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  */
  31
  32 #define DEBUG_SUBSYSTEM S_LMV
  33 #include <linux/slab.h>
  34 #include <linux/module.h>
  35 #include <linux/init.h>
  36 #include <linux/slab.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/math64.h>
  39 #include <linux/seq_file.h>
  40 #include <linux/namei.h>
  41 #include <lustre_intent.h>
  42
  43 #include <obd_support.h>
  44 #include <lustre_lib.h>
  45 #include <lustre_net.h>
  46 #include <lustre_dlm.h>
  47 #include <lustre_mdc.h>
  48 #include <obd_class.h>
  49 #include <lprocfs_status.h>
  50 #include "lmv_internal.h"
  51
  52 static int lmv_intent_remote(struct obd_export *exp, struct lookup_intent *it,
  53                              const struct lu_fid *parent_fid,
  54                              struct ptlrpc_request **reqp,
  55                              ldlm_blocking_callback cb_blocking,
  56                              __u64 extra_lock_flags,
  57                              const char *secctx_name, __u32 secctx_name_size)
  58 {
  59         struct obd_device       *obd = exp->exp_obd;
  60         struct lmv_obd          *lmv = &obd->u.lmv;
  61         struct ptlrpc_request   *req = NULL;
  62         struct lustre_handle    plock;
  63         struct md_op_data       *op_data;
  64         struct lmv_tgt_desc     *tgt;
  65         struct mdt_body         *body;
  66         int                     pmode;
  67         int                     rc = 0;
  68         ENTRY;
  69
  70         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
  71         if (body == NULL)
  72                 RETURN(-EPROTO);
  73
  74         LASSERT((body->mbo_valid & OBD_MD_MDS));
  75
  76         /*
  77          * We got LOOKUP lock, but we really need attrs.
  78          */
  79         pmode = it->it_lock_mode;
  80         if (pmode) {
  81                 plock.cookie = it->it_lock_handle;
  82                 it->it_lock_mode = 0;
  83                 it->it_request = NULL;
  84         }
  85
  86         LASSERT(fid_is_sane(&body->mbo_fid1));
  87
  88         tgt = lmv_fid2tgt(lmv, &body->mbo_fid1);
  89         if (IS_ERR(tgt))
  90                 GOTO(out, rc = PTR_ERR(tgt));
  91
  92         OBD_ALLOC_PTR(op_data);
  93         if (op_data == NULL)
  94                 GOTO(out, rc = -ENOMEM);
  95
  96         op_data->op_fid1 = body->mbo_fid1;
  97         /* Sent the parent FID to the remote MDT */
  98         if (parent_fid != NULL) {
  99                 /* The parent fid is only for remote open to
 100                  * check whether the open is from OBF,
 101                  * see mdt_cross_open */
 102                 LASSERT(it->it_op & IT_OPEN);
 103                 op_data->op_fid2 = *parent_fid;
 104         }
 105
 106         op_data->op_bias = MDS_CROSS_REF;
 107         op_data->op_cli_flags = CLI_NO_SLOT;
 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                 /* shard revalidate only needs to fetch attributes and UPDATE
 204                  * lock, which is similar to the bottom half of remote object
 205                  * getattr, set this flag so that MDT skips checking whether
 206                  * it's remote object.
 207                  */
 208                 op_data->op_bias = MDS_CROSS_REF;
 209                 op_data->op_cli_flags = CLI_NO_SLOT;
 210
 211                 tgt = lmv_tgt(lmv, lsm->lsm_md_oinfo[i].lmo_mds);
 212                 if (!tgt)
 213                         GOTO(cleanup, rc = -ENODEV);
 214
 215                 CDEBUG(D_INODE, "Revalidate slave "DFID" -> mds #%u\n",
 216                        PFID(&fid), tgt->ltd_index);
 217
 218                 if (req != NULL) {
 219                         ptlrpc_req_finished(req);
 220                         req = NULL;
 221                 }
 222
 223                 rc = md_intent_lock(tgt->ltd_exp, op_data, &it, &req,
 224                                     cb_blocking, extra_lock_flags);
 225                 if (rc == -ENOENT || rc == -ESHUTDOWN) {
 226                         /* skip stripe that doesn't exist or is inaccessible */
 227                         rc = 0;
 228                         continue;
 229                 }
 230
 231                 if (rc < 0)
 232                         GOTO(cleanup, rc);
 233
 234                 lockh = (struct lustre_handle *)&it.it_lock_handle;
 235                 if (rc > 0 && req == NULL) {
 236                         /* slave inode is still valid */
 237                         CDEBUG(D_INODE, "slave "DFID" is still valid.\n",
 238                                PFID(&fid));
 239                         rc = 0;
 240                 } else {
 241                         /* refresh slave from server */
 242                         body = req_capsule_server_get(&req->rq_pill,
 243                                                       &RMF_MDT_BODY);
 244                         if (body == NULL) {
 245                                 if (it.it_lock_mode && lockh) {
 246                                         ldlm_lock_decref(lockh,
 247                                                  it.it_lock_mode);
 248                                         it.it_lock_mode = 0;
 249                                 }
 250                                 GOTO(cleanup, rc = -ENOENT);
 251                         }
 252
 253                         i_size_write(inode, body->mbo_size);
 254                         inode->i_blocks = body->mbo_blocks;
 255                         spin_lock(&inode->i_lock);
 256                         set_nlink(inode, body->mbo_nlink);
 257                         spin_unlock(&inode->i_lock);
 258                         inode->i_atime.tv_sec = body->mbo_atime;
 259                         inode->i_ctime.tv_sec = body->mbo_ctime;
 260                         inode->i_mtime.tv_sec = body->mbo_mtime;
 261                 }
 262
 263                 md_set_lock_data(tgt->ltd_exp, lockh, inode, NULL);
 264                 if (it.it_lock_mode != 0 && lockh != NULL) {
 265                         ldlm_lock_decref(lockh, it.it_lock_mode);
 266                         it.it_lock_mode = 0;
 267                 }
 268
 269                 valid_stripe_count++;
 270         }
 271
 272 cleanup:
 273         if (req != NULL)
 274                 ptlrpc_req_finished(req);
 275
 276         /* if all stripes are invalid, return -ENOENT to notify user */
 277         if (!rc && !valid_stripe_count)
 278                 rc = -ENOENT;
 279
 280         OBD_FREE_PTR(op_data);
 281         RETURN(rc);
 282 }
 283
 284 /*
 285  * IT_OPEN is intended to open (and create, possible) an object. Parent (pid)
 286  * may be split dir.
 287  */
 288 static int lmv_intent_open(struct obd_export *exp, struct md_op_data *op_data,
 289                            struct lookup_intent *it,
 290                            struct ptlrpc_request **reqp,
 291                            ldlm_blocking_callback cb_blocking,
 292                            __u64 extra_lock_flags)
 293 {
 294         struct obd_device *obd = exp->exp_obd;
 295         struct lmv_obd *lmv = &obd->u.lmv;
 296         struct lmv_tgt_desc *tgt;
 297         struct mdt_body *body;
 298         __u64 flags = it->it_flags;
 299         int rc;
 300
 301         ENTRY;
 302
 303         /* do not allow file creation in foreign dir */
 304         if ((it->it_op & IT_CREAT) && lmv_dir_foreign(op_data->op_mea1))
 305                 RETURN(-ENODATA);
 306
 307         if ((it->it_op & IT_CREAT) && !(flags & MDS_OPEN_BY_FID)) {
 308                 /* don't allow create under dir with bad hash */
 309                 if (lmv_dir_bad_hash(op_data->op_mea1))
 310                         RETURN(-EBADF);
 311
 312                 if (lmv_dir_layout_changing(op_data->op_mea1)) {
 313                         if (flags & O_EXCL) {
 314                                 /*
 315                                  * open(O_CREAT | O_EXCL) needs to check
 316                                  * existing name, which should be done on both
 317                                  * old and new layout, check old layout on
 318                                  * client side.
 319                                  */
 320                                 rc = lmv_old_layout_lookup(lmv, op_data);
 321                                 if (rc != -ENOENT)
 322                                         RETURN(rc);
 323
 324                                 op_data->op_new_layout = true;
 325                         } else {
 326                                 /*
 327                                  * open(O_CREAT) will be sent to MDT in old
 328                                  * layout first, to avoid creating new file
 329                                  * under old layout, clear O_CREAT.
 330                                  */
 331                                 it->it_flags &= ~O_CREAT;
 332                         }
 333                 }
 334         }
 335
 336 retry:
 337         if (it->it_flags & MDS_OPEN_BY_FID) {
 338                 LASSERT(fid_is_sane(&op_data->op_fid2));
 339
 340                 /* for striped directory, we can't know parent stripe fid
 341                  * without name, but we can set it to child fid, and MDT
 342                  * will obtain it from linkea in open in such case. */
 343                 if (lmv_dir_striped(op_data->op_mea1))
 344                         op_data->op_fid1 = op_data->op_fid2;
 345
 346                 tgt = lmv_fid2tgt(lmv, &op_data->op_fid2);
 347                 if (IS_ERR(tgt))
 348                         RETURN(PTR_ERR(tgt));
 349
 350                 op_data->op_mds = tgt->ltd_index;
 351         } else {
 352                 LASSERT(fid_is_sane(&op_data->op_fid1));
 353                 LASSERT(fid_is_zero(&op_data->op_fid2));
 354                 LASSERT(op_data->op_name != NULL);
 355
 356                 tgt = lmv_locate_tgt(lmv, op_data);
 357                 if (IS_ERR(tgt))
 358                         RETURN(PTR_ERR(tgt));
 359         }
 360
 361         /* If it is ready to open the file by FID, do not need
 362          * allocate FID at all, otherwise it will confuse MDT */
 363         if ((it->it_op & IT_CREAT) && !(it->it_flags & MDS_OPEN_BY_FID)) {
 364                 /*
 365                  * For lookup(IT_CREATE) cases allocate new fid and setup FLD
 366                  * for it.
 367                  */
 368                 rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
 369                 if (rc != 0)
 370                         RETURN(rc);
 371         }
 372
 373         CDEBUG(D_INODE, "OPEN_INTENT with fid1="DFID", fid2="DFID","
 374                " name='%s' -> mds #%u\n", PFID(&op_data->op_fid1),
 375                PFID(&op_data->op_fid2), op_data->op_name, tgt->ltd_index);
 376
 377         rc = md_intent_lock(tgt->ltd_exp, op_data, it, reqp, cb_blocking,
 378                             extra_lock_flags);
 379         if (rc != 0)
 380                 RETURN(rc);
 381         /*
 382          * Nothing is found, do not access body->fid1 as it is zero and thus
 383          * pointless.
 384          */
 385         if ((it->it_disposition & DISP_LOOKUP_NEG) &&
 386             !(it->it_disposition & DISP_OPEN_CREATE) &&
 387             !(it->it_disposition & DISP_OPEN_OPEN)) {
 388                 if (!(it->it_flags & MDS_OPEN_BY_FID) &&
 389                     lmv_dir_retry_check_update(op_data)) {
 390                         ptlrpc_req_finished(*reqp);
 391                         it->it_request = NULL;
 392                         it->it_disposition = 0;
 393                         *reqp = NULL;
 394
 395                         it->it_flags = flags;
 396                         fid_zero(&op_data->op_fid2);
 397                         goto retry;
 398                 }
 399
 400                 RETURN(rc);
 401         }
 402
 403         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 404         if (body == NULL)
 405                 RETURN(-EPROTO);
 406
 407         /* Not cross-ref case, just get out of here. */
 408         if (unlikely((body->mbo_valid & OBD_MD_MDS))) {
 409                 rc = lmv_intent_remote(exp, it, &op_data->op_fid1, reqp,
 410                                        cb_blocking, extra_lock_flags,
 411                                        op_data->op_file_secctx_name,
 412                                        op_data->op_file_secctx_name_size);
 413                 if (rc != 0)
 414                         RETURN(rc);
 415
 416                 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 417                 if (body == NULL)
 418                         RETURN(-EPROTO);
 419         }
 420
 421         RETURN(rc);
 422 }
 423
 424 /*
 425  * Handler for: getattr, lookup and revalidate cases.
 426  */
 427 static int
 428 lmv_intent_lookup(struct obd_export *exp, struct md_op_data *op_data,
 429                   struct lookup_intent *it, struct ptlrpc_request **reqp,
 430                   ldlm_blocking_callback cb_blocking,
 431                   __u64 extra_lock_flags)
 432 {
 433         struct obd_device *obd = exp->exp_obd;
 434         struct lmv_obd *lmv = &obd->u.lmv;
 435         struct lmv_tgt_desc *tgt = NULL;
 436         struct mdt_body *body;
 437         int rc;
 438         ENTRY;
 439
 440         /* foreign dir is not striped */
 441         if (lmv_dir_foreign(op_data->op_mea1)) {
 442                 /* only allow getattr/lookup for itself */
 443                 if (op_data->op_name != NULL)
 444                         RETURN(-ENODATA);
 445                 RETURN(0);
 446         }
 447
 448 retry:
 449         if (op_data->op_flags & MF_GETATTR_BY_FID) {
 450                 /* getattr by FID, replace fid1 with stripe FID,
 451                  * NB, don't replace if name is "/", because it may be a subtree
 452                  * mount, and if it's a striped directory, fid1 will be replaced
 453                  * to stripe FID by hash, while fid2 is master object FID, which
 454                  * will be treated as a remote object if the two FIDs are
 455                  * located on different MDTs, and LOOKUP lock can't be fetched.
 456                  */
 457                 LASSERT(op_data->op_name);
 458                 if (op_data->op_namelen != 1 ||
 459                     strncmp(op_data->op_name, "/", 1) != 0) {
 460                         tgt = lmv_locate_tgt(lmv, op_data);
 461                         if (IS_ERR(tgt))
 462                                 RETURN(PTR_ERR(tgt));
 463                 }
 464
 465                 /* name is used to locate stripe target, clear it here
 466                  * to avoid packing name in request, so that MDS knows
 467                  * it's getattr by FID.
 468                  */
 469                 op_data->op_name = NULL;
 470                 op_data->op_namelen = 0;
 471
 472                 /* getattr request is sent to MDT where fid2 inode is */
 473                 tgt = lmv_fid2tgt(lmv, &op_data->op_fid2);
 474         } else if (op_data->op_name) {
 475                 /* getattr by name */
 476                 tgt = lmv_locate_tgt(lmv, op_data);
 477                 if (!fid_is_sane(&op_data->op_fid2))
 478                         fid_zero(&op_data->op_fid2);
 479         } else {
 480                 /* old way to getattr by FID, parent FID not packed */
 481                 tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
 482         }
 483         if (IS_ERR(tgt))
 484                 RETURN(PTR_ERR(tgt));
 485
 486         CDEBUG(D_INODE, "LOOKUP_INTENT with fid1="DFID", fid2="DFID
 487                ", name='%s' -> mds #%u\n",
 488                PFID(&op_data->op_fid1), PFID(&op_data->op_fid2),
 489                op_data->op_name ? op_data->op_name : "<NULL>",
 490                tgt->ltd_index);
 491
 492         op_data->op_bias &= ~MDS_CROSS_REF;
 493
 494         rc = md_intent_lock(tgt->ltd_exp, op_data, it, reqp, cb_blocking,
 495                             extra_lock_flags);
 496         if (rc < 0)
 497                 RETURN(rc);
 498
 499         if (*reqp == NULL) {
 500                 /* If RPC happens, lsm information will be revalidated
 501                  * during update_inode process (see ll_update_lsm_md) */
 502                 if (lmv_dir_striped(op_data->op_mea2)) {
 503                         rc = lmv_revalidate_slaves(exp, op_data->op_mea2,
 504                                                    cb_blocking,
 505                                                    extra_lock_flags);
 506                         if (rc != 0)
 507                                 RETURN(rc);
 508                 }
 509                 RETURN(rc);
 510         } else if (it_disposition(it, DISP_LOOKUP_NEG) &&
 511                    lmv_dir_retry_check_update(op_data)) {
 512                 ptlrpc_req_finished(*reqp);
 513                 it->it_request = NULL;
 514                 it->it_disposition = 0;
 515                 *reqp = NULL;
 516
 517                 goto retry;
 518         }
 519
 520         if (!it_has_reply_body(it))
 521                 RETURN(0);
 522
 523         /*
 524          * MDS has returned success. Probably name has been resolved in
 525          * remote inode. Let's check this.
 526          */
 527         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 528         if (body == NULL)
 529                 RETURN(-EPROTO);
 530
 531         /* Not cross-ref case, just get out of here. */
 532         if (unlikely((body->mbo_valid & OBD_MD_MDS))) {
 533                 rc = lmv_intent_remote(exp, it, NULL, reqp, cb_blocking,
 534                                        extra_lock_flags,
 535                                        op_data->op_file_secctx_name,
 536                                        op_data->op_file_secctx_name_size);
 537                 if (rc != 0)
 538                         RETURN(rc);
 539                 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 540                 if (body == NULL)
 541                         RETURN(-EPROTO);
 542         }
 543
 544         RETURN(rc);
 545 }
 546
 547 int lmv_intent_lock(struct obd_export *exp, struct md_op_data *op_data,
 548                     struct lookup_intent *it, struct ptlrpc_request **reqp,
 549                     ldlm_blocking_callback cb_blocking,
 550                     __u64 extra_lock_flags)
 551 {
 552         int rc;
 553         ENTRY;
 554
 555         LASSERT(it != NULL);
 556         LASSERT(fid_is_sane(&op_data->op_fid1));
 557
 558         CDEBUG(D_INODE, "INTENT LOCK '%s' for "DFID" '%.*s' on "DFID"\n",
 559                 LL_IT2STR(it), PFID(&op_data->op_fid2),
 560                 (int)op_data->op_namelen, op_data->op_name,
 561                 PFID(&op_data->op_fid1));
 562
 563         if (it->it_op & (IT_LOOKUP | IT_GETATTR | IT_LAYOUT | IT_GETXATTR))
 564                 rc = lmv_intent_lookup(exp, op_data, it, reqp, cb_blocking,
 565                                        extra_lock_flags);
 566         else if (it->it_op & IT_OPEN)
 567                 rc = lmv_intent_open(exp, op_data, it, reqp, cb_blocking,
 568                                      extra_lock_flags);
 569         else
 570                 LBUG();
 571
 572         if (rc < 0) {
 573                 struct lustre_handle lock_handle;
 574
 575                 if (it->it_lock_mode != 0) {
 576                         lock_handle.cookie = it->it_lock_handle;
 577                         ldlm_lock_decref_and_cancel(&lock_handle,
 578                                                     it->it_lock_mode);
 579                 }
 580
 581                 it->it_lock_handle = 0;
 582                 it->it_lock_mode = 0;
 583
 584                 if (it->it_remote_lock_mode != 0) {
 585                         lock_handle.cookie = it->it_remote_lock_handle;
 586                         ldlm_lock_decref_and_cancel(&lock_handle,
 587                                                     it->it_remote_lock_mode);
 588                 }
 589
 590                 it->it_remote_lock_handle = 0;
 591                 it->it_remote_lock_mode = 0;
 592         }
 593
 594         RETURN(rc);
 595 }