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 <asm/div64.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 <obd_class.h>
  58 #include <lprocfs_status.h>
  59 #include "lmv_internal.h"
  60
  61 static int lmv_intent_remote(struct obd_export *exp, void *lmm,
  62                              int lmmsize, struct lookup_intent *it,
  63                              const struct lu_fid *parent_fid, int flags,
  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, lmm, lmmsize, it,
 130                             flags, &req, cb_blocking, 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         it->d.lustre.it_lock_handle = plock.cookie;
 146         it->d.lustre.it_lock_mode = pmode;
 147
 148         EXIT;
 149 out_free_op_data:
 150         OBD_FREE_PTR(op_data);
 151 out:
 152         if (rc && pmode)
 153                 ldlm_lock_decref(&plock, pmode);
 154
 155         ptlrpc_req_finished(*reqp);
 156         *reqp = req;
 157         return rc;
 158 }
 159
 160 #ifdef __KERNEL__
 161 int lmv_revalidate_slaves(struct obd_export *exp, struct mdt_body *mbody,
 162                           struct lmv_stripe_md *lsm,
 163                           ldlm_blocking_callback cb_blocking,
 164                           int extra_lock_flags)
 165 {
 166         struct obd_device      *obd = exp->exp_obd;
 167         struct lmv_obd         *lmv = &obd->u.lmv;
 168         struct mdt_body         *body;
 169         struct md_op_data      *op_data;
 170         unsigned long           size = 0;
 171         unsigned long           nlink = 0;
 172         obd_time                atime = 0;
 173         obd_time                ctime = 0;
 174         obd_time                mtime = 0;
 175         int                     i;
 176         int                     rc = 0;
 177
 178         ENTRY;
 179
 180         /**
 181          * revalidate slaves has some problems, temporarily return,
 182          * we may not need that
 183          */
 184         if (lsm->lsm_md_stripe_count <= 1)
 185                 RETURN(0);
 186
 187         OBD_ALLOC_PTR(op_data);
 188         if (op_data == NULL)
 189                 RETURN(-ENOMEM);
 190
 191         /**
 192          * Loop over the stripe information, check validity and update them
 193          * from MDS if needed.
 194          */
 195         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
 196                 struct lu_fid           fid;
 197                 struct lookup_intent    it = { .it_op = IT_GETATTR };
 198                 struct ptlrpc_request   *req = NULL;
 199                 struct lustre_handle    *lockh = NULL;
 200                 struct lmv_tgt_desc     *tgt = NULL;
 201                 struct inode            *inode;
 202
 203                 fid = lsm->lsm_md_oinfo[i].lmo_fid;
 204                 inode = lsm->lsm_md_oinfo[i].lmo_root;
 205                 if (i == 0) {
 206                         if (mbody != NULL) {
 207                                 body = mbody;
 208                                 goto update;
 209                         } else {
 210                                 goto release_lock;
 211                         }
 212                 }
 213
 214                 /*
 215                  * Prepare op_data for revalidating. Note that @fid2 shluld be
 216                  * defined otherwise it will go to server and take new lock
 217                  * which is not needed here.
 218                  */
 219                 memset(op_data, 0, sizeof(*op_data));
 220                 op_data->op_fid1 = fid;
 221                 op_data->op_fid2 = fid;
 222
 223                 tgt = lmv_locate_mds(lmv, op_data, &fid);
 224                 if (IS_ERR(tgt))
 225                         GOTO(cleanup, rc = PTR_ERR(tgt));
 226
 227                 CDEBUG(D_INODE, "Revalidate slave "DFID" -> mds #%d\n",
 228                        PFID(&fid), tgt->ltd_idx);
 229
 230                 rc = md_intent_lock(tgt->ltd_exp, op_data, NULL, 0, &it, 0,
 231                                     &req, cb_blocking, extra_lock_flags);
 232                 if (rc < 0)
 233                         GOTO(cleanup, rc);
 234
 235                 lockh = (struct lustre_handle *)&it.d.lustre.it_lock_handle;
 236                 if (rc > 0 && req == NULL) {
 237                         /* slave inode is still valid */
 238                         CDEBUG(D_INODE, "slave "DFID" is still valid.\n",
 239                                PFID(&fid));
 240                         rc = 0;
 241                 } else {
 242                         /* refresh slave from server */
 243                         body = req_capsule_server_get(&req->rq_pill,
 244                                                       &RMF_MDT_BODY);
 245                         LASSERT(body != NULL);
 246 update:
 247                         if (unlikely(body->nlink < 2)) {
 248                                 CERROR("%s: nlink %d < 2 corrupt stripe %d "DFID
 249                                        ":" DFID"\n", obd->obd_name, body->nlink,
 250                                        i, PFID(&lsm->lsm_md_oinfo[i].lmo_fid),
 251                                        PFID(&lsm->lsm_md_oinfo[0].lmo_fid));
 252
 253                                 if (req != NULL)
 254                                         ptlrpc_req_finished(req);
 255
 256                                 if (it.d.lustre.it_lock_mode && lockh) {
 257                                         ldlm_lock_decref(lockh,
 258                                                  it.d.lustre.it_lock_mode);
 259                                         it.d.lustre.it_lock_mode = 0;
 260                                 }
 261
 262                                 GOTO(cleanup, rc = -EIO);
 263                         }
 264
 265                         if (i != 0)
 266                                 md_set_lock_data(tgt->ltd_exp, &lockh->cookie,
 267                                                  inode, NULL);
 268
 269                         i_size_write(inode, body->size);
 270                         set_nlink(inode, body->nlink);
 271                         LTIME_S(inode->i_atime) = body->atime;
 272                         LTIME_S(inode->i_ctime) = body->ctime;
 273                         LTIME_S(inode->i_mtime) = body->mtime;
 274
 275                         if (req != NULL)
 276                                 ptlrpc_req_finished(req);
 277                 }
 278 release_lock:
 279                 size += i_size_read(inode);
 280
 281                 if (i != 0)
 282                         nlink += inode->i_nlink - 2;
 283                 else
 284                         nlink += inode->i_nlink;
 285
 286                 atime = LTIME_S(inode->i_atime) > atime ?
 287                                 LTIME_S(inode->i_atime) : atime;
 288                 ctime = LTIME_S(inode->i_ctime) > ctime ?
 289                                 LTIME_S(inode->i_ctime) : ctime;
 290                 mtime = LTIME_S(inode->i_mtime) > mtime ?
 291                                 LTIME_S(inode->i_mtime) : mtime;
 292
 293                 if (it.d.lustre.it_lock_mode != 0 && lockh != NULL) {
 294                         ldlm_lock_decref(lockh, it.d.lustre.it_lock_mode);
 295                         it.d.lustre.it_lock_mode = 0;
 296                 }
 297
 298                 CDEBUG(D_INODE, "i %d "DFID" size %llu, nlink %u, atime "
 299                        "%lu, mtime %lu, ctime %lu.\n", i, PFID(&fid),
 300                        i_size_read(inode), inode->i_nlink,
 301                        LTIME_S(inode->i_atime), LTIME_S(inode->i_mtime),
 302                        LTIME_S(inode->i_ctime));
 303         }
 304
 305         /*
 306          * update attr of master request.
 307          */
 308         CDEBUG(D_INODE, "Return refreshed attrs: size = %lu nlink %lu atime "
 309                LPU64 "ctime "LPU64" mtime "LPU64" for " DFID"\n", size, nlink,
 310                atime, ctime, mtime, PFID(&lsm->lsm_md_oinfo[0].lmo_fid));
 311
 312         if (mbody != NULL) {
 313                 mbody->atime = atime;
 314                 mbody->ctime = ctime;
 315                 mbody->mtime = mtime;
 316         }
 317 cleanup:
 318         OBD_FREE_PTR(op_data);
 319         RETURN(rc);
 320 }
 321
 322 #else
 323
 324 int lmv_revalidate_slaves(struct obd_export *exp, struct mdt_body *mbody,
 325                           struct lmv_stripe_md *lsm,
 326                           ldlm_blocking_callback cb_blocking,
 327                           int extra_lock_flags)
 328 {
 329         return 0;
 330 }
 331
 332 #endif
 333
 334 /*
 335  * IT_OPEN is intended to open (and create, possible) an object. Parent (pid)
 336  * may be split dir.
 337  */
 338 int lmv_intent_open(struct obd_export *exp, struct md_op_data *op_data,
 339                     void *lmm, int lmmsize, struct lookup_intent *it,
 340                     int flags, struct ptlrpc_request **reqp,
 341                     ldlm_blocking_callback cb_blocking,
 342                     __u64 extra_lock_flags)
 343 {
 344         struct obd_device       *obd = exp->exp_obd;
 345         struct lmv_obd          *lmv = &obd->u.lmv;
 346         struct lmv_tgt_desc     *tgt;
 347         struct mdt_body         *body;
 348         int                     rc;
 349         ENTRY;
 350
 351         /* Note: client might open with some random flags(sanity 33b), so we can
 352          * not make sure op_fid2 is being initialized with BY_FID flag */
 353         if (it->it_flags & MDS_OPEN_BY_FID && fid_is_sane(&op_data->op_fid2)) {
 354                 if (op_data->op_mea1 != NULL) {
 355                         struct lmv_stripe_md    *lsm = op_data->op_mea1;
 356                         const struct lmv_oinfo  *oinfo;
 357
 358                         oinfo = lsm_name_to_stripe_info(lsm, op_data->op_name,
 359                                                         op_data->op_namelen);
 360                         op_data->op_fid1 = oinfo->lmo_fid;
 361                 }
 362
 363                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
 364                 if (IS_ERR(tgt))
 365                         RETURN(PTR_ERR(tgt));
 366
 367                 op_data->op_mds = tgt->ltd_idx;
 368         } else {
 369                 tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
 370                 if (IS_ERR(tgt))
 371                         RETURN(PTR_ERR(tgt));
 372         }
 373
 374         /* If it is ready to open the file by FID, do not need
 375          * allocate FID at all, otherwise it will confuse MDT */
 376         if ((it->it_op & IT_CREAT) &&
 377             !(it->it_flags & MDS_OPEN_BY_FID)) {
 378                 /*
 379                  * For open with IT_CREATE and for IT_CREATE cases allocate new
 380                  * fid and setup FLD for it.
 381                  */
 382                 op_data->op_fid3 = op_data->op_fid2;
 383                 rc = lmv_fid_alloc(exp, &op_data->op_fid2, op_data);
 384                 if (rc != 0)
 385                         RETURN(rc);
 386         }
 387
 388         CDEBUG(D_INODE, "OPEN_INTENT with fid1="DFID", fid2="DFID","
 389                " name='%s' -> mds #%d\n", PFID(&op_data->op_fid1),
 390                PFID(&op_data->op_fid2), op_data->op_name, tgt->ltd_idx);
 391
 392         rc = md_intent_lock(tgt->ltd_exp, op_data, lmm, lmmsize, it, flags,
 393                             reqp, cb_blocking, extra_lock_flags);
 394         if (rc != 0)
 395                 RETURN(rc);
 396         /*
 397          * Nothing is found, do not access body->fid1 as it is zero and thus
 398          * pointless.
 399          */
 400         if ((it->d.lustre.it_disposition & DISP_LOOKUP_NEG) &&
 401             !(it->d.lustre.it_disposition & DISP_OPEN_CREATE) &&
 402             !(it->d.lustre.it_disposition & DISP_OPEN_OPEN))
 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         /* Not cross-ref case, just get out of here. */
 410         if (unlikely((body->valid & OBD_MD_MDS))) {
 411                 rc = lmv_intent_remote(exp, lmm, lmmsize, it, &op_data->op_fid1,
 412                                        flags, reqp, cb_blocking,
 413                                        extra_lock_flags);
 414                 if (rc != 0)
 415                         RETURN(rc);
 416
 417                 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 418                 if (body == NULL)
 419                         RETURN(-EPROTO);
 420         }
 421
 422         RETURN(rc);
 423 }
 424
 425 /*
 426  * Handler for: getattr, lookup and revalidate cases.
 427  */
 428 int lmv_intent_lookup(struct obd_export *exp, struct md_op_data *op_data,
 429                       void *lmm, int lmmsize, struct lookup_intent *it,
 430                       int flags, struct ptlrpc_request **reqp,
 431                       ldlm_blocking_callback cb_blocking,
 432                       __u64 extra_lock_flags)
 433 {
 434         struct obd_device      *obd = exp->exp_obd;
 435         struct lmv_obd         *lmv = &obd->u.lmv;
 436         struct lmv_tgt_desc    *tgt = NULL;
 437         struct mdt_body        *body;
 438         int                     rc = 0;
 439         ENTRY;
 440
 441         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
 442         if (IS_ERR(tgt))
 443                 RETURN(PTR_ERR(tgt));
 444
 445         if (!fid_is_sane(&op_data->op_fid2))
 446                 fid_zero(&op_data->op_fid2);
 447
 448         CDEBUG(D_INODE, "LOOKUP_INTENT with fid1="DFID", fid2="DFID
 449                ", name='%s' -> mds #%d\n", PFID(&op_data->op_fid1),
 450                PFID(&op_data->op_fid2),
 451                op_data->op_name ? op_data->op_name : "<NULL>",
 452                tgt->ltd_idx);
 453
 454         op_data->op_bias &= ~MDS_CROSS_REF;
 455
 456         rc = md_intent_lock(tgt->ltd_exp, op_data, lmm, lmmsize, it,
 457                              flags, reqp, cb_blocking, extra_lock_flags);
 458
 459         if (rc < 0)
 460                 RETURN(rc);
 461
 462         if (*reqp == NULL) {
 463                 /* If RPC happens, lsm information will be revalidated
 464                  * during update_inode process (see ll_update_lsm_md) */
 465                 if (op_data->op_mea2 != NULL) {
 466                         rc = lmv_revalidate_slaves(exp, NULL, op_data->op_mea2,
 467                                                 cb_blocking, extra_lock_flags);
 468                         if (rc != 0)
 469                                 RETURN(rc);
 470                 }
 471                 RETURN(rc);
 472         }
 473
 474         /*
 475          * MDS has returned success. Probably name has been resolved in
 476          * remote inode. Let's check this.
 477          */
 478         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 479         if (body == NULL)
 480                 RETURN(-EPROTO);
 481
 482         /* Not cross-ref case, just get out of here. */
 483         if (unlikely((body->valid & OBD_MD_MDS))) {
 484                 rc = lmv_intent_remote(exp, lmm, lmmsize, it, NULL, flags,
 485                                        reqp, cb_blocking, extra_lock_flags);
 486                 if (rc != 0)
 487                         RETURN(rc);
 488                 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 489                 if (body == NULL)
 490                         RETURN(-EPROTO);
 491         }
 492
 493         RETURN(rc);
 494 }
 495
 496 int lmv_intent_lock(struct obd_export *exp, struct md_op_data *op_data,
 497                     void *lmm, int lmmsize, struct lookup_intent *it,
 498                     int flags, struct ptlrpc_request **reqp,
 499                     ldlm_blocking_callback cb_blocking,
 500                     __u64 extra_lock_flags)
 501 {
 502         struct obd_device *obd = exp->exp_obd;
 503         int                rc;
 504         ENTRY;
 505
 506         LASSERT(it != NULL);
 507         LASSERT(fid_is_sane(&op_data->op_fid1));
 508
 509         CDEBUG(D_INODE, "INTENT LOCK '%s' for '%*s' on "DFID"\n",
 510                LL_IT2STR(it), op_data->op_namelen, op_data->op_name,
 511                PFID(&op_data->op_fid1));
 512
 513         rc = lmv_check_connect(obd);
 514         if (rc)
 515                 RETURN(rc);
 516
 517         if (it->it_op & (IT_LOOKUP | IT_GETATTR | IT_LAYOUT))
 518                 rc = lmv_intent_lookup(exp, op_data, lmm, lmmsize, it,
 519                                        flags, reqp, cb_blocking,
 520                                        extra_lock_flags);
 521         else if (it->it_op & IT_OPEN)
 522                 rc = lmv_intent_open(exp, op_data, lmm, lmmsize, it,
 523                                      flags, reqp, cb_blocking,
 524                                      extra_lock_flags);
 525         else
 526                 LBUG();
 527         RETURN(rc);
 528 }