = 0;
3410                 rc = mdt_intent_lock_replace(info, lockp, lhc, flags);
3411                 RETURN(rc);
3412         }
3413
3414         rep->lock_policy_res2 = clear_serious(rc);
3415
3416         if (rep->lock_policy_res2 == -ENOENT &&
3417             mdt_get_disposition(rep, DISP_LOOKUP_NEG))
3418                 rep->lock_policy_res2 = 0;
3419
3420         lhc->mlh_reg_lh.cookie = 0ull;
3421         if (rc == -ENOTCONN || rc == -ENODEV ||
3422             rc == -EOVERFLOW) { /**< if VBR failure then return error */
3423                 /*
3424                  * If it is the disconnect error (ENODEV & ENOCONN), the error
3425                  * will be returned by rq_status, and client at ptlrpc layer
3426                  * will detect this, then disconnect, reconnect the import
3427                  * immediately, instead of impacting the following the rpc.
3428                  */
3429                 RETURN(rc);
3430         }
3431         /*
3432          * For other cases, the error will be returned by intent, and client
3433          * will retrieve the result from intent.
3434          */
3435         RETURN(ELDLM_LOCK_ABORTED);
3436 }
3437
3438 static int mdt_intent_code(long itcode)
3439 {
3440         int rc;
3441
3442         switch(itcode) {
3443         case IT_OPEN:
3444                 rc = MDT_IT_OPEN;
3445                 break;
3446         case IT_OPEN|IT_CREAT:
3447                 rc = MDT_IT_OCREAT;
3448                 break;
3449         case IT_CREAT:
3450                 rc = MDT_IT_CREATE;
3451                 break;
3452         case IT_READDIR:
3453                 rc = MDT_IT_READDIR;
3454                 break;
3455         case IT_GETATTR:
3456                 rc = MDT_IT_GETATTR;
3457                 break;
3458         case IT_LOOKUP:
3459                 rc = MDT_IT_LOOKUP;
3460                 break;
3461         case IT_UNLINK:
3462                 rc = MDT_IT_UNLINK;
3463                 break;
3464         case IT_TRUNC:
3465                 rc = MDT_IT_TRUNC;
3466                 break;
3467         case IT_GETXATTR:
3468                 rc = MDT_IT_GETXATTR;
3469                 break;
3470         case IT_LAYOUT:
3471                 rc = MDT_IT_LAYOUT;
3472                 break;
3473         case IT_QUOTA_DQACQ:
3474         case IT_QUOTA_CONN:
3475                 rc = MDT_IT_QUOTA;
3476                 break;
3477         default:
3478                 CERROR("Unknown intent opcode: %ld\n", itcode);
3479                 rc = -EINVAL;
3480                 break;
3481         }
3482         return rc;
3483 }
3484
3485 static int mdt_intent_opc(long itopc, struct mdt_thread_info *info,
3486                           struct ldlm_lock **lockp, __u64 flags)
3487 {
3488         struct req_capsule      *pill = info->mti_pill;
3489         struct ptlrpc_request   *req = mdt_info_req(info);
3490         struct mdt_it_flavor    *flv;
3491         int opc;
3492         int rc;
3493         ENTRY;
3494
3495         opc = mdt_intent_code(itopc);
3496         if (opc < 0)
3497                 RETURN(-EINVAL);
3498
3499         if (opc == MDT_IT_QUOTA) {
3500                 struct lu_device *qmt = info->mti_mdt->mdt_qmt_dev;
3501
3502                 if (qmt == NULL)
3503                         RETURN(-EOPNOTSUPP);
3504
3505                 (*lockp)->l_lvb_type = LVB_T_LQUOTA;
3506                 /* pass the request to quota master */
3507                 rc = qmt_hdls.qmth_intent_policy(info->mti_env, qmt,
3508                                                  mdt_info_req(info), lockp,
3509                                                  flags);
3510                 RETURN(rc);
3511         }
3512
3513         flv = &mdt_it_flavor[opc];
3514         if (flv->it_fmt != NULL)
3515                 req_capsule_extend(pill, flv->it_fmt);
3516
3517         rc = mdt_unpack_req_pack_rep(info, flv->it_flags);
3518         if (rc < 0)
3519                 RETURN(rc);
3520
3521         if (flv->it_flags & MUTABOR &&
3522             exp_connect_flags(req->rq_export) & OBD_CONNECT_RDONLY)
3523                 RETURN(-EROFS);
3524
3525         if (flv->it_act != NULL) {
3526                 struct ldlm_reply *rep;
3527
3528                 /* execute policy */
3529                 rc = flv->it_act(opc, info, lockp, flags);
3530
3531                 /* Check whether the reply has been packed successfully. */
3532                 if (req->rq_repmsg != NULL) {
3533                         rep = req_capsule_server_get(info->mti_pill,
3534                                                      &RMF_DLM_REP);
3535                         rep->lock_policy_res2 =
3536                                 ptlrpc_status_hton(rep->lock_policy_res2);
3537                 }
3538         }
3539
3540         RETURN(rc);
3541 }
3542
3543 static int mdt_intent_policy(struct ldlm_namespace *ns,
3544                              struct ldlm_lock **lockp, void *req_cookie,
3545                              ldlm_mode_t mode, __u64 flags, void *data)
3546 {
3547         struct tgt_session_info *tsi;
3548         struct mdt_thread_info  *info;
3549         struct ptlrpc_request   *req  =  req_cookie;
3550         struct ldlm_intent      *it;
3551         struct req_capsule      *pill;
3552         int rc;
3553
3554         ENTRY;
3555
3556         LASSERT(req != NULL);
3557
3558         tsi = tgt_ses_info(req->rq_svc_thread->t_env);
3559
3560         info = tsi2mdt_info(tsi);
3561         LASSERT(info != NULL);
3562         pill = info->mti_pill;
3563         LASSERT(pill->rc_req == req);
3564
3565         if (req->rq_reqmsg->lm_bufcount > DLM_INTENT_IT_OFF) {
3566                 req_capsule_extend(pill, &RQF_LDLM_INTENT_BASIC);
3567                 it = req_capsule_client_get(pill, &RMF_LDLM_INTENT);
3568                 if (it != NULL) {
3569                         rc = mdt_intent_opc(it->opc, info, lockp, flags);
3570                         if (rc == 0)
3571                                 rc = ELDLM_OK;
3572
3573                         /* Lock without inodebits makes no sense and will oops
3574                          * later in ldlm. Let's check it now to see if we have
3575                          * ibits corrupted somewhere in mdt_intent_opc().
3576                          * The case for client miss to set ibits has been
3577                          * processed by others. */
3578                         LASSERT(ergo(info->mti_dlm_req->lock_desc.l_resource.\
3579                                         lr_type == LDLM_IBITS,
3580                                      info->mti_dlm_req->lock_desc.\
3581                                         l_policy_data.l_inodebits.bits != 0));
3582                 } else
3583                         rc = err_serious(-EFAULT);
3584         } else {
3585                 /* No intent was provided */
3586                 LASSERT(pill->rc_fmt == &RQF_LDLM_ENQUEUE);
3587                 req_capsule_set_size(pill, &RMF_DLM_LVB, RCL_SERVER, 0);
3588                 rc = req_capsule_server_pack(pill);
3589                 if (rc)
3590                         rc = err_serious(rc);
3591         }
3592         mdt_thread_info_fini(info);
3593         RETURN(rc);
3594 }
3595
3596 static void mdt_deregister_seq_exp(struct mdt_device *mdt)
3597 {
3598         struct seq_server_site  *ss = mdt_seq_site(mdt);
3599
3600         if (ss->ss_node_id == 0)
3601                 return;
3602
3603         if (ss->ss_client_seq != NULL) {
3604                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
3605                 ss->ss_client_seq->lcs_exp = NULL;
3606         }
3607
3608         if (ss->ss_server_fld != NULL) {
3609                 lustre_deregister_lwp_item(&ss->ss_server_fld->lsf_control_exp);
3610                 ss->ss_server_fld->lsf_control_exp = NULL;
3611         }
3612 }
3613
3614 static void mdt_seq_fini_cli(struct mdt_device *mdt)
3615 {
3616         struct seq_server_site *ss = mdt_seq_site(mdt);
3617
3618         if (ss == NULL)
3619                 return;
3620
3621         if (ss->ss_server_seq != NULL)
3622                 seq_server_set_cli(NULL, ss->ss_server_seq, NULL);
3623 }
3624
3625 static int mdt_seq_fini(const struct lu_env *env, struct mdt_device *mdt)
3626 {
3627         mdt_seq_fini_cli(mdt);
3628         mdt_deregister_seq_exp(mdt);
3629
3630         return seq_site_fini(env, mdt_seq_site(mdt));
3631 }
3632
3633 /**
3634  * It will retrieve its FLDB entries from MDT0, and it only happens
3635  * when upgrading existent FS to 2.6 or when local FLDB is corrupted,
3636  * and it needs to refresh FLDB from the MDT0.
3637  **/
3638 static int mdt_register_lwp_callback(void *data)
3639 {
3640         struct lu_env           env;
3641         struct mdt_device       *mdt = data;
3642         struct lu_server_fld    *fld = mdt_seq_site(mdt)->ss_server_fld;
3643         int                     rc;
3644         ENTRY;
3645
3646         LASSERT(mdt_seq_site(mdt)->ss_node_id != 0);
3647
3648         if (!likely(fld->lsf_new))
3649                 RETURN(0);
3650
3651         rc = lu_env_init(&env, LCT_MD_THREAD);
3652         if (rc) {
3653                 CERROR("%s: cannot init env: rc = %d\n", mdt_obd_name(mdt), rc);
3654                 RETURN(rc);
3655         }
3656
3657         rc = fld_update_from_controller(&env, fld);
3658         if (rc != 0) {
3659                 CERROR("%s: cannot update controller: rc = %d\n",
3660                        mdt_obd_name(mdt), rc);
3661                 GOTO(out, rc);
3662         }
3663 out:
3664         lu_env_fini(&env);
3665         RETURN(rc);
3666 }
3667
3668 static int mdt_register_seq_exp(struct mdt_device *mdt)
3669 {
3670         struct seq_server_site  *ss = mdt_seq_site(mdt);
3671         char                    *lwp_name = NULL;
3672         int                     rc;
3673
3674         if (ss->ss_node_id == 0)
3675                 return 0;
3676
3677         OBD_ALLOC(lwp_name, MAX_OBD_NAME);
3678         if (lwp_name == NULL)
3679                 GOTO(out_free, rc = -ENOMEM);
3680
3681         rc = tgt_name2lwp_name(mdt_obd_name(mdt), lwp_name, MAX_OBD_NAME, 0);
3682         if (rc != 0)
3683                 GOTO(out_free, rc);
3684
3685         rc = lustre_register_lwp_item(lwp_name, &ss->ss_client_seq->lcs_exp,
3686                                       NULL, NULL);
3687         if (rc != 0)
3688                 GOTO(out_free, rc);
3689
3690         rc = lustre_register_lwp_item(lwp_name,
3691                                       &ss->ss_server_fld->lsf_control_exp,
3692                                       mdt_register_lwp_callback, mdt);
3693         if (rc != 0) {
3694                 lustre_deregister_lwp_item(&ss->ss_client_seq->lcs_exp);
3695                 ss->ss_client_seq->lcs_exp = NULL;
3696                 GOTO(out_free, rc);
3697         }
3698 out_free:
3699         if (lwp_name != NULL)
3700                 OBD_FREE(lwp_name, MAX_OBD_NAME);
3701