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[fs/lustre-release.git] / lustre / mdc / mdc_request.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 only,
8  * as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * General Public License version 2 for more details (a copy is included
14  * in the LICENSE file that accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License
17  * version 2 along with this program; If not, see
18  * http://www.gnu.org/licenses/gpl-2.0.html
19  *
20  * GPL HEADER END
21  */
22 /*
23  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
24  * Use is subject to license terms.
25  *
26  * Copyright (c) 2011, 2017, Intel Corporation.
27  */
28 /*
29  * This file is part of Lustre, http://www.lustre.org/
30  */
31
32 #define DEBUG_SUBSYSTEM S_MDC
33
34 #include <linux/init.h>
35 #include <linux/kthread.h>
36 #include <linux/module.h>
37 #include <linux/pagemap.h>
38 #include <linux/user_namespace.h>
39 #include <linux/utsname.h>
40 #include <linux/delay.h>
41 #include <linux/uidgid.h>
42 #include <linux/device.h>
43 #include <linux/xarray.h>
44
45 #include <lustre_errno.h>
46
47 #include <cl_object.h>
48 #include <llog_swab.h>
49 #include <lprocfs_status.h>
50 #include <lustre_acl.h>
51 #include <lustre_compat.h>
52 #include <lustre_fid.h>
53 #include <uapi/linux/lustre/lustre_ioctl.h>
54 #include <lustre_kernelcomm.h>
55 #include <lustre_lmv.h>
56 #include <lustre_log.h>
57 #include <lustre_swab.h>
58 #include <obd_class.h>
59 #include <lustre_osc.h>
60
61 #include "mdc_internal.h"
62
63 #define REQUEST_MINOR 244
64
65 static int mdc_cleanup(struct obd_device *obd);
66
67 static inline int mdc_queue_wait(struct ptlrpc_request *req)
68 {
69         struct client_obd *cli = &req->rq_import->imp_obd->u.cli;
70         int rc;
71
72         /* obd_get_request_slot() ensures that this client has no more
73          * than cl_max_rpcs_in_flight RPCs simultaneously inf light
74          * against an MDT. */
75         rc = obd_get_request_slot(cli);
76         if (rc != 0)
77                 return rc;
78
79         rc = ptlrpc_queue_wait(req);
80         obd_put_request_slot(cli);
81
82         return rc;
83 }
84
85 /*
86  * Send MDS_GET_ROOT RPC to fetch root FID.
87  *
88  * If \a fileset is not NULL it should contain a subdirectory off
89  * the ROOT/ directory to be mounted on the client. Return the FID
90  * of the subdirectory to the client to mount onto its mountpoint.
91  *
92  * \param[in]   imp     MDC import
93  * \param[in]   fileset fileset name, which could be NULL
94  * \param[out]  rootfid root FID of this mountpoint
95  * \param[out]  pc      root capa will be unpacked and saved in this pointer
96  *
97  * \retval      0 on success, negative errno on failure
98  */
99 static int mdc_get_root(struct obd_export *exp, const char *fileset,
100                          struct lu_fid *rootfid)
101 {
102         struct ptlrpc_request   *req;
103         struct mdt_body         *body;
104         int                      rc;
105
106         ENTRY;
107
108         if (fileset && !(exp_connect_flags(exp) & OBD_CONNECT_SUBTREE))
109                 RETURN(-ENOTSUPP);
110
111         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
112                                 &RQF_MDS_GET_ROOT);
113         if (req == NULL)
114                 RETURN(-ENOMEM);
115
116         if (fileset != NULL)
117                 req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
118                                      strlen(fileset) + 1);
119         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GET_ROOT);
120         if (rc) {
121                 ptlrpc_request_free(req);
122                 RETURN(rc);
123         }
124         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
125         if (fileset != NULL) {
126                 char *name = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
127
128                 memcpy(name, fileset, strlen(fileset));
129         }
130         lustre_msg_add_flags(req->rq_reqmsg, LUSTRE_IMP_FULL);
131         req->rq_send_state = LUSTRE_IMP_FULL;
132
133         ptlrpc_request_set_replen(req);
134
135         rc = ptlrpc_queue_wait(req);
136         if (rc)
137                 GOTO(out, rc);
138
139         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
140         if (body == NULL)
141                 GOTO(out, rc = -EPROTO);
142
143         *rootfid = body->mbo_fid1;
144         CDEBUG(D_NET, "root fid="DFID", last_committed=%llu\n",
145                PFID(rootfid), lustre_msg_get_last_committed(req->rq_repmsg));
146         EXIT;
147 out:
148         ptlrpc_req_finished(req);
149
150         return rc;
151 }
152
153 /*
154  * This function now is known to always saying that it will receive 4 buffers
155  * from server. Even for cases when acl_size and md_size is zero, RPC header
156  * will contain 4 fields and RPC itself will contain zero size fields. This is
157  * because mdt_getattr*() _always_ returns 4 fields, but if acl is not needed
158  * and thus zero, it shrinks it, making zero size. The same story about
159  * md_size. And this is course of problem when client waits for smaller number
160  * of fields. This issue will be fixed later when client gets aware of RPC
161  * layouts.  --umka
162  */
163 static int mdc_getattr_common(struct obd_export *exp,
164                               struct ptlrpc_request *req,
165                               struct md_op_data *op_data)
166 {
167         struct req_capsule *pill = &req->rq_pill;
168         struct mdt_body    *body;
169         void               *eadata;
170         int                 rc;
171         ENTRY;
172
173         /* Request message already built. */
174         rc = ptlrpc_queue_wait(req);
175         if (rc != 0)
176                 RETURN(rc);
177
178         /* sanity check for the reply */
179         body = req_capsule_server_get(pill, &RMF_MDT_BODY);
180         if (body == NULL)
181                 RETURN(-EPROTO);
182
183         CDEBUG(D_NET, "mode: %o\n", body->mbo_mode);
184
185         mdc_update_max_ea_from_body(exp, body);
186         if (body->mbo_eadatasize != 0) {
187                 eadata = req_capsule_server_sized_get(pill, &RMF_MDT_MD,
188                                                       body->mbo_eadatasize);
189                 if (eadata == NULL)
190                         RETURN(-EPROTO);
191         }
192
193         /* If encryption context was returned by MDT, put it in op_data
194          * so that caller can set it on inode and save an extra getxattr.
195          */
196         if (op_data && op_data->op_valid & OBD_MD_ENCCTX &&
197             body->mbo_valid & OBD_MD_ENCCTX) {
198                 op_data->op_file_encctx =
199                         req_capsule_server_get(pill, &RMF_FILE_ENCCTX);
200                 op_data->op_file_encctx_size =
201                         req_capsule_get_size(pill, &RMF_FILE_ENCCTX,
202                                              RCL_SERVER);
203         }
204
205         RETURN(0);
206 }
207
208 static void mdc_reset_acl_req(struct ptlrpc_request *req)
209 {
210         spin_lock(&req->rq_early_free_lock);
211         sptlrpc_cli_free_repbuf(req);
212         req->rq_repbuf = NULL;
213         req->rq_repbuf_len = 0;
214         req->rq_repdata = NULL;
215         req->rq_reqdata_len = 0;
216         spin_unlock(&req->rq_early_free_lock);
217 }
218
219 static int mdc_getattr(struct obd_export *exp, struct md_op_data *op_data,
220                        struct ptlrpc_request **request)
221 {
222         struct ptlrpc_request *req;
223         struct obd_device *obd = class_exp2obd(exp);
224         struct obd_import *imp = class_exp2cliimp(exp);
225         __u32 acl_bufsize = LUSTRE_POSIX_ACL_MAX_SIZE_OLD;
226         int rc;
227         ENTRY;
228
229         /* Single MDS without an LMV case */
230         if (op_data->op_flags & MF_GET_MDT_IDX) {
231                 op_data->op_mds = 0;
232                 RETURN(0);
233         }
234
235         *request = NULL;
236         req = ptlrpc_request_alloc(imp, &RQF_MDS_GETATTR);
237         if (req == NULL)
238                 RETURN(-ENOMEM);
239
240         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GETATTR);
241         if (rc) {
242                 ptlrpc_request_free(req);
243                 RETURN(rc);
244         }
245
246         /* LU-15245: avoid deadlock with modifying RPCs on MDS_REQUEST_PORTAL */
247         req->rq_request_portal = MDS_READPAGE_PORTAL;
248
249 again:
250         mdc_pack_body(&req->rq_pill, &op_data->op_fid1, op_data->op_valid,
251                       op_data->op_mode, -1, 0);
252         req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER, acl_bufsize);
253         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
254                              op_data->op_mode);
255         if (exp_connect_encrypt(exp) && op_data->op_valid & OBD_MD_ENCCTX)
256                 req_capsule_set_size(&req->rq_pill, &RMF_FILE_ENCCTX,
257                                      RCL_SERVER,
258                                      obd->u.cli.cl_max_mds_easize);
259         else
260                 req_capsule_set_size(&req->rq_pill, &RMF_FILE_ENCCTX,
261                                      RCL_SERVER, 0);
262         ptlrpc_request_set_replen(req);
263
264         rc = mdc_getattr_common(exp, req, op_data);
265         if (rc) {
266                 if (rc == -ERANGE) {
267                         acl_bufsize = min_t(__u32,
268                                             imp->imp_connect_data.ocd_max_easize,
269                                             XATTR_SIZE_MAX);
270                         mdc_reset_acl_req(req);
271                         goto again;
272                 }
273
274                 ptlrpc_req_finished(req);
275         } else {
276                 *request = req;
277         }
278
279         RETURN(rc);
280 }
281
282 static int mdc_getattr_name(struct obd_export *exp, struct md_op_data *op_data,
283                             struct ptlrpc_request **request)
284 {
285         struct ptlrpc_request *req;
286         struct obd_import *imp = class_exp2cliimp(exp);
287         __u32 acl_bufsize = LUSTRE_POSIX_ACL_MAX_SIZE_OLD;
288         int rc;
289         ENTRY;
290
291         *request = NULL;
292         req = ptlrpc_request_alloc(imp, &RQF_MDS_GETATTR_NAME);
293         if (req == NULL)
294                 RETURN(-ENOMEM);
295
296         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
297                              op_data->op_namelen + 1);
298
299         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GETATTR_NAME);
300         if (rc) {
301                 ptlrpc_request_free(req);
302                 RETURN(rc);
303         }
304
305         if (op_data->op_name) {
306                 char *name = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
307                 LASSERT(strnlen(op_data->op_name, op_data->op_namelen) ==
308                                 op_data->op_namelen);
309                 memcpy(name, op_data->op_name, op_data->op_namelen);
310         }
311
312 again:
313         mdc_pack_body(&req->rq_pill, &op_data->op_fid1, op_data->op_valid,
314                       op_data->op_mode, op_data->op_suppgids[0], 0);
315         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
316                              op_data->op_mode);
317         req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER, acl_bufsize);
318         req_capsule_set_size(&req->rq_pill, &RMF_FILE_ENCCTX, RCL_SERVER, 0);
319         ptlrpc_request_set_replen(req);
320         if (op_data->op_bias & MDS_FID_OP) {
321                 struct mdt_body *b = req_capsule_client_get(&req->rq_pill,
322                                                             &RMF_MDT_BODY);
323
324                 if (b) {
325                         b->mbo_valid |= OBD_MD_NAMEHASH;
326                         b->mbo_fid2 = op_data->op_fid2;
327                 }
328         }
329
330         rc = mdc_getattr_common(exp, req, NULL);
331         if (rc) {
332                 if (rc == -ERANGE) {
333                         acl_bufsize = min_t(__u32,
334                                             imp->imp_connect_data.ocd_max_easize,
335                                             XATTR_SIZE_MAX);
336                         mdc_reset_acl_req(req);
337                         goto again;
338                 }
339
340                 ptlrpc_req_finished(req);
341         } else {
342                 *request = req;
343         }
344
345         RETURN(rc);
346 }
347
348 static int mdc_xattr_common(struct obd_export *exp,const struct req_format *fmt,
349                             const struct lu_fid *fid, int opcode, u64 valid,
350                             const char *xattr_name, const char *input,
351                             int input_size, int output_size, int flags,
352                             __u32 suppgid, struct ptlrpc_request **request)
353 {
354         struct ptlrpc_request *req;
355         int   xattr_namelen = 0;
356         char *tmp;
357         int   rc;
358         ENTRY;
359
360         *request = NULL;
361         req = ptlrpc_request_alloc(class_exp2cliimp(exp), fmt);
362         if (req == NULL)
363                 RETURN(-ENOMEM);
364
365         if (xattr_name) {
366                 xattr_namelen = strlen(xattr_name) + 1;
367                 req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
368                                      xattr_namelen);
369         }
370         if (input_size)
371                 LASSERT(input);
372         req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT,
373                              input_size);
374
375         /* get SELinux policy info if any */
376         rc = sptlrpc_get_sepol(req);
377         if (rc < 0) {
378                 ptlrpc_request_free(req);
379                 RETURN(rc);
380         }
381         req_capsule_set_size(&req->rq_pill, &RMF_SELINUX_POL, RCL_CLIENT,
382                              strlen(req->rq_sepol) ?
383                              strlen(req->rq_sepol) + 1 : 0);
384
385         /* Flush local XATTR locks to get rid of a possible cancel RPC */
386         if (opcode == MDS_REINT && fid_is_sane(fid) &&
387             exp->exp_connect_data.ocd_ibits_known & MDS_INODELOCK_XATTR) {
388                 LIST_HEAD(cancels);
389                 int count;
390
391                 /* Without that packing would fail */
392                 if (input_size == 0)
393                         req_capsule_set_size(&req->rq_pill, &RMF_EADATA,
394                                              RCL_CLIENT, 0);
395
396                 count = mdc_resource_get_unused(exp, fid,
397                                                 &cancels, LCK_EX,
398                                                 MDS_INODELOCK_XATTR);
399
400                 rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
401                 if (rc) {
402                         ptlrpc_request_free(req);
403                         RETURN(rc);
404                 }
405         } else {
406                 rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, opcode);
407                 if (rc) {
408                         ptlrpc_request_free(req);
409                         RETURN(rc);
410                 }
411         }
412
413         if (opcode == MDS_REINT) {
414                 struct mdt_rec_setxattr *rec;
415
416                 BUILD_BUG_ON(sizeof(struct mdt_rec_setxattr) !=
417                              sizeof(struct mdt_rec_reint));
418                 rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
419                 rec->sx_opcode = REINT_SETXATTR;
420                 rec->sx_fsuid  = from_kuid(&init_user_ns, current_fsuid());
421                 rec->sx_fsgid  = from_kgid(&init_user_ns, current_fsgid());
422                 rec->sx_cap = current_cap().cap[0];
423                 rec->sx_suppgid1 = suppgid;
424                 rec->sx_suppgid2 = -1;
425                 rec->sx_fid    = *fid;
426                 rec->sx_valid  = valid | OBD_MD_FLCTIME;
427                 rec->sx_time   = ktime_get_real_seconds();
428                 rec->sx_size   = output_size;
429                 rec->sx_flags  = flags;
430         } else {
431                 mdc_pack_body(&req->rq_pill, fid, valid, output_size,
432                               suppgid, flags);
433                 /* Avoid deadlock with modifying RPCs on MDS_REQUEST_PORTAL.
434                  * See LU-15245.
435                  */
436                 req->rq_request_portal = MDS_READPAGE_PORTAL;
437         }
438
439         if (xattr_name) {
440                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
441                 memcpy(tmp, xattr_name, xattr_namelen);
442         }
443         if (input_size) {
444                 tmp = req_capsule_client_get(&req->rq_pill, &RMF_EADATA);
445                 memcpy(tmp, input, input_size);
446         }
447
448         mdc_file_sepol_pack(&req->rq_pill);
449
450         if (req_capsule_has_field(&req->rq_pill, &RMF_EADATA, RCL_SERVER))
451                 req_capsule_set_size(&req->rq_pill, &RMF_EADATA,
452                                      RCL_SERVER, output_size);
453         ptlrpc_request_set_replen(req);
454
455         /* make rpc */
456         if (opcode == MDS_REINT)
457                 ptlrpc_get_mod_rpc_slot(req);
458
459         rc = ptlrpc_queue_wait(req);
460
461         if (opcode == MDS_REINT)
462                 ptlrpc_put_mod_rpc_slot(req);
463
464         if (rc)
465                 ptlrpc_req_finished(req);
466         else
467                 *request = req;
468         RETURN(rc);
469 }
470
471 static int mdc_setxattr(struct obd_export *exp, const struct lu_fid *fid,
472                         u64 obd_md_valid, const char *name,
473                         const void *value, size_t value_size,
474                         unsigned int xattr_flags, u32 suppgid,
475                         struct ptlrpc_request **req)
476 {
477         LASSERT(obd_md_valid == OBD_MD_FLXATTR ||
478                 obd_md_valid == OBD_MD_FLXATTRRM);
479
480         return mdc_xattr_common(exp, &RQF_MDS_REINT_SETXATTR,
481                                 fid, MDS_REINT, obd_md_valid, name,
482                                 value, value_size, 0, xattr_flags, suppgid,
483                                 req);
484 }
485
486 static int mdc_getxattr(struct obd_export *exp, const struct lu_fid *fid,
487                         u64 obd_md_valid, const char *name, size_t buf_size,
488                         struct ptlrpc_request **req)
489 {
490         struct mdt_body *body;
491         int rc;
492
493         LASSERT(obd_md_valid == OBD_MD_FLXATTR ||
494                 obd_md_valid == OBD_MD_FLXATTRLS);
495
496         /* Message below is checked in sanity-selinux test_20d
497          * and sanity-sec test_49
498          */
499         CDEBUG(D_INFO, "%s: get xattr '%s' for "DFID"\n",
500                exp->exp_obd->obd_name, name, PFID(fid));
501         rc = mdc_xattr_common(exp, &RQF_MDS_GETXATTR, fid, MDS_GETXATTR,
502                               obd_md_valid, name, NULL, 0, buf_size, 0, -1,
503                               req);
504         if (rc < 0)
505                 GOTO(out, rc);
506
507         body = req_capsule_server_get(&(*req)->rq_pill, &RMF_MDT_BODY);
508         if (body == NULL)
509                 GOTO(out, rc = -EPROTO);
510
511         /* only detect the xattr size */
512         if (buf_size == 0) {
513                 /* LU-11109: Older MDTs do not distinguish
514                  * between nonexistent xattrs and zero length
515                  * values in this case. Newer MDTs will return
516                  * -ENODATA or set OBD_MD_FLXATTR. */
517                 GOTO(out, rc = body->mbo_eadatasize);
518         }
519
520         if (body->mbo_eadatasize == 0) {
521                 /* LU-11109: Newer MDTs set OBD_MD_FLXATTR on
522                  * success so that we can distinguish between
523                  * zero length value and nonexistent xattr.
524                  *
525                  * If OBD_MD_FLXATTR is not set then we keep
526                  * the old behavior and return -ENODATA for
527                  * getxattr() when mbo_eadatasize is 0. But
528                  * -ENODATA only makes sense for getxattr()
529                  * and not for listxattr(). */
530                 if (body->mbo_valid & OBD_MD_FLXATTR)
531                         GOTO(out, rc = 0);
532                 else if (obd_md_valid == OBD_MD_FLXATTR)
533                         GOTO(out, rc = -ENODATA);
534                 else
535                         GOTO(out, rc = 0);
536         }
537
538         GOTO(out, rc = body->mbo_eadatasize);
539 out:
540         if (rc < 0) {
541                 ptlrpc_req_finished(*req);
542                 *req = NULL;
543         }
544
545         return rc;
546 }
547
548 static int mdc_get_lustre_md(struct obd_export *exp, struct req_capsule *pill,
549                              struct obd_export *dt_exp,
550                              struct obd_export *md_exp,
551                              struct lustre_md *md)
552 {
553         int rc;
554         ENTRY;
555
556         LASSERT(md);
557         memset(md, 0, sizeof(*md));
558
559         md->body = req_capsule_server_get(pill, &RMF_MDT_BODY);
560         LASSERT(md->body != NULL);
561
562         if (md->body->mbo_valid & OBD_MD_FLEASIZE) {
563                 if (!S_ISREG(md->body->mbo_mode)) {
564                         CDEBUG(D_INFO, "OBD_MD_FLEASIZE set, should be a "
565                                "regular file, but is not\n");
566                         GOTO(out, rc = -EPROTO);
567                 }
568
569                 if (md->body->mbo_eadatasize == 0) {
570                         CDEBUG(D_INFO, "OBD_MD_FLEASIZE set, "
571                                "but eadatasize 0\n");
572                         GOTO(out, rc = -EPROTO);
573                 }
574
575                 md->layout.lb_len = md->body->mbo_eadatasize;
576                 md->layout.lb_buf = req_capsule_server_sized_get(pill,
577                                                         &RMF_MDT_MD,
578                                                         md->layout.lb_len);
579                 if (md->layout.lb_buf == NULL)
580                         GOTO(out, rc = -EPROTO);
581         } else if (md->body->mbo_valid & OBD_MD_FLDIREA) {
582                 const union lmv_mds_md *lmv;
583                 size_t lmv_size;
584
585                 if (!S_ISDIR(md->body->mbo_mode)) {
586                         CDEBUG(D_INFO, "OBD_MD_FLDIREA set, should be a "
587                                "directory, but is not\n");
588                         GOTO(out, rc = -EPROTO);
589                 }
590
591                 if (md_exp->exp_obd->obd_type->typ_lu == &mdc_device_type) {
592                         CERROR("%s: no LMV, upgrading from old version?\n",
593                                md_exp->exp_obd->obd_name);
594
595                         GOTO(out_acl, rc = 0);
596                 }
597
598                 if (md->body->mbo_valid & OBD_MD_MEA) {
599                         lmv_size = md->body->mbo_eadatasize;
600                         if (lmv_size == 0) {
601                                 CDEBUG(D_INFO, "OBD_MD_FLDIREA is set, "
602                                        "but eadatasize 0\n");
603                                 RETURN(-EPROTO);
604                         }
605
606                         lmv = req_capsule_server_sized_get(pill, &RMF_MDT_MD,
607                                                            lmv_size);
608                         if (lmv == NULL)
609                                 GOTO(out, rc = -EPROTO);
610
611                         rc = md_unpackmd(md_exp, &md->lmv, lmv, lmv_size);
612                         if (rc < 0)
613                                 GOTO(out, rc);
614
615                         if (rc < (int)sizeof(*md->lmv)) {
616                                 struct lmv_foreign_md *lfm = md->lfm;
617
618                                 /* short (< sizeof(struct lmv_stripe_md))
619                                  * foreign LMV case
620                                  */
621                                 if (lfm->lfm_magic != LMV_MAGIC_FOREIGN) {
622                                         CDEBUG(D_INFO,
623                                                "lmv size too small: %d < %d\n",
624                                                rc, (int)sizeof(*md->lmv));
625                                         GOTO(out, rc = -EPROTO);
626                                 }
627                         }
628                 }
629
630                 /* since 2.12.58 intent_getattr fetches default LMV */
631                 if (md->body->mbo_valid & OBD_MD_DEFAULT_MEA) {
632                         lmv_size = sizeof(struct lmv_user_md);
633                         lmv = req_capsule_server_sized_get(pill,
634                                                            &RMF_DEFAULT_MDT_MD,
635                                                            lmv_size);
636                         if (!lmv)
637                                 GOTO(out, rc = -EPROTO);
638
639                         rc = md_unpackmd(md_exp, &md->default_lmv, lmv,
640                                          lmv_size);
641                         if (rc < 0)
642                                 GOTO(out, rc);
643
644                         if (rc < (int)sizeof(*md->default_lmv)) {
645                                 CDEBUG(D_INFO,
646                                        "default lmv size too small: %d < %d\n",
647                                         rc, (int)sizeof(*md->default_lmv));
648                                 GOTO(out, rc = -EPROTO);
649                         }
650                 }
651         }
652         rc = 0;
653
654 out_acl:
655         if (md->body->mbo_valid & OBD_MD_FLACL) {
656                 /* for ACL, it's possible that FLACL is set but aclsize is zero.
657                  * only when aclsize != 0 there's an actual segment for ACL
658                  * in reply buffer.
659                  */
660                 rc = mdc_unpack_acl(pill, md);
661                 if (rc)
662                         GOTO(out, rc);
663         }
664
665         EXIT;
666 out:
667         if (rc)
668                 lmd_clear_acl(md);
669
670         return rc;
671 }
672
673 static int mdc_free_lustre_md(struct obd_export *exp, struct lustre_md *md)
674 {
675         ENTRY;
676         RETURN(0);
677 }
678
679 void mdc_replay_open(struct ptlrpc_request *req)
680 {
681         struct md_open_data *mod = req->rq_cb_data;
682         struct ptlrpc_request *close_req;
683         struct obd_client_handle *och;
684         struct lustre_handle old_open_handle = { };
685         struct mdt_body *body;
686         struct ldlm_reply *rep;
687         ENTRY;
688
689         if (mod == NULL) {
690                 DEBUG_REQ(D_ERROR, req,
691                           "cannot properly replay without open data");
692                 EXIT;
693                 return;
694         }
695
696         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
697         LASSERT(body != NULL);
698
699         rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
700         if (rep != NULL && rep->lock_policy_res2 != 0)
701                 DEBUG_REQ(D_ERROR, req, "Open request replay failed with %ld ",
702                         (long int)rep->lock_policy_res2);
703
704         spin_lock(&req->rq_lock);
705         och = mod->mod_och;
706         if (och && och->och_open_handle.cookie)
707                 req->rq_early_free_repbuf = 1;
708         else
709                 req->rq_early_free_repbuf = 0;
710         spin_unlock(&req->rq_lock);
711
712         if (req->rq_early_free_repbuf) {
713                 struct lustre_handle *file_open_handle;
714
715                 LASSERT(och->och_magic == OBD_CLIENT_HANDLE_MAGIC);
716
717                 file_open_handle = &och->och_open_handle;
718                 CDEBUG(D_HA, "updating handle from %#llx to %#llx\n",
719                        file_open_handle->cookie, body->mbo_open_handle.cookie);
720                 old_open_handle = *file_open_handle;
721                 *file_open_handle = body->mbo_open_handle;
722         }
723
724         close_req = mod->mod_close_req;
725         if (close_req) {
726                 __u32 opc = lustre_msg_get_opc(close_req->rq_reqmsg);
727                 struct mdt_ioepoch *epoch;
728
729                 LASSERT(opc == MDS_CLOSE);
730                 epoch = req_capsule_client_get(&close_req->rq_pill,
731                                                &RMF_MDT_EPOCH);
732                 LASSERT(epoch);
733
734                 if (req->rq_early_free_repbuf)
735                         LASSERT(old_open_handle.cookie ==
736                                 epoch->mio_open_handle.cookie);
737
738                 DEBUG_REQ(D_HA, close_req, "updating close body with new fh");
739                 epoch->mio_open_handle = body->mbo_open_handle;
740         }
741         EXIT;
742 }
743
744 void mdc_commit_open(struct ptlrpc_request *req)
745 {
746         struct md_open_data *mod = req->rq_cb_data;
747         if (mod == NULL)
748                 return;
749
750         /**
751          * No need to touch md_open_data::mod_och, it holds a reference on
752          * \var mod and will zero references to each other, \var mod will be
753          * freed after that when md_open_data::mod_och will put the reference.
754          */
755
756         /**
757          * Do not let open request to disappear as it still may be needed
758          * for close rpc to happen (it may happen on evict only, otherwise
759          * ptlrpc_request::rq_replay does not let mdc_commit_open() to be
760          * called), just mark this rpc as committed to distinguish these 2
761          * cases, see mdc_close() for details. The open request reference will
762          * be put along with freeing \var mod.
763          */
764         ptlrpc_request_addref(req);
765         spin_lock(&req->rq_lock);
766         req->rq_committed = 1;
767         spin_unlock(&req->rq_lock);
768         req->rq_cb_data = NULL;
769         obd_mod_put(mod);
770 }
771
772 int mdc_set_open_replay_data(struct obd_export *exp,
773                              struct obd_client_handle *och,
774                              struct lookup_intent *it)
775 {
776         struct md_open_data     *mod;
777         struct mdt_rec_create   *rec;
778         struct mdt_body         *body;
779         struct ptlrpc_request   *open_req = it->it_request;
780         struct obd_import       *imp = open_req->rq_import;
781         ENTRY;
782
783         if (!open_req->rq_replay)
784                 RETURN(0);
785
786         rec = req_capsule_client_get(&open_req->rq_pill, &RMF_REC_REINT);
787         body = req_capsule_server_get(&open_req->rq_pill, &RMF_MDT_BODY);
788         LASSERT(rec != NULL);
789         /* Incoming message in my byte order (it's been swabbed). */
790         /* Outgoing messages always in my byte order. */
791         LASSERT(body != NULL);
792
793         /* Only if the import is replayable, we set replay_open data */
794         if (och && imp->imp_replayable) {
795                 mod = obd_mod_alloc();
796                 if (mod == NULL) {
797                         DEBUG_REQ(D_ERROR, open_req,
798                                   "cannot allocate md_open_data");
799                         RETURN(0);
800                 }
801
802                 /**
803                  * Take a reference on \var mod, to be freed on mdc_close().
804                  * It protects \var mod from being freed on eviction (commit
805                  * callback is called despite rq_replay flag).
806                  * Another reference for \var och.
807                  */
808                 obd_mod_get(mod);
809                 obd_mod_get(mod);
810
811                 spin_lock(&open_req->rq_lock);
812                 och->och_mod = mod;
813                 mod->mod_och = och;
814                 mod->mod_is_create = it_disposition(it, DISP_OPEN_CREATE) ||
815                                      it_disposition(it, DISP_OPEN_STRIPE);
816                 mod->mod_open_req = open_req;
817                 open_req->rq_cb_data = mod;
818                 open_req->rq_commit_cb = mdc_commit_open;
819                 open_req->rq_early_free_repbuf = 1;
820                 spin_unlock(&open_req->rq_lock);
821         }
822
823         rec->cr_fid2 = body->mbo_fid1;
824         rec->cr_open_handle_old = body->mbo_open_handle;
825         open_req->rq_replay_cb = mdc_replay_open;
826         if (!fid_is_sane(&body->mbo_fid1)) {
827                 DEBUG_REQ(D_ERROR, open_req,
828                           "saving replay request with insane FID " DFID,
829                           PFID(&body->mbo_fid1));
830                 LBUG();
831         }
832
833         DEBUG_REQ(D_RPCTRACE, open_req, "Set up open replay data");
834         RETURN(0);
835 }
836
837 static void mdc_free_open(struct md_open_data *mod)
838 {
839         int committed = 0;
840
841         if (mod->mod_is_create == 0 &&
842             imp_connect_disp_stripe(mod->mod_open_req->rq_import))
843                 committed = 1;
844
845         /**
846          * No reason to asssert here if the open request has
847          * rq_replay == 1. It means that mdc_close failed, and
848          * close request wasn`t sent. It is not fatal to client.
849          * The worst thing is eviction if the client gets open lock
850          **/
851
852         DEBUG_REQ(D_RPCTRACE, mod->mod_open_req,
853                   "free open request, rq_replay=%d",
854                   mod->mod_open_req->rq_replay);
855
856         ptlrpc_request_committed(mod->mod_open_req, committed);
857         if (mod->mod_close_req)
858                 ptlrpc_request_committed(mod->mod_close_req, committed);
859 }
860
861 static int mdc_clear_open_replay_data(struct obd_export *exp,
862                                       struct obd_client_handle *och)
863 {
864         struct md_open_data *mod = och->och_mod;
865         ENTRY;
866
867         /**
868          * It is possible to not have \var mod in a case of eviction between
869          * lookup and ll_file_open().
870          **/
871         if (mod == NULL)
872                 RETURN(0);
873
874         LASSERT(mod != LP_POISON);
875         LASSERT(mod->mod_open_req != NULL);
876
877         spin_lock(&mod->mod_open_req->rq_lock);
878         if (mod->mod_och)
879                 mod->mod_och->och_open_handle.cookie = 0;
880         mod->mod_open_req->rq_early_free_repbuf = 0;
881         spin_unlock(&mod->mod_open_req->rq_lock);
882         mdc_free_open(mod);
883
884         mod->mod_och = NULL;
885         och->och_mod = NULL;
886         obd_mod_put(mod);
887
888         RETURN(0);
889 }
890
891 static int mdc_close(struct obd_export *exp, struct md_op_data *op_data,
892                      struct md_open_data *mod, struct ptlrpc_request **request)
893 {
894         struct obd_device     *obd = class_exp2obd(exp);
895         struct ptlrpc_request *req;
896         struct req_format     *req_fmt;
897         size_t                 u32_count = 0;
898         int                    rc;
899         int                    saved_rc = 0;
900         ENTRY;
901
902         CDEBUG(D_INODE, "%s: "DFID" file closed with intent: %x\n",
903                exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
904                op_data->op_bias);
905
906         if (op_data->op_bias & MDS_CLOSE_INTENT) {
907                 req_fmt = &RQF_MDS_CLOSE_INTENT;
908                 if (op_data->op_bias & MDS_HSM_RELEASE) {
909                         /* allocate a FID for volatile file */
910                         rc = mdc_fid_alloc(NULL, exp, &op_data->op_fid2,
911                                            op_data);
912                         if (rc < 0) {
913                                 CERROR("%s: "DFID" allocating FID: rc = %d\n",
914                                        obd->obd_name, PFID(&op_data->op_fid1),
915                                        rc);
916                                 /* save the errcode and proceed to close */
917                                 saved_rc = rc;
918                         }
919                 }
920                 if (op_data->op_bias & MDS_CLOSE_RESYNC_DONE) {
921                         size_t count = op_data->op_data_size / sizeof(__u32);
922
923                         if (count > INLINE_RESYNC_ARRAY_SIZE)
924                                 u32_count = count;
925                 }
926         } else {
927                 req_fmt = &RQF_MDS_CLOSE;
928         }
929
930         *request = NULL;
931         if (OBD_FAIL_CHECK(OBD_FAIL_MDC_CLOSE))
932                 req = NULL;
933         else
934                 req = ptlrpc_request_alloc(class_exp2cliimp(exp), req_fmt);
935
936         /* Ensure that this close's handle is fixed up during replay. */
937         if (likely(mod != NULL)) {
938                 LASSERTF(mod->mod_open_req != NULL &&
939                          mod->mod_open_req->rq_type != LI_POISON,
940                          "POISONED open %p!\n", mod->mod_open_req);
941
942                 mod->mod_close_req = req;
943
944                 DEBUG_REQ(D_RPCTRACE, mod->mod_open_req, "matched open");
945                 /* We no longer want to preserve this open for replay even
946                  * though the open was committed. b=3632, b=3633 */
947                 spin_lock(&mod->mod_open_req->rq_lock);
948                 mod->mod_open_req->rq_replay = 0;
949                 spin_unlock(&mod->mod_open_req->rq_lock);
950         } else {
951                 CDEBUG(D_HA, "couldn't find open req; expecting close error\n");
952         }
953         if (req == NULL) {
954                 /**
955                  * TODO: repeat close after errors
956                  */
957                 CWARN("%s: close of FID "DFID" failed, file reference will be "
958                       "dropped when this client unmounts or is evicted\n",
959                       obd->obd_name, PFID(&op_data->op_fid1));
960                 GOTO(out, rc = -ENOMEM);
961         }
962
963         if (u32_count > 0)
964                 req_capsule_set_size(&req->rq_pill, &RMF_U32, RCL_CLIENT,
965                                      u32_count * sizeof(__u32));
966
967         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_CLOSE);
968         if (rc) {
969                 ptlrpc_request_free(req);
970                 req = NULL;
971                 GOTO(out, rc);
972         }
973
974         /* To avoid a livelock (bug 7034), we need to send CLOSE RPCs to a
975          * portal whose threads are not taking any DLM locks and are therefore
976          * always progressing */
977         req->rq_request_portal = MDS_READPAGE_PORTAL;
978         ptlrpc_at_set_req_timeout(req);
979
980         if (!obd->u.cli.cl_lsom_update ||
981             !(exp_connect_flags2(exp) & OBD_CONNECT2_LSOM))
982                 op_data->op_xvalid &= ~(OP_XVALID_LAZYSIZE |
983                                         OP_XVALID_LAZYBLOCKS);
984
985         mdc_close_pack(&req->rq_pill, op_data);
986
987         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
988                              obd->u.cli.cl_default_mds_easize);
989
990         ptlrpc_request_set_replen(req);
991
992         ptlrpc_get_mod_rpc_slot(req);
993         rc = ptlrpc_queue_wait(req);
994         ptlrpc_put_mod_rpc_slot(req);
995
996         if (req->rq_repmsg == NULL) {
997                 CDEBUG(D_RPCTRACE, "request %p failed to send: rc = %d\n", req,
998                        req->rq_status);
999                 if (rc == 0)
1000                         rc = req->rq_status ?: -EIO;
1001         } else if (rc == 0 || rc == -EAGAIN) {
1002                 struct mdt_body *body;
1003
1004                 rc = lustre_msg_get_status(req->rq_repmsg);
1005                 if (lustre_msg_get_type(req->rq_repmsg) == PTL_RPC_MSG_ERR) {
1006                         DEBUG_REQ(D_ERROR, req,
1007                                   "type = PTL_RPC_MSG_ERR: rc = %d", rc);
1008                         if (rc > 0)
1009                                 rc = -rc;
1010                 }
1011                 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
1012                 if (body == NULL)
1013                         rc = -EPROTO;
1014         } else if (rc == -ESTALE) {
1015                 /**
1016                  * it can be allowed error after 3633 if open was committed and
1017                  * server failed before close was sent. Let's check if mod
1018                  * exists and return no error in that case
1019                  */
1020                 if (mod) {
1021                         DEBUG_REQ(D_HA, req, "Reset ESTALE = %d", rc);
1022                         LASSERT(mod->mod_open_req != NULL);
1023                         if (mod->mod_open_req->rq_committed)
1024                                 rc = 0;
1025                 }
1026         }
1027
1028 out:
1029         if (mod) {
1030                 if (rc != 0)
1031                         mod->mod_close_req = NULL;
1032                 /* Since now, mod is accessed through open_req only,
1033                  * thus close req does not keep a reference on mod anymore. */
1034                 obd_mod_put(mod);
1035         }
1036         *request = req;
1037
1038         RETURN(rc < 0 ? rc : saved_rc);
1039 }
1040
1041 static int mdc_getpage(struct obd_export *exp, const struct lu_fid *fid,
1042                        u64 offset, struct page **pages, int npages,
1043                        struct ptlrpc_request **request)
1044 {
1045         struct ptlrpc_request   *req;
1046         struct ptlrpc_bulk_desc *desc;
1047         int                      i;
1048         int                      resends = 0;
1049         int                      rc;
1050         ENTRY;
1051
1052         *request = NULL;
1053
1054 restart_bulk:
1055         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_READPAGE);
1056         if (req == NULL)
1057                 RETURN(-ENOMEM);
1058
1059         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_READPAGE);
1060         if (rc) {
1061                 ptlrpc_request_free(req);
1062                 RETURN(rc);
1063         }
1064
1065         req->rq_request_portal = MDS_READPAGE_PORTAL;
1066         ptlrpc_at_set_req_timeout(req);
1067
1068         desc = ptlrpc_prep_bulk_imp(req, npages, 1,
1069                                     PTLRPC_BULK_PUT_SINK,
1070                                     MDS_BULK_PORTAL,
1071                                     &ptlrpc_bulk_kiov_pin_ops);
1072         if (desc == NULL) {
1073                 ptlrpc_req_finished(req);
1074                 RETURN(-ENOMEM);
1075         }
1076
1077         /* NB req now owns desc and will free it when it gets freed */
1078         for (i = 0; i < npages; i++)
1079                 desc->bd_frag_ops->add_kiov_frag(desc, pages[i], 0,
1080                                                  PAGE_SIZE);
1081
1082         mdc_readdir_pack(&req->rq_pill, offset, PAGE_SIZE * npages, fid);
1083
1084         ptlrpc_request_set_replen(req);
1085         rc = ptlrpc_queue_wait(req);
1086         if (rc) {
1087                 ptlrpc_req_finished(req);
1088                 if (rc != -ETIMEDOUT)
1089                         RETURN(rc);
1090
1091                 resends++;
1092                 if (!client_should_resend(resends, &exp->exp_obd->u.cli)) {
1093                         CERROR("%s: too many resend retries: rc = %d\n",
1094                                exp->exp_obd->obd_name, -EIO);
1095                         RETURN(-EIO);
1096                 }
1097
1098                 /* If a signal interrupts then the timeout returned will
1099                  * not be zero. In that case return -EINTR
1100                  */
1101                 if (msleep_interruptible(resends * 1000))
1102                         RETURN(-EINTR);
1103
1104                 goto restart_bulk;
1105         }
1106
1107         rc = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk,
1108                                           req->rq_bulk->bd_nob_transferred);
1109         if (rc < 0) {
1110                 ptlrpc_req_finished(req);
1111                 RETURN(rc);
1112         }
1113
1114         if (req->rq_bulk->bd_nob_transferred & ~LU_PAGE_MASK) {
1115                 CERROR("%s: unexpected bytes transferred: %d (%ld expected)\n",
1116                        exp->exp_obd->obd_name, req->rq_bulk->bd_nob_transferred,
1117                        PAGE_SIZE * npages);
1118                 ptlrpc_req_finished(req);
1119                 RETURN(-EPROTO);
1120         }
1121
1122         *request = req;
1123         RETURN(0);
1124 }
1125
1126 static void mdc_release_page(struct page *page, int remove)
1127 {
1128         if (remove) {
1129                 lock_page(page);
1130                 if (likely(page->mapping != NULL))
1131                         delete_from_page_cache(page);
1132                 unlock_page(page);
1133         }
1134         put_page(page);
1135 }
1136
1137 static struct page *mdc_page_locate(struct address_space *mapping, __u64 *hash,
1138                                     __u64 *start, __u64 *end, int hash64)
1139 {
1140         /*
1141          * Complement of hash is used as an index so that
1142          * radix_tree_gang_lookup() can be used to find a page with starting
1143          * hash _smaller_ than one we are looking for.
1144          */
1145         unsigned long offset = hash_x_index(*hash, hash64);
1146         struct page *page;
1147         unsigned long flags;
1148         int found;
1149
1150         ll_xa_lock_irqsave(&mapping->i_pages, flags);
1151         found = radix_tree_gang_lookup(&mapping->page_tree,
1152                                        (void **)&page, offset, 1);
1153         if (found > 0 && !ll_xa_is_value(page)) {
1154                 struct lu_dirpage *dp;
1155
1156                 get_page(page);
1157                 ll_xa_unlock_irqrestore(&mapping->i_pages, flags);
1158                 /*
1159                  * In contrast to find_lock_page() we are sure that directory
1160                  * page cannot be truncated (while DLM lock is held) and,
1161                  * hence, can avoid restart.
1162                  *
1163                  * In fact, page cannot be locked here at all, because
1164                  * mdc_read_page_remote does synchronous io.
1165                  */
1166                 wait_on_page_locked(page);
1167                 if (PageUptodate(page)) {
1168                         dp = kmap(page);
1169                         if (BITS_PER_LONG == 32 && hash64) {
1170                                 *start = le64_to_cpu(dp->ldp_hash_start) >> 32;
1171                                 *end   = le64_to_cpu(dp->ldp_hash_end) >> 32;
1172                                 *hash  = *hash >> 32;
1173                         } else {
1174                                 *start = le64_to_cpu(dp->ldp_hash_start);
1175                                 *end   = le64_to_cpu(dp->ldp_hash_end);
1176                         }
1177                         if (unlikely(*start == 1 && *hash == 0))
1178                                 *hash = *start;
1179                         else
1180                                 LASSERTF(*start <= *hash, "start = %#llx"
1181                                          ",end = %#llx,hash = %#llx\n",
1182                                          *start, *end, *hash);
1183                         CDEBUG(D_VFSTRACE, "offset %lx [%#llx %#llx],"
1184                               " hash %#llx\n", offset, *start, *end, *hash);
1185                         if (*hash > *end) {
1186                                 kunmap(page);
1187                                 mdc_release_page(page, 0);
1188                                 page = NULL;
1189                         } else if (*end != *start && *hash == *end) {
1190                                 /*
1191                                  * upon hash collision, remove this page,
1192                                  * otherwise put page reference, and
1193                                  * mdc_read_page_remote() will issue RPC to
1194                                  * fetch the page we want.
1195                                  */
1196                                 kunmap(page);
1197                                 mdc_release_page(page,
1198                                     le32_to_cpu(dp->ldp_flags) & LDF_COLLIDE);
1199                                 page = NULL;
1200                         }
1201                 } else {
1202                         put_page(page);
1203                         page = ERR_PTR(-EIO);
1204                 }
1205         } else {
1206                 ll_xa_unlock_irqrestore(&mapping->i_pages, flags);
1207                 page = NULL;
1208         }
1209         return page;
1210 }
1211
1212 /*
1213  * Adjust a set of pages, each page containing an array of lu_dirpages,
1214  * so that each page can be used as a single logical lu_dirpage.
1215  *
1216  * A lu_dirpage is laid out as follows, where s = ldp_hash_start,
1217  * e = ldp_hash_end, f = ldp_flags, p = padding, and each "ent" is a
1218  * struct lu_dirent.  It has size up to LU_PAGE_SIZE. The ldp_hash_end
1219  * value is used as a cookie to request the next lu_dirpage in a
1220  * directory listing that spans multiple pages (two in this example):
1221  *   ________
1222  *  |        |
1223  * .|--------v-------   -----.
1224  * |s|e|f|p|ent|ent| ... |ent|
1225  * '--|--------------   -----'   Each PAGE contains a single
1226  *    '------.                   lu_dirpage.
1227  * .---------v-------   -----.
1228  * |s|e|f|p|ent| 0 | ... | 0 |
1229  * '-----------------   -----'
1230  *
1231  * However, on hosts where the native VM page size (PAGE_SIZE) is
1232  * larger than LU_PAGE_SIZE, a single host page may contain multiple
1233  * lu_dirpages. After reading the lu_dirpages from the MDS, the
1234  * ldp_hash_end of the first lu_dirpage refers to the one immediately
1235  * after it in the same PAGE (arrows simplified for brevity, but
1236  * in general e0==s1, e1==s2, etc.):
1237  *
1238  * .--------------------   -----.
1239  * |s0|e0|f0|p|ent|ent| ... |ent|
1240  * |---v----------------   -----|
1241  * |s1|e1|f1|p|ent|ent| ... |ent|
1242  * |---v----------------   -----|  Here, each PAGE contains
1243  *             ...                 multiple lu_dirpages.
1244  * |---v----------------   -----|
1245  * |s'|e'|f'|p|ent|ent| ... |ent|
1246  * '---|----------------   -----'
1247  *     v
1248  * .----------------------------.
1249  * |        next PAGE           |
1250  *
1251  * This structure is transformed into a single logical lu_dirpage as follows:
1252  *
1253  * - Replace e0 with e' so the request for the next lu_dirpage gets the page
1254  *   labeled 'next PAGE'.
1255  *
1256  * - Copy the LDF_COLLIDE flag from f' to f0 to correctly reflect whether
1257  *   a hash collision with the next page exists.
1258  *
1259  * - Adjust the lde_reclen of the ending entry of each lu_dirpage to span
1260  *   to the first entry of the next lu_dirpage.
1261  */
1262 #if PAGE_SIZE > LU_PAGE_SIZE
1263 static void mdc_adjust_dirpages(struct page **pages, int cfs_pgs, int lu_pgs)
1264 {
1265         int i;
1266
1267         for (i = 0; i < cfs_pgs; i++) {
1268                 struct lu_dirpage *dp = kmap(pages[i]);
1269                 struct lu_dirpage *first = dp;
1270                 struct lu_dirent *end_dirent = NULL;
1271                 struct lu_dirent *ent;
1272                 __u64 hash_end = dp->ldp_hash_end;
1273                 __u32 flags = dp->ldp_flags;
1274
1275                 while (--lu_pgs > 0) {
1276                         ent = lu_dirent_start(dp);
1277                         for (end_dirent = ent; ent != NULL;
1278                              end_dirent = ent, ent = lu_dirent_next(ent));
1279
1280                         /* Advance dp to next lu_dirpage. */
1281                         dp = (struct lu_dirpage *)((char *)dp + LU_PAGE_SIZE);
1282
1283                         /* Check if we've reached the end of the PAGE. */
1284                         if (!((unsigned long)dp & ~PAGE_MASK))
1285                                 break;
1286
1287                         /* Save the hash and flags of this lu_dirpage. */
1288                         hash_end = dp->ldp_hash_end;
1289                         flags = dp->ldp_flags;
1290
1291                         /* Check if lu_dirpage contains no entries. */
1292                         if (end_dirent == NULL)
1293                                 break;
1294
1295                         /* Enlarge the end entry lde_reclen from 0 to
1296                          * first entry of next lu_dirpage. */
1297                         LASSERT(le16_to_cpu(end_dirent->lde_reclen) == 0);
1298                         end_dirent->lde_reclen =
1299                                 cpu_to_le16((char *)(dp->ldp_entries) -
1300                                             (char *)end_dirent);
1301                 }
1302
1303                 first->ldp_hash_end = hash_end;
1304                 first->ldp_flags &= ~cpu_to_le32(LDF_COLLIDE);
1305                 first->ldp_flags |= flags & cpu_to_le32(LDF_COLLIDE);
1306
1307                 kunmap(pages[i]);
1308         }
1309         LASSERTF(lu_pgs == 0, "left = %d\n", lu_pgs);
1310 }
1311 #else
1312 #define mdc_adjust_dirpages(pages, cfs_pgs, lu_pgs) do {} while (0)
1313 #endif  /* PAGE_SIZE > LU_PAGE_SIZE */
1314
1315 /* parameters for readdir page */
1316 struct readpage_param {
1317         struct md_op_data       *rp_mod;
1318         __u64                   rp_off;
1319         int                     rp_hash64;
1320         struct obd_export       *rp_exp;
1321 };
1322
1323 /**
1324  * Read pages from server.
1325  *
1326  * Page in MDS_READPAGE RPC is packed in LU_PAGE_SIZE, and each page contains
1327  * a header lu_dirpage which describes the start/end hash, and whether this
1328  * page is empty (contains no dir entry) or hash collide with next page.
1329  * After client receives reply, several pages will be integrated into dir page
1330  * in PAGE_SIZE (if PAGE_SIZE greater than LU_PAGE_SIZE), and the
1331  * lu_dirpage for this integrated page will be adjusted.
1332  **/
1333 static int mdc_read_page_remote(void *data, struct page *page0)
1334 {
1335         struct readpage_param *rp = data;
1336         struct page **page_pool;
1337         struct page *page;
1338         struct lu_dirpage *dp;
1339         struct md_op_data *op_data = rp->rp_mod;
1340         struct ptlrpc_request *req;
1341         int max_pages;
1342         struct inode *inode;
1343         struct lu_fid *fid;
1344         int rd_pgs = 0; /* number of pages actually read */
1345         int npages;
1346         int i;
1347         int rc;
1348         ENTRY;
1349
1350         max_pages = rp->rp_exp->exp_obd->u.cli.cl_max_pages_per_rpc;
1351         inode = op_data->op_data;
1352         fid = &op_data->op_fid1;
1353         LASSERT(inode != NULL);
1354
1355         OBD_ALLOC_PTR_ARRAY_LARGE(page_pool, max_pages);
1356         if (page_pool != NULL) {
1357                 page_pool[0] = page0;
1358         } else {
1359                 page_pool = &page0;
1360                 max_pages = 1;
1361         }
1362
1363         for (npages = 1; npages < max_pages; npages++) {
1364                 page = page_cache_alloc(inode->i_mapping);
1365                 if (page == NULL)
1366                         break;
1367                 page_pool[npages] = page;
1368         }
1369
1370         rc = mdc_getpage(rp->rp_exp, fid, rp->rp_off, page_pool, npages, &req);
1371         if (rc < 0) {
1372                 /* page0 is special, which was added into page cache early */
1373                 delete_from_page_cache(page0);
1374         } else {
1375                 int lu_pgs;
1376
1377                 rd_pgs = (req->rq_bulk->bd_nob_transferred + PAGE_SIZE - 1) >>
1378                         PAGE_SHIFT;
1379                 lu_pgs = req->rq_bulk->bd_nob_transferred >> LU_PAGE_SHIFT;
1380                 LASSERT(!(req->rq_bulk->bd_nob_transferred & ~LU_PAGE_MASK));
1381
1382                 CDEBUG(D_INODE, "read %d(%d) pages\n", rd_pgs, lu_pgs);
1383
1384                 mdc_adjust_dirpages(page_pool, rd_pgs, lu_pgs);
1385
1386                 SetPageUptodate(page0);
1387         }
1388         unlock_page(page0);
1389
1390         ptlrpc_req_finished(req);
1391         CDEBUG(D_CACHE, "read %d/%d pages\n", rd_pgs, npages);
1392         for (i = 1; i < npages; i++) {
1393                 unsigned long   offset;
1394                 __u64           hash;
1395                 int ret;
1396
1397                 page = page_pool[i];
1398
1399                 if (rc < 0 || i >= rd_pgs) {
1400                         put_page(page);
1401                         continue;
1402                 }
1403
1404                 SetPageUptodate(page);
1405
1406                 dp = kmap(page);
1407                 hash = le64_to_cpu(dp->ldp_hash_start);
1408                 kunmap(page);
1409
1410                 offset = hash_x_index(hash, rp->rp_hash64);
1411
1412                 prefetchw(&page->flags);
1413                 ret = add_to_page_cache_lru(page, inode->i_mapping, offset,
1414                                             GFP_KERNEL);
1415                 if (ret == 0)
1416                         unlock_page(page);
1417                 else
1418                         CDEBUG(D_VFSTRACE, "page %lu add to page cache failed:"
1419                                " rc = %d\n", offset, ret);
1420                 put_page(page);
1421         }
1422
1423         if (page_pool != &page0)
1424                 OBD_FREE_PTR_ARRAY_LARGE(page_pool, max_pages);
1425
1426         RETURN(rc);
1427 }
1428
1429 /**
1430  * Read dir page from cache first, if it can not find it, read it from
1431  * server and add into the cache.
1432  *
1433  * \param[in] exp       MDC export
1434  * \param[in] op_data   client MD stack parameters, transfering parameters
1435  *                      between different layers on client MD stack.
1436  * \param[in] mrinfo    callback required for ldlm lock enqueue during
1437  *                      read page
1438  * \param[in] hash_offset the hash offset of the page to be read
1439  * \param[in] ppage     the page to be read
1440  *
1441  * retval               = 0 get the page successfully
1442  *                      errno(<0) get the page failed
1443  */
1444 static int mdc_read_page(struct obd_export *exp, struct md_op_data *op_data,
1445                          struct md_readdir_info *mrinfo, __u64 hash_offset,
1446                          struct page **ppage)
1447 {
1448         struct lookup_intent    it = { .it_op = IT_READDIR };
1449         struct page             *page;
1450         struct inode            *dir = op_data->op_data;
1451         struct address_space    *mapping;
1452         struct lu_dirpage       *dp;
1453         __u64                   start = 0;
1454         __u64                   end = 0;
1455         struct lustre_handle    lockh;
1456         struct ptlrpc_request   *enq_req = NULL;
1457         struct readpage_param   rp_param;
1458         int rc;
1459
1460         ENTRY;
1461
1462         *ppage = NULL;
1463
1464         LASSERT(dir != NULL);
1465         mapping = dir->i_mapping;
1466
1467         rc = mdc_intent_lock(exp, op_data, &it, &enq_req,
1468                              mrinfo->mr_blocking_ast, 0);
1469         if (enq_req != NULL)
1470                 ptlrpc_req_finished(enq_req);
1471
1472         if (rc < 0) {
1473                 CERROR("%s: "DFID" lock enqueue fails: rc = %d\n",
1474                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1), rc);
1475                 RETURN(rc);
1476         }
1477
1478         rc = 0;
1479         lockh.cookie = it.it_lock_handle;
1480         mdc_set_lock_data(exp, &lockh, dir, NULL);
1481
1482         rp_param.rp_off = hash_offset;
1483         rp_param.rp_hash64 = op_data->op_cli_flags & CLI_HASH64;
1484         page = mdc_page_locate(mapping, &rp_param.rp_off, &start, &end,
1485                                rp_param.rp_hash64);
1486         if (IS_ERR(page)) {
1487                 CERROR("%s: dir page locate: "DFID" at %llu: rc %ld\n",
1488                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1489                        rp_param.rp_off, PTR_ERR(page));
1490                 GOTO(out_unlock, rc = PTR_ERR(page));
1491         } else if (page != NULL) {
1492                 /*
1493                  * XXX nikita: not entirely correct handling of a corner case:
1494                  * suppose hash chain of entries with hash value HASH crosses
1495                  * border between pages P0 and P1. First both P0 and P1 are
1496                  * cached, seekdir() is called for some entry from the P0 part
1497                  * of the chain. Later P0 goes out of cache. telldir(HASH)
1498                  * happens and finds P1, as it starts with matching hash
1499                  * value. Remaining entries from P0 part of the chain are
1500                  * skipped. (Is that really a bug?)
1501                  *
1502                  * Possible solutions: 0. don't cache P1 is such case, handle
1503                  * it as an "overflow" page. 1. invalidate all pages at
1504                  * once. 2. use HASH|1 as an index for P1.
1505                  */
1506                 GOTO(hash_collision, page);
1507         }
1508
1509         rp_param.rp_exp = exp;
1510         rp_param.rp_mod = op_data;
1511         page = read_cache_page(mapping,
1512                                hash_x_index(rp_param.rp_off,
1513                                             rp_param.rp_hash64),
1514                                mdc_read_page_remote, &rp_param);
1515         if (IS_ERR(page)) {
1516                 CDEBUG(D_INFO, "%s: read cache page: "DFID" at %llu: %ld\n",
1517                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1518                        rp_param.rp_off, PTR_ERR(page));
1519                 GOTO(out_unlock, rc = PTR_ERR(page));
1520         }
1521
1522         wait_on_page_locked(page);
1523         (void)kmap(page);
1524         if (!PageUptodate(page)) {
1525                 CERROR("%s: page not updated: "DFID" at %llu: rc %d\n",
1526                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1527                        rp_param.rp_off, -5);
1528                 goto fail;
1529         }
1530         if (!PageChecked(page))
1531                 SetPageChecked(page);
1532         if (PageError(page)) {
1533                 CERROR("%s: page error: "DFID" at %llu: rc %d\n",
1534                        exp->exp_obd->obd_name, PFID(&op_data->op_fid1),
1535                        rp_param.rp_off, -5);
1536                 goto fail;
1537         }
1538
1539 hash_collision:
1540         dp = page_address(page);
1541         if (BITS_PER_LONG == 32 && rp_param.rp_hash64) {
1542                 start = le64_to_cpu(dp->ldp_hash_start) >> 32;
1543                 end   = le64_to_cpu(dp->ldp_hash_end) >> 32;
1544                 rp_param.rp_off = hash_offset >> 32;
1545         } else {
1546                 start = le64_to_cpu(dp->ldp_hash_start);
1547                 end   = le64_to_cpu(dp->ldp_hash_end);
1548                 rp_param.rp_off = hash_offset;
1549         }
1550         if (end == start) {
1551                 LASSERT(start == rp_param.rp_off);
1552                 CWARN("Page-wide hash collision: %#lx\n", (unsigned long)end);
1553 #if BITS_PER_LONG == 32
1554                 CWARN("Real page-wide hash collision at [%llu %llu] with "
1555                       "hash %llu\n", le64_to_cpu(dp->ldp_hash_start),
1556                       le64_to_cpu(dp->ldp_hash_end), hash_offset);
1557 #endif
1558
1559                 /*
1560                  * Fetch whole overflow chain...
1561                  *
1562                  * XXX not yet.
1563                  */
1564                 goto fail;
1565         }
1566         *ppage = page;
1567 out_unlock:
1568         ldlm_lock_decref(&lockh, it.it_lock_mode);
1569         return rc;
1570 fail:
1571         kunmap(page);
1572         mdc_release_page(page, 1);
1573         rc = -EIO;
1574         goto out_unlock;
1575 }
1576
1577 static int mdc_statfs_interpret(const struct lu_env *env,
1578                                 struct ptlrpc_request *req, void *args, int rc)
1579 {
1580         struct obd_info *oinfo = args;
1581         struct obd_statfs *osfs;
1582
1583         if (!rc) {
1584                 osfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
1585                 if (!osfs)
1586                         return -EPROTO;
1587
1588                 oinfo->oi_osfs = osfs;
1589
1590                 CDEBUG(D_CACHE, "blocks=%llu free=%llu avail=%llu "
1591                        "objects=%llu free=%llu state=%x\n",
1592                         osfs->os_blocks, osfs->os_bfree, osfs->os_bavail,
1593                         osfs->os_files, osfs->os_ffree, osfs->os_state);
1594         }
1595
1596         oinfo->oi_cb_up(oinfo, rc);
1597
1598         return rc;
1599 }
1600
1601 static int mdc_statfs_async(struct obd_export *exp,
1602                             struct obd_info *oinfo, time64_t max_age,
1603                             struct ptlrpc_request_set *unused)
1604 {
1605         struct ptlrpc_request *req;
1606         struct obd_info *aa;
1607
1608         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp), &RQF_MDS_STATFS,
1609                                         LUSTRE_MDS_VERSION, MDS_STATFS);
1610         if (req == NULL)
1611                 return -ENOMEM;
1612
1613         ptlrpc_request_set_replen(req);
1614         req->rq_interpret_reply = mdc_statfs_interpret;
1615
1616         aa = ptlrpc_req_async_args(aa, req);
1617         *aa = *oinfo;
1618
1619         ptlrpcd_add_req(req);
1620
1621         return 0;
1622 }
1623
1624 static int mdc_statfs(const struct lu_env *env,
1625                       struct obd_export *exp, struct obd_statfs *osfs,
1626                       time64_t max_age, __u32 flags)
1627 {
1628         struct obd_device *obd = class_exp2obd(exp);
1629         struct req_format *fmt;
1630         struct ptlrpc_request *req;
1631         struct obd_statfs *msfs;
1632         struct obd_import *imp, *imp0;
1633         int rc;
1634         ENTRY;
1635
1636         /*
1637          * Since the request might also come from lprocfs, so we need
1638          * sync this with client_disconnect_export Bug15684
1639          */
1640         with_imp_locked(obd, imp0, rc)
1641                 imp = class_import_get(imp0);
1642         if (rc)
1643                 RETURN(rc);
1644
1645         fmt = &RQF_MDS_STATFS;
1646         if ((exp_connect_flags2(exp) & OBD_CONNECT2_SUM_STATFS) &&
1647             (flags & OBD_STATFS_SUM))
1648                 fmt = &RQF_MDS_STATFS_NEW;
1649         req = ptlrpc_request_alloc_pack(imp, fmt, LUSTRE_MDS_VERSION,
1650                                         MDS_STATFS);
1651         if (req == NULL)
1652                 GOTO(output, rc = -ENOMEM);
1653         req->rq_allow_intr = 1;
1654
1655         if ((flags & OBD_STATFS_SUM) &&
1656             (exp_connect_flags2(exp) & OBD_CONNECT2_SUM_STATFS)) {
1657                 /* request aggregated states */
1658                 struct mdt_body *body;
1659
1660                 body = req_capsule_client_get(&req->rq_pill, &RMF_MDT_BODY);
1661                 if (body == NULL)
1662                         GOTO(out, rc = -EPROTO);
1663                 body->mbo_valid = OBD_MD_FLAGSTATFS;
1664         }
1665
1666         ptlrpc_request_set_replen(req);
1667
1668         if (flags & OBD_STATFS_NODELAY) {
1669                 /* procfs requests not want stay in wait for avoid deadlock */
1670                 req->rq_no_resend = 1;
1671                 req->rq_no_delay = 1;
1672         }
1673
1674         rc = ptlrpc_queue_wait(req);
1675         if (rc) {
1676                 /* check connection error first */
1677                 if (imp->imp_connect_error)
1678                         rc = imp->imp_connect_error;
1679                 GOTO(out, rc);
1680         }
1681
1682         msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS);
1683         if (msfs == NULL)
1684                 GOTO(out, rc = -EPROTO);
1685
1686         *osfs = *msfs;
1687         EXIT;
1688 out:
1689         ptlrpc_req_finished(req);
1690 output:
1691         class_import_put(imp);
1692         return rc;
1693 }
1694
1695 static int mdc_ioc_fid2path(struct obd_export *exp, struct getinfo_fid2path *gf)
1696 {
1697         __u32 keylen, vallen;
1698         void *key;
1699         int rc;
1700
1701         if (gf->gf_pathlen > PATH_MAX)
1702                 RETURN(-ENAMETOOLONG);
1703         if (gf->gf_pathlen < 2)
1704                 RETURN(-EOVERFLOW);
1705
1706         /* Key is KEY_FID2PATH + getinfo_fid2path description */
1707         keylen = cfs_size_round(sizeof(KEY_FID2PATH) + sizeof(*gf) +
1708                                 sizeof(struct lu_fid));
1709         OBD_ALLOC(key, keylen);
1710         if (key == NULL)
1711                 RETURN(-ENOMEM);
1712         memcpy(key, KEY_FID2PATH, sizeof(KEY_FID2PATH));
1713         memcpy(key + cfs_size_round(sizeof(KEY_FID2PATH)), gf, sizeof(*gf));
1714         memcpy(key + cfs_size_round(sizeof(KEY_FID2PATH)) + sizeof(*gf),
1715                gf->gf_u.gf_root_fid, sizeof(struct lu_fid));
1716         CDEBUG(D_IOCTL, "path get "DFID" from %llu #%d\n",
1717                PFID(&gf->gf_fid), gf->gf_recno, gf->gf_linkno);
1718
1719         if (!fid_is_sane(&gf->gf_fid))
1720                 GOTO(out, rc = -EINVAL);
1721
1722         /* Val is struct getinfo_fid2path result plus path */
1723         vallen = sizeof(*gf) + gf->gf_pathlen;
1724
1725         rc = obd_get_info(NULL, exp, keylen, key, &vallen, gf);
1726         if (rc != 0 && rc != -EREMOTE)
1727                 GOTO(out, rc);
1728
1729         if (vallen <= sizeof(*gf))
1730                 GOTO(out, rc = -EPROTO);
1731         if (vallen > sizeof(*gf) + gf->gf_pathlen)
1732                 GOTO(out, rc = -EOVERFLOW);
1733
1734         CDEBUG(D_IOCTL, "path got "DFID" from %llu #%d: %s\n",
1735                PFID(&gf->gf_fid), gf->gf_recno, gf->gf_linkno,
1736                gf->gf_pathlen < 512 ? gf->gf_u.gf_path :
1737                /* only log the last 512 characters of the path */
1738                gf->gf_u.gf_path + gf->gf_pathlen - 512);
1739
1740 out:
1741         OBD_FREE(key, keylen);
1742         return rc;
1743 }
1744
1745 static int mdc_ioc_hsm_progress(struct obd_export *exp,
1746                                 struct hsm_progress_kernel *hpk)
1747 {
1748         struct obd_import               *imp = class_exp2cliimp(exp);
1749         struct hsm_progress_kernel      *req_hpk;
1750         struct ptlrpc_request           *req;
1751         int                              rc;
1752         ENTRY;
1753
1754         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_HSM_PROGRESS,
1755                                         LUSTRE_MDS_VERSION, MDS_HSM_PROGRESS);
1756         if (req == NULL)
1757                 GOTO(out, rc = -ENOMEM);
1758
1759         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
1760
1761         /* Copy hsm_progress struct */
1762         req_hpk = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_PROGRESS);
1763         if (req_hpk == NULL)
1764                 GOTO(out, rc = -EPROTO);
1765
1766         *req_hpk = *hpk;
1767         req_hpk->hpk_errval = lustre_errno_hton(hpk->hpk_errval);
1768
1769         ptlrpc_request_set_replen(req);
1770
1771         ptlrpc_get_mod_rpc_slot(req);
1772         rc = ptlrpc_queue_wait(req);
1773         ptlrpc_put_mod_rpc_slot(req);
1774
1775         GOTO(out, rc);
1776 out:
1777         ptlrpc_req_finished(req);
1778         return rc;
1779 }
1780 /**
1781  * Send hsm_ct_register to MDS
1782  *
1783  * \param[in]   imp             import
1784  * \param[in]   archive_count   if in bitmap format, it is the bitmap,
1785  *                              else it is the count of archive_ids
1786  * \param[in]   archives        if in bitmap format, it is NULL,
1787  *                              else it is archive_id lists
1788  */
1789 static int mdc_ioc_hsm_ct_register(struct obd_import *imp, __u32 archive_count,
1790                                    __u32 *archives)
1791 {
1792         struct ptlrpc_request *req;
1793         __u32 *archive_array;
1794         size_t archives_size;
1795         int rc;
1796         ENTRY;
1797
1798         req = ptlrpc_request_alloc(imp, &RQF_MDS_HSM_CT_REGISTER);
1799         if (req == NULL)
1800                 RETURN(-ENOMEM);
1801
1802         if (archives != NULL)
1803                 archives_size = sizeof(*archive_array) * archive_count;
1804         else
1805                 archives_size = sizeof(archive_count);
1806
1807         req_capsule_set_size(&req->rq_pill, &RMF_MDS_HSM_ARCHIVE,
1808                              RCL_CLIENT, archives_size);
1809
1810         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_CT_REGISTER);
1811         if (rc) {
1812                 ptlrpc_request_free(req);
1813                 RETURN(-ENOMEM);
1814         }
1815
1816         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
1817
1818         archive_array = req_capsule_client_get(&req->rq_pill,
1819                                                &RMF_MDS_HSM_ARCHIVE);
1820         if (archive_array == NULL)
1821                 GOTO(out, rc = -EPROTO);
1822
1823         if (archives != NULL)
1824                 memcpy(archive_array, archives, archives_size);
1825         else
1826                 *archive_array = archive_count;
1827
1828         ptlrpc_request_set_replen(req);
1829         req->rq_no_resend = 1;
1830
1831         rc = mdc_queue_wait(req);
1832         GOTO(out, rc);
1833 out:
1834         ptlrpc_req_finished(req);
1835         return rc;
1836 }
1837
1838 static int mdc_ioc_hsm_current_action(struct obd_export *exp,
1839                                       struct md_op_data *op_data)
1840 {
1841         struct hsm_current_action       *hca = op_data->op_data;
1842         struct hsm_current_action       *req_hca;
1843         struct ptlrpc_request           *req;
1844         int                              rc;
1845         ENTRY;
1846
1847         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1848                                    &RQF_MDS_HSM_ACTION);
1849         if (req == NULL)
1850                 RETURN(-ENOMEM);
1851
1852         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_ACTION);
1853         if (rc) {
1854                 ptlrpc_request_free(req);
1855                 RETURN(rc);
1856         }
1857
1858         mdc_pack_body(&req->rq_pill, &op_data->op_fid1, 0, 0,
1859                       op_data->op_suppgids[0], 0);
1860
1861         ptlrpc_request_set_replen(req);
1862
1863         rc = mdc_queue_wait(req);
1864         if (rc)
1865                 GOTO(out, rc);
1866
1867         req_hca = req_capsule_server_get(&req->rq_pill,
1868                                          &RMF_MDS_HSM_CURRENT_ACTION);
1869         if (req_hca == NULL)
1870                 GOTO(out, rc = -EPROTO);
1871
1872         *hca = *req_hca;
1873
1874         EXIT;
1875 out:
1876         ptlrpc_req_finished(req);
1877         return rc;
1878 }
1879
1880 static int mdc_ioc_hsm_ct_unregister(struct obd_import *imp)
1881 {
1882         struct ptlrpc_request   *req;
1883         int                      rc;
1884         ENTRY;
1885
1886         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_HSM_CT_UNREGISTER,
1887                                         LUSTRE_MDS_VERSION,
1888                                         MDS_HSM_CT_UNREGISTER);
1889         if (req == NULL)
1890                 GOTO(out, rc = -ENOMEM);
1891
1892         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
1893
1894         ptlrpc_request_set_replen(req);
1895
1896         rc = mdc_queue_wait(req);
1897         GOTO(out, rc);
1898 out:
1899         ptlrpc_req_finished(req);
1900         return rc;
1901 }
1902
1903 static int mdc_ioc_hsm_state_get(struct obd_export *exp,
1904                                  struct md_op_data *op_data)
1905 {
1906         struct hsm_user_state   *hus = op_data->op_data;
1907         struct hsm_user_state   *req_hus;
1908         struct ptlrpc_request   *req;
1909         int                      rc;
1910         ENTRY;
1911
1912         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1913                                    &RQF_MDS_HSM_STATE_GET);
1914         if (req == NULL)
1915                 RETURN(-ENOMEM);
1916
1917         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_STATE_GET);
1918         if (rc != 0) {
1919                 ptlrpc_request_free(req);
1920                 RETURN(rc);
1921         }
1922
1923         mdc_pack_body(&req->rq_pill, &op_data->op_fid1, 0, 0,
1924                       op_data->op_suppgids[0], 0);
1925
1926         ptlrpc_request_set_replen(req);
1927
1928         rc = mdc_queue_wait(req);
1929         if (rc)
1930                 GOTO(out, rc);
1931
1932         req_hus = req_capsule_server_get(&req->rq_pill, &RMF_HSM_USER_STATE);
1933         if (req_hus == NULL)
1934                 GOTO(out, rc = -EPROTO);
1935
1936         *hus = *req_hus;
1937
1938         EXIT;
1939 out:
1940         ptlrpc_req_finished(req);
1941         return rc;
1942 }
1943
1944 static int mdc_ioc_hsm_state_set(struct obd_export *exp,
1945                                  struct md_op_data *op_data)
1946 {
1947         struct hsm_state_set    *hss = op_data->op_data;
1948         struct hsm_state_set    *req_hss;
1949         struct ptlrpc_request   *req;
1950         int                      rc;
1951         ENTRY;
1952
1953         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
1954                                    &RQF_MDS_HSM_STATE_SET);
1955         if (req == NULL)
1956                 RETURN(-ENOMEM);
1957
1958         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_STATE_SET);
1959         if (rc) {
1960                 ptlrpc_request_free(req);
1961                 RETURN(rc);
1962         }
1963
1964         mdc_pack_body(&req->rq_pill, &op_data->op_fid1, 0, 0,
1965                       op_data->op_suppgids[0], 0);
1966
1967         /* Copy states */
1968         req_hss = req_capsule_client_get(&req->rq_pill, &RMF_HSM_STATE_SET);
1969         if (req_hss == NULL)
1970                 GOTO(out, rc = -EPROTO);
1971         *req_hss = *hss;
1972
1973         ptlrpc_request_set_replen(req);
1974
1975         ptlrpc_get_mod_rpc_slot(req);
1976         rc = ptlrpc_queue_wait(req);
1977         ptlrpc_put_mod_rpc_slot(req);
1978
1979         GOTO(out, rc);
1980 out:
1981         ptlrpc_req_finished(req);
1982         return rc;
1983 }
1984
1985 /* For RESTORE and RELEASE the mdt will take EX lock on the file layout.
1986  * So we can use early cancel on client side locks for that resource.
1987  */
1988 static inline int mdc_hsm_request_lock_to_cancel(struct obd_export *exp,
1989                                                  struct hsm_user_request *hur,
1990                                                  struct list_head *cancels)
1991 {
1992         struct hsm_user_item *hui = &hur->hur_user_item[0];
1993         struct hsm_request *req_hr = &hur->hur_request;
1994         int count = 0;
1995         int i;
1996
1997         if (req_hr->hr_action != HUA_RESTORE &&
1998             req_hr->hr_action != HUA_RELEASE)
1999                 return 0;
2000
2001         for (i = 0; i < req_hr->hr_itemcount; i++, hui++) {
2002                 if (!fid_is_sane(&hui->hui_fid))
2003                         continue;
2004                 count += mdc_resource_get_unused(exp, &hui->hui_fid, cancels,
2005                                                  LCK_EX, MDS_INODELOCK_LAYOUT);
2006         }
2007
2008         return count;
2009 }
2010
2011 static int mdc_ioc_hsm_request(struct obd_export *exp,
2012                                struct hsm_user_request *hur)
2013 {
2014         struct obd_import *imp = class_exp2cliimp(exp);
2015         struct ptlrpc_request *req;
2016         struct hsm_request *req_hr;
2017         struct hsm_user_item *req_hui;
2018         char *req_opaque;
2019         LIST_HEAD(cancels);
2020         int count;
2021         int rc;
2022         ENTRY;
2023
2024         req = ptlrpc_request_alloc(imp, &RQF_MDS_HSM_REQUEST);
2025         if (req == NULL)
2026                 RETURN(-ENOMEM);
2027
2028         req_capsule_set_size(&req->rq_pill, &RMF_MDS_HSM_USER_ITEM, RCL_CLIENT,
2029                              hur->hur_request.hr_itemcount
2030                              * sizeof(struct hsm_user_item));
2031         req_capsule_set_size(&req->rq_pill, &RMF_GENERIC_DATA, RCL_CLIENT,
2032                              hur->hur_request.hr_data_len);
2033
2034         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_HSM_REQUEST);
2035         if (rc) {
2036                 ptlrpc_request_free(req);
2037                 RETURN(rc);
2038         }
2039
2040         /* Cancel existing locks */
2041         count = mdc_hsm_request_lock_to_cancel(exp, hur, &cancels);
2042         ldlm_cli_cancel_list(&cancels, count, NULL, 0);
2043         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
2044
2045         /* Copy hsm_request struct */
2046         req_hr = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_REQUEST);
2047         if (req_hr == NULL)
2048                 GOTO(out, rc = -EPROTO);
2049         *req_hr = hur->hur_request;
2050
2051         /* Copy hsm_user_item structs */
2052         req_hui = req_capsule_client_get(&req->rq_pill, &RMF_MDS_HSM_USER_ITEM);
2053         if (req_hui == NULL)
2054                 GOTO(out, rc = -EPROTO);
2055         memcpy(req_hui, hur->hur_user_item,
2056                hur->hur_request.hr_itemcount * sizeof(struct hsm_user_item));
2057
2058         /* Copy opaque field */
2059         req_opaque = req_capsule_client_get(&req->rq_pill, &RMF_GENERIC_DATA);
2060         if (req_opaque == NULL)
2061                 GOTO(out, rc = -EPROTO);
2062         memcpy(req_opaque, hur_data(hur), hur->hur_request.hr_data_len);
2063
2064         ptlrpc_request_set_replen(req);
2065
2066         ptlrpc_get_mod_rpc_slot(req);
2067         rc = ptlrpc_queue_wait(req);
2068         ptlrpc_put_mod_rpc_slot(req);
2069
2070         GOTO(out, rc);
2071
2072 out:
2073         ptlrpc_req_finished(req);
2074         return rc;
2075 }
2076
2077 static int mdc_ioc_hsm_ct_start(struct obd_export *exp,
2078                                 struct lustre_kernelcomm *lk);
2079
2080 static int mdc_quotactl(struct obd_device *unused, struct obd_export *exp,
2081                         struct obd_quotactl *oqctl)
2082 {
2083         struct ptlrpc_request *req;
2084         struct obd_quotactl *oqc;
2085         int rc;
2086         ENTRY;
2087
2088         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_QUOTACTL);
2089         if (req == NULL)
2090                 RETURN(-ENOMEM);
2091
2092
2093         if (LUSTRE_Q_CMD_IS_POOL(oqctl->qc_cmd))
2094                 req_capsule_set_size(&req->rq_pill,
2095                                      &RMF_OBD_QUOTACTL,
2096                                      RCL_CLIENT,
2097                                      sizeof(*oqc) + LOV_MAXPOOLNAME + 1);
2098
2099         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION,
2100                                  MDS_QUOTACTL);
2101         if (rc) {
2102                 ptlrpc_request_free(req);
2103                 RETURN(rc);
2104         }
2105
2106         oqc = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2107         QCTL_COPY(oqc, oqctl);
2108
2109         ptlrpc_request_set_replen(req);
2110         ptlrpc_at_set_req_timeout(req);
2111
2112         rc = ptlrpc_queue_wait(req);
2113         if (rc) {
2114                 CERROR("%s: ptlrpc_queue_wait failed: rc = %d\n",
2115                        exp->exp_obd->obd_name, rc);
2116                 GOTO(out, rc);
2117         }
2118
2119         if (req->rq_repmsg &&
2120             (oqc = req_capsule_server_get(&req->rq_pill, &RMF_OBD_QUOTACTL))) {
2121                 QCTL_COPY(oqctl, oqc);
2122         } else if (!rc) {
2123                 rc = -EPROTO;
2124                 CERROR("%s: cannot unpack obd_quotactl: rc = %d\n",
2125                         exp->exp_obd->obd_name, rc);
2126         }
2127 out:
2128         ptlrpc_req_finished(req);
2129
2130         RETURN(rc);
2131 }
2132
2133 static int mdc_ioc_swap_layouts(struct obd_export *exp,
2134                                 struct md_op_data *op_data)
2135 {
2136         LIST_HEAD(cancels);
2137         struct ptlrpc_request   *req;
2138         int                      rc, count;
2139         struct mdc_swap_layouts *msl, *payload;
2140         ENTRY;
2141
2142         msl = op_data->op_data;
2143
2144         /* When the MDT will get the MDS_SWAP_LAYOUTS RPC the
2145          * first thing it will do is to cancel the 2 layout
2146          * locks held by this client.
2147          * So the client must cancel its layout locks on the 2 fids
2148          * with the request RPC to avoid extra RPC round trips.
2149          */
2150         count = mdc_resource_get_unused(exp, &op_data->op_fid1, &cancels,
2151                                         LCK_EX, MDS_INODELOCK_LAYOUT |
2152                                         MDS_INODELOCK_XATTR);
2153         count += mdc_resource_get_unused(exp, &op_data->op_fid2, &cancels,
2154                                          LCK_EX, MDS_INODELOCK_LAYOUT |
2155                                          MDS_INODELOCK_XATTR);
2156
2157         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
2158                                    &RQF_MDS_SWAP_LAYOUTS);
2159         if (req == NULL) {
2160                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
2161                 RETURN(-ENOMEM);
2162         }
2163
2164         rc = mdc_prep_elc_req(exp, req, MDS_SWAP_LAYOUTS, &cancels, count);
2165         if (rc) {
2166                 ptlrpc_request_free(req);
2167                 RETURN(rc);
2168         }
2169
2170         mdc_swap_layouts_pack(&req->rq_pill, op_data);
2171
2172         payload = req_capsule_client_get(&req->rq_pill, &RMF_SWAP_LAYOUTS);
2173         LASSERT(payload);
2174
2175         *payload = *msl;
2176
2177         ptlrpc_request_set_replen(req);
2178
2179         rc = ptlrpc_queue_wait(req);
2180         if (rc)
2181                 GOTO(out, rc);
2182         EXIT;
2183
2184 out:
2185         ptlrpc_req_finished(req);
2186         return rc;
2187 }
2188
2189 static int mdc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
2190                          void *karg, void __user *uarg)
2191 {
2192         struct obd_device *obd = exp->exp_obd;
2193         struct obd_ioctl_data *data = karg;
2194         struct obd_import *imp = obd->u.cli.cl_import;
2195         int rc;
2196         ENTRY;
2197
2198         if (!try_module_get(THIS_MODULE)) {
2199                 CERROR("%s: cannot get module '%s'\n", obd->obd_name,
2200                        module_name(THIS_MODULE));
2201                 return -EINVAL;
2202         }
2203         switch (cmd) {
2204         case OBD_IOC_FID2PATH:
2205                 rc = mdc_ioc_fid2path(exp, karg);
2206                 GOTO(out, rc);
2207         case LL_IOC_HSM_CT_START:
2208                 rc = mdc_ioc_hsm_ct_start(exp, karg);
2209                 /* ignore if it was already registered on this MDS. */
2210                 if (rc == -EEXIST)
2211                         rc = 0;
2212                 GOTO(out, rc);
2213         case LL_IOC_HSM_PROGRESS:
2214                 rc = mdc_ioc_hsm_progress(exp, karg);
2215                 GOTO(out, rc);
2216         case LL_IOC_HSM_STATE_GET:
2217                 rc = mdc_ioc_hsm_state_get(exp, karg);
2218                 GOTO(out, rc);
2219         case LL_IOC_HSM_STATE_SET:
2220                 rc = mdc_ioc_hsm_state_set(exp, karg);
2221                 GOTO(out, rc);
2222         case LL_IOC_HSM_ACTION:
2223                 rc = mdc_ioc_hsm_current_action(exp, karg);
2224                 GOTO(out, rc);
2225         case LL_IOC_HSM_REQUEST:
2226                 rc = mdc_ioc_hsm_request(exp, karg);
2227                 GOTO(out, rc);
2228         case OBD_IOC_CLIENT_RECOVER:
2229                 rc = ptlrpc_recover_import(imp, data->ioc_inlbuf1, 0);
2230                 if (rc < 0)
2231                         GOTO(out, rc);
2232                 GOTO(out, rc = 0);
2233         case IOC_OSC_SET_ACTIVE:
2234                 rc = ptlrpc_set_import_active(imp, data->ioc_offset);
2235                 GOTO(out, rc);
2236         /*
2237          * Normally IOC_OBD_STATFS, OBD_IOC_QUOTACTL iocontrol are handled by
2238          * LMV instead of MDC. But when the cluster is upgraded from 1.8,
2239          * there'd be no LMV layer thus we might be called here. Eventually
2240          * this code should be removed.
2241          * bz20731, LU-592.
2242          */
2243         case IOC_OBD_STATFS: {
2244                 struct obd_statfs stat_buf = {0};
2245
2246                 if (*((__u32 *) data->ioc_inlbuf2) != 0)
2247                         GOTO(out, rc = -ENODEV);
2248
2249                 /* copy UUID */
2250                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(obd),
2251                                  min((int)data->ioc_plen2,
2252                                      (int)sizeof(struct obd_uuid))))
2253                         GOTO(out, rc = -EFAULT);
2254
2255                 rc = mdc_statfs(NULL, obd->obd_self_export, &stat_buf,
2256                                 ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
2257                                 0);
2258                 if (rc != 0)
2259                         GOTO(out, rc);
2260
2261                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
2262                                      min((int) data->ioc_plen1,
2263                                          (int) sizeof(stat_buf))))
2264                         GOTO(out, rc = -EFAULT);
2265
2266                 GOTO(out, rc = 0);
2267         }
2268         case OBD_IOC_QUOTACTL: {
2269                 struct if_quotactl *qctl = karg;
2270                 struct obd_quotactl *oqctl;
2271
2272                 OBD_ALLOC_PTR(oqctl);
2273                 if (oqctl == NULL)
2274                         GOTO(out, rc = -ENOMEM);
2275
2276                 QCTL_COPY(oqctl, qctl);
2277                 rc = obd_quotactl(exp, oqctl);
2278                 if (rc == 0) {
2279                         QCTL_COPY(qctl, oqctl);
2280                         qctl->qc_valid = QC_MDTIDX;
2281                         qctl->obd_uuid = obd->u.cli.cl_target_uuid;
2282                 }
2283
2284                 OBD_FREE_PTR(oqctl);
2285                 GOTO(out, rc);
2286         }
2287         case LL_IOC_GET_CONNECT_FLAGS:
2288                 if (copy_to_user(uarg, exp_connect_flags_ptr(exp),
2289                                  sizeof(*exp_connect_flags_ptr(exp))))
2290                         GOTO(out, rc = -EFAULT);
2291
2292                 GOTO(out, rc = 0);
2293         case LL_IOC_LOV_SWAP_LAYOUTS:
2294                 rc = mdc_ioc_swap_layouts(exp, karg);
2295                 GOTO(out, rc);
2296         default:
2297                 CERROR("unrecognised ioctl: cmd = %#x\n", cmd);
2298                 GOTO(out, rc = -ENOTTY);
2299         }
2300 out:
2301         module_put(THIS_MODULE);
2302
2303         return rc;
2304 }
2305
2306 static int mdc_get_info_rpc(struct obd_export *exp,
2307                             u32 keylen, void *key,
2308                             u32 vallen, void *val)
2309 {
2310         struct obd_import      *imp = class_exp2cliimp(exp);
2311         struct ptlrpc_request  *req;
2312         char                   *tmp;
2313         int                     rc = -EINVAL;
2314         ENTRY;
2315
2316         req = ptlrpc_request_alloc(imp, &RQF_MDS_GET_INFO);
2317         if (req == NULL)
2318                 RETURN(-ENOMEM);
2319
2320         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_KEY,
2321                              RCL_CLIENT, keylen);
2322         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_VALLEN,
2323                              RCL_CLIENT, sizeof(vallen));
2324
2325         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_GET_INFO);
2326         if (rc) {
2327                 ptlrpc_request_free(req);
2328                 RETURN(rc);
2329         }
2330
2331         tmp = req_capsule_client_get(&req->rq_pill, &RMF_GETINFO_KEY);
2332         memcpy(tmp, key, keylen);
2333         tmp = req_capsule_client_get(&req->rq_pill, &RMF_GETINFO_VALLEN);
2334         memcpy(tmp, &vallen, sizeof(vallen));
2335
2336         req_capsule_set_size(&req->rq_pill, &RMF_GETINFO_VAL,
2337                              RCL_SERVER, vallen);
2338         ptlrpc_request_set_replen(req);
2339
2340         /* if server failed to resolve FID, and OI scrub not able to fix it, it
2341          * will return -EINPROGRESS, ptlrpc_queue_wait() will keep retrying,
2342          * set request interruptible to avoid deadlock.
2343          */
2344         if (KEY_IS(KEY_FID2PATH))
2345                 req->rq_allow_intr = 1;
2346
2347         rc = ptlrpc_queue_wait(req);
2348         /* -EREMOTE means the get_info result is partial, and it needs to
2349          * continue on another MDT, see fid2path part in lmv_iocontrol */
2350         if (rc == 0 || rc == -EREMOTE) {
2351                 tmp = req_capsule_server_get(&req->rq_pill, &RMF_GETINFO_VAL);
2352                 memcpy(val, tmp, vallen);
2353                 if (req_capsule_rep_need_swab(&req->rq_pill)) {
2354                         if (KEY_IS(KEY_FID2PATH))
2355                                 lustre_swab_fid2path(val);
2356                 }
2357         }
2358         ptlrpc_req_finished(req);
2359
2360         RETURN(rc);
2361 }
2362
2363 static void lustre_swab_hai(struct hsm_action_item *h)
2364 {
2365         __swab32s(&h->hai_len);
2366         __swab32s(&h->hai_action);
2367         lustre_swab_lu_fid(&h->hai_fid);
2368         lustre_swab_lu_fid(&h->hai_dfid);
2369         __swab64s(&h->hai_cookie);
2370         __swab64s(&h->hai_extent.offset);
2371         __swab64s(&h->hai_extent.length);
2372         __swab64s(&h->hai_gid);
2373 }
2374
2375 static void lustre_swab_hal(struct hsm_action_list *h)
2376 {
2377         struct hsm_action_item  *hai;
2378         __u32                    i;
2379
2380         __swab32s(&h->hal_version);
2381         __swab32s(&h->hal_count);
2382         __swab32s(&h->hal_archive_id);
2383         __swab64s(&h->hal_flags);
2384         hai = hai_first(h);
2385         for (i = 0; i < h->hal_count; i++, hai = hai_next(hai))
2386                 lustre_swab_hai(hai);
2387 }
2388
2389 static void lustre_swab_kuch(struct kuc_hdr *l)
2390 {
2391         __swab16s(&l->kuc_magic);
2392         /* __u8 l->kuc_transport */
2393         __swab16s(&l->kuc_msgtype);
2394         __swab16s(&l->kuc_msglen);
2395 }
2396
2397 static int mdc_ioc_hsm_ct_start(struct obd_export *exp,
2398                                 struct lustre_kernelcomm *lk)
2399 {
2400         struct obd_import *imp = class_exp2cliimp(exp);
2401         int rc = 0;
2402
2403         if (lk->lk_group != KUC_GRP_HSM) {
2404                 CERROR("Bad copytool group %d\n", lk->lk_group);
2405                 return -EINVAL;
2406         }
2407
2408         CDEBUG(D_HSM, "CT start r%d w%d u%d g%d f%#x\n", lk->lk_rfd, lk->lk_wfd,
2409                lk->lk_uid, lk->lk_group, lk->lk_flags);
2410
2411         if (lk->lk_flags & LK_FLG_STOP) {
2412                 /* Unregister with the coordinator */
2413                 rc = mdc_ioc_hsm_ct_unregister(imp);
2414         } else {
2415                 __u32 *archives = NULL;
2416
2417                 if ((lk->lk_flags & LK_FLG_DATANR) && lk->lk_data_count > 0)
2418                         archives = lk->lk_data;
2419
2420                 rc = mdc_ioc_hsm_ct_register(imp, lk->lk_data_count, archives);
2421         }
2422
2423         return rc;
2424 }
2425
2426 /**
2427  * Send a message to any listening copytools
2428  * @param val KUC message (kuc_hdr + hsm_action_list)
2429  * @param len total length of message
2430  */
2431 static int mdc_hsm_copytool_send(const struct obd_uuid *uuid,
2432                                  size_t len, void *val)
2433 {
2434         struct kuc_hdr          *lh = (struct kuc_hdr *)val;
2435         struct hsm_action_list  *hal = (struct hsm_action_list *)(lh + 1);
2436         int                      rc;
2437         ENTRY;
2438
2439         if (len < sizeof(*lh) + sizeof(*hal)) {
2440                 CERROR("Short HSM message %zu < %zu\n", len,
2441                        sizeof(*lh) + sizeof(*hal));
2442                 RETURN(-EPROTO);
2443         }
2444         if (lh->kuc_magic == __swab16(KUC_MAGIC)) {
2445                 lustre_swab_kuch(lh);
2446                 lustre_swab_hal(hal);
2447         } else if (lh->kuc_magic != KUC_MAGIC) {
2448                 CERROR("Bad magic %x!=%x\n", lh->kuc_magic, KUC_MAGIC);
2449                 RETURN(-EPROTO);
2450         }
2451
2452         CDEBUG(D_HSM, " Received message mg=%x t=%d m=%d l=%d actions=%d "
2453                "on %s\n",
2454                lh->kuc_magic, lh->kuc_transport, lh->kuc_msgtype,
2455                lh->kuc_msglen, hal->hal_count, hal->hal_fsname);
2456
2457         /* Broadcast to HSM listeners */
2458         rc = libcfs_kkuc_group_put(uuid, KUC_GRP_HSM, lh);
2459
2460         RETURN(rc);
2461 }
2462
2463 /**
2464  * callback function passed to kuc for re-registering each HSM copytool
2465  * running on MDC, after MDT shutdown/recovery.
2466  * @param data copytool registration data
2467  * @param cb_arg callback argument (obd_import)
2468  */
2469 static int mdc_hsm_ct_reregister(void *data, void *cb_arg)
2470 {
2471         struct obd_import *imp = (struct obd_import *)cb_arg;
2472         struct kkuc_ct_data *kcd = data;
2473         __u32 *archives = NULL;
2474         int rc;
2475
2476         if (kcd == NULL ||
2477             (kcd->kcd_magic != KKUC_CT_DATA_ARRAY_MAGIC &&
2478              kcd->kcd_magic != KKUC_CT_DATA_BITMAP_MAGIC))
2479                 return -EPROTO;
2480
2481         if (kcd->kcd_magic == KKUC_CT_DATA_BITMAP_MAGIC) {
2482                 CDEBUG(D_HA, "%s: recover copytool registration to MDT "
2483                        "(archive=%#x)\n", imp->imp_obd->obd_name,
2484                        kcd->kcd_nr_archives);
2485         } else {
2486                 CDEBUG(D_HA, "%s: recover copytool registration to MDT "
2487                        "(archive nr = %u)\n",
2488                        imp->imp_obd->obd_name, kcd->kcd_nr_archives);
2489                 if (kcd->kcd_nr_archives != 0)
2490                         archives = kcd->kcd_archives;
2491         }
2492
2493         rc = mdc_ioc_hsm_ct_register(imp, kcd->kcd_nr_archives, archives);
2494         /* ignore error if the copytool is already registered */
2495         return (rc == -EEXIST) ? 0 : rc;
2496 }
2497
2498 /**
2499  * Re-establish all kuc contexts with MDT
2500  * after MDT shutdown/recovery.
2501  */
2502 static int mdc_kuc_reregister(struct obd_import *imp)
2503 {
2504         /* re-register HSM agents */
2505         return libcfs_kkuc_group_foreach(&imp->imp_obd->obd_uuid, KUC_GRP_HSM,
2506                                          mdc_hsm_ct_reregister, imp);
2507 }
2508
2509 static int mdc_set_info_async(const struct lu_env *env,
2510                               struct obd_export *exp,
2511                               u32 keylen, void *key,
2512                               u32 vallen, void *val,
2513                               struct ptlrpc_request_set *set)
2514 {
2515         struct obd_import       *imp = class_exp2cliimp(exp);
2516         int                      rc;
2517         ENTRY;
2518
2519         if (KEY_IS(KEY_READ_ONLY)) {
2520                 if (vallen != sizeof(int))
2521                         RETURN(-EINVAL);
2522
2523                 spin_lock(&imp->imp_lock);
2524                 if (*((int *)val)) {
2525                         imp->imp_connect_flags_orig |= OBD_CONNECT_RDONLY;
2526                         imp->imp_connect_data.ocd_connect_flags |=
2527                                                         OBD_CONNECT_RDONLY;
2528                 } else {
2529                         imp->imp_connect_flags_orig &= ~OBD_CONNECT_RDONLY;
2530                         imp->imp_connect_data.ocd_connect_flags &=
2531                                                         ~OBD_CONNECT_RDONLY;
2532                 }
2533                 spin_unlock(&imp->imp_lock);
2534
2535                 rc = do_set_info_async(imp, MDS_SET_INFO, LUSTRE_MDS_VERSION,
2536                                        keylen, key, vallen, val, set);
2537                 RETURN(rc);
2538         }
2539         if (KEY_IS(KEY_CHANGELOG_CLEAR)) {
2540                 rc = do_set_info_async(imp, MDS_SET_INFO, LUSTRE_MDS_VERSION,
2541                                        keylen, key, vallen, val, set);
2542                 RETURN(rc);
2543         }
2544         if (KEY_IS(KEY_HSM_COPYTOOL_SEND)) {
2545                 rc = mdc_hsm_copytool_send(&imp->imp_obd->obd_uuid, vallen,
2546                                            val);
2547                 RETURN(rc);
2548         }
2549
2550         if (KEY_IS(KEY_DEFAULT_EASIZE)) {
2551                 __u32 *default_easize = val;
2552
2553                 exp->exp_obd->u.cli.cl_default_mds_easize = *default_easize;
2554                 RETURN(0);
2555         }
2556
2557         rc = osc_set_info_async(env, exp, keylen, key, vallen, val, set);
2558         RETURN(rc);
2559 }
2560
2561 static int mdc_get_info(const struct lu_env *env, struct obd_export *exp,
2562                         __u32 keylen, void *key, __u32 *vallen, void *val)
2563 {
2564         int rc = -EINVAL;
2565
2566         if (KEY_IS(KEY_MAX_EASIZE)) {
2567                 __u32 mdsize, *max_easize;
2568
2569                 if (*vallen != sizeof(int))
2570                         RETURN(-EINVAL);
2571                 mdsize = *(__u32 *)val;
2572                 if (mdsize > exp->exp_obd->u.cli.cl_max_mds_easize)
2573                         exp->exp_obd->u.cli.cl_max_mds_easize = mdsize;
2574                 max_easize = val;
2575                 *max_easize = exp->exp_obd->u.cli.cl_max_mds_easize;
2576                 RETURN(0);
2577         } else if (KEY_IS(KEY_DEFAULT_EASIZE)) {
2578                 __u32 *default_easize;
2579
2580                 if (*vallen != sizeof(int))
2581                         RETURN(-EINVAL);
2582                 default_easize = val;
2583                 *default_easize = exp->exp_obd->u.cli.cl_default_mds_easize;
2584                 RETURN(0);
2585         } else if (KEY_IS(KEY_CONN_DATA)) {
2586                 struct obd_import *imp = class_exp2cliimp(exp);
2587                 struct obd_connect_data *data = val;
2588
2589                 if (*vallen != sizeof(*data))
2590                         RETURN(-EINVAL);
2591
2592                 *data = imp->imp_connect_data;
2593                 RETURN(0);
2594         } else if (KEY_IS(KEY_TGT_COUNT)) {
2595                 *((__u32 *)val) = 1;
2596                 RETURN(0);
2597         }
2598
2599         rc = mdc_get_info_rpc(exp, keylen, key, *vallen, val);
2600
2601         RETURN(rc);
2602 }
2603
2604 static int mdc_fsync(struct obd_export *exp, const struct lu_fid *fid,
2605                      struct ptlrpc_request **request)
2606 {
2607         struct ptlrpc_request *req;
2608         int                    rc;
2609         ENTRY;
2610
2611         *request = NULL;
2612         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_SYNC);
2613         if (req == NULL)
2614                 RETURN(-ENOMEM);
2615
2616         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_SYNC);
2617         if (rc) {
2618                 ptlrpc_request_free(req);
2619                 RETURN(rc);
2620         }
2621
2622         mdc_pack_body(&req->rq_pill, fid, 0, 0, -1, 0);
2623
2624         ptlrpc_request_set_replen(req);
2625
2626         rc = ptlrpc_queue_wait(req);
2627         if (rc)
2628                 ptlrpc_req_finished(req);
2629         else
2630                 *request = req;
2631         RETURN(rc);
2632 }
2633
2634 struct mdc_rmfid_args {
2635         int *mra_rcs;
2636         int mra_nr;
2637 };
2638
2639 int mdc_rmfid_interpret(const struct lu_env *env, struct ptlrpc_request *req,
2640                           void *args, int rc)
2641 {
2642         struct mdc_rmfid_args *aa;
2643         int *rcs, size;
2644         ENTRY;
2645
2646         if (!rc) {
2647                 aa = ptlrpc_req_async_args(aa, req);
2648
2649                 size = req_capsule_get_size(&req->rq_pill, &RMF_RCS,
2650                                             RCL_SERVER);
2651                 LASSERT(size == sizeof(int) * aa->mra_nr);
2652                 rcs = req_capsule_server_get(&req->rq_pill, &RMF_RCS);
2653                 LASSERT(rcs);
2654                 LASSERT(aa->mra_rcs);
2655                 LASSERT(aa->mra_nr);
2656                 memcpy(aa->mra_rcs, rcs, size);
2657         }
2658
2659         RETURN(rc);
2660 }
2661
2662 static int mdc_rmfid(struct obd_export *exp, struct fid_array *fa,
2663                      int *rcs, struct ptlrpc_request_set *set)
2664 {
2665         struct ptlrpc_request *req;
2666         struct mdc_rmfid_args *aa;
2667         struct mdt_body *b;
2668         struct lu_fid *tmp;
2669         int rc, flen;
2670         ENTRY;
2671
2672         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_RMFID);
2673         if (req == NULL)
2674                 RETURN(-ENOMEM);
2675
2676         flen = fa->fa_nr * sizeof(struct lu_fid);
2677         req_capsule_set_size(&req->rq_pill, &RMF_FID_ARRAY,
2678                              RCL_CLIENT, flen);
2679         req_capsule_set_size(&req->rq_pill, &RMF_FID_ARRAY,
2680                              RCL_SERVER, flen);
2681         req_capsule_set_size(&req->rq_pill, &RMF_RCS,
2682                              RCL_SERVER, fa->fa_nr * sizeof(__u32));
2683         rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_RMFID);
2684         if (rc) {
2685                 ptlrpc_request_free(req);
2686                 RETURN(rc);
2687         }
2688         tmp = req_capsule_client_get(&req->rq_pill, &RMF_FID_ARRAY);
2689         memcpy(tmp, fa->fa_fids, flen);
2690
2691         mdc_pack_body(&req->rq_pill, NULL, 0, 0, -1, 0);
2692         b = req_capsule_client_get(&req->rq_pill, &RMF_MDT_BODY);
2693         b->mbo_ctime = ktime_get_real_seconds();
2694
2695         ptlrpc_request_set_replen(req);
2696
2697         LASSERT(rcs);
2698         aa = ptlrpc_req_async_args(aa, req);
2699         aa->mra_rcs = rcs;
2700         aa->mra_nr = fa->fa_nr;
2701         req->rq_interpret_reply = mdc_rmfid_interpret;
2702
2703         ptlrpc_set_add_req(set, req);
2704         ptlrpc_check_set(NULL, set);
2705
2706         RETURN(rc);
2707 }
2708
2709 static int mdc_import_event(struct obd_device *obd, struct obd_import *imp,
2710                             enum obd_import_event event)
2711 {
2712         struct client_obd *cli = &obd->u.cli;
2713         int rc = 0;
2714
2715         LASSERT(imp->imp_obd == obd);
2716
2717         switch (event) {
2718         case IMP_EVENT_DISCON:
2719                 spin_lock(&cli->cl_loi_list_lock);
2720                 cli->cl_avail_grant = 0;
2721                 cli->cl_lost_grant = 0;
2722                 spin_unlock(&cli->cl_loi_list_lock);
2723                 break;
2724         case IMP_EVENT_INACTIVE:
2725                 /*
2726                  * Flush current sequence to make client obtain new one
2727                  * from server in case of disconnect/reconnect.
2728                  */
2729                 down_read(&cli->cl_seq_rwsem);
2730                 if (cli->cl_seq)
2731                         seq_client_flush(cli->cl_seq);
2732                 up_read(&cli->cl_seq_rwsem);
2733
2734                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_INACTIVE);
2735                 break;
2736         case IMP_EVENT_INVALIDATE: {
2737                 struct ldlm_namespace *ns = obd->obd_namespace;
2738                 struct lu_env *env;
2739                 __u16 refcheck;
2740
2741                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
2742
2743                 env = cl_env_get(&refcheck);
2744                 if (!IS_ERR(env)) {
2745                         /* Reset grants. All pages go to failing rpcs due to
2746                          * the invalid import.
2747                          */
2748                         osc_io_unplug(env, cli, NULL);
2749
2750                         cfs_hash_for_each_nolock(ns->ns_rs_hash,
2751                                                  osc_ldlm_resource_invalidate,
2752                                                  env, 0);
2753                         cl_env_put(env, &refcheck);
2754                         ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
2755                 } else {
2756                         rc = PTR_ERR(env);
2757                 }
2758                 break;
2759         }
2760         case IMP_EVENT_ACTIVE:
2761                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_ACTIVE);
2762                 /* redo the kuc registration after reconnecting */
2763                 if (rc == 0)
2764                         rc = mdc_kuc_reregister(imp);
2765                 break;
2766         case IMP_EVENT_OCD: {
2767                 struct obd_connect_data *ocd = &imp->imp_connect_data;
2768
2769                 if (OCD_HAS_FLAG(ocd, GRANT))
2770                         osc_init_grant(cli, ocd);
2771
2772                 md_init_ea_size(obd->obd_self_export, ocd->ocd_max_easize, 0);
2773                 rc = obd_notify_observer(obd, obd, OBD_NOTIFY_OCD);
2774                 break;
2775         }
2776         case IMP_EVENT_DEACTIVATE:
2777         case IMP_EVENT_ACTIVATE:
2778                 break;
2779         default:
2780                 CERROR("Unknown import event %x\n", event);
2781                 LBUG();
2782         }
2783         RETURN(rc);
2784 }
2785
2786 int mdc_fid_alloc(const struct lu_env *env, struct obd_export *exp,
2787                   struct lu_fid *fid, struct md_op_data *op_data)
2788 {
2789         struct client_obd *cli = &exp->exp_obd->u.cli;
2790         int rc = -EIO;
2791
2792         ENTRY;
2793
2794         down_read(&cli->cl_seq_rwsem);
2795         if (cli->cl_seq)
2796                 rc = seq_client_alloc_fid(env, cli->cl_seq, fid);
2797         up_read(&cli->cl_seq_rwsem);
2798
2799         RETURN(rc);
2800 }
2801
2802 static struct obd_uuid *mdc_get_uuid(struct obd_export *exp)
2803 {
2804         struct client_obd *cli = &exp->exp_obd->u.cli;
2805         return &cli->cl_target_uuid;
2806 }
2807
2808 /**
2809  * Determine whether the lock can be canceled before replaying it during
2810  * recovery, non zero value will be return if the lock can be canceled,
2811  * or zero returned for not
2812  */
2813 static int mdc_cancel_weight(struct ldlm_lock *lock)
2814 {
2815         if (lock->l_resource->lr_type != LDLM_IBITS)
2816                 RETURN(0);
2817
2818         /* FIXME: if we ever get into a situation where there are too many
2819          * opened files with open locks on a single node, then we really
2820          * should replay these open locks to reget it */
2821         if (lock->l_policy_data.l_inodebits.bits & MDS_INODELOCK_OPEN)
2822                 RETURN(0);
2823
2824         /* Special case for DoM locks, cancel only unused and granted locks */
2825         if (ldlm_has_dom(lock) &&
2826             (lock->l_granted_mode != lock->l_req_mode ||
2827              osc_ldlm_weigh_ast(lock) != 0))
2828                 RETURN(0);
2829
2830         RETURN(1);
2831 }
2832
2833 static int mdc_resource_inode_free(struct ldlm_resource *res)
2834 {
2835         if (res->lr_lvb_inode)
2836                 res->lr_lvb_inode = NULL;
2837
2838         return 0;
2839 }
2840
2841 static struct ldlm_valblock_ops inode_lvbo = {
2842         .lvbo_free = mdc_resource_inode_free
2843 };
2844
2845 static int mdc_llog_init(struct obd_device *obd)
2846 {
2847         struct obd_llog_group   *olg = &obd->obd_olg;
2848         struct llog_ctxt        *ctxt;
2849         int                      rc;
2850
2851         ENTRY;
2852
2853         rc = llog_setup(NULL, obd, olg, LLOG_CHANGELOG_REPL_CTXT, obd,
2854                         &llog_client_ops);
2855         if (rc < 0)
2856                 RETURN(rc);
2857
2858         ctxt = llog_group_get_ctxt(olg, LLOG_CHANGELOG_REPL_CTXT);
2859         llog_initiator_connect(ctxt);
2860         llog_ctxt_put(ctxt);
2861
2862         RETURN(0);
2863 }
2864
2865 static void mdc_llog_finish(struct obd_device *obd)
2866 {
2867         struct llog_ctxt *ctxt;
2868
2869         ENTRY;
2870
2871         ctxt = llog_get_context(obd, LLOG_CHANGELOG_REPL_CTXT);
2872         if (ctxt != NULL)
2873                 llog_cleanup(NULL, ctxt);
2874
2875         EXIT;
2876 }
2877
2878 int mdc_setup(struct obd_device *obd, struct lustre_cfg *cfg)
2879 {
2880         int rc;
2881
2882         ENTRY;
2883
2884         rc = osc_setup_common(obd, cfg);
2885         if (rc < 0)
2886                 RETURN(rc);
2887
2888         rc = mdc_tunables_init(obd);
2889         if (rc)
2890                 GOTO(err_osc_cleanup, rc);
2891
2892         obd->u.cli.cl_dom_min_inline_repsize = MDC_DOM_DEF_INLINE_REPSIZE;
2893         obd->u.cli.cl_lsom_update = true;
2894
2895         ns_register_cancel(obd->obd_namespace, mdc_cancel_weight);
2896
2897         obd->obd_namespace->ns_lvbo = &inode_lvbo;
2898
2899         rc = mdc_llog_init(obd);
2900         if (rc) {
2901                 CERROR("%s: failed to setup llogging subsystems: rc = %d\n",
2902                        obd->obd_name, rc);
2903                 GOTO(err_llog_cleanup, rc);
2904         }
2905
2906         rc = mdc_changelog_cdev_init(obd);
2907         if (rc) {
2908                 CERROR("%s: failed to setup changelog char device: rc = %d\n",
2909                        obd->obd_name, rc);
2910                 GOTO(err_changelog_cleanup, rc);
2911         }
2912
2913         RETURN(rc);
2914
2915 err_changelog_cleanup:
2916         mdc_llog_finish(obd);
2917 err_llog_cleanup:
2918         lprocfs_free_md_stats(obd);
2919         ptlrpc_lprocfs_unregister_obd(obd);
2920 err_osc_cleanup:
2921         osc_cleanup_common(obd);
2922         return rc;
2923 }
2924
2925 /* Initialize the default and maximum LOV EA sizes.  This allows
2926  * us to make MDS RPCs with large enough reply buffers to hold a default
2927  * sized EA without having to calculate this (via a call into the
2928  * LOV + OSCs) each time we make an RPC.  The maximum size is also tracked
2929  * but not used to avoid wastefully vmalloc()'ing large reply buffers when
2930  * a large number of stripes is possible.  If a larger reply buffer is
2931  * required it will be reallocated in the ptlrpc layer due to overflow.
2932  */
2933 static int mdc_init_ea_size(struct obd_export *exp, __u32 easize,
2934                             __u32 def_easize)
2935 {
2936         struct obd_device *obd = exp->exp_obd;
2937         struct client_obd *cli = &obd->u.cli;
2938         ENTRY;
2939
2940         if (cli->cl_max_mds_easize < easize)
2941                 cli->cl_max_mds_easize = easize;
2942
2943         if (cli->cl_default_mds_easize < def_easize)
2944                 cli->cl_default_mds_easize = def_easize;
2945
2946         RETURN(0);
2947 }
2948
2949 static int mdc_precleanup(struct obd_device *obd)
2950 {
2951         ENTRY;
2952
2953         osc_precleanup_common(obd);
2954         mdc_changelog_cdev_finish(obd);
2955
2956         obd_cleanup_client_import(obd);
2957         ptlrpc_lprocfs_unregister_obd(obd);
2958         lprocfs_free_md_stats(obd);
2959         mdc_llog_finish(obd);
2960         RETURN(0);
2961 }
2962
2963 static int mdc_cleanup(struct obd_device *obd)
2964 {
2965         return osc_cleanup_common(obd);
2966 }
2967
2968 static const struct obd_ops mdc_obd_ops = {
2969         .o_owner            = THIS_MODULE,
2970         .o_setup            = mdc_setup,
2971         .o_precleanup       = mdc_precleanup,
2972         .o_cleanup          = mdc_cleanup,
2973         .o_add_conn         = client_import_add_conn,
2974         .o_del_conn         = client_import_del_conn,
2975         .o_connect          = client_connect_import,
2976         .o_reconnect        = osc_reconnect,
2977         .o_disconnect       = osc_disconnect,
2978         .o_iocontrol        = mdc_iocontrol,
2979         .o_set_info_async   = mdc_set_info_async,
2980         .o_statfs           = mdc_statfs,
2981         .o_statfs_async     = mdc_statfs_async,
2982         .o_fid_init         = client_fid_init,
2983         .o_fid_fini         = client_fid_fini,
2984         .o_fid_alloc        = mdc_fid_alloc,
2985         .o_import_event     = mdc_import_event,
2986         .o_get_info         = mdc_get_info,
2987         .o_get_uuid         = mdc_get_uuid,
2988         .o_quotactl         = mdc_quotactl,
2989 };
2990
2991 static const struct md_ops mdc_md_ops = {
2992         .m_get_root         = mdc_get_root,
2993         .m_null_inode       = mdc_null_inode,
2994         .m_close            = mdc_close,
2995         .m_create           = mdc_create,
2996         .m_enqueue          = mdc_enqueue,
2997         .m_getattr          = mdc_getattr,
2998         .m_getattr_name     = mdc_getattr_name,
2999         .m_intent_lock      = mdc_intent_lock,
3000         .m_link             = mdc_link,
3001         .m_rename           = mdc_rename,
3002         .m_setattr          = mdc_setattr,
3003         .m_setxattr         = mdc_setxattr,
3004         .m_getxattr         = mdc_getxattr,
3005         .m_fsync                = mdc_fsync,
3006         .m_file_resync          = mdc_file_resync,
3007         .m_read_page            = mdc_read_page,
3008         .m_unlink           = mdc_unlink,
3009         .m_cancel_unused    = mdc_cancel_unused,
3010         .m_init_ea_size     = mdc_init_ea_size,
3011         .m_set_lock_data    = mdc_set_lock_data,
3012         .m_lock_match       = mdc_lock_match,
3013         .m_get_lustre_md    = mdc_get_lustre_md,
3014         .m_free_lustre_md   = mdc_free_lustre_md,
3015         .m_set_open_replay_data = mdc_set_open_replay_data,
3016         .m_clear_open_replay_data = mdc_clear_open_replay_data,
3017         .m_intent_getattr_async = mdc_intent_getattr_async,
3018         .m_revalidate_lock      = mdc_revalidate_lock,
3019         .m_rmfid                = mdc_rmfid,
3020 };
3021
3022 dev_t mdc_changelog_dev;
3023 struct class *mdc_changelog_class;
3024 static int __init mdc_init(void)
3025 {
3026         int rc = 0;
3027         rc = alloc_chrdev_region(&mdc_changelog_dev, 0,
3028                                  MDC_CHANGELOG_DEV_COUNT,
3029                                  MDC_CHANGELOG_DEV_NAME);
3030         if (rc)
3031                 return rc;
3032
3033         mdc_changelog_class = class_create(THIS_MODULE, MDC_CHANGELOG_DEV_NAME);
3034         if (IS_ERR(mdc_changelog_class)) {
3035                 rc = PTR_ERR(mdc_changelog_class);
3036                 goto out_dev;
3037         }
3038
3039         rc = class_register_type(&mdc_obd_ops, &mdc_md_ops, true,
3040                                  LUSTRE_MDC_NAME, &mdc_device_type);
3041         if (rc)
3042                 goto out_class;
3043
3044         return 0;
3045
3046 out_class:
3047         class_destroy(mdc_changelog_class);
3048 out_dev:
3049         unregister_chrdev_region(mdc_changelog_dev, MDC_CHANGELOG_DEV_COUNT);
3050         return rc;
3051 }
3052
3053 static void __exit mdc_exit(void)
3054 {
3055         class_unregister_type(LUSTRE_MDC_NAME);
3056         class_destroy(mdc_changelog_class);
3057         unregister_chrdev_region(mdc_changelog_dev, MDC_CHANGELOG_DEV_COUNT);
3058         idr_destroy(&mdc_changelog_minor_idr);
3059 }
3060
3061 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
3062 MODULE_DESCRIPTION("Lustre Metadata Client");
3063 MODULE_VERSION(LUSTRE_VERSION_STRING);
3064 MODULE_LICENSE("GPL");
3065
3066 module_init(mdc_init);
3067 module_exit(mdc_exit);