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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) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
24  * Use is subject to license terms.
25  *
26  * Copyright (c) 2012, 2017, Intel Corporation.
27  */
28 /*
29  * This file is part of Lustre, http://www.lustre.org/
30  * Lustre is a trademark of Sun Microsystems, Inc.
31  */
32
33 #define DEBUG_SUBSYSTEM S_MDC
34
35 #include <linux/module.h>
36 #include <linux/kernel.h>
37
38 #include <obd_class.h>
39 #include "mdc_internal.h"
40 #include <lustre_fid.h>
41
42 /* mdc_setattr does its own semaphore handling */
43 static int mdc_reint(struct ptlrpc_request *request, int level)
44 {
45         int rc;
46
47         request->rq_send_state = level;
48
49         mdc_get_mod_rpc_slot(request, NULL);
50         rc = ptlrpc_queue_wait(request);
51         mdc_put_mod_rpc_slot(request, NULL);
52         if (rc)
53                 CDEBUG(D_INFO, "error in handling %d\n", rc);
54         else if (!req_capsule_server_get(&request->rq_pill, &RMF_MDT_BODY)) {
55                 rc = -EPROTO;
56         }
57         return rc;
58 }
59
60 /* Find and cancel locally locks matched by inode @bits & @mode in the resource
61  * found by @fid. Found locks are added into @cancel list. Returns the amount of
62  * locks added to @cancels list. */
63 int mdc_resource_get_unused(struct obd_export *exp, const struct lu_fid *fid,
64                             struct list_head *cancels, enum ldlm_mode mode,
65                             __u64 bits)
66 {
67         struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
68         union ldlm_policy_data policy = { {0} };
69         struct ldlm_res_id res_id;
70         struct ldlm_resource *res;
71         int count;
72         ENTRY;
73
74         /* Return, i.e. cancel nothing, only if ELC is supported (flag in
75          * export) but disabled through procfs (flag in NS).
76          *
77          * This distinguishes from a case when ELC is not supported originally,
78          * when we still want to cancel locks in advance and just cancel them
79          * locally, without sending any RPC. */
80         if (exp_connect_cancelset(exp) && !ns_connect_cancelset(ns))
81                 RETURN(0);
82
83         fid_build_reg_res_name(fid, &res_id);
84         res = ldlm_resource_get(exp->exp_obd->obd_namespace,
85                                 NULL, &res_id, 0, 0);
86         if (IS_ERR(res))
87                 RETURN(0);
88         LDLM_RESOURCE_ADDREF(res);
89         /* Initialize ibits lock policy. */
90         policy.l_inodebits.bits = bits;
91         count = ldlm_cancel_resource_local(res, cancels, &policy,
92                                            mode, 0, 0, NULL);
93         LDLM_RESOURCE_DELREF(res);
94         ldlm_resource_putref(res);
95         RETURN(count);
96 }
97
98 int mdc_setattr(struct obd_export *exp, struct md_op_data *op_data,
99                 void *ea, size_t ealen, struct ptlrpc_request **request)
100 {
101         struct list_head cancels = LIST_HEAD_INIT(cancels);
102         struct ptlrpc_request *req;
103         int count = 0, rc;
104         __u64 bits;
105         ENTRY;
106
107         LASSERT(op_data != NULL);
108
109         bits = MDS_INODELOCK_UPDATE;
110         if (op_data->op_attr.ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID))
111                 bits |= MDS_INODELOCK_LOOKUP;
112         if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
113             (fid_is_sane(&op_data->op_fid1)))
114                 count = mdc_resource_get_unused(exp, &op_data->op_fid1,
115                                                 &cancels, LCK_EX, bits);
116         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
117                                    &RQF_MDS_REINT_SETATTR);
118         if (req == NULL) {
119                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
120                 RETURN(-ENOMEM);
121         }
122
123         req_capsule_set_size(&req->rq_pill, &RMF_MDT_EPOCH, RCL_CLIENT, 0);
124         req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT, ealen);
125         req_capsule_set_size(&req->rq_pill, &RMF_LOGCOOKIES, RCL_CLIENT, 0);
126
127         rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
128         if (rc) {
129                 ptlrpc_request_free(req);
130                 RETURN(rc);
131         }
132
133         if (op_data->op_attr.ia_valid & (ATTR_MTIME | ATTR_CTIME))
134                 CDEBUG(D_INODE, "setting mtime %ld, ctime %ld\n",
135                        LTIME_S(op_data->op_attr.ia_mtime),
136                        LTIME_S(op_data->op_attr.ia_ctime));
137         mdc_setattr_pack(req, op_data, ea, ealen);
138
139         req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER,
140                              req->rq_import->imp_connect_data.ocd_max_easize);
141         ptlrpc_request_set_replen(req);
142
143         rc = mdc_reint(req, LUSTRE_IMP_FULL);
144         if (rc == -ERESTARTSYS)
145                 rc = 0;
146
147         *request = req;
148
149         RETURN(rc);
150 }
151
152 int mdc_create(struct obd_export *exp, struct md_op_data *op_data,
153                 const void *data, size_t datalen,
154                 umode_t mode, uid_t uid, gid_t gid,
155                 cfs_cap_t cap_effective, __u64 rdev,
156                 struct ptlrpc_request **request)
157 {
158         struct ptlrpc_request *req;
159         int level, rc;
160         int count, resends = 0;
161         struct obd_import *import = exp->exp_obd->u.cli.cl_import;
162         int generation = import->imp_generation;
163         struct list_head cancels = LIST_HEAD_INIT(cancels);
164         ENTRY;
165
166         /* For case if upper layer did not alloc fid, do it now. */
167         if (!fid_is_sane(&op_data->op_fid2)) {
168                 /*
169                  * mdc_fid_alloc() may return errno 1 in case of switch to new
170                  * sequence, handle this.
171                  */
172                 rc = mdc_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
173                 if (rc < 0)
174                         RETURN(rc);
175         }
176
177 rebuild:
178         count = 0;
179         if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
180             (fid_is_sane(&op_data->op_fid1)))
181                 count = mdc_resource_get_unused(exp, &op_data->op_fid1,
182                                                 &cancels, LCK_EX,
183                                                 MDS_INODELOCK_UPDATE);
184
185         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
186                                    &RQF_MDS_REINT_CREATE_ACL);
187         if (req == NULL) {
188                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
189                 RETURN(-ENOMEM);
190         }
191
192         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
193                              op_data->op_namelen + 1);
194         req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT,
195                              data && datalen ? datalen : 0);
196
197         req_capsule_set_size(&req->rq_pill, &RMF_FILE_SECCTX_NAME,
198                              RCL_CLIENT, op_data->op_file_secctx_name != NULL ?
199                              strlen(op_data->op_file_secctx_name) + 1 : 0);
200
201         req_capsule_set_size(&req->rq_pill, &RMF_FILE_SECCTX, RCL_CLIENT,
202                              op_data->op_file_secctx_size);
203
204         rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
205         if (rc) {
206                 ptlrpc_request_free(req);
207                 RETURN(rc);
208         }
209
210         /*
211          * mdc_create_pack() fills msg->bufs[1] with name and msg->bufs[2] with
212          * tgt, for symlinks or lov MD data.
213          */
214         mdc_create_pack(req, op_data, data, datalen, mode, uid,
215                         gid, cap_effective, rdev);
216
217         ptlrpc_request_set_replen(req);
218
219         /* ask ptlrpc not to resend on EINPROGRESS since we have our own retry
220          * logic here */
221         req->rq_no_retry_einprogress = 1;
222
223         if (resends) {
224                 req->rq_generation_set = 1;
225                 req->rq_import_generation = generation;
226                 req->rq_sent = ktime_get_real_seconds() + resends;
227         }
228         level = LUSTRE_IMP_FULL;
229  resend:
230         rc = mdc_reint(req, level);
231
232         /* Resend if we were told to. */
233         if (rc == -ERESTARTSYS) {
234                 level = LUSTRE_IMP_RECOVER;
235                 goto resend;
236         } else if (rc == -EINPROGRESS) {
237                 /* Retry create infinitely until succeed or get other
238                  * error code or interrupted. */
239                 ptlrpc_req_finished(req);
240                 if (generation == import->imp_generation) {
241                         if (signal_pending(current))
242                                 RETURN(-EINTR);
243
244                         resends++;
245                         CDEBUG(D_HA, "%s: resend:%d create on "DFID"/"DFID"\n",
246                                exp->exp_obd->obd_name, resends,
247                                PFID(&op_data->op_fid1),
248                                PFID(&op_data->op_fid2));
249                         goto rebuild;
250                 } else {
251                         CDEBUG(D_HA, "resend cross eviction\n");
252                         RETURN(-EIO);
253                 }
254         }
255
256         *request = req;
257         RETURN(rc);
258 }
259
260 int mdc_unlink(struct obd_export *exp, struct md_op_data *op_data,
261                struct ptlrpc_request **request)
262 {
263         struct list_head cancels = LIST_HEAD_INIT(cancels);
264         struct obd_device *obd = class_exp2obd(exp);
265         struct ptlrpc_request *req = *request;
266         int count = 0, rc;
267         ENTRY;
268
269         LASSERT(req == NULL);
270
271         if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
272             (fid_is_sane(&op_data->op_fid1)))
273                 count = mdc_resource_get_unused(exp, &op_data->op_fid1,
274                                                 &cancels, LCK_EX,
275                                                 MDS_INODELOCK_UPDATE);
276         if ((op_data->op_flags & MF_MDC_CANCEL_FID3) &&
277             (fid_is_sane(&op_data->op_fid3)))
278                 /* don't cancel DoM lock which may cause data flush */
279                 count += mdc_resource_get_unused(exp, &op_data->op_fid3,
280                                                  &cancels, LCK_EX,
281                                                  MDS_INODELOCK_ELC);
282         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
283                                    &RQF_MDS_REINT_UNLINK);
284         if (req == NULL) {
285                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
286                 RETURN(-ENOMEM);
287         }
288
289         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
290                              op_data->op_namelen + 1);
291
292         rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
293         if (rc) {
294                 ptlrpc_request_free(req);
295                 RETURN(rc);
296         }
297
298         mdc_unlink_pack(req, op_data);
299
300         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
301                              obd->u.cli.cl_default_mds_easize);
302         ptlrpc_request_set_replen(req);
303
304         *request = req;
305
306         rc = mdc_reint(req, LUSTRE_IMP_FULL);
307         if (rc == -ERESTARTSYS)
308                 rc = 0;
309         RETURN(rc);
310 }
311
312 int mdc_link(struct obd_export *exp, struct md_op_data *op_data,
313              struct ptlrpc_request **request)
314 {
315         struct list_head cancels = LIST_HEAD_INIT(cancels);
316         struct ptlrpc_request *req;
317         int count = 0, rc;
318         ENTRY;
319
320         if ((op_data->op_flags & MF_MDC_CANCEL_FID2) &&
321             (fid_is_sane(&op_data->op_fid2)))
322                 count = mdc_resource_get_unused(exp, &op_data->op_fid2,
323                                                 &cancels, LCK_EX,
324                                                 MDS_INODELOCK_UPDATE);
325         if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
326             (fid_is_sane(&op_data->op_fid1)))
327                 count += mdc_resource_get_unused(exp, &op_data->op_fid1,
328                                                  &cancels, LCK_EX,
329                                                  MDS_INODELOCK_UPDATE);
330
331         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_REINT_LINK);
332         if (req == NULL) {
333                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
334                 RETURN(-ENOMEM);
335         }
336
337         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
338                              op_data->op_namelen + 1);
339
340         rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
341         if (rc) {
342                 ptlrpc_request_free(req);
343                 RETURN(rc);
344         }
345
346         mdc_link_pack(req, op_data);
347         ptlrpc_request_set_replen(req);
348
349         rc = mdc_reint(req, LUSTRE_IMP_FULL);
350         *request = req;
351         if (rc == -ERESTARTSYS)
352                 rc = 0;
353
354         RETURN(rc);
355 }
356
357 int mdc_rename(struct obd_export *exp, struct md_op_data *op_data,
358                 const char *old, size_t oldlen, const char *new, size_t newlen,
359                 struct ptlrpc_request **request)
360 {
361         struct list_head cancels = LIST_HEAD_INIT(cancels);
362         struct obd_device *obd = exp->exp_obd;
363         struct ptlrpc_request *req;
364         int count = 0, rc;
365
366         ENTRY;
367
368         if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
369             (fid_is_sane(&op_data->op_fid1)))
370                 count = mdc_resource_get_unused(exp, &op_data->op_fid1,
371                                                 &cancels, LCK_EX,
372                                                 MDS_INODELOCK_UPDATE);
373         if ((op_data->op_flags & MF_MDC_CANCEL_FID2) &&
374             (fid_is_sane(&op_data->op_fid2)))
375                 count += mdc_resource_get_unused(exp, &op_data->op_fid2,
376                                                  &cancels, LCK_EX,
377                                                  MDS_INODELOCK_UPDATE);
378         if ((op_data->op_flags & MF_MDC_CANCEL_FID3) &&
379             (fid_is_sane(&op_data->op_fid3)))
380                 count += mdc_resource_get_unused(exp, &op_data->op_fid3,
381                                                  &cancels, LCK_EX,
382                                                  MDS_INODELOCK_LOOKUP);
383         if ((op_data->op_flags & MF_MDC_CANCEL_FID4) &&
384             (fid_is_sane(&op_data->op_fid4)))
385                 count += mdc_resource_get_unused(exp, &op_data->op_fid4,
386                                                  &cancels, LCK_EX,
387                                                  MDS_INODELOCK_ELC);
388
389         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
390                            op_data->op_cli_flags & CLI_MIGRATE ?
391                            &RQF_MDS_REINT_MIGRATE : &RQF_MDS_REINT_RENAME);
392         if (req == NULL) {
393                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
394                 RETURN(-ENOMEM);
395         }
396
397         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT, oldlen + 1);
398         req_capsule_set_size(&req->rq_pill, &RMF_SYMTGT, RCL_CLIENT, newlen+1);
399         if (op_data->op_cli_flags & CLI_MIGRATE)
400                 req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT,
401                                      op_data->op_data_size);
402
403         rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
404         if (rc) {
405                 ptlrpc_request_free(req);
406                 RETURN(rc);
407         }
408
409         if (exp_connect_cancelset(exp) && req)
410                 ldlm_cli_cancel_list(&cancels, count, req, 0);
411
412         if (op_data->op_cli_flags & CLI_MIGRATE)
413                 mdc_migrate_pack(req, op_data, old, oldlen);
414         else
415                 mdc_rename_pack(req, op_data, old, oldlen, new, newlen);
416
417         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
418                              obd->u.cli.cl_default_mds_easize);
419         ptlrpc_request_set_replen(req);
420
421         rc = mdc_reint(req, LUSTRE_IMP_FULL);
422         *request = req;
423         if (rc == -ERESTARTSYS)
424                 rc = 0;
425
426         RETURN(rc);
427 }
428
429 int mdc_file_resync(struct obd_export *exp, struct md_op_data *op_data)
430 {
431         struct list_head cancels = LIST_HEAD_INIT(cancels);
432         struct ptlrpc_request *req;
433         struct ldlm_lock *lock;
434         struct mdt_rec_resync *rec;
435         int count = 0, rc;
436         ENTRY;
437
438         if (op_data->op_flags & MF_MDC_CANCEL_FID1 &&
439             fid_is_sane(&op_data->op_fid1))
440                 count = mdc_resource_get_unused(exp, &op_data->op_fid1,
441                                                 &cancels, LCK_EX,
442                                                 MDS_INODELOCK_LAYOUT);
443
444         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
445                                    &RQF_MDS_REINT_RESYNC);
446         if (req == NULL) {
447                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
448                 RETURN(-ENOMEM);
449         }
450
451         rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
452         if (rc) {
453                 ptlrpc_request_free(req);
454                 RETURN(rc);
455         }
456
457         CLASSERT(sizeof(*rec) == sizeof(struct mdt_rec_reint));
458         rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
459         rec->rs_opcode  = REINT_RESYNC;
460         rec->rs_fsuid   = op_data->op_fsuid;
461         rec->rs_fsgid   = op_data->op_fsgid;
462         rec->rs_cap     = op_data->op_cap;
463         rec->rs_fid     = op_data->op_fid1;
464         rec->rs_bias    = op_data->op_bias;
465
466         lock = ldlm_handle2lock(&op_data->op_handle);
467         if (lock != NULL) {
468                 rec->rs_handle = lock->l_remote_handle;
469                 LDLM_LOCK_PUT(lock);
470         }
471
472         ptlrpc_request_set_replen(req);
473
474         rc = mdc_reint(req, LUSTRE_IMP_FULL);
475         if (rc == -ERESTARTSYS)
476                 rc = 0;
477
478         ptlrpc_req_finished(req);
479         RETURN(rc);
480 }