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         CDEBUG(D_INODE, "REMOTE_INTENT with fid="DFID" -> mds #%u\n",
 108                PFID(&body->mbo_fid1), tgt->ltd_index);
 109
 110         /* ask for security context upon intent */
 111         if (it->it_op & (IT_LOOKUP | IT_GETATTR | IT_OPEN) &&
 112             secctx_name_size != 0 && secctx_name != NULL) {
 113                 op_data->op_file_secctx_name = secctx_name;
 114                 op_data->op_file_secctx_name_size = secctx_name_size;
 115                 CDEBUG(D_SEC, "'%.*s' is security xattr to fetch for "
 116                        DFID"\n",
 117                        secctx_name_size, secctx_name, PFID(&body->mbo_fid1));
 118         }
 119
 120         rc = md_intent_lock(tgt->ltd_exp, op_data, it, &req, cb_blocking,
 121                             extra_lock_flags);
 122         if (rc)
 123                 GOTO(out_free_op_data, rc);
 124
 125         /*
 126          * LLite needs LOOKUP lock to track dentry revocation in order to
 127          * maintain dcache consistency. Thus drop UPDATE|PERM lock here
 128          * and put LOOKUP in request.
 129          */
 130         if (it->it_lock_mode != 0) {
 131                 it->it_remote_lock_handle =
 132                                         it->it_lock_handle;
 133                 it->it_remote_lock_mode = it->it_lock_mode;
 134         }
 135
 136         if (pmode) {
 137                 it->it_lock_handle = plock.cookie;
 138                 it->it_lock_mode = pmode;
 139         }
 140
 141         EXIT;
 142 out_free_op_data:
 143         OBD_FREE_PTR(op_data);
 144 out:
 145         if (rc && pmode)
 146                 ldlm_lock_decref(&plock, pmode);
 147
 148         ptlrpc_req_finished(*reqp);
 149         *reqp = req;
 150         return rc;
 151 }
 152
 153 int lmv_revalidate_slaves(struct obd_export *exp,
 154                           const struct lmv_stripe_md *lsm,
 155                           ldlm_blocking_callback cb_blocking,
 156                           int extra_lock_flags)
 157 {
 158         struct obd_device *obd = exp->exp_obd;
 159         struct lmv_obd *lmv = &obd->u.lmv;
 160         struct ptlrpc_request *req = NULL;
 161         struct mdt_body *body;
 162         struct md_op_data *op_data;
 163         int i;
 164         int valid_stripe_count = 0;
 165         int rc = 0;
 166
 167         ENTRY;
 168
 169         /**
 170          * revalidate slaves has some problems, temporarily return,
 171          * we may not need that
 172          */
 173         OBD_ALLOC_PTR(op_data);
 174         if (op_data == NULL)
 175                 RETURN(-ENOMEM);
 176
 177         /**
 178          * Loop over the stripe information, check validity and update them
 179          * from MDS if needed.
 180          */
 181         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
 182                 struct lu_fid           fid;
 183                 struct lookup_intent    it = { .it_op = IT_GETATTR };
 184                 struct lustre_handle    *lockh = NULL;
 185                 struct lmv_tgt_desc     *tgt = NULL;
 186                 struct inode            *inode;
 187
 188                 fid = lsm->lsm_md_oinfo[i].lmo_fid;
 189                 inode = lsm->lsm_md_oinfo[i].lmo_root;
 190
 191                 if (!inode)
 192                         continue;
 193
 194                 /*
 195                  * Prepare op_data for revalidating. Note that @fid2 shluld be
 196                  * defined otherwise it will go to server and take new lock
 197                  * which is not needed here.
 198                  */
 199                 memset(op_data, 0, sizeof(*op_data));
 200                 op_data->op_fid1 = fid;
 201                 op_data->op_fid2 = fid;
 202                 /* shard revalidate only needs to fetch attributes and UPDATE
 203                  * lock, which is similar to the bottom half of remote object
 204                  * getattr, set this flag so that MDT skips checking whether
 205                  * it's remote object.
 206                  */
 207                 op_data->op_bias = MDS_CROSS_REF;
 208
 209                 tgt = lmv_tgt(lmv, lsm->lsm_md_oinfo[i].lmo_mds);
 210                 if (!tgt)
 211                         GOTO(cleanup, rc = -ENODEV);
 212
 213                 CDEBUG(D_INODE, "Revalidate slave "DFID" -> mds #%u\n",
 214                        PFID(&fid), tgt->ltd_index);
 215
 216                 if (req != NULL) {
 217                         ptlrpc_req_finished(req);
 218                         req = NULL;
 219                 }
 220
 221                 rc = md_intent_lock(tgt->ltd_exp, op_data, &it, &req,
 222                                     cb_blocking, extra_lock_flags);
 223                 if (rc == -ENOENT) {
 224                         /* skip stripe is not exists */
 225                         rc = 0;
 226                         continue;
 227                 }
 228
 229                 if (rc < 0)
 230                         GOTO(cleanup, rc);
 231
 232                 lockh = (struct lustre_handle *)&it.it_lock_handle;
 233                 if (rc > 0 && req == NULL) {
 234                         /* slave inode is still valid */
 235                         CDEBUG(D_INODE, "slave "DFID" is still valid.\n",
 236                                PFID(&fid));
 237                         rc = 0;
 238                 } else {
 239                         /* refresh slave from server */
 240                         body = req_capsule_server_get(&req->rq_pill,
 241                                                       &RMF_MDT_BODY);
 242                         if (body == NULL) {
 243                                 if (it.it_lock_mode && lockh) {
 244                                         ldlm_lock_decref(lockh,
 245                                                  it.it_lock_mode);
 246                                         it.it_lock_mode = 0;
 247                                 }
 248                                 GOTO(cleanup, rc = -ENOENT);
 249                         }
 250
 251                         i_size_write(inode, body->mbo_size);
 252                         inode->i_blocks = body->mbo_blocks;
 253                         set_nlink(inode, body->mbo_nlink);
 254                         inode->i_atime.tv_sec = body->mbo_atime;
 255                         inode->i_ctime.tv_sec = body->mbo_ctime;
 256                         inode->i_mtime.tv_sec = body->mbo_mtime;
 257                 }
 258
 259                 md_set_lock_data(tgt->ltd_exp, lockh, inode, NULL);
 260                 if (it.it_lock_mode != 0 && lockh != NULL) {
 261                         ldlm_lock_decref(lockh, it.it_lock_mode);
 262                         it.it_lock_mode = 0;
 263                 }
 264
 265                 valid_stripe_count++;
 266         }
 267
 268 cleanup:
 269         if (req != NULL)
 270                 ptlrpc_req_finished(req);
 271
 272         /* if all stripes are invalid, return -ENOENT to notify user */
 273         if (!rc && !valid_stripe_count)
 274                 rc = -ENOENT;
 275
 276         OBD_FREE_PTR(op_data);
 277         RETURN(rc);
 278 }
 279
 280 /*
 281  * IT_OPEN is intended to open (and create, possible) an object. Parent (pid)
 282  * may be split dir.
 283  */
 284 static int lmv_intent_open(struct obd_export *exp, struct md_op_data *op_data,
 285                            struct lookup_intent *it,
 286                            struct ptlrpc_request **reqp,
 287                            ldlm_blocking_callback cb_blocking,
 288                            __u64 extra_lock_flags)
 289 {
 290         struct obd_device *obd = exp->exp_obd;
 291         struct lmv_obd *lmv = &obd->u.lmv;
 292         struct lmv_tgt_desc *tgt;
 293         struct mdt_body *body;
 294         __u64 flags = it->it_flags;
 295         int rc;
 296
 297         ENTRY;
 298
 299         /* do not allow file creation in foreign dir */
 300         if ((it->it_op & IT_CREAT) && lmv_dir_foreign(op_data->op_mea1))
 301                 RETURN(-ENODATA);
 302
 303         if ((it->it_op & IT_CREAT) && !(flags & MDS_OPEN_BY_FID)) {
 304                 /* don't allow create under dir with bad hash */
 305                 if (lmv_dir_bad_hash(op_data->op_mea1))
 306                         RETURN(-EBADF);
 307
 308                 if (lmv_dir_layout_changing(op_data->op_mea1)) {
 309                         if (flags & O_EXCL) {
 310                                 /*
 311                                  * open(O_CREAT | O_EXCL) needs to check
 312                                  * existing name, which should be done on both
 313                                  * old and new layout, check old layout on
 314                                  * client side.
 315                                  */
 316                                 rc = lmv_old_layout_lookup(lmv, op_data);
 317                                 if (rc != -ENOENT)
 318                                         RETURN(rc);
 319
 320                                 op_data->op_new_layout = true;
 321                         } else {
 322                                 /*
 323                                  * open(O_CREAT) will be sent to MDT in old
 324                                  * layout first, to avoid creating new file
 325                                  * under old layout, clear O_CREAT.
 326                                  */
 327                                 it->it_flags &= ~O_CREAT;
 328                         }
 329                 }
 330         }
 331
 332 retry:
 333         if (it->it_flags & MDS_OPEN_BY_FID) {
 334                 LASSERT(fid_is_sane(&op_data->op_fid2));
 335
 336                 /* for striped directory, we can't know parent stripe fid
 337                  * without name, but we can set it to child fid, and MDT
 338                  * will obtain it from linkea in open in such case. */
 339                 if (lmv_dir_striped(op_data->op_mea1))
 340                         op_data->op_fid1 = op_data->op_fid2;
 341
 342                 tgt = lmv_fid2tgt(lmv, &op_data->op_fid2);
 343                 if (IS_ERR(tgt))
 344                         RETURN(PTR_ERR(tgt));
 345
 346                 op_data->op_mds = tgt->ltd_index;
 347         } else {
 348                 LASSERT(fid_is_sane(&op_data->op_fid1));
 349                 LASSERT(fid_is_zero(&op_data->op_fid2));
 350                 LASSERT(op_data->op_name != NULL);
 351
 352                 tgt = lmv_locate_tgt(lmv, op_data);
 353                 if (IS_ERR(tgt))
 354                         RETURN(PTR_ERR(tgt));
 355         }
 356
 357         /* If it is ready to open the file by FID, do not need
 358          * allocate FID at all, otherwise it will confuse MDT */
 359         if ((it->it_op & IT_CREAT) && !(it->it_flags & MDS_OPEN_BY_FID)) {
 360                 /*
 361                  * For lookup(IT_CREATE) cases allocate new fid and setup FLD
 362                  * for it.
 363                  */
 364                 rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
 365                 if (rc != 0)
 366                         RETURN(rc);
 367         }
 368
 369         CDEBUG(D_INODE, "OPEN_INTENT with fid1="DFID", fid2="DFID","
 370                " name='%s' -> mds #%u\n", PFID(&op_data->op_fid1),
 371                PFID(&op_data->op_fid2), op_data->op_name, tgt->ltd_index);
 372
 373         rc = md_intent_lock(tgt->ltd_exp, op_data, it, reqp, cb_blocking,
 374                             extra_lock_flags);
 375         if (rc != 0)
 376                 RETURN(rc);
 377         /*
 378          * Nothing is found, do not access body->fid1 as it is zero and thus
 379          * pointless.
 380          */
 381         if ((it->it_disposition & DISP_LOOKUP_NEG) &&
 382             !(it->it_disposition & DISP_OPEN_CREATE) &&
 383             !(it->it_disposition & DISP_OPEN_OPEN)) {
 384                 if (!(it->it_flags & MDS_OPEN_BY_FID) &&
 385                     lmv_dir_retry_check_update(op_data)) {
 386                         ptlrpc_req_finished(*reqp);
 387                         it->it_request = NULL;
 388                         it->it_disposition = 0;
 389                         *reqp = NULL;
 390
 391                         it->it_flags = flags;
 392                         fid_zero(&op_data->op_fid2);
 393                         goto retry;
 394                 }
 395
 396                 RETURN(rc);
 397         }
 398
 399         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 400         if (body == NULL)
 401                 RETURN(-EPROTO);
 402
 403         /* Not cross-ref case, just get out of here. */
 404         if (unlikely((body->mbo_valid & OBD_MD_MDS))) {
 405                 rc = lmv_intent_remote(exp, it, &op_data->op_fid1, reqp,
 406                                        cb_blocking, extra_lock_flags,
 407                                        op_data->op_file_secctx_name,
 408                                        op_data->op_file_secctx_name_size);
 409                 if (rc != 0)
 410                         RETURN(rc);
 411
 412                 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 413                 if (body == NULL)
 414                         RETURN(-EPROTO);
 415         }
 416
 417         RETURN(rc);
 418 }
 419
 420 /*
 421  * Handler for: getattr, lookup and revalidate cases.
 422  */
 423 static int
 424 lmv_intent_lookup(struct obd_export *exp, struct md_op_data *op_data,
 425                   struct lookup_intent *it, struct ptlrpc_request **reqp,
 426                   ldlm_blocking_callback cb_blocking,
 427                   __u64 extra_lock_flags)
 428 {
 429         struct obd_device *obd = exp->exp_obd;
 430         struct lmv_obd *lmv = &obd->u.lmv;
 431         struct lmv_tgt_desc *tgt = NULL;
 432         struct mdt_body *body;
 433         int rc;
 434         ENTRY;
 435
 436         /* foreign dir is not striped */
 437         if (lmv_dir_foreign(op_data->op_mea1)) {
 438                 /* only allow getattr/lookup for itself */
 439                 if (op_data->op_name != NULL)
 440                         RETURN(-ENODATA);
 441                 RETURN(0);
 442         }
 443
 444 retry:
 445         if (op_data->op_flags & MF_GETATTR_BY_FID) {
 446                 /* getattr by FID, replace fid1 with stripe FID,
 447                  * NB, don't replace if name is "/", because it may be a subtree
 448                  * mount, and if it's a striped directory, fid1 will be replaced
 449                  * to stripe FID by hash, while fid2 is master object FID, which
 450                  * will be treated as a remote object if the two FIDs are
 451                  * located on different MDTs, and LOOKUP lock can't be fetched.
 452                  */
 453                 LASSERT(op_data->op_name);
 454                 if (op_data->op_namelen != 1 ||
 455                     strncmp(op_data->op_name, "/", 1) != 0) {
 456                         tgt = lmv_locate_tgt(lmv, op_data);
 457                         if (IS_ERR(tgt))
 458                                 RETURN(PTR_ERR(tgt));
 459                 }
 460
 461                 /* name is used to locate stripe target, clear it here
 462                  * to avoid packing name in request, so that MDS knows
 463                  * it's getattr by FID.
 464                  */
 465                 op_data->op_name = NULL;
 466                 op_data->op_namelen = 0;
 467
 468                 /* getattr request is sent to MDT where fid2 inode is */
 469                 tgt = lmv_fid2tgt(lmv, &op_data->op_fid2);
 470         } else if (op_data->op_name) {
 471                 /* getattr by name */
 472                 tgt = lmv_locate_tgt(lmv, op_data);
 473                 if (!fid_is_sane(&op_data->op_fid2))
 474                         fid_zero(&op_data->op_fid2);
 475         } else {
 476                 /* old way to getattr by FID, parent FID not packed */
 477                 tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
 478         }
 479         if (IS_ERR(tgt))
 480                 RETURN(PTR_ERR(tgt));
 481
 482         CDEBUG(D_INODE, "LOOKUP_INTENT with fid1="DFID", fid2="DFID
 483                ", name='%s' -> mds #%u\n",
 484                PFID(&op_data->op_fid1), PFID(&op_data->op_fid2),
 485                op_data->op_name ? op_data->op_name : "<NULL>",
 486                tgt->ltd_index);
 487
 488         op_data->op_bias &= ~MDS_CROSS_REF;
 489
 490         rc = md_intent_lock(tgt->ltd_exp, op_data, it, reqp, cb_blocking,
 491                             extra_lock_flags);
 492         if (rc < 0)
 493                 RETURN(rc);
 494
 495         if (*reqp == NULL) {
 496                 /* If RPC happens, lsm information will be revalidated
 497                  * during update_inode process (see ll_update_lsm_md) */
 498                 if (lmv_dir_striped(op_data->op_mea2)) {
 499                         rc = lmv_revalidate_slaves(exp, op_data->op_mea2,
 500                                                    cb_blocking,
 501                                                    extra_lock_flags);
 502                         if (rc != 0)
 503                                 RETURN(rc);
 504                 }
 505                 RETURN(rc);
 506         } else if (it_disposition(it, DISP_LOOKUP_NEG) &&
 507                    lmv_dir_retry_check_update(op_data)) {
 508                 ptlrpc_req_finished(*reqp);
 509                 it->it_request = NULL;
 510                 it->it_disposition = 0;
 511                 *reqp = NULL;
 512
 513                 goto retry;
 514         }
 515
 516         if (!it_has_reply_body(it))
 517                 RETURN(0);
 518
 519         /*
 520          * MDS has returned success. Probably name has been resolved in
 521          * remote inode. Let's check this.
 522          */
 523         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 524         if (body == NULL)
 525                 RETURN(-EPROTO);
 526
 527         /* Not cross-ref case, just get out of here. */
 528         if (unlikely((body->mbo_valid & OBD_MD_MDS))) {
 529                 rc = lmv_intent_remote(exp, it, NULL, reqp, cb_blocking,
 530                                        extra_lock_flags,
 531                                        op_data->op_file_secctx_name,
 532                                        op_data->op_file_secctx_name_size);
 533                 if (rc != 0)
 534                         RETURN(rc);
 535                 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 536                 if (body == NULL)
 537                         RETURN(-EPROTO);
 538         }
 539
 540         RETURN(rc);
 541 }
 542
 543 int lmv_intent_lock(struct obd_export *exp, struct md_op_data *op_data,
 544                     struct lookup_intent *it, struct ptlrpc_request **reqp,
 545                     ldlm_blocking_callback cb_blocking,
 546                     __u64 extra_lock_flags)
 547 {
 548         int rc;
 549         ENTRY;
 550
 551         LASSERT(it != NULL);
 552         LASSERT(fid_is_sane(&op_data->op_fid1));
 553
 554         CDEBUG(D_INODE, "INTENT LOCK '%s' for "DFID" '%.*s' on "DFID"\n",
 555                 LL_IT2STR(it), PFID(&op_data->op_fid2),
 556                 (int)op_data->op_namelen, op_data->op_name,
 557                 PFID(&op_data->op_fid1));
 558
 559         if (it->it_op & (IT_LOOKUP | IT_GETATTR | IT_LAYOUT | IT_GETXATTR))
 560                 rc = lmv_intent_lookup(exp, op_data, it, reqp, cb_blocking,
 561                                        extra_lock_flags);
 562         else if (it->it_op & IT_OPEN)
 563                 rc = lmv_intent_open(exp, op_data, it, reqp, cb_blocking,
 564                                      extra_lock_flags);
 565         else
 566                 LBUG();
 567
 568         if (rc < 0) {
 569                 struct lustre_handle lock_handle;
 570
 571                 if (it->it_lock_mode != 0) {
 572                         lock_handle.cookie = it->it_lock_handle;
 573                         ldlm_lock_decref_and_cancel(&lock_handle,
 574                                                     it->it_lock_mode);
 575                 }
 576
 577                 it->it_lock_handle = 0;
 578                 it->it_lock_mode = 0;
 579
 580                 if (it->it_remote_lock_mode != 0) {
 581                         lock_handle.cookie = it->it_remote_lock_handle;
 582                         ldlm_lock_decref_and_cancel(&lock_handle,
 583                                                     it->it_remote_lock_mode);
 584                 }
 585
 586                 it->it_remote_lock_handle = 0;
 587                 it->it_remote_lock_mode = 0;
 588         }
 589
 590         RETURN(rc);
 591 }