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