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 #ifdef __KERNEL__
  39 #include <linux/slab.h>
  40 #include <linux/module.h>
  41 #include <linux/init.h>
  42 #include <linux/slab.h>
  43 #include <linux/pagemap.h>
  44 #include <linux/math64.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/namei.h>
  47 #include <linux/lustre_intent.h>
  48 #else
  49 #include <liblustre.h>
  50 #endif
  51
  52 #include <obd_support.h>
  53 #include <lustre/lustre_idl.h>
  54 #include <lustre_lib.h>
  55 #include <lustre_net.h>
  56 #include <lustre_dlm.h>
  57 #include <lustre_mdc.h>
  58 #include <obd_class.h>
  59 #include <lprocfs_status.h>
  60 #include "lmv_internal.h"
  61
  62 static int lmv_intent_remote(struct obd_export *exp, struct lookup_intent *it,
  63                              const struct lu_fid *parent_fid,
  64                              struct ptlrpc_request **reqp,
  65                              ldlm_blocking_callback cb_blocking,
  66                              __u64 extra_lock_flags)
  67 {
  68         struct obd_device       *obd = exp->exp_obd;
  69         struct lmv_obd          *lmv = &obd->u.lmv;
  70         struct ptlrpc_request   *req = NULL;
  71         struct lustre_handle    plock;
  72         struct md_op_data       *op_data;
  73         struct lmv_tgt_desc     *tgt;
  74         struct mdt_body         *body;
  75         int                     pmode;
  76         int                     rc = 0;
  77         ENTRY;
  78
  79         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
  80         if (body == NULL)
  81                 RETURN(-EPROTO);
  82
  83         LASSERT((body->valid & OBD_MD_MDS));
  84
  85         /*
  86          * Unfortunately, we have to lie to MDC/MDS to retrieve
  87          * attributes llite needs and provideproper locking.
  88          */
  89         if (it->it_op & IT_LOOKUP)
  90                 it->it_op = IT_GETATTR;
  91
  92         /*
  93          * We got LOOKUP lock, but we really need attrs.
  94          */
  95         pmode = it->d.lustre.it_lock_mode;
  96         if (pmode) {
  97                 plock.cookie = it->d.lustre.it_lock_handle;
  98                 it->d.lustre.it_lock_mode = 0;
  99                 it->d.lustre.it_data = NULL;
 100         }
 101
 102         LASSERT(fid_is_sane(&body->fid1));
 103
 104         tgt = lmv_find_target(lmv, &body->fid1);
 105         if (IS_ERR(tgt))
 106                 GOTO(out, rc = PTR_ERR(tgt));
 107
 108         OBD_ALLOC_PTR(op_data);
 109         if (op_data == NULL)
 110                 GOTO(out, rc = -ENOMEM);
 111
 112         op_data->op_fid1 = body->fid1;
 113         /* Sent the parent FID to the remote MDT */
 114         if (parent_fid != NULL) {
 115                 /* The parent fid is only for remote open to
 116                  * check whether the open is from OBF,
 117                  * see mdt_cross_open */
 118                 LASSERT(it->it_op & IT_OPEN);
 119                 op_data->op_fid2 = *parent_fid;
 120                 /* Add object FID to op_fid3, in case it needs to check stale
 121                  * (M_CHECK_STALE), see mdc_finish_intent_lock */
 122                 op_data->op_fid3 = body->fid1;
 123         }
 124
 125         op_data->op_bias = MDS_CROSS_REF;
 126         CDEBUG(D_INODE, "REMOTE_INTENT with fid="DFID" -> mds #%d\n",
 127                PFID(&body->fid1), tgt->ltd_idx);
 128
 129         rc = md_intent_lock(tgt->ltd_exp, op_data, it, &req, cb_blocking,
 130                             extra_lock_flags);
 131         if (rc)
 132                 GOTO(out_free_op_data, rc);
 133
 134         /*
 135          * LLite needs LOOKUP lock to track dentry revocation in order to
 136          * maintain dcache consistency. Thus drop UPDATE|PERM lock here
 137          * and put LOOKUP in request.
 138          */
 139         if (it->d.lustre.it_lock_mode != 0) {
 140                 it->d.lustre.it_remote_lock_handle =
 141                                         it->d.lustre.it_lock_handle;
 142                 it->d.lustre.it_remote_lock_mode = it->d.lustre.it_lock_mode;
 143         }
 144
 145         if (pmode) {
 146                 it->d.lustre.it_lock_handle = plock.cookie;
 147                 it->d.lustre.it_lock_mode = pmode;
 148         }
 149
 150         EXIT;
 151 out_free_op_data:
 152         OBD_FREE_PTR(op_data);
 153 out:
 154         if (rc && pmode)
 155                 ldlm_lock_decref(&plock, pmode);
 156
 157         ptlrpc_req_finished(*reqp);
 158         *reqp = req;
 159         return rc;
 160 }
 161
 162 #ifdef __KERNEL__
 163 int lmv_revalidate_slaves(struct obd_export *exp, struct mdt_body *mbody,
 164                           struct lmv_stripe_md *lsm,
 165                           ldlm_blocking_callback cb_blocking,
 166                           int extra_lock_flags)
 167 {
 168         struct obd_device      *obd = exp->exp_obd;
 169         struct lmv_obd         *lmv = &obd->u.lmv;
 170         struct mdt_body         *body;
 171         struct md_op_data      *op_data;
 172         unsigned long           size = 0;
 173         unsigned long           nlink = 0;
 174         obd_time                atime = 0;
 175         obd_time                ctime = 0;
 176         obd_time                mtime = 0;
 177         int                     i;
 178         int                     rc = 0;
 179
 180         ENTRY;
 181
 182         /**
 183          * revalidate slaves has some problems, temporarily return,
 184          * we may not need that
 185          */
 186         OBD_ALLOC_PTR(op_data);
 187         if (op_data == NULL)
 188                 RETURN(-ENOMEM);
 189
 190         /**
 191          * Loop over the stripe information, check validity and update them
 192          * from MDS if needed.
 193          */
 194         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
 195                 struct lu_fid           fid;
 196                 struct lookup_intent    it = { .it_op = IT_GETATTR };
 197                 struct ptlrpc_request   *req = NULL;
 198                 struct lustre_handle    *lockh = NULL;
 199                 struct lmv_tgt_desc     *tgt = NULL;
 200                 struct inode            *inode;
 201
 202                 fid = lsm->lsm_md_oinfo[i].lmo_fid;
 203                 inode = lsm->lsm_md_oinfo[i].lmo_root;
 204
 205                 /*
 206                  * Prepare op_data for revalidating. Note that @fid2 shluld be
 207                  * defined otherwise it will go to server and take new lock
 208                  * which is not needed here.
 209                  */
 210                 memset(op_data, 0, sizeof(*op_data));
 211                 op_data->op_fid1 = fid;
 212                 op_data->op_fid2 = fid;
 213
 214                 tgt = lmv_locate_mds(lmv, op_data, &fid);
 215                 if (IS_ERR(tgt))
 216                         GOTO(cleanup, rc = PTR_ERR(tgt));
 217
 218                 CDEBUG(D_INODE, "Revalidate slave "DFID" -> mds #%d\n",
 219                        PFID(&fid), tgt->ltd_idx);
 220
 221                 rc = md_intent_lock(tgt->ltd_exp, op_data, &it, &req,
 222                                     cb_blocking, extra_lock_flags);
 223                 if (rc < 0)
 224                         GOTO(cleanup, rc);
 225
 226                 lockh = (struct lustre_handle *)&it.d.lustre.it_lock_handle;
 227                 if (rc > 0 && req == NULL) {
 228                         /* slave inode is still valid */
 229                         CDEBUG(D_INODE, "slave "DFID" is still valid.\n",
 230                                PFID(&fid));
 231                         rc = 0;
 232                 } else {
 233                         /* refresh slave from server */
 234                         body = req_capsule_server_get(&req->rq_pill,
 235                                                       &RMF_MDT_BODY);
 236                         LASSERT(body != NULL);
 237                         if (unlikely(body->nlink < 2)) {
 238                                 CERROR("%s: nlink %d < 2 corrupt stripe %d "DFID
 239                                        ":" DFID"\n", obd->obd_name, body->nlink,
 240                                        i, PFID(&lsm->lsm_md_oinfo[i].lmo_fid),
 241                                        PFID(&lsm->lsm_md_oinfo[0].lmo_fid));
 242
 243                                 if (req != NULL)
 244                                         ptlrpc_req_finished(req);
 245
 246                                 if (it.d.lustre.it_lock_mode && lockh) {
 247                                         ldlm_lock_decref(lockh,
 248                                                  it.d.lustre.it_lock_mode);
 249                                         it.d.lustre.it_lock_mode = 0;
 250                                 }
 251
 252                                 GOTO(cleanup, rc = -EIO);
 253                         }
 254
 255
 256                         i_size_write(inode, body->size);
 257                         set_nlink(inode, body->nlink);
 258                         LTIME_S(inode->i_atime) = body->atime;
 259                         LTIME_S(inode->i_ctime) = body->ctime;
 260                         LTIME_S(inode->i_mtime) = body->mtime;
 261
 262                         if (req != NULL)
 263                                 ptlrpc_req_finished(req);
 264                 }
 265
 266                 md_set_lock_data(tgt->ltd_exp, &lockh->cookie, inode, NULL);
 267
 268                 size += i_size_read(inode);
 269
 270                 if (i != 0)
 271                         nlink += inode->i_nlink - 2;
 272                 else
 273                         nlink += inode->i_nlink;
 274
 275                 atime = LTIME_S(inode->i_atime) > atime ?
 276                                 LTIME_S(inode->i_atime) : atime;
 277                 ctime = LTIME_S(inode->i_ctime) > ctime ?
 278                                 LTIME_S(inode->i_ctime) : ctime;
 279                 mtime = LTIME_S(inode->i_mtime) > mtime ?
 280                                 LTIME_S(inode->i_mtime) : mtime;
 281
 282                 if (it.d.lustre.it_lock_mode != 0 && lockh != NULL) {
 283                         ldlm_lock_decref(lockh, it.d.lustre.it_lock_mode);
 284                         it.d.lustre.it_lock_mode = 0;
 285                 }
 286
 287                 CDEBUG(D_INODE, "i %d "DFID" size %llu, nlink %u, atime "
 288                        "%lu, mtime %lu, ctime %lu.\n", i, PFID(&fid),
 289                        i_size_read(inode), inode->i_nlink,
 290                        LTIME_S(inode->i_atime), LTIME_S(inode->i_mtime),
 291                        LTIME_S(inode->i_ctime));
 292         }
 293
 294         /*
 295          * update attr of master request.
 296          */
 297         CDEBUG(D_INODE, "Return refreshed attrs: size = %lu nlink %lu atime "
 298                LPU64 "ctime "LPU64" mtime "LPU64" for " DFID"\n", size, nlink,
 299                atime, ctime, mtime, PFID(&lsm->lsm_md_oinfo[0].lmo_fid));
 300
 301         if (mbody != NULL) {
 302                 mbody->atime = atime;
 303                 mbody->ctime = ctime;
 304                 mbody->mtime = mtime;
 305         }
 306 cleanup:
 307         OBD_FREE_PTR(op_data);
 308         RETURN(rc);
 309 }
 310
 311 #else
 312
 313 int lmv_revalidate_slaves(struct obd_export *exp, struct mdt_body *mbody,
 314                           struct lmv_stripe_md *lsm,
 315                           ldlm_blocking_callback cb_blocking,
 316                           int extra_lock_flags)
 317 {
 318         return 0;
 319 }
 320
 321 #endif
 322
 323 /*
 324  * IT_OPEN is intended to open (and create, possible) an object. Parent (pid)
 325  * may be split dir.
 326  */
 327 int lmv_intent_open(struct obd_export *exp, struct md_op_data *op_data,
 328                     struct lookup_intent *it, struct ptlrpc_request **reqp,
 329                     ldlm_blocking_callback cb_blocking, __u64 extra_lock_flags)
 330 {
 331         struct obd_device       *obd = exp->exp_obd;
 332         struct lmv_obd          *lmv = &obd->u.lmv;
 333         struct lmv_tgt_desc     *tgt;
 334         struct mdt_body         *body;
 335         int                     rc;
 336         ENTRY;
 337
 338         /* Note: client might open with some random flags(sanity 33b), so we can
 339          * not make sure op_fid2 is being initialized with BY_FID flag */
 340         if (it->it_flags & MDS_OPEN_BY_FID && fid_is_sane(&op_data->op_fid2)) {
 341                 if (op_data->op_mea1 != NULL) {
 342                         struct lmv_stripe_md    *lsm = op_data->op_mea1;
 343                         const struct lmv_oinfo  *oinfo;
 344
 345                         oinfo = lsm_name_to_stripe_info(lsm, op_data->op_name,
 346                                                         op_data->op_namelen);
 347                         if (IS_ERR(oinfo))
 348                                 RETURN(PTR_ERR(oinfo));
 349                         op_data->op_fid1 = oinfo->lmo_fid;
 350                 }
 351
 352                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
 353                 if (IS_ERR(tgt))
 354                         RETURN(PTR_ERR(tgt));
 355
 356                 op_data->op_mds = tgt->ltd_idx;
 357         } else {
 358                 tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
 359                 if (IS_ERR(tgt))
 360                         RETURN(PTR_ERR(tgt));
 361         }
 362
 363         /* If it is ready to open the file by FID, do not need
 364          * allocate FID at all, otherwise it will confuse MDT */
 365         if ((it->it_op & IT_CREAT) &&
 366             !(it->it_flags & MDS_OPEN_BY_FID)) {
 367                 /*
 368                  * For open with IT_CREATE and for IT_CREATE cases allocate new
 369                  * fid and setup FLD for it.
 370                  */
 371                 op_data->op_fid3 = op_data->op_fid2;
 372                 rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
 373                 if (rc != 0)
 374                         RETURN(rc);
 375         }
 376
 377         CDEBUG(D_INODE, "OPEN_INTENT with fid1="DFID", fid2="DFID","
 378                " name='%s' -> mds #%d\n", PFID(&op_data->op_fid1),
 379                PFID(&op_data->op_fid2), op_data->op_name, tgt->ltd_idx);
 380
 381         rc = md_intent_lock(tgt->ltd_exp, op_data, it, reqp, cb_blocking,
 382                             extra_lock_flags);
 383         if (rc != 0)
 384                 RETURN(rc);
 385         /*
 386          * Nothing is found, do not access body->fid1 as it is zero and thus
 387          * pointless.
 388          */
 389         if ((it->d.lustre.it_disposition & DISP_LOOKUP_NEG) &&
 390             !(it->d.lustre.it_disposition & DISP_OPEN_CREATE) &&
 391             !(it->d.lustre.it_disposition & DISP_OPEN_OPEN))
 392                 RETURN(rc);
 393
 394         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 395         if (body == NULL)
 396                 RETURN(-EPROTO);
 397
 398         /* Not cross-ref case, just get out of here. */
 399         if (unlikely((body->valid & OBD_MD_MDS))) {
 400                 rc = lmv_intent_remote(exp, it, &op_data->op_fid1, reqp,
 401                                        cb_blocking, extra_lock_flags);
 402                 if (rc != 0)
 403                         RETURN(rc);
 404
 405                 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 406                 if (body == NULL)
 407                         RETURN(-EPROTO);
 408         }
 409
 410         RETURN(rc);
 411 }
 412
 413 /*
 414  * Handler for: getattr, lookup and revalidate cases.
 415  */
 416 static int
 417 lmv_intent_lookup(struct obd_export *exp, struct md_op_data *op_data,
 418                   struct lookup_intent *it, struct ptlrpc_request **reqp,
 419                   ldlm_blocking_callback cb_blocking,
 420                   __u64 extra_lock_flags)
 421 {
 422         struct obd_device       *obd = exp->exp_obd;
 423         struct lmv_obd          *lmv = &obd->u.lmv;
 424         struct lmv_tgt_desc     *tgt = NULL;
 425         struct mdt_body         *body;
 426         struct lmv_stripe_md    *lsm = op_data->op_mea1;
 427         int                     rc = 0;
 428         ENTRY;
 429
 430         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
 431         if (IS_ERR(tgt))
 432                 RETURN(PTR_ERR(tgt));
 433
 434         if (!fid_is_sane(&op_data->op_fid2))
 435                 fid_zero(&op_data->op_fid2);
 436
 437         CDEBUG(D_INODE, "LOOKUP_INTENT with fid1="DFID", fid2="DFID
 438                ", name='%s' -> mds #%d lsm=%p lsm_magic=%x\n",
 439                PFID(&op_data->op_fid1), PFID(&op_data->op_fid2),
 440                op_data->op_name ? op_data->op_name : "<NULL>",
 441                tgt->ltd_idx, lsm, lsm == NULL ? -1 : lsm->lsm_md_magic);
 442
 443         op_data->op_bias &= ~MDS_CROSS_REF;
 444
 445         rc = md_intent_lock(tgt->ltd_exp, op_data, it, reqp, cb_blocking,
 446                             extra_lock_flags);
 447         if (rc < 0)
 448                 RETURN(rc);
 449
 450         if (*reqp == NULL) {
 451                 /* If RPC happens, lsm information will be revalidated
 452                  * during update_inode process (see ll_update_lsm_md) */
 453                 if (op_data->op_mea2 != NULL) {
 454                         rc = lmv_revalidate_slaves(exp, NULL, op_data->op_mea2,
 455                                                    cb_blocking,
 456                                                    extra_lock_flags);
 457                         if (rc != 0)
 458                                 RETURN(rc);
 459                 }
 460                 RETURN(rc);
 461         } else if (it_disposition(it, DISP_LOOKUP_NEG) && lsm != NULL &&
 462                    lsm->lsm_md_hash_type & LMV_HASH_FLAG_MIGRATION) {
 463                 /* For migrating directory, if it can not find the child in
 464                  * the source directory(master stripe), try the targeting
 465                  * directory(stripe 1) */
 466                 tgt = lmv_find_target(lmv, &lsm->lsm_md_oinfo[1].lmo_fid);
 467                 if (IS_ERR(tgt))
 468                         RETURN(PTR_ERR(tgt));
 469
 470                 ptlrpc_req_finished(*reqp);
 471                 it->d.lustre.it_data = NULL;
 472                 *reqp = NULL;
 473
 474                 CDEBUG(D_INODE, "For migrating dir, try target dir "DFID"\n",
 475                        PFID(&lsm->lsm_md_oinfo[1].lmo_fid));
 476
 477                 op_data->op_fid1 = lsm->lsm_md_oinfo[1].lmo_fid;
 478                 it->d.lustre.it_disposition &= ~DISP_ENQ_COMPLETE;
 479                 rc = md_intent_lock(tgt->ltd_exp, op_data, it, reqp,
 480                                     cb_blocking, extra_lock_flags);
 481         }
 482         /*
 483          * MDS has returned success. Probably name has been resolved in
 484          * remote inode. Let's check this.
 485          */
 486         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 487         if (body == NULL)
 488                 RETURN(-EPROTO);
 489
 490         /* Not cross-ref case, just get out of here. */
 491         if (unlikely((body->valid & OBD_MD_MDS))) {
 492                 rc = lmv_intent_remote(exp, it, NULL, reqp, cb_blocking,
 493                                        extra_lock_flags);
 494                 if (rc != 0)
 495                         RETURN(rc);
 496                 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 497                 if (body == NULL)
 498                         RETURN(-EPROTO);
 499         }
 500
 501         RETURN(rc);
 502 }
 503
 504 int lmv_intent_lock(struct obd_export *exp, struct md_op_data *op_data,
 505                     struct lookup_intent *it, struct ptlrpc_request **reqp,
 506                     ldlm_blocking_callback cb_blocking,
 507                     __u64 extra_lock_flags)
 508 {
 509         struct obd_device *obd = exp->exp_obd;
 510         int                rc;
 511         ENTRY;
 512
 513         LASSERT(it != NULL);
 514         LASSERT(fid_is_sane(&op_data->op_fid1));
 515
 516         CDEBUG(D_INODE, "INTENT LOCK '%s' for '%*s' on "DFID"\n",
 517                LL_IT2STR(it), op_data->op_namelen, op_data->op_name,
 518                PFID(&op_data->op_fid1));
 519
 520         rc = lmv_check_connect(obd);
 521         if (rc)
 522                 RETURN(rc);
 523
 524         if (it->it_op & (IT_LOOKUP | IT_GETATTR | IT_LAYOUT))
 525                 rc = lmv_intent_lookup(exp, op_data, it, reqp, cb_blocking,
 526                                        extra_lock_flags);
 527         else if (it->it_op & IT_OPEN)
 528                 rc = lmv_intent_open(exp, op_data, it, reqp, cb_blocking,
 529                                      extra_lock_flags);
 530         else
 531                 LBUG();
 532
 533         RETURN(rc);
 534 }