drivers/staging/lustre/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) 2011, 2015, 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 "../include/obd_class.h"
  39 #include "mdc_internal.h"
  40 #include "../include/lustre_fid.h"
  41
  42 /* mdc_setattr does its own semaphore handling */
  43 static int mdc_reint(struct ptlrpc_request *request,
  44                      struct mdc_rpc_lock *rpc_lock,
  45                      int level)
  46 {
  47         int rc;
  48
  49         request->rq_send_state = level;
  50
  51         mdc_get_rpc_lock(rpc_lock, NULL);
  52         rc = ptlrpc_queue_wait(request);
  53         mdc_put_rpc_lock(rpc_lock, NULL);
  54         if (rc)
  55                 CDEBUG(D_INFO, "error in handling %d\n", rc);
  56         else if (!req_capsule_server_get(&request->rq_pill, &RMF_MDT_BODY))
  57                 rc = -EPROTO;
  58
  59         return rc;
  60 }
  61
  62 /* Find and cancel locally locks matched by inode @bits & @mode in the resource
  63  * found by @fid. Found locks are added into @cancel list. Returns the amount of
  64  * locks added to @cancels list.
  65  */
  66 int mdc_resource_get_unused(struct obd_export *exp, const struct lu_fid *fid,
  67                             struct list_head *cancels, enum ldlm_mode mode,
  68                             __u64 bits)
  69 {
  70         struct ldlm_namespace *ns = exp->exp_obd->obd_namespace;
  71         ldlm_policy_data_t policy = {};
  72         struct ldlm_res_id res_id;
  73         struct ldlm_resource *res;
  74         int count;
  75
  76         /* Return, i.e. cancel nothing, only if ELC is supported (flag in
  77          * export) but disabled through procfs (flag in NS).
  78          *
  79          * This distinguishes from a case when ELC is not supported originally,
  80          * when we still want to cancel locks in advance and just cancel them
  81          * locally, without sending any RPC.
  82          */
  83         if (exp_connect_cancelset(exp) && !ns_connect_cancelset(ns))
  84                 return 0;
  85
  86         fid_build_reg_res_name(fid, &res_id);
  87         res = ldlm_resource_get(exp->exp_obd->obd_namespace,
  88                                 NULL, &res_id, 0, 0);
  89         if (!res)
  90                 return 0;
  91         LDLM_RESOURCE_ADDREF(res);
  92         /* Initialize ibits lock policy. */
  93         policy.l_inodebits.bits = bits;
  94         count = ldlm_cancel_resource_local(res, cancels, &policy,
  95                                            mode, 0, 0, NULL);
  96         LDLM_RESOURCE_DELREF(res);
  97         ldlm_resource_putref(res);
  98         return count;
  99 }
 100
 101 int mdc_setattr(struct obd_export *exp, struct md_op_data *op_data,
 102                 void *ea, int ealen, void *ea2, int ea2len,
 103                 struct ptlrpc_request **request, struct md_open_data **mod)
 104 {
 105         LIST_HEAD(cancels);
 106         struct ptlrpc_request *req;
 107         struct mdc_rpc_lock *rpc_lock;
 108         struct obd_device *obd = exp->exp_obd;
 109         int count = 0, rc;
 110         __u64 bits;
 111
 112         bits = MDS_INODELOCK_UPDATE;
 113         if (op_data->op_attr.ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID))
 114                 bits |= MDS_INODELOCK_LOOKUP;
 115         if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
 116             (fid_is_sane(&op_data->op_fid1)) &&
 117             !OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK_NET))
 118                 count = mdc_resource_get_unused(exp, &op_data->op_fid1,
 119                                                 &cancels, LCK_EX, bits);
 120         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 121                                    &RQF_MDS_REINT_SETATTR);
 122         if (!req) {
 123                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
 124                 return -ENOMEM;
 125         }
 126         if ((op_data->op_flags & (MF_SOM_CHANGE | MF_EPOCH_OPEN)) == 0)
 127                 req_capsule_set_size(&req->rq_pill, &RMF_MDT_EPOCH, RCL_CLIENT,
 128                                      0);
 129         req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT, ealen);
 130         req_capsule_set_size(&req->rq_pill, &RMF_LOGCOOKIES, RCL_CLIENT,
 131                              ea2len);
 132
 133         rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 134         if (rc) {
 135                 ptlrpc_request_free(req);
 136                 return rc;
 137         }
 138
 139         rpc_lock = obd->u.cli.cl_rpc_lock;
 140
 141         if (op_data->op_attr.ia_valid & (ATTR_MTIME | ATTR_CTIME))
 142                 CDEBUG(D_INODE, "setting mtime %ld, ctime %ld\n",
 143                        LTIME_S(op_data->op_attr.ia_mtime),
 144                        LTIME_S(op_data->op_attr.ia_ctime));
 145         mdc_setattr_pack(req, op_data, ea, ealen, ea2, ea2len);
 146
 147         ptlrpc_request_set_replen(req);
 148         if (mod && (op_data->op_flags & MF_EPOCH_OPEN) &&
 149             req->rq_import->imp_replayable) {
 150                 LASSERT(!*mod);
 151
 152                 *mod = obd_mod_alloc();
 153                 if (!*mod) {
 154                         DEBUG_REQ(D_ERROR, req, "Can't allocate md_open_data");
 155                 } else {
 156                         req->rq_replay = 1;
 157                         req->rq_cb_data = *mod;
 158                         (*mod)->mod_open_req = req;
 159                         req->rq_commit_cb = mdc_commit_open;
 160                         (*mod)->mod_is_create = true;
 161                         /**
 162                          * Take an extra reference on \var mod, it protects \var
 163                          * mod from being freed on eviction (commit callback is
 164                          * called despite rq_replay flag).
 165                          * Will be put on mdc_done_writing().
 166                          */
 167                         obd_mod_get(*mod);
 168                 }
 169         }
 170
 171         rc = mdc_reint(req, rpc_lock, LUSTRE_IMP_FULL);
 172
 173         /* Save the obtained info in the original RPC for the replay case. */
 174         if (rc == 0 && (op_data->op_flags & MF_EPOCH_OPEN)) {
 175                 struct mdt_ioepoch *epoch;
 176                 struct mdt_body  *body;
 177
 178                 epoch = req_capsule_client_get(&req->rq_pill, &RMF_MDT_EPOCH);
 179                 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 180                 epoch->handle = body->handle;
 181                 epoch->ioepoch = body->ioepoch;
 182                 req->rq_replay_cb = mdc_replay_open;
 183         /** bug 3633, open may be committed and estale answer is not error */
 184         } else if (rc == -ESTALE && (op_data->op_flags & MF_SOM_CHANGE)) {
 185                 rc = 0;
 186         } else if (rc == -ERESTARTSYS) {
 187                 rc = 0;
 188         }
 189         *request = req;
 190         if (rc && req->rq_commit_cb) {
 191                 /* Put an extra reference on \var mod on error case. */
 192                 if (mod && *mod)
 193                         obd_mod_put(*mod);
 194                 req->rq_commit_cb(req);
 195         }
 196         return rc;
 197 }
 198
 199 int mdc_create(struct obd_export *exp, struct md_op_data *op_data,
 200                const void *data, int datalen, int mode, __u32 uid, __u32 gid,
 201                cfs_cap_t cap_effective, __u64 rdev,
 202                struct ptlrpc_request **request)
 203 {
 204         struct ptlrpc_request *req;
 205         int level, rc;
 206         int count, resends = 0;
 207         struct obd_import *import = exp->exp_obd->u.cli.cl_import;
 208         int generation = import->imp_generation;
 209         LIST_HEAD(cancels);
 210
 211         /* For case if upper layer did not alloc fid, do it now. */
 212         if (!fid_is_sane(&op_data->op_fid2)) {
 213                 /*
 214                  * mdc_fid_alloc() may return errno 1 in case of switch to new
 215                  * sequence, handle this.
 216                  */
 217                 rc = mdc_fid_alloc(exp, &op_data->op_fid2, op_data);
 218                 if (rc < 0) {
 219                         CERROR("Can't alloc new fid, rc %d\n", rc);
 220                         return rc;
 221                 }
 222         }
 223
 224 rebuild:
 225         count = 0;
 226         if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
 227             (fid_is_sane(&op_data->op_fid1)))
 228                 count = mdc_resource_get_unused(exp, &op_data->op_fid1,
 229                                                 &cancels, LCK_EX,
 230                                                 MDS_INODELOCK_UPDATE);
 231
 232         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 233                                    &RQF_MDS_REINT_CREATE_ACL);
 234         if (!req) {
 235                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
 236                 return -ENOMEM;
 237         }
 238         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 239                              op_data->op_namelen + 1);
 240         req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_CLIENT,
 241                              data && datalen ? datalen : 0);
 242
 243         rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 244         if (rc) {
 245                 ptlrpc_request_free(req);
 246                 return rc;
 247         }
 248
 249         /*
 250          * mdc_create_pack() fills msg->bufs[1] with name and msg->bufs[2] with
 251          * tgt, for symlinks or lov MD data.
 252          */
 253         mdc_create_pack(req, op_data, data, datalen, mode, uid,
 254                         gid, cap_effective, rdev);
 255
 256         ptlrpc_request_set_replen(req);
 257
 258         /* ask ptlrpc not to resend on EINPROGRESS since we have our own retry
 259          * logic here
 260          */
 261         req->rq_no_retry_einprogress = 1;
 262
 263         if (resends) {
 264                 req->rq_generation_set = 1;
 265                 req->rq_import_generation = generation;
 266                 req->rq_sent = ktime_get_real_seconds() + resends;
 267         }
 268         level = LUSTRE_IMP_FULL;
 269  resend:
 270         rc = mdc_reint(req, exp->exp_obd->u.cli.cl_rpc_lock, level);
 271
 272         /* Resend if we were told to. */
 273         if (rc == -ERESTARTSYS) {
 274                 level = LUSTRE_IMP_RECOVER;
 275                 goto resend;
 276         } else if (rc == -EINPROGRESS) {
 277                 /* Retry create infinitely until succeed or get other
 278                  * error code.
 279                  */
 280                 ptlrpc_req_finished(req);
 281                 resends++;
 282
 283                 CDEBUG(D_HA, "%s: resend:%d create on "DFID"/"DFID"\n",
 284                        exp->exp_obd->obd_name, resends,
 285                        PFID(&op_data->op_fid1), PFID(&op_data->op_fid2));
 286
 287                 if (generation == import->imp_generation) {
 288                         goto rebuild;
 289                 } else {
 290                         CDEBUG(D_HA, "resend cross eviction\n");
 291                         return -EIO;
 292                 }
 293         }
 294
 295         *request = req;
 296         return rc;
 297 }
 298
 299 int mdc_unlink(struct obd_export *exp, struct md_op_data *op_data,
 300                struct ptlrpc_request **request)
 301 {
 302         LIST_HEAD(cancels);
 303         struct obd_device *obd = class_exp2obd(exp);
 304         struct ptlrpc_request *req = *request;
 305         int count = 0, rc;
 306
 307         LASSERT(!req);
 308
 309         if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
 310             (fid_is_sane(&op_data->op_fid1)) &&
 311             !OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK_NET))
 312                 count = mdc_resource_get_unused(exp, &op_data->op_fid1,
 313                                                 &cancels, LCK_EX,
 314                                                 MDS_INODELOCK_UPDATE);
 315         if ((op_data->op_flags & MF_MDC_CANCEL_FID3) &&
 316             (fid_is_sane(&op_data->op_fid3)) &&
 317             !OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK_NET))
 318                 count += mdc_resource_get_unused(exp, &op_data->op_fid3,
 319                                                  &cancels, LCK_EX,
 320                                                  MDS_INODELOCK_FULL);
 321         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 322                                    &RQF_MDS_REINT_UNLINK);
 323         if (!req) {
 324                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
 325                 return -ENOMEM;
 326         }
 327         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 328                              op_data->op_namelen + 1);
 329
 330         rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 331         if (rc) {
 332                 ptlrpc_request_free(req);
 333                 return rc;
 334         }
 335
 336         mdc_unlink_pack(req, op_data);
 337
 338         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 339                              obd->u.cli.cl_default_mds_easize);
 340         req_capsule_set_size(&req->rq_pill, &RMF_LOGCOOKIES, RCL_SERVER,
 341                              obd->u.cli.cl_default_mds_cookiesize);
 342         ptlrpc_request_set_replen(req);
 343
 344         *request = req;
 345
 346         rc = mdc_reint(req, obd->u.cli.cl_rpc_lock, LUSTRE_IMP_FULL);
 347         if (rc == -ERESTARTSYS)
 348                 rc = 0;
 349         return rc;
 350 }
 351
 352 int mdc_link(struct obd_export *exp, struct md_op_data *op_data,
 353              struct ptlrpc_request **request)
 354 {
 355         LIST_HEAD(cancels);
 356         struct obd_device *obd = exp->exp_obd;
 357         struct ptlrpc_request *req;
 358         int count = 0, rc;
 359
 360         if ((op_data->op_flags & MF_MDC_CANCEL_FID2) &&
 361             (fid_is_sane(&op_data->op_fid2)))
 362                 count = mdc_resource_get_unused(exp, &op_data->op_fid2,
 363                                                 &cancels, LCK_EX,
 364                                                 MDS_INODELOCK_UPDATE);
 365         if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
 366             (fid_is_sane(&op_data->op_fid1)))
 367                 count += mdc_resource_get_unused(exp, &op_data->op_fid1,
 368                                                  &cancels, LCK_EX,
 369                                                  MDS_INODELOCK_UPDATE);
 370
 371         req = ptlrpc_request_alloc(class_exp2cliimp(exp), &RQF_MDS_REINT_LINK);
 372         if (!req) {
 373                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
 374                 return -ENOMEM;
 375         }
 376         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 377                              op_data->op_namelen + 1);
 378
 379         rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 380         if (rc) {
 381                 ptlrpc_request_free(req);
 382                 return rc;
 383         }
 384
 385         mdc_link_pack(req, op_data);
 386         ptlrpc_request_set_replen(req);
 387
 388         rc = mdc_reint(req, obd->u.cli.cl_rpc_lock, LUSTRE_IMP_FULL);
 389         *request = req;
 390         if (rc == -ERESTARTSYS)
 391                 rc = 0;
 392
 393         return rc;
 394 }
 395
 396 int mdc_rename(struct obd_export *exp, struct md_op_data *op_data,
 397                const char *old, int oldlen, const char *new, int newlen,
 398                struct ptlrpc_request **request)
 399 {
 400         LIST_HEAD(cancels);
 401         struct obd_device *obd = exp->exp_obd;
 402         struct ptlrpc_request *req;
 403         int count = 0, rc;
 404
 405         if ((op_data->op_flags & MF_MDC_CANCEL_FID1) &&
 406             (fid_is_sane(&op_data->op_fid1)))
 407                 count = mdc_resource_get_unused(exp, &op_data->op_fid1,
 408                                                 &cancels, LCK_EX,
 409                                                 MDS_INODELOCK_UPDATE);
 410         if ((op_data->op_flags & MF_MDC_CANCEL_FID2) &&
 411             (fid_is_sane(&op_data->op_fid2)))
 412                 count += mdc_resource_get_unused(exp, &op_data->op_fid2,
 413                                                  &cancels, LCK_EX,
 414                                                  MDS_INODELOCK_UPDATE);
 415         if ((op_data->op_flags & MF_MDC_CANCEL_FID3) &&
 416             (fid_is_sane(&op_data->op_fid3)))
 417                 count += mdc_resource_get_unused(exp, &op_data->op_fid3,
 418                                                  &cancels, LCK_EX,
 419                                                  MDS_INODELOCK_LOOKUP);
 420         if ((op_data->op_flags & MF_MDC_CANCEL_FID4) &&
 421             (fid_is_sane(&op_data->op_fid4)))
 422                 count += mdc_resource_get_unused(exp, &op_data->op_fid4,
 423                                                  &cancels, LCK_EX,
 424                                                  MDS_INODELOCK_FULL);
 425
 426         req = ptlrpc_request_alloc(class_exp2cliimp(exp),
 427                                    &RQF_MDS_REINT_RENAME);
 428         if (!req) {
 429                 ldlm_lock_list_put(&cancels, l_bl_ast, count);
 430                 return -ENOMEM;
 431         }
 432
 433         req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT, oldlen + 1);
 434         req_capsule_set_size(&req->rq_pill, &RMF_SYMTGT, RCL_CLIENT, newlen+1);
 435
 436         rc = mdc_prep_elc_req(exp, req, MDS_REINT, &cancels, count);
 437         if (rc) {
 438                 ptlrpc_request_free(req);
 439                 return rc;
 440         }
 441
 442         if (exp_connect_cancelset(exp) && req)
 443                 ldlm_cli_cancel_list(&cancels, count, req, 0);
 444
 445         mdc_rename_pack(req, op_data, old, oldlen, new, newlen);
 446
 447         req_capsule_set_size(&req->rq_pill, &RMF_MDT_MD, RCL_SERVER,
 448                              obd->u.cli.cl_default_mds_easize);
 449         req_capsule_set_size(&req->rq_pill, &RMF_LOGCOOKIES, RCL_SERVER,
 450                              obd->u.cli.cl_default_mds_cookiesize);
 451         ptlrpc_request_set_replen(req);
 452
 453         rc = mdc_reint(req, obd->u.cli.cl_rpc_lock, LUSTRE_IMP_FULL);
 454         *request = req;
 455         if (rc == -ERESTARTSYS)
 456                 rc = 0;
 457
 458         return rc;
 459 }