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/lustre_idl.h>
  46 #include <lustre_lib.h>
  47 #include <lustre_net.h>
  48 #include <lustre_dlm.h>
  49 #include <lustre_mdc.h>
  50 #include <obd_class.h>
  51 #include <lprocfs_status.h>
  52 #include "lmv_internal.h"
  53
  54 static int lmv_intent_remote(struct obd_export *exp, struct lookup_intent *it,
  55                              const struct lu_fid *parent_fid,
  56                              struct ptlrpc_request **reqp,
  57                              ldlm_blocking_callback cb_blocking,
  58                              __u64 extra_lock_flags)
  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          * Unfortunately, we have to lie to MDC/MDS to retrieve
  79          * attributes llite needs and provideproper locking.
  80          */
  81         if (it->it_op & IT_LOOKUP)
  82                 it->it_op = IT_GETATTR;
  83
  84         /*
  85          * We got LOOKUP lock, but we really need attrs.
  86          */
  87         pmode = it->it_lock_mode;
  88         if (pmode) {
  89                 plock.cookie = it->it_lock_handle;
  90                 it->it_lock_mode = 0;
  91                 it->it_request = NULL;
  92         }
  93
  94         LASSERT(fid_is_sane(&body->mbo_fid1));
  95
  96         tgt = lmv_find_target(lmv, &body->mbo_fid1);
  97         if (IS_ERR(tgt))
  98                 GOTO(out, rc = PTR_ERR(tgt));
  99
 100         OBD_ALLOC_PTR(op_data);
 101         if (op_data == NULL)
 102                 GOTO(out, rc = -ENOMEM);
 103
 104         op_data->op_fid1 = body->mbo_fid1;
 105         /* Sent the parent FID to the remote MDT */
 106         if (parent_fid != NULL) {
 107                 /* The parent fid is only for remote open to
 108                  * check whether the open is from OBF,
 109                  * see mdt_cross_open */
 110                 LASSERT(it->it_op & IT_OPEN);
 111                 op_data->op_fid2 = *parent_fid;
 112         }
 113
 114         op_data->op_bias = MDS_CROSS_REF;
 115         CDEBUG(D_INODE, "REMOTE_INTENT with fid="DFID" -> mds #%u\n",
 116                PFID(&body->mbo_fid1), tgt->ltd_idx);
 117
 118         rc = md_intent_lock(tgt->ltd_exp, op_data, it, &req, cb_blocking,
 119                             extra_lock_flags);
 120         if (rc)
 121                 GOTO(out_free_op_data, rc);
 122
 123         /*
 124          * LLite needs LOOKUP lock to track dentry revocation in order to
 125          * maintain dcache consistency. Thus drop UPDATE|PERM lock here
 126          * and put LOOKUP in request.
 127          */
 128         if (it->it_lock_mode != 0) {
 129                 it->it_remote_lock_handle =
 130                                         it->it_lock_handle;
 131                 it->it_remote_lock_mode = it->it_lock_mode;
 132         }
 133
 134         if (pmode) {
 135                 it->it_lock_handle = plock.cookie;
 136                 it->it_lock_mode = pmode;
 137         }
 138
 139         EXIT;
 140 out_free_op_data:
 141         OBD_FREE_PTR(op_data);
 142 out:
 143         if (rc && pmode)
 144                 ldlm_lock_decref(&plock, pmode);
 145
 146         ptlrpc_req_finished(*reqp);
 147         *reqp = req;
 148         return rc;
 149 }
 150
 151 int lmv_revalidate_slaves(struct obd_export *exp,
 152                           const struct lmv_stripe_md *lsm,
 153                           ldlm_blocking_callback cb_blocking,
 154                           int extra_lock_flags)
 155 {
 156         struct obd_device      *obd = exp->exp_obd;
 157         struct lmv_obd         *lmv = &obd->u.lmv;
 158         struct ptlrpc_request   *req = NULL;
 159         struct mdt_body         *body;
 160         struct md_op_data      *op_data;
 161         int                     i;
 162         int                     rc = 0;
 163
 164         ENTRY;
 165
 166         /**
 167          * revalidate slaves has some problems, temporarily return,
 168          * we may not need that
 169          */
 170         OBD_ALLOC_PTR(op_data);
 171         if (op_data == NULL)
 172                 RETURN(-ENOMEM);
 173
 174         /**
 175          * Loop over the stripe information, check validity and update them
 176          * from MDS if needed.
 177          */
 178         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
 179                 struct lu_fid           fid;
 180                 struct lookup_intent    it = { .it_op = IT_GETATTR };
 181                 struct lustre_handle    *lockh = NULL;
 182                 struct lmv_tgt_desc     *tgt = NULL;
 183                 struct inode            *inode;
 184
 185                 fid = lsm->lsm_md_oinfo[i].lmo_fid;
 186                 inode = lsm->lsm_md_oinfo[i].lmo_root;
 187
 188                 /*
 189                  * Prepare op_data for revalidating. Note that @fid2 shluld be
 190                  * defined otherwise it will go to server and take new lock
 191                  * which is not needed here.
 192                  */
 193                 memset(op_data, 0, sizeof(*op_data));
 194                 op_data->op_fid1 = fid;
 195                 op_data->op_fid2 = fid;
 196
 197                 tgt = lmv_locate_mds(lmv, op_data, &fid);
 198                 if (IS_ERR(tgt))
 199                         GOTO(cleanup, rc = PTR_ERR(tgt));
 200
 201                 CDEBUG(D_INODE, "Revalidate slave "DFID" -> mds #%u\n",
 202                        PFID(&fid), tgt->ltd_idx);
 203
 204                 if (req != NULL) {
 205                         ptlrpc_req_finished(req);
 206                         req = NULL;
 207                 }
 208
 209                 rc = md_intent_lock(tgt->ltd_exp, op_data, &it, &req,
 210                                     cb_blocking, extra_lock_flags);
 211                 if (rc < 0)
 212                         GOTO(cleanup, rc);
 213
 214                 lockh = (struct lustre_handle *)&it.it_lock_handle;
 215                 if (rc > 0 && req == NULL) {
 216                         /* slave inode is still valid */
 217                         CDEBUG(D_INODE, "slave "DFID" is still valid.\n",
 218                                PFID(&fid));
 219                         rc = 0;
 220                 } else {
 221                         /* refresh slave from server */
 222                         body = req_capsule_server_get(&req->rq_pill,
 223                                                       &RMF_MDT_BODY);
 224                         if (body == NULL) {
 225                                 if (it.it_lock_mode && lockh) {
 226                                         ldlm_lock_decref(lockh,
 227                                                  it.it_lock_mode);
 228                                         it.it_lock_mode = 0;
 229                                 }
 230                                 GOTO(cleanup, rc = -ENOENT);
 231                         }
 232
 233                         i_size_write(inode, body->mbo_size);
 234                         inode->i_blocks = body->mbo_blocks;
 235                         set_nlink(inode, body->mbo_nlink);
 236                         LTIME_S(inode->i_atime) = body->mbo_atime;
 237                         LTIME_S(inode->i_ctime) = body->mbo_ctime;
 238                         LTIME_S(inode->i_mtime) = body->mbo_mtime;
 239                 }
 240
 241                 md_set_lock_data(tgt->ltd_exp, lockh, inode, NULL);
 242                 if (it.it_lock_mode != 0 && lockh != NULL) {
 243                         ldlm_lock_decref(lockh, it.it_lock_mode);
 244                         it.it_lock_mode = 0;
 245                 }
 246         }
 247
 248 cleanup:
 249         if (req != NULL)
 250                 ptlrpc_req_finished(req);
 251
 252         OBD_FREE_PTR(op_data);
 253         RETURN(rc);
 254 }
 255
 256
 257 /*
 258  * IT_OPEN is intended to open (and create, possible) an object. Parent (pid)
 259  * may be split dir.
 260  */
 261 static int lmv_intent_open(struct obd_export *exp, struct md_op_data *op_data,
 262                            struct lookup_intent *it,
 263                            struct ptlrpc_request **reqp,
 264                            ldlm_blocking_callback cb_blocking,
 265                            __u64 extra_lock_flags)
 266 {
 267         struct obd_device       *obd = exp->exp_obd;
 268         struct lmv_obd          *lmv = &obd->u.lmv;
 269         struct lmv_tgt_desc     *tgt;
 270         struct mdt_body         *body;
 271         int                     rc;
 272         ENTRY;
 273
 274         if (it->it_flags & MDS_OPEN_BY_FID) {
 275                 LASSERT(fid_is_sane(&op_data->op_fid2));
 276
 277                 /* for striped directory, we can't know parent stripe fid
 278                  * without name, but we can set it to child fid, and MDT
 279                  * will obtain it from linkea in open in such case. */
 280                 if (op_data->op_mea1 != NULL)
 281                         op_data->op_fid1 = op_data->op_fid2;
 282
 283                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
 284                 if (IS_ERR(tgt))
 285                         RETURN(PTR_ERR(tgt));
 286
 287                 op_data->op_mds = tgt->ltd_idx;
 288         } else {
 289                 LASSERT(fid_is_sane(&op_data->op_fid1));
 290                 LASSERT(fid_is_zero(&op_data->op_fid2));
 291                 LASSERT(op_data->op_name != NULL);
 292
 293                 tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
 294                 if (IS_ERR(tgt))
 295                         RETURN(PTR_ERR(tgt));
 296         }
 297
 298         /* If it is ready to open the file by FID, do not need
 299          * allocate FID at all, otherwise it will confuse MDT */
 300         if ((it->it_op & IT_CREAT) && !(it->it_flags & MDS_OPEN_BY_FID)) {
 301                 /*
 302                  * For lookup(IT_CREATE) cases allocate new fid and setup FLD
 303                  * for it.
 304                  */
 305                 rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
 306                 if (rc != 0)
 307                         RETURN(rc);
 308         }
 309
 310         CDEBUG(D_INODE, "OPEN_INTENT with fid1="DFID", fid2="DFID","
 311                " name='%s' -> mds #%u\n", PFID(&op_data->op_fid1),
 312                PFID(&op_data->op_fid2), op_data->op_name, tgt->ltd_idx);
 313
 314         rc = md_intent_lock(tgt->ltd_exp, op_data, it, reqp, cb_blocking,
 315                             extra_lock_flags);
 316         if (rc != 0)
 317                 RETURN(rc);
 318         /*
 319          * Nothing is found, do not access body->fid1 as it is zero and thus
 320          * pointless.
 321          */
 322         if ((it->it_disposition & DISP_LOOKUP_NEG) &&
 323             !(it->it_disposition & DISP_OPEN_CREATE) &&
 324             !(it->it_disposition & DISP_OPEN_OPEN))
 325                 RETURN(rc);
 326
 327         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 328         if (body == NULL)
 329                 RETURN(-EPROTO);
 330
 331         /* Not cross-ref case, just get out of here. */
 332         if (unlikely((body->mbo_valid & OBD_MD_MDS))) {
 333                 rc = lmv_intent_remote(exp, it, &op_data->op_fid1, reqp,
 334                                        cb_blocking, extra_lock_flags);
 335                 if (rc != 0)
 336                         RETURN(rc);
 337
 338                 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 339                 if (body == NULL)
 340                         RETURN(-EPROTO);
 341         }
 342
 343         RETURN(rc);
 344 }
 345
 346 /*
 347  * Handler for: getattr, lookup and revalidate cases.
 348  */
 349 static int
 350 lmv_intent_lookup(struct obd_export *exp, struct md_op_data *op_data,
 351                   struct lookup_intent *it, struct ptlrpc_request **reqp,
 352                   ldlm_blocking_callback cb_blocking,
 353                   __u64 extra_lock_flags)
 354 {
 355         struct obd_device       *obd = exp->exp_obd;
 356         struct lmv_obd          *lmv = &obd->u.lmv;
 357         struct lmv_tgt_desc     *tgt = NULL;
 358         struct mdt_body         *body;
 359         struct lmv_stripe_md    *lsm = op_data->op_mea1;
 360         int                     rc = 0;
 361         ENTRY;
 362
 363         /* If it returns ERR_PTR(-EBADFD) then it is an unknown hash type
 364          * it will try all stripes to locate the object */
 365         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
 366         if (IS_ERR(tgt) && (PTR_ERR(tgt) != -EBADFD))
 367                 RETURN(PTR_ERR(tgt));
 368
 369         /* Both migrating dir and unknown hash dir need to try
 370          * all of sub-stripes */
 371         if (lsm != NULL && !lmv_is_known_hash_type(lsm->lsm_md_hash_type)) {
 372                 struct lmv_oinfo *oinfo;
 373
 374                 oinfo = &lsm->lsm_md_oinfo[0];
 375
 376                 op_data->op_fid1 = oinfo->lmo_fid;
 377                 op_data->op_mds = oinfo->lmo_mds;
 378                 tgt = lmv_get_target(lmv, oinfo->lmo_mds, NULL);
 379                 if (IS_ERR(tgt))
 380                         RETURN(PTR_ERR(tgt));
 381         }
 382
 383         if (!fid_is_sane(&op_data->op_fid2))
 384                 fid_zero(&op_data->op_fid2);
 385
 386         CDEBUG(D_INODE, "LOOKUP_INTENT with fid1="DFID", fid2="DFID
 387                ", name='%s' -> mds #%u lsm=%p lsm_magic=%x\n",
 388                PFID(&op_data->op_fid1), PFID(&op_data->op_fid2),
 389                op_data->op_name ? op_data->op_name : "<NULL>",
 390                tgt->ltd_idx, lsm, lsm == NULL ? -1 : lsm->lsm_md_magic);
 391
 392         op_data->op_bias &= ~MDS_CROSS_REF;
 393
 394         rc = md_intent_lock(tgt->ltd_exp, op_data, it, reqp, cb_blocking,
 395                             extra_lock_flags);
 396         if (rc < 0)
 397                 RETURN(rc);
 398
 399         if (*reqp == NULL) {
 400                 /* If RPC happens, lsm information will be revalidated
 401                  * during update_inode process (see ll_update_lsm_md) */
 402                 if (op_data->op_mea2 != NULL) {
 403                         rc = lmv_revalidate_slaves(exp, op_data->op_mea2,
 404                                                    cb_blocking,
 405                                                    extra_lock_flags);
 406                         if (rc != 0)
 407                                 RETURN(rc);
 408                 }
 409                 RETURN(rc);
 410         } else if (it_disposition(it, DISP_LOOKUP_NEG) && lsm != NULL &&
 411                    lmv_need_try_all_stripes(lsm)) {
 412                 /* For migrating and unknown hash type directory, it will
 413                  * try to target the entry on other stripes */
 414                 int stripe_index;
 415
 416                 for (stripe_index = 1;
 417                      stripe_index < lsm->lsm_md_stripe_count &&
 418                      it_disposition(it, DISP_LOOKUP_NEG); stripe_index++) {
 419                         struct lmv_oinfo *oinfo;
 420
 421                         /* release the previous request */
 422                         ptlrpc_req_finished(*reqp);
 423                         it->it_request = NULL;
 424                         *reqp = NULL;
 425
 426                         oinfo = &lsm->lsm_md_oinfo[stripe_index];
 427                         tgt = lmv_find_target(lmv, &oinfo->lmo_fid);
 428                         if (IS_ERR(tgt))
 429                                 RETURN(PTR_ERR(tgt));
 430
 431                         CDEBUG(D_INODE, "Try other stripes " DFID"\n",
 432                                PFID(&oinfo->lmo_fid));
 433
 434                         op_data->op_fid1 = oinfo->lmo_fid;
 435                         it->it_disposition &= ~DISP_ENQ_COMPLETE;
 436                         rc = md_intent_lock(tgt->ltd_exp, op_data, it, reqp,
 437                                             cb_blocking, extra_lock_flags);
 438                         if (rc != 0)
 439                                 RETURN(rc);
 440                 }
 441         }
 442
 443         if (!it_has_reply_body(it))
 444                 RETURN(0);
 445
 446         /*
 447          * MDS has returned success. Probably name has been resolved in
 448          * remote inode. Let's check this.
 449          */
 450         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 451         if (body == NULL)
 452                 RETURN(-EPROTO);
 453
 454         /* Not cross-ref case, just get out of here. */
 455         if (unlikely((body->mbo_valid & OBD_MD_MDS))) {
 456                 rc = lmv_intent_remote(exp, it, NULL, reqp, cb_blocking,
 457                                        extra_lock_flags);
 458                 if (rc != 0)
 459                         RETURN(rc);
 460                 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 461                 if (body == NULL)
 462                         RETURN(-EPROTO);
 463         }
 464
 465         RETURN(rc);
 466 }
 467
 468 int lmv_intent_lock(struct obd_export *exp, struct md_op_data *op_data,
 469                     struct lookup_intent *it, struct ptlrpc_request **reqp,
 470                     ldlm_blocking_callback cb_blocking,
 471                     __u64 extra_lock_flags)
 472 {
 473         int rc;
 474         ENTRY;
 475
 476         LASSERT(it != NULL);
 477         LASSERT(fid_is_sane(&op_data->op_fid1));
 478
 479         CDEBUG(D_INODE, "INTENT LOCK '%s' for "DFID" '%.*s' on "DFID"\n",
 480                 LL_IT2STR(it), PFID(&op_data->op_fid2),
 481                 (int)op_data->op_namelen, op_data->op_name,
 482                 PFID(&op_data->op_fid1));
 483
 484         if (it->it_op & (IT_LOOKUP | IT_GETATTR | IT_LAYOUT | IT_GETXATTR))
 485                 rc = lmv_intent_lookup(exp, op_data, it, reqp, cb_blocking,
 486                                        extra_lock_flags);
 487         else if (it->it_op & IT_OPEN)
 488                 rc = lmv_intent_open(exp, op_data, it, reqp, cb_blocking,
 489                                      extra_lock_flags);
 490         else
 491                 LBUG();
 492
 493         if (rc < 0) {
 494                 struct lustre_handle lock_handle;
 495
 496                 if (it->it_lock_mode != 0) {
 497                         lock_handle.cookie = it->it_lock_handle;
 498                         ldlm_lock_decref_and_cancel(&lock_handle,
 499                                                     it->it_lock_mode);
 500                 }
 501
 502                 it->it_lock_handle = 0;
 503                 it->it_lock_mode = 0;
 504
 505                 if (it->it_remote_lock_mode != 0) {
 506                         lock_handle.cookie = it->it_remote_lock_handle;
 507                         ldlm_lock_decref_and_cancel(&lock_handle,
 508                                                     it->it_remote_lock_mode);
 509                 }
 510
 511                 it->it_remote_lock_handle = 0;
 512                 it->it_remote_lock_mode = 0;
 513         }
 514
 515         RETURN(rc);
 516 }