drivers/staging/lustre/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, 2015, 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/pagemap.h>
  37 #include <asm/div64.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/namei.h>
  40 #include <lustre_intent.h>
  41 #include <obd_support.h>
  42 #include <lustre_lib.h>
  43 #include <lustre_net.h>
  44 #include <lustre_dlm.h>
  45 #include <lustre_mdc.h>
  46 #include <obd_class.h>
  47 #include <lprocfs_status.h>
  48 #include "lmv_internal.h"
  49
  50 static int lmv_intent_remote(struct obd_export *exp, struct lookup_intent *it,
  51                              const struct lu_fid *parent_fid,
  52                              struct ptlrpc_request **reqp,
  53                              ldlm_blocking_callback cb_blocking,
  54                              __u64 extra_lock_flags)
  55 {
  56         struct obd_device       *obd = exp->exp_obd;
  57         struct lmv_obd          *lmv = &obd->u.lmv;
  58         struct ptlrpc_request   *req = NULL;
  59         struct lustre_handle    plock;
  60         struct md_op_data       *op_data;
  61         struct lmv_tgt_desc     *tgt;
  62         struct mdt_body         *body;
  63         int                     pmode;
  64         int                     rc = 0;
  65
  66         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
  67         if (!body)
  68                 return -EPROTO;
  69
  70         LASSERT((body->mbo_valid & OBD_MD_MDS));
  71
  72         /*
  73          * Unfortunately, we have to lie to MDC/MDS to retrieve
  74          * attributes llite needs and provideproper locking.
  75          */
  76         if (it->it_op & IT_LOOKUP)
  77                 it->it_op = IT_GETATTR;
  78
  79         /*
  80          * We got LOOKUP lock, but we really need attrs.
  81          */
  82         pmode = it->it_lock_mode;
  83         if (pmode) {
  84                 plock.cookie = it->it_lock_handle;
  85                 it->it_lock_mode = 0;
  86                 it->it_request = NULL;
  87         }
  88
  89         LASSERT(fid_is_sane(&body->mbo_fid1));
  90
  91         tgt = lmv_find_target(lmv, &body->mbo_fid1);
  92         if (IS_ERR(tgt)) {
  93                 rc = PTR_ERR(tgt);
  94                 goto out;
  95         }
  96
  97         op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
  98         if (!op_data) {
  99                 rc = -ENOMEM;
 100                 goto out;
 101         }
 102
 103         op_data->op_fid1 = body->mbo_fid1;
 104         /* Sent the parent FID to the remote MDT */
 105         if (parent_fid) {
 106                 /* The parent fid is only for remote open to
 107                  * check whether the open is from OBF,
 108                  * see mdt_cross_open
 109                  */
 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;
 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 out_free_op_data:
 140         kfree(op_data);
 141 out:
 142         if (rc && pmode)
 143                 ldlm_lock_decref(&plock, pmode);
 144
 145         ptlrpc_req_finished(*reqp);
 146         *reqp = req;
 147         return rc;
 148 }
 149
 150 int lmv_revalidate_slaves(struct obd_export *exp,
 151                           const struct lmv_stripe_md *lsm,
 152                           ldlm_blocking_callback cb_blocking,
 153                           int extra_lock_flags)
 154 {
 155         struct obd_device *obd = exp->exp_obd;
 156         struct lmv_obd *lmv = &obd->u.lmv;
 157         struct ptlrpc_request *req = NULL;
 158         struct mdt_body *body;
 159         struct md_op_data *op_data;
 160         int rc = 0, i;
 161
 162         /**
 163          * revalidate slaves has some problems, temporarily return,
 164          * we may not need that
 165          */
 166         op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
 167         if (!op_data)
 168                 return -ENOMEM;
 169
 170         /**
 171          * Loop over the stripe information, check validity and update them
 172          * from MDS if needed.
 173          */
 174         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
 175                 struct lookup_intent it = { .it_op = IT_GETATTR };
 176                 struct lustre_handle *lockh = NULL;
 177                 struct lmv_tgt_desc *tgt = NULL;
 178                 struct inode *inode;
 179                 struct lu_fid fid;
 180
 181                 fid = lsm->lsm_md_oinfo[i].lmo_fid;
 182                 inode = lsm->lsm_md_oinfo[i].lmo_root;
 183
 184                 /*
 185                  * Prepare op_data for revalidating. Note that @fid2 shluld be
 186                  * defined otherwise it will go to server and take new lock
 187                  * which is not needed here.
 188                  */
 189                 memset(op_data, 0, sizeof(*op_data));
 190                 op_data->op_fid1 = fid;
 191                 op_data->op_fid2 = fid;
 192
 193                 tgt = lmv_locate_mds(lmv, op_data, &fid);
 194                 if (IS_ERR(tgt)) {
 195                         rc = PTR_ERR(tgt);
 196                         goto cleanup;
 197                 }
 198
 199                 CDEBUG(D_INODE, "Revalidate slave " DFID " -> mds #%u\n",
 200                        PFID(&fid), tgt->ltd_idx);
 201
 202                 if (req) {
 203                         ptlrpc_req_finished(req);
 204                         req = NULL;
 205                 }
 206
 207                 rc = md_intent_lock(tgt->ltd_exp, op_data, &it, &req,
 208                                     cb_blocking, extra_lock_flags);
 209                 if (rc < 0)
 210                         goto cleanup;
 211
 212                 lockh = (struct lustre_handle *)&it.it_lock_handle;
 213                 if (rc > 0 && !req) {
 214                         /* slave inode is still valid */
 215                         CDEBUG(D_INODE, "slave " DFID " is still valid.\n",
 216                                PFID(&fid));
 217                         rc = 0;
 218                 } else {
 219                         /* refresh slave from server */
 220                         body = req_capsule_server_get(&req->rq_pill,
 221                                                       &RMF_MDT_BODY);
 222                         if (!body) {
 223                                 if (it.it_lock_mode && lockh) {
 224                                         ldlm_lock_decref(lockh, it.it_lock_mode);
 225                                         it.it_lock_mode = 0;
 226                                 }
 227
 228                                 rc = -ENOENT;
 229                                 goto cleanup;
 230                         }
 231
 232                         i_size_write(inode, body->mbo_size);
 233                         inode->i_blocks = body->mbo_blocks;
 234                         set_nlink(inode, body->mbo_nlink);
 235                         LTIME_S(inode->i_atime) = body->mbo_atime;
 236                         LTIME_S(inode->i_ctime) = body->mbo_ctime;
 237                         LTIME_S(inode->i_mtime) = body->mbo_mtime;
 238                 }
 239
 240                 md_set_lock_data(tgt->ltd_exp, lockh, inode, NULL);
 241
 242                 if (it.it_lock_mode && lockh) {
 243                         ldlm_lock_decref(lockh, it.it_lock_mode);
 244                         it.it_lock_mode = 0;
 245                 }
 246         }
 247
 248 cleanup:
 249         if (req)
 250                 ptlrpc_req_finished(req);
 251
 252         kfree(op_data);
 253         return rc;
 254 }
 255
 256 /*
 257  * IT_OPEN is intended to open (and create, possible) an object. Parent (pid)
 258  * may be split dir.
 259  */
 260 static int lmv_intent_open(struct obd_export *exp, struct md_op_data *op_data,
 261                            struct lookup_intent *it,
 262                            struct ptlrpc_request **reqp,
 263                            ldlm_blocking_callback cb_blocking,
 264                            __u64 extra_lock_flags)
 265 {
 266         struct obd_device       *obd = exp->exp_obd;
 267         struct lmv_obd          *lmv = &obd->u.lmv;
 268         struct lmv_tgt_desc     *tgt;
 269         struct mdt_body         *body;
 270         int                     rc;
 271
 272         if (it->it_flags & MDS_OPEN_BY_FID) {
 273                 LASSERT(fid_is_sane(&op_data->op_fid2));
 274
 275                 /*
 276                  * for striped directory, we can't know parent stripe fid
 277                  * without name, but we can set it to child fid, and MDT
 278                  * will obtain it from linkea in open in such case.
 279                  */
 280                 if (op_data->op_mea1)
 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);
 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          */
 301         if ((it->it_op & IT_CREAT) && !(it->it_flags & MDS_OPEN_BY_FID)) {
 302                 /*
 303                  * For lookup(IT_CREATE) cases allocate new fid and setup FLD
 304                  * for it.
 305                  */
 306                 rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
 307                 if (rc != 0)
 308                         return rc;
 309         }
 310
 311         CDEBUG(D_INODE, "OPEN_INTENT with fid1=" DFID ", fid2=" DFID ", name='%s' -> mds #%u\n",
 312                PFID(&op_data->op_fid1),
 313                PFID(&op_data->op_fid2), op_data->op_name, tgt->ltd_idx);
 314
 315         rc = md_intent_lock(tgt->ltd_exp, op_data, it, reqp, cb_blocking,
 316                             extra_lock_flags);
 317         if (rc != 0)
 318                 return rc;
 319         /*
 320          * Nothing is found, do not access body->mbo_fid1 as it is zero and thus
 321          * pointless.
 322          */
 323         if ((it->it_disposition & DISP_LOOKUP_NEG) &&
 324             !(it->it_disposition & DISP_OPEN_CREATE) &&
 325             !(it->it_disposition & DISP_OPEN_OPEN))
 326                 return rc;
 327
 328         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 329         if (!body)
 330                 return -EPROTO;
 331
 332         /* Not cross-ref case, just get out of here. */
 333         if (unlikely((body->mbo_valid & OBD_MD_MDS))) {
 334                 rc = lmv_intent_remote(exp, it, &op_data->op_fid1, reqp,
 335                                        cb_blocking, extra_lock_flags);
 336                 if (rc != 0)
 337                         return rc;
 338
 339                 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 340                 if (!body)
 341                         return -EPROTO;
 342         }
 343
 344         return rc;
 345 }
 346
 347 /*
 348  * Handler for: getattr, lookup and revalidate cases.
 349  */
 350 static int lmv_intent_lookup(struct obd_export *exp,
 351                              struct md_op_data *op_data,
 352                              struct lookup_intent *it,
 353                              struct ptlrpc_request **reqp,
 354                              ldlm_blocking_callback cb_blocking,
 355                              __u64 extra_lock_flags)
 356 {
 357         struct lmv_stripe_md *lsm = op_data->op_mea1;
 358         struct obd_device      *obd = exp->exp_obd;
 359         struct lmv_obd   *lmv = &obd->u.lmv;
 360         struct lmv_tgt_desc    *tgt = NULL;
 361         struct mdt_body *body;
 362         int                  rc = 0;
 363
 364         /*
 365          * If it returns ERR_PTR(-EBADFD) then it is an unknown hash type
 366          * it will try all stripes to locate the object
 367          */
 368         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
 369         if (IS_ERR(tgt) && (PTR_ERR(tgt) != -EBADFD))
 370                 return PTR_ERR(tgt);
 371
 372         /*
 373          * Both migrating dir and unknown hash dir need to try
 374          * all of sub-stripes
 375          */
 376         if (lsm && !lmv_is_known_hash_type(lsm->lsm_md_hash_type)) {
 377                 struct lmv_oinfo *oinfo = &lsm->lsm_md_oinfo[0];
 378
 379                 op_data->op_fid1 = oinfo->lmo_fid;
 380                 op_data->op_mds = oinfo->lmo_mds;
 381                 tgt = lmv_get_target(lmv, oinfo->lmo_mds, NULL);
 382                 if (IS_ERR(tgt))
 383                         return PTR_ERR(tgt);
 384         }
 385
 386         if (!fid_is_sane(&op_data->op_fid2))
 387                 fid_zero(&op_data->op_fid2);
 388
 389         CDEBUG(D_INODE, "LOOKUP_INTENT with fid1=" DFID ", fid2=" DFID ", name='%s' -> mds #%u lsm=%p lsm_magic=%x\n",
 390                PFID(&op_data->op_fid1), PFID(&op_data->op_fid2),
 391                op_data->op_name ? op_data->op_name : "<NULL>",
 392                tgt->ltd_idx, lsm, !lsm ? -1 : lsm->lsm_md_magic);
 393
 394         op_data->op_bias &= ~MDS_CROSS_REF;
 395
 396         rc = md_intent_lock(tgt->ltd_exp, op_data, it, reqp, cb_blocking,
 397                             extra_lock_flags);
 398         if (rc < 0)
 399                 return rc;
 400
 401         if (!*reqp) {
 402                 /*
 403                  * If RPC happens, lsm information will be revalidated
 404                  * during update_inode process (see ll_update_lsm_md)
 405                  */
 406                 if (op_data->op_mea2) {
 407                         rc = lmv_revalidate_slaves(exp, op_data->op_mea2,
 408                                                    cb_blocking,
 409                                                    extra_lock_flags);
 410                         if (rc != 0)
 411                                 return rc;
 412                 }
 413                 return rc;
 414         } else if (it_disposition(it, DISP_LOOKUP_NEG) && lsm &&
 415                    lmv_need_try_all_stripes(lsm)) {
 416                 /*
 417                  * For migrating and unknown hash type directory, it will
 418                  * try to target the entry on other stripes
 419                  */
 420                 int stripe_index;
 421
 422                 for (stripe_index = 1;
 423                      stripe_index < lsm->lsm_md_stripe_count &&
 424                      it_disposition(it, DISP_LOOKUP_NEG); stripe_index++) {
 425                         struct lmv_oinfo *oinfo;
 426
 427                         /* release the previous request */
 428                         ptlrpc_req_finished(*reqp);
 429                         it->it_request = NULL;
 430                         *reqp = NULL;
 431
 432                         oinfo = &lsm->lsm_md_oinfo[stripe_index];
 433                         tgt = lmv_find_target(lmv, &oinfo->lmo_fid);
 434                         if (IS_ERR(tgt))
 435                                 return PTR_ERR(tgt);
 436
 437                         CDEBUG(D_INODE, "Try other stripes " DFID "\n",
 438                                PFID(&oinfo->lmo_fid));
 439
 440                         op_data->op_fid1 = oinfo->lmo_fid;
 441                         it->it_disposition &= ~DISP_ENQ_COMPLETE;
 442                         rc = md_intent_lock(tgt->ltd_exp, op_data, it, reqp,
 443                                             cb_blocking, extra_lock_flags);
 444                         if (rc)
 445                                 return rc;
 446                 }
 447         }
 448
 449         /*
 450          * MDS has returned success. Probably name has been resolved in
 451          * remote inode. Let's check this.
 452          */
 453         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 454         if (!body)
 455                 return -EPROTO;
 456
 457         /* Not cross-ref case, just get out of here. */
 458         if (unlikely((body->mbo_valid & OBD_MD_MDS))) {
 459                 rc = lmv_intent_remote(exp, it, NULL, reqp, cb_blocking,
 460                                        extra_lock_flags);
 461                 if (rc != 0)
 462                         return rc;
 463                 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 464                 if (!body)
 465                         return -EPROTO;
 466         }
 467
 468         return rc;
 469 }
 470
 471 int lmv_intent_lock(struct obd_export *exp, struct md_op_data *op_data,
 472                     struct lookup_intent *it, struct ptlrpc_request **reqp,
 473                     ldlm_blocking_callback cb_blocking,
 474                     __u64 extra_lock_flags)
 475 {
 476         int             rc;
 477
 478         LASSERT(fid_is_sane(&op_data->op_fid1));
 479
 480         CDEBUG(D_INODE, "INTENT LOCK '%s' for " DFID " '%*s' on " DFID "\n",
 481                LL_IT2STR(it), PFID(&op_data->op_fid2),
 482                (int)op_data->op_namelen, op_data->op_name,
 483                PFID(&op_data->op_fid1));
 484
 485         if (it->it_op & (IT_LOOKUP | IT_GETATTR | IT_LAYOUT))
 486                 rc = lmv_intent_lookup(exp, op_data, it, reqp, cb_blocking,
 487                                        extra_lock_flags);
 488         else if (it->it_op & IT_OPEN)
 489                 rc = lmv_intent_open(exp, op_data, it, reqp, cb_blocking,
 490                                      extra_lock_flags);
 491         else
 492                 LBUG();
 493
 494         if (rc < 0) {
 495                 struct lustre_handle lock_handle;
 496
 497                 if (it->it_lock_mode) {
 498                         lock_handle.cookie = it->it_lock_handle;
 499                         ldlm_lock_decref(&lock_handle, 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) {
 506                         lock_handle.cookie = it->it_remote_lock_handle;
 507                         ldlm_lock_decref(&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 }