lustre/lmv/lmv_intent.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) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2016, 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_LMV
  34 #include <linux/slab.h>
  35 #include <linux/module.h>
  36 #include <linux/init.h>
  37 #include <linux/slab.h>
  38 #include <linux/pagemap.h>
  39 #include <linux/math64.h>
  40 #include <linux/seq_file.h>
  41 #include <linux/namei.h>
  42 #include <lustre_intent.h>
  43
  44 #include <obd_support.h>
  45 #include <lustre_lib.h>
  46 #include <lustre_net.h>
  47 #include <lustre_dlm.h>
  48 #include <lustre_mdc.h>
  49 #include <obd_class.h>
  50 #include <lprocfs_status.h>
  51 #include "lmv_internal.h"
  52
  53 static int lmv_intent_remote(struct obd_export *exp, struct lookup_intent *it,
  54                              const struct lu_fid *parent_fid,
  55                              struct ptlrpc_request **reqp,
  56                              ldlm_blocking_callback cb_blocking,
  57                              __u64 extra_lock_flags,
  58                              const char *secctx_name, __u32 secctx_name_size)
  59 {
  60         struct obd_device       *obd = exp->exp_obd;
  61         struct lmv_obd          *lmv = &obd->u.lmv;
  62         struct ptlrpc_request   *req = NULL;
  63         struct lustre_handle    plock;
  64         struct md_op_data       *op_data;
  65         struct lmv_tgt_desc     *tgt;
  66         struct mdt_body         *body;
  67         int                     pmode;
  68         int                     rc = 0;
  69         ENTRY;
  70
  71         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
  72         if (body == NULL)
  73                 RETURN(-EPROTO);
  74
  75         LASSERT((body->mbo_valid & OBD_MD_MDS));
  76
  77         /*
  78          * We got LOOKUP lock, but we really need attrs.
  79          */
  80         pmode = it->it_lock_mode;
  81         if (pmode) {
  82                 plock.cookie = it->it_lock_handle;
  83                 it->it_lock_mode = 0;
  84                 it->it_request = NULL;
  85         }
  86
  87         LASSERT(fid_is_sane(&body->mbo_fid1));
  88
  89         tgt = lmv_find_target(lmv, &body->mbo_fid1);
  90         if (IS_ERR(tgt))
  91                 GOTO(out, rc = PTR_ERR(tgt));
  92
  93         OBD_ALLOC_PTR(op_data);
  94         if (op_data == NULL)
  95                 GOTO(out, rc = -ENOMEM);
  96
  97         op_data->op_fid1 = body->mbo_fid1;
  98         /* Sent the parent FID to the remote MDT */
  99         if (parent_fid != NULL) {
 100                 /* The parent fid is only for remote open to
 101                  * check whether the open is from OBF,
 102                  * see mdt_cross_open */
 103                 LASSERT(it->it_op & IT_OPEN);
 104                 op_data->op_fid2 = *parent_fid;
 105         }
 106
 107         op_data->op_bias = MDS_CROSS_REF;
 108         CDEBUG(D_INODE, "REMOTE_INTENT with fid="DFID" -> mds #%u\n",
 109                PFID(&body->mbo_fid1), tgt->ltd_index);
 110
 111         /* ask for security context upon intent */
 112         if (it->it_op & (IT_LOOKUP | IT_GETATTR | IT_OPEN) &&
 113             secctx_name_size != 0 && secctx_name != NULL) {
 114                 op_data->op_file_secctx_name = secctx_name;
 115                 op_data->op_file_secctx_name_size = secctx_name_size;
 116                 CDEBUG(D_SEC, "'%.*s' is security xattr to fetch for "
 117                        DFID"\n",
 118                        secctx_name_size, secctx_name, PFID(&body->mbo_fid1));
 119         }
 120
 121         rc = md_intent_lock(tgt->ltd_exp, op_data, it, &req, cb_blocking,
 122                             extra_lock_flags);
 123         if (rc)
 124                 GOTO(out_free_op_data, rc);
 125
 126         /*
 127          * LLite needs LOOKUP lock to track dentry revocation in order to
 128          * maintain dcache consistency. Thus drop UPDATE|PERM lock here
 129          * and put LOOKUP in request.
 130          */
 131         if (it->it_lock_mode != 0) {
 132                 it->it_remote_lock_handle =
 133                                         it->it_lock_handle;
 134                 it->it_remote_lock_mode = it->it_lock_mode;
 135         }
 136
 137         if (pmode) {
 138                 it->it_lock_handle = plock.cookie;
 139                 it->it_lock_mode = pmode;
 140         }
 141
 142         EXIT;
 143 out_free_op_data:
 144         OBD_FREE_PTR(op_data);
 145 out:
 146         if (rc && pmode)
 147                 ldlm_lock_decref(&plock, pmode);
 148
 149         ptlrpc_req_finished(*reqp);
 150         *reqp = req;
 151         return rc;
 152 }
 153
 154 int lmv_revalidate_slaves(struct obd_export *exp,
 155                           const struct lmv_stripe_md *lsm,
 156                           ldlm_blocking_callback cb_blocking,
 157                           int extra_lock_flags)
 158 {
 159         struct obd_device *obd = exp->exp_obd;
 160         struct lmv_obd *lmv = &obd->u.lmv;
 161         struct ptlrpc_request *req = NULL;
 162         struct mdt_body *body;
 163         struct md_op_data *op_data;
 164         int i;
 165         int valid_stripe_count = 0;
 166         int rc = 0;
 167
 168         ENTRY;
 169
 170         /**
 171          * revalidate slaves has some problems, temporarily return,
 172          * we may not need that
 173          */
 174         OBD_ALLOC_PTR(op_data);
 175         if (op_data == NULL)
 176                 RETURN(-ENOMEM);
 177
 178         /**
 179          * Loop over the stripe information, check validity and update them
 180          * from MDS if needed.
 181          */
 182         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
 183                 struct lu_fid           fid;
 184                 struct lookup_intent    it = { .it_op = IT_GETATTR };
 185                 struct lustre_handle    *lockh = NULL;
 186                 struct lmv_tgt_desc     *tgt = NULL;
 187                 struct inode            *inode;
 188
 189                 fid = lsm->lsm_md_oinfo[i].lmo_fid;
 190                 inode = lsm->lsm_md_oinfo[i].lmo_root;
 191
 192                 if (!inode)
 193                         continue;
 194
 195                 /*
 196                  * Prepare op_data for revalidating. Note that @fid2 shluld be
 197                  * defined otherwise it will go to server and take new lock
 198                  * which is not needed here.
 199                  */
 200                 memset(op_data, 0, sizeof(*op_data));
 201                 op_data->op_fid1 = fid;
 202                 op_data->op_fid2 = fid;
 203
 204                 tgt = lmv_get_target(lmv, lsm->lsm_md_oinfo[i].lmo_mds, NULL);
 205                 if (IS_ERR(tgt))
 206                         GOTO(cleanup, rc = PTR_ERR(tgt));
 207
 208                 CDEBUG(D_INODE, "Revalidate slave "DFID" -> mds #%u\n",
 209                        PFID(&fid), tgt->ltd_index);
 210
 211                 if (req != NULL) {
 212                         ptlrpc_req_finished(req);
 213                         req = NULL;
 214                 }
 215
 216                 rc = md_intent_lock(tgt->ltd_exp, op_data, &it, &req,
 217                                     cb_blocking, extra_lock_flags);
 218                 if (rc == -ENOENT) {
 219                         /* skip stripe is not exists */
 220                         rc = 0;
 221                         continue;
 222                 }
 223
 224                 if (rc < 0)
 225                         GOTO(cleanup, rc);
 226
 227                 lockh = (struct lustre_handle *)&it.it_lock_handle;
 228                 if (rc > 0 && req == NULL) {
 229                         /* slave inode is still valid */
 230                         CDEBUG(D_INODE, "slave "DFID" is still valid.\n",
 231                                PFID(&fid));
 232                         rc = 0;
 233                 } else {
 234                         /* refresh slave from server */
 235                         body = req_capsule_server_get(&req->rq_pill,
 236                                                       &RMF_MDT_BODY);
 237                         if (body == NULL) {
 238                                 if (it.it_lock_mode && lockh) {
 239                                         ldlm_lock_decref(lockh,
 240                                                  it.it_lock_mode);
 241                                         it.it_lock_mode = 0;
 242                                 }
 243                                 GOTO(cleanup, rc = -ENOENT);
 244                         }
 245
 246                         i_size_write(inode, body->mbo_size);
 247                         inode->i_blocks = body->mbo_blocks;
 248                         set_nlink(inode, body->mbo_nlink);
 249                         inode->i_atime.tv_sec = body->mbo_atime;
 250                         inode->i_ctime.tv_sec = body->mbo_ctime;
 251                         inode->i_mtime.tv_sec = body->mbo_mtime;
 252                 }
 253
 254                 md_set_lock_data(tgt->ltd_exp, lockh, inode, NULL);
 255                 if (it.it_lock_mode != 0 && lockh != NULL) {
 256                         ldlm_lock_decref(lockh, it.it_lock_mode);
 257                         it.it_lock_mode = 0;
 258                 }
 259
 260                 valid_stripe_count++;
 261         }
 262
 263 cleanup:
 264         if (req != NULL)
 265                 ptlrpc_req_finished(req);
 266
 267         /* if all stripes are invalid, return -ENOENT to notify user */
 268         if (!rc && !valid_stripe_count)
 269                 rc = -ENOENT;
 270
 271         OBD_FREE_PTR(op_data);
 272         RETURN(rc);
 273 }
 274
 275 /*
 276  * IT_OPEN is intended to open (and create, possible) an object. Parent (pid)
 277  * may be split dir.
 278  */
 279 static int lmv_intent_open(struct obd_export *exp, struct md_op_data *op_data,
 280                            struct lookup_intent *it,
 281                            struct ptlrpc_request **reqp,
 282                            ldlm_blocking_callback cb_blocking,
 283                            __u64 extra_lock_flags)
 284 {
 285         struct obd_device *obd = exp->exp_obd;
 286         struct lmv_obd *lmv = &obd->u.lmv;
 287         struct lmv_tgt_desc *tgt;
 288         struct mdt_body *body;
 289         __u64 flags = it->it_flags;
 290         int rc;
 291
 292         ENTRY;
 293
 294         /* do not allow file creation in foreign dir */
 295         if ((it->it_op & IT_CREAT) && lmv_dir_foreign(op_data->op_mea1))
 296                 RETURN(-ENODATA);
 297
 298         if ((it->it_op & IT_CREAT) && !(flags & MDS_OPEN_BY_FID)) {
 299                 /* don't allow create under dir with bad hash */
 300                 if (lmv_dir_bad_hash(op_data->op_mea1))
 301                         RETURN(-EBADF);
 302
 303                 if (lmv_dir_migrating(op_data->op_mea1)) {
 304                         if (flags & O_EXCL) {
 305                                 /*
 306                                  * open(O_CREAT | O_EXCL) needs to check
 307                                  * existing name, which should be done on both
 308                                  * old and new layout, to avoid creating new
 309                                  * file under old layout, check old layout on
 310                                  * client side.
 311                                  */
 312                                 tgt = lmv_locate_tgt(lmv, op_data);
 313                                 if (IS_ERR(tgt))
 314                                         RETURN(PTR_ERR(tgt));
 315
 316                                 rc = md_getattr_name(tgt->ltd_exp, op_data,
 317                                                      reqp);
 318                                 if (!rc) {
 319                                         ptlrpc_req_finished(*reqp);
 320                                         *reqp = NULL;
 321                                         RETURN(-EEXIST);
 322                                 }
 323
 324                                 if (rc != -ENOENT)
 325                                         RETURN(rc);
 326
 327                                 op_data->op_post_migrate = true;
 328                         } else {
 329                                 /*
 330                                  * open(O_CREAT) will be sent to MDT in old
 331                                  * layout first, to avoid creating new file
 332                                  * under old layout, clear O_CREAT.
 333                                  */
 334                                 it->it_flags &= ~O_CREAT;
 335                         }
 336                 }
 337         }
 338
 339 retry:
 340         if (it->it_flags & MDS_OPEN_BY_FID) {
 341                 LASSERT(fid_is_sane(&op_data->op_fid2));
 342
 343                 /* for striped directory, we can't know parent stripe fid
 344                  * without name, but we can set it to child fid, and MDT
 345                  * will obtain it from linkea in open in such case. */
 346                 if (lmv_dir_striped(op_data->op_mea1))
 347                         op_data->op_fid1 = op_data->op_fid2;
 348
 349                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
 350                 if (IS_ERR(tgt))
 351                         RETURN(PTR_ERR(tgt));
 352
 353                 op_data->op_mds = tgt->ltd_index;
 354         } else {
 355                 LASSERT(fid_is_sane(&op_data->op_fid1));
 356                 LASSERT(it->it_flags & MDS_OPEN_PCC ||
 357                         fid_is_zero(&op_data->op_fid2));
 358                 LASSERT(op_data->op_name != NULL);
 359
 360                 tgt = lmv_locate_tgt(lmv, op_data);
 361                 if (IS_ERR(tgt))
 362                         RETURN(PTR_ERR(tgt));
 363         }
 364
 365         /* If it is ready to open the file by FID, do not need
 366          * allocate FID at all, otherwise it will confuse MDT */
 367         if ((it->it_op & IT_CREAT) && !(it->it_flags & MDS_OPEN_BY_FID ||
 368                                         it->it_flags & MDS_OPEN_PCC)) {
 369                 /*
 370                  * For lookup(IT_CREATE) cases allocate new fid and setup FLD
 371                  * for it.
 372                  */
 373                 rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
 374                 if (rc != 0)
 375                         RETURN(rc);
 376         }
 377
 378         CDEBUG(D_INODE, "OPEN_INTENT with fid1="DFID", fid2="DFID","
 379                " name='%s' -> mds #%u\n", PFID(&op_data->op_fid1),
 380                PFID(&op_data->op_fid2), op_data->op_name, tgt->ltd_index);
 381
 382         rc = md_intent_lock(tgt->ltd_exp, op_data, it, reqp, cb_blocking,
 383                             extra_lock_flags);
 384         if (rc != 0)
 385                 RETURN(rc);
 386         /*
 387          * Nothing is found, do not access body->fid1 as it is zero and thus
 388          * pointless.
 389          */
 390         if ((it->it_disposition & DISP_LOOKUP_NEG) &&
 391             !(it->it_disposition & DISP_OPEN_CREATE) &&
 392             !(it->it_disposition & DISP_OPEN_OPEN)) {
 393                 if (!(it->it_flags & MDS_OPEN_BY_FID) &&
 394                     lmv_dir_retry_check_update(op_data)) {
 395                         ptlrpc_req_finished(*reqp);
 396                         it->it_request = NULL;
 397                         it->it_disposition = 0;
 398                         *reqp = NULL;
 399
 400                         it->it_flags = flags;
 401                         fid_zero(&op_data->op_fid2);
 402                         goto retry;
 403                 }
 404
 405                 RETURN(rc);
 406         }
 407
 408         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 409         if (body == NULL)
 410                 RETURN(-EPROTO);
 411
 412         /* Not cross-ref case, just get out of here. */
 413         if (unlikely((body->mbo_valid & OBD_MD_MDS))) {
 414                 rc = lmv_intent_remote(exp, it, &op_data->op_fid1, reqp,
 415                                        cb_blocking, extra_lock_flags,
 416                                        op_data->op_file_secctx_name,
 417                                        op_data->op_file_secctx_name_size);
 418                 if (rc != 0)
 419                         RETURN(rc);
 420
 421                 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 422                 if (body == NULL)
 423                         RETURN(-EPROTO);
 424         }
 425
 426         RETURN(rc);
 427 }
 428
 429 /*
 430  * Handler for: getattr, lookup and revalidate cases.
 431  */
 432 static int
 433 lmv_intent_lookup(struct obd_export *exp, struct md_op_data *op_data,
 434                   struct lookup_intent *it, struct ptlrpc_request **reqp,
 435                   ldlm_blocking_callback cb_blocking,
 436                   __u64 extra_lock_flags)
 437 {
 438         struct obd_device *obd = exp->exp_obd;
 439         struct lmv_obd *lmv = &obd->u.lmv;
 440         struct lmv_tgt_desc *tgt = NULL;
 441         struct mdt_body *body;
 442         int rc;
 443         ENTRY;
 444
 445         /* foreign dir is not striped */
 446         if (lmv_dir_foreign(op_data->op_mea1)) {
 447                 /* only allow getattr/lookup for itself */
 448                 if (op_data->op_name != NULL)
 449                         RETURN(-ENODATA);
 450                 RETURN(0);
 451         }
 452
 453 retry:
 454         tgt = lmv_locate_tgt(lmv, op_data);
 455         if (IS_ERR(tgt))
 456                 RETURN(PTR_ERR(tgt));
 457
 458         if (!fid_is_sane(&op_data->op_fid2))
 459                 fid_zero(&op_data->op_fid2);
 460
 461         CDEBUG(D_INODE, "LOOKUP_INTENT with fid1="DFID", fid2="DFID
 462                ", name='%s' -> mds #%u\n",
 463                PFID(&op_data->op_fid1), PFID(&op_data->op_fid2),
 464                op_data->op_name ? op_data->op_name : "<NULL>",
 465                tgt->ltd_index);
 466
 467         op_data->op_bias &= ~MDS_CROSS_REF;
 468
 469         rc = md_intent_lock(tgt->ltd_exp, op_data, it, reqp, cb_blocking,
 470                             extra_lock_flags);
 471         if (rc < 0)
 472                 RETURN(rc);
 473
 474         if (*reqp == NULL) {
 475                 /* If RPC happens, lsm information will be revalidated
 476                  * during update_inode process (see ll_update_lsm_md) */
 477                 if (lmv_dir_striped(op_data->op_mea2)) {
 478                         rc = lmv_revalidate_slaves(exp, op_data->op_mea2,
 479                                                    cb_blocking,
 480                                                    extra_lock_flags);
 481                         if (rc != 0)
 482                                 RETURN(rc);
 483                 }
 484                 RETURN(rc);
 485         } else if (it_disposition(it, DISP_LOOKUP_NEG) &&
 486                    lmv_dir_retry_check_update(op_data)) {
 487                 ptlrpc_req_finished(*reqp);
 488                 it->it_request = NULL;
 489                 it->it_disposition = 0;
 490                 *reqp = NULL;
 491
 492                 goto retry;
 493         }
 494
 495         if (!it_has_reply_body(it))
 496                 RETURN(0);
 497
 498         /*
 499          * MDS has returned success. Probably name has been resolved in
 500          * remote inode. Let's check this.
 501          */
 502         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 503         if (body == NULL)
 504                 RETURN(-EPROTO);
 505
 506         /* Not cross-ref case, just get out of here. */
 507         if (unlikely((body->mbo_valid & OBD_MD_MDS))) {
 508                 rc = lmv_intent_remote(exp, it, NULL, reqp, cb_blocking,
 509                                        extra_lock_flags,
 510                                        op_data->op_file_secctx_name,
 511                                        op_data->op_file_secctx_name_size);
 512                 if (rc != 0)
 513                         RETURN(rc);
 514                 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 515                 if (body == NULL)
 516                         RETURN(-EPROTO);
 517         }
 518
 519         RETURN(rc);
 520 }
 521
 522 int lmv_intent_lock(struct obd_export *exp, struct md_op_data *op_data,
 523                     struct lookup_intent *it, struct ptlrpc_request **reqp,
 524                     ldlm_blocking_callback cb_blocking,
 525                     __u64 extra_lock_flags)
 526 {
 527         int rc;
 528         ENTRY;
 529
 530         LASSERT(it != NULL);
 531         LASSERT(fid_is_sane(&op_data->op_fid1));
 532
 533         CDEBUG(D_INODE, "INTENT LOCK '%s' for "DFID" '%.*s' on "DFID"\n",
 534                 LL_IT2STR(it), PFID(&op_data->op_fid2),
 535                 (int)op_data->op_namelen, op_data->op_name,
 536                 PFID(&op_data->op_fid1));
 537
 538         if (it->it_op & (IT_LOOKUP | IT_GETATTR | IT_LAYOUT | IT_GETXATTR))
 539                 rc = lmv_intent_lookup(exp, op_data, it, reqp, cb_blocking,
 540                                        extra_lock_flags);
 541         else if (it->it_op & IT_OPEN)
 542                 rc = lmv_intent_open(exp, op_data, it, reqp, cb_blocking,
 543                                      extra_lock_flags);
 544         else
 545                 LBUG();
 546
 547         if (rc < 0) {
 548                 struct lustre_handle lock_handle;
 549
 550                 if (it->it_lock_mode != 0) {
 551                         lock_handle.cookie = it->it_lock_handle;
 552                         ldlm_lock_decref_and_cancel(&lock_handle,
 553                                                     it->it_lock_mode);
 554                 }
 555
 556                 it->it_lock_handle = 0;
 557                 it->it_lock_mode = 0;
 558
 559                 if (it->it_remote_lock_mode != 0) {
 560                         lock_handle.cookie = it->it_remote_lock_handle;
 561                         ldlm_lock_decref_and_cancel(&lock_handle,
 562                                                     it->it_remote_lock_mode);
 563                 }
 564
 565                 it->it_remote_lock_handle = 0;
 566                 it->it_remote_lock_mode = 0;
 567         }
 568
 569         RETURN(rc);
 570 }