lustre/mdc/mdc_reint.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) 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  */
  31
  32 #define DEBUG_SUBSYSTEM S_MDC
  33
  34 #include <linux/module.h>
  35 #include <linux/kernel.h>
  36
  37 #include <obd_class.h>
  38 #include "mdc_internal.h"
  39 #include <lustre_fid.h>
  40
  41 /* mdc_setattr does its own semaphore handling */
  42 static int mdc_reint(struct ptlrpc_request *request, int level)
  43 {
  44         int rc;
  45
  46         request->rq_send_state = level;
  47
  48         ptlrpc_get_mod_rpc_slot(request);
  49         rc = ptlrpc_queue_wait(request);
  50         ptlrpc_put_mod_rpc_slot(request);
  51         if (rc)
  52                 CDEBUG(D_INFO, "error in handling %d\n", rc);
  53         else if (!req_capsule_server_get(&request->rq_pill, &RMF_MDT_BODY)) {
  54                 rc = -EPROTO;
  55         }
  56         return rc;
  57 }
  58
  59 /* Find and cancel locally locks matched by inode @bits & @mode in the resource
  60  * found by @fid. Found locks are added into @cancel list. Returns the amount of
  61  * locks added to @cancels list. */
  62 int mdc_resource_get_unused_res(struct obd_export *exp,
  63                                 struct ldlm_res_id *res_id,
  64                                 struct list_head *cancels,
  65                                 enum ldlm_mode mode, __u64 bits)
  66 {
  67         struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
  68         union ldlm_policy_data policy = { { 0 } };
  69         struct ldlm_resource *res;
  70         int count;
  71
  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         res = ldlm_resource_get(ns, NULL, res_id, 0, 0);
  84         if (IS_ERR(res))
  85                 RETURN(0);
  86         LDLM_RESOURCE_ADDREF(res);
  87         /* Initialize ibits lock policy. */
  88         policy.l_inodebits.bits = bits;
  89         count = ldlm_cancel_resource_local(res, cancels, &policy, mode, 0, 0,
  90                                            NULL);
  91         LDLM_RESOURCE_DELREF(res);
  92         ldlm_resource_putref(res);
  93         RETURN(count);
  94 }
  95
  96 int mdc_resource_get_unused(struct obd_export *exp, const struct lu_fid *fid,
  97                             struct list_head *cancels, enum ldlm_mode mode,
  98                             __u64 bits)
  99 {
 100         struct ldlm_res_id res_id;
 101
 102         fid_build_reg_res_name(fid, &res_id);
 103         return mdc_resource_get_unused_res(exp, &res_id, cancels, mode, bits);
 104 }
 105
 106 int mdc_setattr(struct obd_export *exp, struct md_op_data *op_data,
 107                 void *ea, size_t ealen, struct ptlrpc_request **request)
 108 {
 109         LIST_HEAD(cancels);
 110         struct ptlrpc_request *req;
 111         int count = 0, rc;
 112         __u64 bits;
 113         ENTRY;
 114
 115         LASSERT(op_data != NULL);
 116
 117         bits = MDS_INODELOCK_UPDATE;
 118         if (op_data->op_attr.ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID))
 119                 bits |= MDS_INODELOCK_LOOKUP;
 120         if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
 121             (fid_is_sane(&op_data->op_fid1)))
 122                 count = mdc_resource_get_unused(exp, &op_data->op_fid1,
 123                                                 &cancels, LCK_EX, bits);
 124         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 125                                    &RQF_MDS_REINT_SETATTR);
 126         if (req == NULL) {
 127                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
 128                 RETURN(-ENOMEM);
 129         }
 130
 131         req_capsule_set_size(&req->rq_pill, &RMF_MDT_EPOCH, RCL_CLIENT, 0);
 132         req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT, ealen);
 133         req_capsule_set_size(&req->rq_pill, &RMF_LOGCOOKIES, RCL_CLIENT, 0);
 134
 135         rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 136         if (rc) {
 137                 ptlrpc_request_free(req);
 138                 RETURN(rc);
 139         }
 140
 141         if (op_data->op_attr.ia_valid & (ATTR_MTIME | ATTR_CTIME))
 142                 CDEBUG(D_INODE, "setting mtime %lld, ctime %lld\n",
 143                        (s64)op_data->op_attr.ia_mtime.tv_sec,
 144                        (s64)op_data->op_attr.ia_ctime.tv_sec);
 145         mdc_setattr_pack(&req->rq_pill, op_data, ea, ealen);
 146
 147         req_capsule_set_size(&req->rq_pill, &RMF_ACL, RCL_SERVER, 0);
 148
 149         ptlrpc_request_set_replen(req);
 150
 151         rc = mdc_reint(req, LUSTRE_IMP_FULL);
 152         if (rc == -ERESTARTSYS)
 153                 rc = 0;
 154
 155         *request = req;
 156
 157         RETURN(rc);
 158 }
 159
 160 int mdc_create(struct obd_export *exp, struct md_op_data *op_data,
 161                 const void *data, size_t datalen,
 162                 umode_t mode, uid_t uid, gid_t gid,
 163                 kernel_cap_t cap_effective, __u64 rdev,
 164                 struct ptlrpc_request **request)
 165 {
 166         struct ptlrpc_request *req;
 167         int level, rc;
 168         int count, resends = 0;
 169         struct obd_import *import = exp->exp_obd->u.cli.cl_import;
 170         int generation = import->imp_generation;
 171         LIST_HEAD(cancels);
 172         ENTRY;
 173
 174         /* For case if upper layer did not alloc fid, do it now. */
 175         if (!fid_is_sane(&op_data->op_fid2)) {
 176                 /*
 177                  * mdc_fid_alloc() may return errno 1 in case of switch to new
 178                  * sequence, handle this.
 179                  */
 180                 rc = mdc_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
 181                 if (rc < 0)
 182                         RETURN(rc);
 183         }
 184
 185 rebuild:
 186         count = 0;
 187         if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
 188             (fid_is_sane(&op_data->op_fid1)))
 189                 count = mdc_resource_get_unused(exp, &op_data->op_fid1,
 190                                                 &cancels, LCK_EX,
 191                                                 MDS_INODELOCK_UPDATE);
 192
 193         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 194                                    &RQF_MDS_REINT_CREATE_ACL);
 195         if (req == NULL) {
 196                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
 197                 RETURN(-ENOMEM);
 198         }
 199
 200         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 201                              op_data->op_namelen + 1);
 202         req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT,
 203                              data && datalen ? datalen : 0);
 204
 205         req_capsule_set_size(&req->rq_pill, &RMF_FILE_SECCTX_NAME,
 206                              RCL_CLIENT, op_data->op_file_secctx_name != NULL ?
 207                              strlen(op_data->op_file_secctx_name) + 1 : 0);
 208
 209         req_capsule_set_size(&req->rq_pill, &RMF_FILE_SECCTX, RCL_CLIENT,
 210                              op_data->op_file_secctx_size);
 211
 212         req_capsule_set_size(&req->rq_pill, &RMF_FILE_ENCCTX, RCL_CLIENT,
 213                              op_data->op_file_encctx_size);
 214
 215         /* get SELinux policy info if any */
 216         rc = sptlrpc_get_sepol(req);
 217         if (rc < 0) {
 218                 ptlrpc_request_free(req);
 219                 RETURN(rc);
 220         }
 221         req_capsule_set_size(&req->rq_pill, &RMF_SELINUX_POL, RCL_CLIENT,
 222                              strlen(req->rq_sepol) ?
 223                              strlen(req->rq_sepol) + 1 : 0);
 224
 225         rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 226         if (rc) {
 227                 ptlrpc_request_free(req);
 228                 RETURN(rc);
 229         }
 230
 231         /*
 232          * mdc_create_pack() fills msg->bufs[1] with name and msg->bufs[2] with
 233          * tgt, for symlinks or lov MD data.
 234          */
 235         mdc_create_pack(&req->rq_pill, op_data, data, datalen, mode, uid,
 236                         gid, cap_effective, rdev);
 237
 238         ptlrpc_request_set_replen(req);
 239
 240         /* ask ptlrpc not to resend on EINPROGRESS since we have our own retry
 241          * logic here */
 242         req->rq_no_retry_einprogress = 1;
 243
 244         if (resends) {
 245                 req->rq_generation_set = 1;
 246                 req->rq_import_generation = generation;
 247                 req->rq_sent = ktime_get_real_seconds() + resends;
 248         }
 249         level = LUSTRE_IMP_FULL;
 250  resend:
 251         rc = mdc_reint(req, level);
 252
 253         /* Resend if we were told to. */
 254         if (rc == -ERESTARTSYS) {
 255                 level = LUSTRE_IMP_RECOVER;
 256                 goto resend;
 257         } else if (rc == -EINPROGRESS) {
 258                 /* Retry create infinitely until succeed or get other
 259                  * error code or interrupted. */
 260                 ptlrpc_req_finished(req);
 261                 if (generation == import->imp_generation) {
 262                         if (signal_pending(current))
 263                                 RETURN(-EINTR);
 264
 265                         resends++;
 266                         CDEBUG(D_HA, "%s: resend:%d create on "DFID"/"DFID"\n",
 267                                exp->exp_obd->obd_name, resends,
 268                                PFID(&op_data->op_fid1),
 269                                PFID(&op_data->op_fid2));
 270                         goto rebuild;
 271                 } else {
 272                         CDEBUG(D_HA, "resend cross eviction\n");
 273                         RETURN(-EIO);
 274                 }
 275         }
 276
 277         *request = req;
 278         RETURN(rc);
 279 }
 280
 281 int mdc_unlink(struct obd_export *exp, struct md_op_data *op_data,
 282                struct ptlrpc_request **request)
 283 {
 284         LIST_HEAD(cancels);
 285         struct obd_device *obd = class_exp2obd(exp);
 286         struct ptlrpc_request *req = *request;
 287         int count = 0, rc;
 288         ENTRY;
 289
 290         LASSERT(req == NULL);
 291
 292         if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
 293             (fid_is_sane(&op_data->op_fid1)))
 294                 count = mdc_resource_get_unused(exp, &op_data->op_fid1,
 295                                                 &cancels, LCK_EX,
 296                                                 MDS_INODELOCK_UPDATE);
 297         if ((op_data->op_flags & MF_MDC_CANCEL_FID3) &&
 298             (fid_is_sane(&op_data->op_fid3)))
 299                 /* cancel DOM lock only if it has no data to flush */
 300                 count += mdc_resource_get_unused(exp, &op_data->op_fid3,
 301                                                  &cancels, LCK_EX,
 302                                                  op_data->op_cli_flags &
 303                                                  CLI_DIRTY_DATA ?
 304                                                  MDS_INODELOCK_ELC :
 305                                                  MDS_INODELOCK_FULL);
 306         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 307                                    &RQF_MDS_REINT_UNLINK);
 308         if (req == NULL) {
 309                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
 310                 RETURN(-ENOMEM);
 311         }
 312
 313         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 314                              op_data->op_namelen + 1);
 315
 316         /* get SELinux policy info if any */
 317         rc = sptlrpc_get_sepol(req);
 318         if (rc < 0) {
 319                 ptlrpc_request_free(req);
 320                 RETURN(rc);
 321         }
 322         req_capsule_set_size(&req->rq_pill, &RMF_SELINUX_POL, RCL_CLIENT,
 323                              strlen(req->rq_sepol) ?
 324                              strlen(req->rq_sepol) + 1 : 0);
 325
 326         rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 327         if (rc) {
 328                 ptlrpc_request_free(req);
 329                 RETURN(rc);
 330         }
 331
 332         mdc_unlink_pack(&req->rq_pill, op_data);
 333
 334         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 335                              obd->u.cli.cl_default_mds_easize);
 336         ptlrpc_request_set_replen(req);
 337
 338         *request = req;
 339
 340         rc = mdc_reint(req, LUSTRE_IMP_FULL);
 341         if (rc == -ERESTARTSYS)
 342                 rc = 0;
 343         RETURN(rc);
 344 }
 345
 346 int mdc_link(struct obd_export *exp, struct md_op_data *op_data,
 347              struct ptlrpc_request **request)
 348 {
 349         LIST_HEAD(cancels);
 350         struct ptlrpc_request *req;
 351         int count = 0, rc;
 352         ENTRY;
 353
 354         if ((op_data->op_flags & MF_MDC_CANCEL_FID2) &&
 355             (fid_is_sane(&op_data->op_fid2)))
 356                 count = mdc_resource_get_unused(exp, &op_data->op_fid2,
 357                                                 &cancels, LCK_EX,
 358                                                 MDS_INODELOCK_UPDATE);
 359         if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
 360             (fid_is_sane(&op_data->op_fid1)))
 361                 count += mdc_resource_get_unused(exp, &op_data->op_fid1,
 362                                                  &cancels, LCK_EX,
 363                                                  MDS_INODELOCK_UPDATE);
 364
 365         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_REINT_LINK);
 366         if (req == NULL) {
 367                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
 368                 RETURN(-ENOMEM);
 369         }
 370
 371         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 372                              op_data->op_namelen + 1);
 373
 374         /* get SELinux policy info if any */
 375         rc = sptlrpc_get_sepol(req);
 376         if (rc < 0) {
 377                 ptlrpc_request_free(req);
 378                 RETURN(rc);
 379         }
 380         req_capsule_set_size(&req->rq_pill, &RMF_SELINUX_POL, RCL_CLIENT,
 381                              strlen(req->rq_sepol) ?
 382                              strlen(req->rq_sepol) + 1 : 0);
 383
 384         rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 385         if (rc) {
 386                 ptlrpc_request_free(req);
 387                 RETURN(rc);
 388         }
 389
 390         mdc_link_pack(&req->rq_pill, op_data);
 391         ptlrpc_request_set_replen(req);
 392
 393         rc = mdc_reint(req, LUSTRE_IMP_FULL);
 394         *request = req;
 395         if (rc == -ERESTARTSYS)
 396                 rc = 0;
 397
 398         RETURN(rc);
 399 }
 400
 401 int mdc_rename(struct obd_export *exp, struct md_op_data *op_data,
 402                 const char *old, size_t oldlen, const char *new, size_t newlen,
 403                 struct ptlrpc_request **request)
 404 {
 405         LIST_HEAD(cancels);
 406         struct obd_device *obd = exp->exp_obd;
 407         struct ptlrpc_request *req;
 408         int count = 0, rc;
 409
 410         ENTRY;
 411
 412         if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
 413             (fid_is_sane(&op_data->op_fid1)))
 414                 count = mdc_resource_get_unused(exp, &op_data->op_fid1,
 415                                                 &cancels, LCK_EX,
 416                                                 MDS_INODELOCK_UPDATE);
 417         if ((op_data->op_flags & MF_MDC_CANCEL_FID2) &&
 418             (fid_is_sane(&op_data->op_fid2)))
 419                 count += mdc_resource_get_unused(exp, &op_data->op_fid2,
 420                                                  &cancels, LCK_EX,
 421                                                  MDS_INODELOCK_UPDATE);
 422         if ((op_data->op_flags & MF_MDC_CANCEL_FID3) &&
 423             (fid_is_sane(&op_data->op_fid3)))
 424                 count += mdc_resource_get_unused(exp, &op_data->op_fid3,
 425                                                  &cancels, LCK_EX,
 426                                                  MDS_INODELOCK_LOOKUP);
 427         if ((op_data->op_flags & MF_MDC_CANCEL_FID4) &&
 428             (fid_is_sane(&op_data->op_fid4)))
 429                 count += mdc_resource_get_unused(exp, &op_data->op_fid4,
 430                                                  &cancels, LCK_EX,
 431                                                  MDS_INODELOCK_ELC);
 432
 433         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 434                            op_data->op_cli_flags & CLI_MIGRATE ?
 435                            &RQF_MDS_REINT_MIGRATE : &RQF_MDS_REINT_RENAME);
 436         if (req == NULL) {
 437                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
 438                 RETURN(-ENOMEM);
 439         }
 440
 441         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT, oldlen + 1);
 442         req_capsule_set_size(&req->rq_pill, &RMF_SYMTGT, RCL_CLIENT, newlen+1);
 443         if (op_data->op_cli_flags & CLI_MIGRATE)
 444                 req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT,
 445                                      op_data->op_data_size);
 446
 447         /* get SELinux policy info if any */
 448         rc = sptlrpc_get_sepol(req);
 449         if (rc < 0) {
 450                 ptlrpc_request_free(req);
 451                 RETURN(rc);
 452         }
 453         req_capsule_set_size(&req->rq_pill, &RMF_SELINUX_POL, RCL_CLIENT,
 454                              strlen(req->rq_sepol) ?
 455                              strlen(req->rq_sepol) + 1 : 0);
 456
 457         rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 458         if (rc) {
 459                 ptlrpc_request_free(req);
 460                 RETURN(rc);
 461         }
 462
 463         if (exp_connect_cancelset(exp) && req)
 464                 ldlm_cli_cancel_list(&cancels, count, req, 0);
 465
 466         if (op_data->op_cli_flags & CLI_MIGRATE)
 467                 mdc_migrate_pack(&req->rq_pill, op_data, old, oldlen);
 468         else
 469                 mdc_rename_pack(&req->rq_pill, op_data, old, oldlen,
 470                                 new, newlen);
 471
 472         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 473                              obd->u.cli.cl_default_mds_easize);
 474         ptlrpc_request_set_replen(req);
 475
 476         rc = mdc_reint(req, LUSTRE_IMP_FULL);
 477         *request = req;
 478         if (rc == -ERESTARTSYS)
 479                 rc = 0;
 480
 481         RETURN(rc);
 482 }
 483
 484 int mdc_file_resync(struct obd_export *exp, struct md_op_data *op_data)
 485 {
 486         LIST_HEAD(cancels);
 487         struct ptlrpc_request *req;
 488         struct ldlm_lock *lock;
 489         struct mdt_rec_resync *rec;
 490         int count = 0, rc;
 491         ENTRY;
 492
 493         if (op_data->op_flags & MF_MDC_CANCEL_FID1 &&
 494             fid_is_sane(&op_data->op_fid1))
 495                 count = mdc_resource_get_unused(exp, &op_data->op_fid1,
 496                                                 &cancels, LCK_EX,
 497                                                 MDS_INODELOCK_LAYOUT);
 498
 499         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 500                                    &RQF_MDS_REINT_RESYNC);
 501         if (req == NULL) {
 502                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
 503                 RETURN(-ENOMEM);
 504         }
 505
 506         rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 507         if (rc) {
 508                 ptlrpc_request_free(req);
 509                 RETURN(rc);
 510         }
 511
 512         BUILD_BUG_ON(sizeof(*rec) != sizeof(struct mdt_rec_reint));
 513         rec = req_capsule_client_get(&req->rq_pill, &RMF_REC_REINT);
 514         rec->rs_opcode  = REINT_RESYNC;
 515         rec->rs_fsuid   = op_data->op_fsuid;
 516         rec->rs_fsgid   = op_data->op_fsgid;
 517         rec->rs_cap     = op_data->op_cap.cap[0];
 518         rec->rs_fid     = op_data->op_fid1;
 519         rec->rs_bias    = op_data->op_bias;
 520         rec->rs_mirror_id = op_data->op_mirror_id;
 521
 522         lock = ldlm_handle2lock(&op_data->op_lease_handle);
 523         if (lock != NULL) {
 524                 rec->rs_lease_handle = lock->l_remote_handle;
 525                 LDLM_LOCK_PUT(lock);
 526         }
 527
 528         ptlrpc_request_set_replen(req);
 529
 530         rc = mdc_reint(req, LUSTRE_IMP_FULL);
 531         if (rc == -ERESTARTSYS)
 532                 rc = 0;
 533
 534         ptlrpc_req_finished(req);
 535         RETURN(rc);
 536 }