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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2013, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LMV
  38 #include <linux/slab.h>
  39 #include <linux/module.h>
  40 #include <linux/init.h>
  41 #include <linux/slab.h>
  42 #include <linux/pagemap.h>
  43 #include <linux/math64.h>
  44 #include <linux/seq_file.h>
  45 #include <linux/namei.h>
  46 #include <linux/lustre_intent.h>
  47
  48 #include <obd_support.h>
  49 #include <lustre/lustre_idl.h>
  50 #include <lustre_lib.h>
  51 #include <lustre_net.h>
  52 #include <lustre_dlm.h>
  53 #include <lustre_mdc.h>
  54 #include <obd_class.h>
  55 #include <lprocfs_status.h>
  56 #include "lmv_internal.h"
  57
  58 static int lmv_intent_remote(struct obd_export *exp, struct lookup_intent *it,
  59                              const struct lu_fid *parent_fid,
  60                              struct ptlrpc_request **reqp,
  61                              ldlm_blocking_callback cb_blocking,
  62                              __u64 extra_lock_flags)
  63 {
  64         struct obd_device       *obd = exp->exp_obd;
  65         struct lmv_obd          *lmv = &obd->u.lmv;
  66         struct ptlrpc_request   *req = NULL;
  67         struct lustre_handle    plock;
  68         struct md_op_data       *op_data;
  69         struct lmv_tgt_desc     *tgt;
  70         struct mdt_body         *body;
  71         int                     pmode;
  72         int                     rc = 0;
  73         ENTRY;
  74
  75         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
  76         if (body == NULL)
  77                 RETURN(-EPROTO);
  78
  79         LASSERT((body->mbo_valid & OBD_MD_MDS));
  80
  81         /*
  82          * Unfortunately, we have to lie to MDC/MDS to retrieve
  83          * attributes llite needs and provideproper locking.
  84          */
  85         if (it->it_op & IT_LOOKUP)
  86                 it->it_op = IT_GETATTR;
  87
  88         /*
  89          * We got LOOKUP lock, but we really need attrs.
  90          */
  91         pmode = it->d.lustre.it_lock_mode;
  92         if (pmode) {
  93                 plock.cookie = it->d.lustre.it_lock_handle;
  94                 it->d.lustre.it_lock_mode = 0;
  95                 it->d.lustre.it_data = NULL;
  96         }
  97
  98         LASSERT(fid_is_sane(&body->mbo_fid1));
  99
 100         tgt = lmv_find_target(lmv, &body->mbo_fid1);
 101         if (IS_ERR(tgt))
 102                 GOTO(out, rc = PTR_ERR(tgt));
 103
 104         OBD_ALLOC_PTR(op_data);
 105         if (op_data == NULL)
 106                 GOTO(out, rc = -ENOMEM);
 107
 108         op_data->op_fid1 = body->mbo_fid1;
 109         /* Sent the parent FID to the remote MDT */
 110         if (parent_fid != NULL) {
 111                 /* The parent fid is only for remote open to
 112                  * check whether the open is from OBF,
 113                  * see mdt_cross_open */
 114                 LASSERT(it->it_op & IT_OPEN);
 115                 op_data->op_fid2 = *parent_fid;
 116         }
 117
 118         op_data->op_bias = MDS_CROSS_REF;
 119         CDEBUG(D_INODE, "REMOTE_INTENT with fid="DFID" -> mds #%d\n",
 120                PFID(&body->mbo_fid1), tgt->ltd_idx);
 121
 122         rc = md_intent_lock(tgt->ltd_exp, op_data, it, &req, cb_blocking,
 123                             extra_lock_flags);
 124         if (rc)
 125                 GOTO(out_free_op_data, rc);
 126
 127         /*
 128          * LLite needs LOOKUP lock to track dentry revocation in order to
 129          * maintain dcache consistency. Thus drop UPDATE|PERM lock here
 130          * and put LOOKUP in request.
 131          */
 132         if (it->d.lustre.it_lock_mode != 0) {
 133                 it->d.lustre.it_remote_lock_handle =
 134                                         it->d.lustre.it_lock_handle;
 135                 it->d.lustre.it_remote_lock_mode = it->d.lustre.it_lock_mode;
 136         }
 137
 138         if (pmode) {
 139                 it->d.lustre.it_lock_handle = plock.cookie;
 140                 it->d.lustre.it_lock_mode = pmode;
 141         }
 142
 143         EXIT;
 144 out_free_op_data:
 145         OBD_FREE_PTR(op_data);
 146 out:
 147         if (rc && pmode)
 148                 ldlm_lock_decref(&plock, pmode);
 149
 150         ptlrpc_req_finished(*reqp);
 151         *reqp = req;
 152         return rc;
 153 }
 154
 155 int lmv_revalidate_slaves(struct obd_export *exp, struct mdt_body *mbody,
 156                           struct lmv_stripe_md *lsm,
 157                           ldlm_blocking_callback cb_blocking,
 158                           int extra_lock_flags)
 159 {
 160         struct obd_device      *obd = exp->exp_obd;
 161         struct lmv_obd         *lmv = &obd->u.lmv;
 162         struct mdt_body         *body;
 163         struct md_op_data      *op_data;
 164         unsigned long           size = 0;
 165         unsigned long           nlink = 0;
 166         obd_time                atime = 0;
 167         obd_time                ctime = 0;
 168         obd_time                mtime = 0;
 169         int                     i;
 170         int                     rc = 0;
 171
 172         ENTRY;
 173
 174         /**
 175          * revalidate slaves has some problems, temporarily return,
 176          * we may not need that
 177          */
 178         OBD_ALLOC_PTR(op_data);
 179         if (op_data == NULL)
 180                 RETURN(-ENOMEM);
 181
 182         /**
 183          * Loop over the stripe information, check validity and update them
 184          * from MDS if needed.
 185          */
 186         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
 187                 struct lu_fid           fid;
 188                 struct lookup_intent    it = { .it_op = IT_GETATTR };
 189                 struct ptlrpc_request   *req = NULL;
 190                 struct lustre_handle    *lockh = NULL;
 191                 struct lmv_tgt_desc     *tgt = NULL;
 192                 struct inode            *inode;
 193
 194                 fid = lsm->lsm_md_oinfo[i].lmo_fid;
 195                 inode = lsm->lsm_md_oinfo[i].lmo_root;
 196
 197                 /*
 198                  * Prepare op_data for revalidating. Note that @fid2 shluld be
 199                  * defined otherwise it will go to server and take new lock
 200                  * which is not needed here.
 201                  */
 202                 memset(op_data, 0, sizeof(*op_data));
 203                 op_data->op_fid1 = fid;
 204                 op_data->op_fid2 = fid;
 205
 206                 tgt = lmv_locate_mds(lmv, op_data, &fid);
 207                 if (IS_ERR(tgt))
 208                         GOTO(cleanup, rc = PTR_ERR(tgt));
 209
 210                 CDEBUG(D_INODE, "Revalidate slave "DFID" -> mds #%d\n",
 211                        PFID(&fid), tgt->ltd_idx);
 212
 213                 rc = md_intent_lock(tgt->ltd_exp, op_data, &it, &req,
 214                                     cb_blocking, extra_lock_flags);
 215                 if (rc < 0)
 216                         GOTO(cleanup, rc);
 217
 218                 lockh = (struct lustre_handle *)&it.d.lustre.it_lock_handle;
 219                 if (rc > 0 && req == NULL) {
 220                         /* slave inode is still valid */
 221                         CDEBUG(D_INODE, "slave "DFID" is still valid.\n",
 222                                PFID(&fid));
 223                         rc = 0;
 224                 } else {
 225                         /* refresh slave from server */
 226                         body = req_capsule_server_get(&req->rq_pill,
 227                                                       &RMF_MDT_BODY);
 228                         LASSERT(body != NULL);
 229                         if (unlikely(body->mbo_nlink < 2)) {
 230                                 CERROR("%s: nlink %d < 2 corrupt stripe %d "DFID
 231                                        ":" DFID"\n",
 232                                        obd->obd_name, body->mbo_nlink, i,
 233                                        PFID(&lsm->lsm_md_oinfo[i].lmo_fid),
 234                                        PFID(&lsm->lsm_md_oinfo[0].lmo_fid));
 235
 236                                 if (req != NULL)
 237                                         ptlrpc_req_finished(req);
 238
 239                                 if (it.d.lustre.it_lock_mode && lockh) {
 240                                         ldlm_lock_decref(lockh,
 241                                                  it.d.lustre.it_lock_mode);
 242                                         it.d.lustre.it_lock_mode = 0;
 243                                 }
 244
 245                                 GOTO(cleanup, rc = -EIO);
 246                         }
 247
 248
 249                         i_size_write(inode, body->mbo_size);
 250                         set_nlink(inode, body->mbo_nlink);
 251                         LTIME_S(inode->i_atime) = body->mbo_atime;
 252                         LTIME_S(inode->i_ctime) = body->mbo_ctime;
 253                         LTIME_S(inode->i_mtime) = body->mbo_mtime;
 254
 255                         if (req != NULL)
 256                                 ptlrpc_req_finished(req);
 257                 }
 258
 259                 md_set_lock_data(tgt->ltd_exp, &lockh->cookie, inode, NULL);
 260
 261                 size += i_size_read(inode);
 262
 263                 if (i != 0)
 264                         nlink += inode->i_nlink - 2;
 265                 else
 266                         nlink += inode->i_nlink;
 267
 268                 atime = LTIME_S(inode->i_atime) > atime ?
 269                                 LTIME_S(inode->i_atime) : atime;
 270                 ctime = LTIME_S(inode->i_ctime) > ctime ?
 271                                 LTIME_S(inode->i_ctime) : ctime;
 272                 mtime = LTIME_S(inode->i_mtime) > mtime ?
 273                                 LTIME_S(inode->i_mtime) : mtime;
 274
 275                 if (it.d.lustre.it_lock_mode != 0 && lockh != NULL) {
 276                         ldlm_lock_decref(lockh, it.d.lustre.it_lock_mode);
 277                         it.d.lustre.it_lock_mode = 0;
 278                 }
 279
 280                 CDEBUG(D_INODE, "i %d "DFID" size %llu, nlink %u, atime "
 281                        "%lu, mtime %lu, ctime %lu.\n", i, PFID(&fid),
 282                        i_size_read(inode), inode->i_nlink,
 283                        LTIME_S(inode->i_atime), LTIME_S(inode->i_mtime),
 284                        LTIME_S(inode->i_ctime));
 285         }
 286
 287         /*
 288          * update attr of master request.
 289          */
 290         CDEBUG(D_INODE, "Return refreshed attrs: size = %lu nlink %lu atime "
 291                LPU64 "ctime "LPU64" mtime "LPU64" for " DFID"\n", size, nlink,
 292                atime, ctime, mtime, PFID(&lsm->lsm_md_oinfo[0].lmo_fid));
 293
 294         if (mbody != NULL) {
 295                 mbody->mbo_atime = atime;
 296                 mbody->mbo_ctime = ctime;
 297                 mbody->mbo_mtime = mtime;
 298         }
 299 cleanup:
 300         OBD_FREE_PTR(op_data);
 301         RETURN(rc);
 302 }
 303
 304
 305 /*
 306  * IT_OPEN is intended to open (and create, possible) an object. Parent (pid)
 307  * may be split dir.
 308  */
 309 int lmv_intent_open(struct obd_export *exp, struct md_op_data *op_data,
 310                     struct lookup_intent *it, struct ptlrpc_request **reqp,
 311                     ldlm_blocking_callback cb_blocking, __u64 extra_lock_flags)
 312 {
 313         struct obd_device       *obd = exp->exp_obd;
 314         struct lmv_obd          *lmv = &obd->u.lmv;
 315         struct lmv_tgt_desc     *tgt;
 316         struct mdt_body         *body;
 317         int                     rc;
 318         ENTRY;
 319
 320         if (it->it_flags & MDS_OPEN_BY_FID) {
 321                 LASSERT(fid_is_sane(&op_data->op_fid2));
 322
 323                 /* for striped directory, we can't know parent stripe fid
 324                  * without name, but we can set it to child fid, and MDT
 325                  * will obtain it from linkea in open in such case. */
 326                 if (op_data->op_mea1 != NULL)
 327                         op_data->op_fid1 = op_data->op_fid2;
 328
 329                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
 330                 if (IS_ERR(tgt))
 331                         RETURN(PTR_ERR(tgt));
 332
 333                 op_data->op_mds = tgt->ltd_idx;
 334         } else {
 335                 LASSERT(fid_is_sane(&op_data->op_fid1));
 336                 LASSERT(fid_is_zero(&op_data->op_fid2));
 337                 LASSERT(op_data->op_name != NULL);
 338
 339                 tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
 340                 if (IS_ERR(tgt))
 341                         RETURN(PTR_ERR(tgt));
 342         }
 343
 344         /* If it is ready to open the file by FID, do not need
 345          * allocate FID at all, otherwise it will confuse MDT */
 346         if ((it->it_op & IT_CREAT) && !(it->it_flags & MDS_OPEN_BY_FID)) {
 347                 /*
 348                  * For lookup(IT_CREATE) cases allocate new fid and setup FLD
 349                  * for it.
 350                  */
 351                 rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
 352                 if (rc != 0)
 353                         RETURN(rc);
 354         }
 355
 356         CDEBUG(D_INODE, "OPEN_INTENT with fid1="DFID", fid2="DFID","
 357                " name='%s' -> mds #%d\n", PFID(&op_data->op_fid1),
 358                PFID(&op_data->op_fid2), op_data->op_name, tgt->ltd_idx);
 359
 360         rc = md_intent_lock(tgt->ltd_exp, op_data, it, reqp, cb_blocking,
 361                             extra_lock_flags);
 362         if (rc != 0)
 363                 RETURN(rc);
 364         /*
 365          * Nothing is found, do not access body->fid1 as it is zero and thus
 366          * pointless.
 367          */
 368         if ((it->d.lustre.it_disposition & DISP_LOOKUP_NEG) &&
 369             !(it->d.lustre.it_disposition & DISP_OPEN_CREATE) &&
 370             !(it->d.lustre.it_disposition & DISP_OPEN_OPEN))
 371                 RETURN(rc);
 372
 373         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 374         if (body == NULL)
 375                 RETURN(-EPROTO);
 376
 377         /* Not cross-ref case, just get out of here. */
 378         if (unlikely((body->mbo_valid & OBD_MD_MDS))) {
 379                 rc = lmv_intent_remote(exp, it, &op_data->op_fid1, reqp,
 380                                        cb_blocking, extra_lock_flags);
 381                 if (rc != 0)
 382                         RETURN(rc);
 383
 384                 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 385                 if (body == NULL)
 386                         RETURN(-EPROTO);
 387         }
 388
 389         RETURN(rc);
 390 }
 391
 392 /*
 393  * Handler for: getattr, lookup and revalidate cases.
 394  */
 395 static int
 396 lmv_intent_lookup(struct obd_export *exp, struct md_op_data *op_data,
 397                   struct lookup_intent *it, struct ptlrpc_request **reqp,
 398                   ldlm_blocking_callback cb_blocking,
 399                   __u64 extra_lock_flags)
 400 {
 401         struct obd_device       *obd = exp->exp_obd;
 402         struct lmv_obd          *lmv = &obd->u.lmv;
 403         struct lmv_tgt_desc     *tgt = NULL;
 404         struct mdt_body         *body;
 405         struct lmv_stripe_md    *lsm = op_data->op_mea1;
 406         int                     rc = 0;
 407         ENTRY;
 408
 409         /* If it returns ERR_PTR(-EBADFD) then it is an unknown hash type
 410          * it will try all stripes to locate the object */
 411         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
 412         if (IS_ERR(tgt) && (PTR_ERR(tgt) != -EBADFD))
 413                 RETURN(PTR_ERR(tgt));
 414
 415         /* Both migrating dir and unknown hash dir need to try
 416          * all of sub-stripes */
 417         if (lsm != NULL && !lmv_is_known_hash_type(lsm)) {
 418                 struct lmv_oinfo *oinfo;
 419
 420                 oinfo = &lsm->lsm_md_oinfo[0];
 421
 422                 op_data->op_fid1 = oinfo->lmo_fid;
 423                 op_data->op_mds = oinfo->lmo_mds;
 424                 tgt = lmv_get_target(lmv, oinfo->lmo_mds, NULL);
 425                 if (IS_ERR(tgt))
 426                         RETURN(PTR_ERR(tgt));
 427         }
 428
 429         if (!fid_is_sane(&op_data->op_fid2))
 430                 fid_zero(&op_data->op_fid2);
 431
 432         CDEBUG(D_INODE, "LOOKUP_INTENT with fid1="DFID", fid2="DFID
 433                ", name='%s' -> mds #%d lsm=%p lsm_magic=%x\n",
 434                PFID(&op_data->op_fid1), PFID(&op_data->op_fid2),
 435                op_data->op_name ? op_data->op_name : "<NULL>",
 436                tgt->ltd_idx, lsm, lsm == NULL ? -1 : lsm->lsm_md_magic);
 437
 438         op_data->op_bias &= ~MDS_CROSS_REF;
 439
 440         rc = md_intent_lock(tgt->ltd_exp, op_data, it, reqp, cb_blocking,
 441                             extra_lock_flags);
 442         if (rc < 0)
 443                 RETURN(rc);
 444
 445         if (*reqp == NULL) {
 446                 /* If RPC happens, lsm information will be revalidated
 447                  * during update_inode process (see ll_update_lsm_md) */
 448                 if (op_data->op_mea2 != NULL) {
 449                         rc = lmv_revalidate_slaves(exp, NULL, op_data->op_mea2,
 450                                                    cb_blocking,
 451                                                    extra_lock_flags);
 452                         if (rc != 0)
 453                                 RETURN(rc);
 454                 }
 455                 RETURN(rc);
 456         } else if (it_disposition(it, DISP_LOOKUP_NEG) && lsm != NULL &&
 457                    lmv_need_try_all_stripes(lsm)) {
 458                 /* For migrating and unknown hash type directory, it will
 459                  * try to target the entry on other stripes */
 460                 int stripe_index;
 461
 462                 for (stripe_index = 1;
 463                      stripe_index < lsm->lsm_md_stripe_count &&
 464                      it_disposition(it, DISP_LOOKUP_NEG); stripe_index++) {
 465                         struct lmv_oinfo *oinfo;
 466
 467                         /* release the previous request */
 468                         ptlrpc_req_finished(*reqp);
 469                         it->d.lustre.it_data = NULL;
 470                         *reqp = NULL;
 471
 472                         oinfo = &lsm->lsm_md_oinfo[stripe_index];
 473                         tgt = lmv_find_target(lmv, &oinfo->lmo_fid);
 474                         if (IS_ERR(tgt))
 475                                 RETURN(PTR_ERR(tgt));
 476
 477                         CDEBUG(D_INODE, "Try other stripes " DFID"\n",
 478                                PFID(&oinfo->lmo_fid));
 479
 480                         op_data->op_fid1 = oinfo->lmo_fid;
 481                         it->d.lustre.it_disposition &= ~DISP_ENQ_COMPLETE;
 482                         rc = md_intent_lock(tgt->ltd_exp, op_data, it, reqp,
 483                                             cb_blocking, extra_lock_flags);
 484                         if (rc != 0)
 485                                 RETURN(rc);
 486                 }
 487         }
 488
 489         /*
 490          * MDS has returned success. Probably name has been resolved in
 491          * remote inode. Let's check this.
 492          */
 493         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 494         if (body == NULL)
 495                 RETURN(-EPROTO);
 496
 497         /* Not cross-ref case, just get out of here. */
 498         if (unlikely((body->mbo_valid & OBD_MD_MDS))) {
 499                 rc = lmv_intent_remote(exp, it, NULL, reqp, cb_blocking,
 500                                        extra_lock_flags);
 501                 if (rc != 0)
 502                         RETURN(rc);
 503                 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 504                 if (body == NULL)
 505                         RETURN(-EPROTO);
 506         }
 507
 508         RETURN(rc);
 509 }
 510
 511 int lmv_intent_lock(struct obd_export *exp, struct md_op_data *op_data,
 512                     struct lookup_intent *it, struct ptlrpc_request **reqp,
 513                     ldlm_blocking_callback cb_blocking,
 514                     __u64 extra_lock_flags)
 515 {
 516         struct obd_device *obd = exp->exp_obd;
 517         int                rc;
 518         ENTRY;
 519
 520         LASSERT(it != NULL);
 521         LASSERT(fid_is_sane(&op_data->op_fid1));
 522
 523         CDEBUG(D_INODE, "INTENT LOCK '%s' for "DFID" '%.*s' on "DFID"\n",
 524                 LL_IT2STR(it), PFID(&op_data->op_fid2), op_data->op_namelen,
 525                 op_data->op_name, PFID(&op_data->op_fid1));
 526
 527         rc = lmv_check_connect(obd);
 528         if (rc)
 529                 RETURN(rc);
 530
 531         if (it->it_op & (IT_LOOKUP | IT_GETATTR | IT_LAYOUT))
 532                 rc = lmv_intent_lookup(exp, op_data, it, reqp, cb_blocking,
 533                                        extra_lock_flags);
 534         else if (it->it_op & IT_OPEN)
 535                 rc = lmv_intent_open(exp, op_data, it, reqp, cb_blocking,
 536                                      extra_lock_flags);
 537         else
 538                 LBUG();
 539
 540         RETURN(rc);
 541 }