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, void *lmm,
  63                              int lmmsize, struct lookup_intent *it,
  64                              const struct lu_fid *parent_fid, int flags,
  65                              struct ptlrpc_request **reqp,
  66                              ldlm_blocking_callback cb_blocking,
  67                              __u64 extra_lock_flags)
  68 {
  69         struct obd_device       *obd = exp->exp_obd;
  70         struct lmv_obd          *lmv = &obd->u.lmv;
  71         struct ptlrpc_request   *req = NULL;
  72         struct lustre_handle    plock;
  73         struct md_op_data       *op_data;
  74         struct lmv_tgt_desc     *tgt;
  75         struct mdt_body         *body;
  76         int                     pmode;
  77         int                     rc = 0;
  78         ENTRY;
  79
  80         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
  81         if (body == NULL)
  82                 RETURN(-EPROTO);
  83
  84         LASSERT((body->valid & OBD_MD_MDS));
  85
  86         /*
  87          * Unfortunately, we have to lie to MDC/MDS to retrieve
  88          * attributes llite needs and provideproper locking.
  89          */
  90         if (it->it_op & IT_LOOKUP)
  91                 it->it_op = IT_GETATTR;
  92
  93         /*
  94          * We got LOOKUP lock, but we really need attrs.
  95          */
  96         pmode = it->d.lustre.it_lock_mode;
  97         if (pmode) {
  98                 plock.cookie = it->d.lustre.it_lock_handle;
  99                 it->d.lustre.it_lock_mode = 0;
 100                 it->d.lustre.it_data = NULL;
 101         }
 102
 103         LASSERT(fid_is_sane(&body->fid1));
 104
 105         tgt = lmv_find_target(lmv, &body->fid1);
 106         if (IS_ERR(tgt))
 107                 GOTO(out, rc = PTR_ERR(tgt));
 108
 109         OBD_ALLOC_PTR(op_data);
 110         if (op_data == NULL)
 111                 GOTO(out, rc = -ENOMEM);
 112
 113         op_data->op_fid1 = body->fid1;
 114         /* Sent the parent FID to the remote MDT */
 115         if (parent_fid != NULL) {
 116                 /* The parent fid is only for remote open to
 117                  * check whether the open is from OBF,
 118                  * see mdt_cross_open */
 119                 LASSERT(it->it_op & IT_OPEN);
 120                 op_data->op_fid2 = *parent_fid;
 121                 /* Add object FID to op_fid3, in case it needs to check stale
 122                  * (M_CHECK_STALE), see mdc_finish_intent_lock */
 123                 op_data->op_fid3 = body->fid1;
 124         }
 125
 126         op_data->op_bias = MDS_CROSS_REF;
 127         CDEBUG(D_INODE, "REMOTE_INTENT with fid="DFID" -> mds #%d\n",
 128                PFID(&body->fid1), tgt->ltd_idx);
 129
 130         rc = md_intent_lock(tgt->ltd_exp, op_data, lmm, lmmsize, it,
 131                             flags, &req, cb_blocking, extra_lock_flags);
 132         if (rc)
 133                 GOTO(out_free_op_data, rc);
 134
 135         /*
 136          * LLite needs LOOKUP lock to track dentry revocation in order to
 137          * maintain dcache consistency. Thus drop UPDATE|PERM lock here
 138          * and put LOOKUP in request.
 139          */
 140         if (it->d.lustre.it_lock_mode != 0) {
 141                 it->d.lustre.it_remote_lock_handle =
 142                                         it->d.lustre.it_lock_handle;
 143                 it->d.lustre.it_remote_lock_mode = it->d.lustre.it_lock_mode;
 144         }
 145
 146         if (pmode) {
 147                 it->d.lustre.it_lock_handle = plock.cookie;
 148                 it->d.lustre.it_lock_mode = pmode;
 149         }
 150
 151         EXIT;
 152 out_free_op_data:
 153         OBD_FREE_PTR(op_data);
 154 out:
 155         if (rc && pmode)
 156                 ldlm_lock_decref(&plock, pmode);
 157
 158         ptlrpc_req_finished(*reqp);
 159         *reqp = req;
 160         return rc;
 161 }
 162
 163 #ifdef __KERNEL__
 164 int lmv_revalidate_slaves(struct obd_export *exp, struct mdt_body *mbody,
 165                           struct lmv_stripe_md *lsm,
 166                           ldlm_blocking_callback cb_blocking,
 167                           int extra_lock_flags)
 168 {
 169         struct obd_device      *obd = exp->exp_obd;
 170         struct lmv_obd         *lmv = &obd->u.lmv;
 171         struct mdt_body         *body;
 172         struct md_op_data      *op_data;
 173         unsigned long           size = 0;
 174         unsigned long           nlink = 0;
 175         obd_time                atime = 0;
 176         obd_time                ctime = 0;
 177         obd_time                mtime = 0;
 178         int                     i;
 179         int                     rc = 0;
 180
 181         ENTRY;
 182
 183         /**
 184          * revalidate slaves has some problems, temporarily return,
 185          * we may not need that
 186          */
 187         if (lsm->lsm_md_stripe_count <= 1)
 188                 RETURN(0);
 189
 190         OBD_ALLOC_PTR(op_data);
 191         if (op_data == NULL)
 192                 RETURN(-ENOMEM);
 193
 194         /**
 195          * Loop over the stripe information, check validity and update them
 196          * from MDS if needed.
 197          */
 198         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
 199                 struct lu_fid           fid;
 200                 struct lookup_intent    it = { .it_op = IT_GETATTR };
 201                 struct ptlrpc_request   *req = NULL;
 202                 struct lustre_handle    *lockh = NULL;
 203                 struct lmv_tgt_desc     *tgt = NULL;
 204                 struct inode            *inode;
 205
 206                 fid = lsm->lsm_md_oinfo[i].lmo_fid;
 207                 inode = lsm->lsm_md_oinfo[i].lmo_root;
 208                 if (i == 0) {
 209                         if (mbody != NULL) {
 210                                 body = mbody;
 211                                 goto update;
 212                         } else {
 213                                 goto release_lock;
 214                         }
 215                 }
 216
 217                 /*
 218                  * Prepare op_data for revalidating. Note that @fid2 shluld be
 219                  * defined otherwise it will go to server and take new lock
 220                  * which is not needed here.
 221                  */
 222                 memset(op_data, 0, sizeof(*op_data));
 223                 op_data->op_fid1 = fid;
 224                 op_data->op_fid2 = fid;
 225
 226                 tgt = lmv_locate_mds(lmv, op_data, &fid);
 227                 if (IS_ERR(tgt))
 228                         GOTO(cleanup, rc = PTR_ERR(tgt));
 229
 230                 CDEBUG(D_INODE, "Revalidate slave "DFID" -> mds #%d\n",
 231                        PFID(&fid), tgt->ltd_idx);
 232
 233                 rc = md_intent_lock(tgt->ltd_exp, op_data, NULL, 0, &it, 0,
 234                                     &req, cb_blocking, extra_lock_flags);
 235                 if (rc < 0)
 236                         GOTO(cleanup, rc);
 237
 238                 lockh = (struct lustre_handle *)&it.d.lustre.it_lock_handle;
 239                 if (rc > 0 && req == NULL) {
 240                         /* slave inode is still valid */
 241                         CDEBUG(D_INODE, "slave "DFID" is still valid.\n",
 242                                PFID(&fid));
 243                         rc = 0;
 244                 } else {
 245                         /* refresh slave from server */
 246                         body = req_capsule_server_get(&req->rq_pill,
 247                                                       &RMF_MDT_BODY);
 248                         LASSERT(body != NULL);
 249 update:
 250                         if (unlikely(body->nlink < 2)) {
 251                                 CERROR("%s: nlink %d < 2 corrupt stripe %d "DFID
 252                                        ":" DFID"\n", obd->obd_name, body->nlink,
 253                                        i, PFID(&lsm->lsm_md_oinfo[i].lmo_fid),
 254                                        PFID(&lsm->lsm_md_oinfo[0].lmo_fid));
 255
 256                                 if (req != NULL)
 257                                         ptlrpc_req_finished(req);
 258
 259                                 if (it.d.lustre.it_lock_mode && lockh) {
 260                                         ldlm_lock_decref(lockh,
 261                                                  it.d.lustre.it_lock_mode);
 262                                         it.d.lustre.it_lock_mode = 0;
 263                                 }
 264
 265                                 GOTO(cleanup, rc = -EIO);
 266                         }
 267
 268                         if (i != 0)
 269                                 md_set_lock_data(tgt->ltd_exp, &lockh->cookie,
 270                                                  inode, NULL);
 271
 272                         i_size_write(inode, body->size);
 273                         set_nlink(inode, body->nlink);
 274                         LTIME_S(inode->i_atime) = body->atime;
 275                         LTIME_S(inode->i_ctime) = body->ctime;
 276                         LTIME_S(inode->i_mtime) = body->mtime;
 277
 278                         if (req != NULL)
 279                                 ptlrpc_req_finished(req);
 280                 }
 281 release_lock:
 282                 size += i_size_read(inode);
 283
 284                 if (i != 0)
 285                         nlink += inode->i_nlink - 2;
 286                 else
 287                         nlink += inode->i_nlink;
 288
 289                 atime = LTIME_S(inode->i_atime) > atime ?
 290                                 LTIME_S(inode->i_atime) : atime;
 291                 ctime = LTIME_S(inode->i_ctime) > ctime ?
 292                                 LTIME_S(inode->i_ctime) : ctime;
 293                 mtime = LTIME_S(inode->i_mtime) > mtime ?
 294                                 LTIME_S(inode->i_mtime) : mtime;
 295
 296                 if (it.d.lustre.it_lock_mode != 0 && lockh != NULL) {
 297                         ldlm_lock_decref(lockh, it.d.lustre.it_lock_mode);
 298                         it.d.lustre.it_lock_mode = 0;
 299                 }
 300
 301                 CDEBUG(D_INODE, "i %d "DFID" size %llu, nlink %u, atime "
 302                        "%lu, mtime %lu, ctime %lu.\n", i, PFID(&fid),
 303                        i_size_read(inode), inode->i_nlink,
 304                        LTIME_S(inode->i_atime), LTIME_S(inode->i_mtime),
 305                        LTIME_S(inode->i_ctime));
 306         }
 307
 308         /*
 309          * update attr of master request.
 310          */
 311         CDEBUG(D_INODE, "Return refreshed attrs: size = %lu nlink %lu atime "
 312                LPU64 "ctime "LPU64" mtime "LPU64" for " DFID"\n", size, nlink,
 313                atime, ctime, mtime, PFID(&lsm->lsm_md_oinfo[0].lmo_fid));
 314
 315         if (mbody != NULL) {
 316                 mbody->atime = atime;
 317                 mbody->ctime = ctime;
 318                 mbody->mtime = mtime;
 319         }
 320 cleanup:
 321         OBD_FREE_PTR(op_data);
 322         RETURN(rc);
 323 }
 324
 325 #else
 326
 327 int lmv_revalidate_slaves(struct obd_export *exp, struct mdt_body *mbody,
 328                           struct lmv_stripe_md *lsm,
 329                           ldlm_blocking_callback cb_blocking,
 330                           int extra_lock_flags)
 331 {
 332         return 0;
 333 }
 334
 335 #endif
 336
 337 /*
 338  * IT_OPEN is intended to open (and create, possible) an object. Parent (pid)
 339  * may be split dir.
 340  */
 341 int lmv_intent_open(struct obd_export *exp, struct md_op_data *op_data,
 342                     void *lmm, int lmmsize, struct lookup_intent *it,
 343                     int flags, struct ptlrpc_request **reqp,
 344                     ldlm_blocking_callback cb_blocking,
 345                     __u64 extra_lock_flags)
 346 {
 347         struct obd_device       *obd = exp->exp_obd;
 348         struct lmv_obd          *lmv = &obd->u.lmv;
 349         struct lmv_tgt_desc     *tgt;
 350         struct mdt_body         *body;
 351         int                     rc;
 352         ENTRY;
 353
 354         /* Note: client might open with some random flags(sanity 33b), so we can
 355          * not make sure op_fid2 is being initialized with BY_FID flag */
 356         if (it->it_flags & MDS_OPEN_BY_FID && fid_is_sane(&op_data->op_fid2)) {
 357                 if (op_data->op_mea1 != NULL) {
 358                         struct lmv_stripe_md    *lsm = op_data->op_mea1;
 359                         const struct lmv_oinfo  *oinfo;
 360
 361                         oinfo = lsm_name_to_stripe_info(lsm, op_data->op_name,
 362                                                         op_data->op_namelen);
 363                         if (IS_ERR(oinfo))
 364                                 RETURN(PTR_ERR(oinfo));
 365                         op_data->op_fid1 = oinfo->lmo_fid;
 366                 }
 367
 368                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
 369                 if (IS_ERR(tgt))
 370                         RETURN(PTR_ERR(tgt));
 371
 372                 op_data->op_mds = tgt->ltd_idx;
 373         } else {
 374                 tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
 375                 if (IS_ERR(tgt))
 376                         RETURN(PTR_ERR(tgt));
 377         }
 378
 379         /* If it is ready to open the file by FID, do not need
 380          * allocate FID at all, otherwise it will confuse MDT */
 381         if ((it->it_op & IT_CREAT) &&
 382             !(it->it_flags & MDS_OPEN_BY_FID)) {
 383                 /*
 384                  * For open with IT_CREATE and for IT_CREATE cases allocate new
 385                  * fid and setup FLD for it.
 386                  */
 387                 op_data->op_fid3 = op_data->op_fid2;
 388                 rc = lmv_fid_alloc(exp, &op_data->op_fid2, op_data);
 389                 if (rc != 0)
 390                         RETURN(rc);
 391         }
 392
 393         CDEBUG(D_INODE, "OPEN_INTENT with fid1="DFID", fid2="DFID","
 394                " name='%s' -> mds #%d\n", PFID(&op_data->op_fid1),
 395                PFID(&op_data->op_fid2), op_data->op_name, tgt->ltd_idx);
 396
 397         rc = md_intent_lock(tgt->ltd_exp, op_data, lmm, lmmsize, it, flags,
 398                             reqp, cb_blocking, extra_lock_flags);
 399         if (rc != 0)
 400                 RETURN(rc);
 401         /*
 402          * Nothing is found, do not access body->fid1 as it is zero and thus
 403          * pointless.
 404          */
 405         if ((it->d.lustre.it_disposition & DISP_LOOKUP_NEG) &&
 406             !(it->d.lustre.it_disposition & DISP_OPEN_CREATE) &&
 407             !(it->d.lustre.it_disposition & DISP_OPEN_OPEN))
 408                 RETURN(rc);
 409
 410         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 411         if (body == NULL)
 412                 RETURN(-EPROTO);
 413
 414         /* Not cross-ref case, just get out of here. */
 415         if (unlikely((body->valid & OBD_MD_MDS))) {
 416                 rc = lmv_intent_remote(exp, lmm, lmmsize, it, &op_data->op_fid1,
 417                                        flags, reqp, cb_blocking,
 418                                        extra_lock_flags);
 419                 if (rc != 0)
 420                         RETURN(rc);
 421
 422                 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 423                 if (body == NULL)
 424                         RETURN(-EPROTO);
 425         }
 426
 427         RETURN(rc);
 428 }
 429
 430 /*
 431  * Handler for: getattr, lookup and revalidate cases.
 432  */
 433 int lmv_intent_lookup(struct obd_export *exp, struct md_op_data *op_data,
 434                       void *lmm, int lmmsize, struct lookup_intent *it,
 435                       int flags, struct ptlrpc_request **reqp,
 436                       ldlm_blocking_callback cb_blocking,
 437                       __u64 extra_lock_flags)
 438 {
 439         struct obd_device       *obd = exp->exp_obd;
 440         struct lmv_obd          *lmv = &obd->u.lmv;
 441         struct lmv_tgt_desc     *tgt = NULL;
 442         struct mdt_body         *body;
 443         struct lmv_stripe_md    *lsm = op_data->op_mea1;
 444         int                     rc = 0;
 445         ENTRY;
 446
 447         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
 448         if (IS_ERR(tgt))
 449                 RETURN(PTR_ERR(tgt));
 450
 451         if (!fid_is_sane(&op_data->op_fid2))
 452                 fid_zero(&op_data->op_fid2);
 453
 454         CDEBUG(D_INODE, "LOOKUP_INTENT with fid1="DFID", fid2="DFID
 455                ", name='%s' -> mds #%d lsm=%p lsm_magic=%x\n",
 456                PFID(&op_data->op_fid1), PFID(&op_data->op_fid2),
 457                op_data->op_name ? op_data->op_name : "<NULL>",
 458                tgt->ltd_idx, lsm, lsm == NULL ? -1 : lsm->lsm_md_magic);
 459
 460         op_data->op_bias &= ~MDS_CROSS_REF;
 461
 462         rc = md_intent_lock(tgt->ltd_exp, op_data, lmm, lmmsize, it,
 463                              flags, reqp, cb_blocking, extra_lock_flags);
 464         if (rc < 0)
 465                 RETURN(rc);
 466
 467         if (*reqp == NULL) {
 468                 /* If RPC happens, lsm information will be revalidated
 469                  * during update_inode process (see ll_update_lsm_md) */
 470                 if (op_data->op_mea2 != NULL) {
 471                         rc = lmv_revalidate_slaves(exp, NULL, op_data->op_mea2,
 472                                                    cb_blocking,
 473                                                    extra_lock_flags);
 474                         if (rc != 0)
 475                                 RETURN(rc);
 476                 }
 477                 RETURN(rc);
 478         } else if (it_disposition(it, DISP_LOOKUP_NEG) &&
 479                    lsm != NULL && lsm->lsm_md_magic == LMV_MAGIC_MIGRATE) {
 480                 /* For migrating directory, if it can not find the child in
 481                  * the source directory(master stripe), try the targeting
 482                  * directory(stripe 1) */
 483                 tgt = lmv_find_target(lmv, &lsm->lsm_md_oinfo[1].lmo_fid);
 484                 if (IS_ERR(tgt))
 485                         RETURN(PTR_ERR(tgt));
 486
 487                 ptlrpc_req_finished(*reqp);
 488                 it->d.lustre.it_data = NULL;
 489                 *reqp = NULL;
 490
 491                 CDEBUG(D_INODE, "For migrating dir, try target dir "DFID"\n",
 492                        PFID(&lsm->lsm_md_oinfo[1].lmo_fid));
 493
 494                 op_data->op_fid1 = lsm->lsm_md_oinfo[1].lmo_fid;
 495                 it->d.lustre.it_disposition &= ~DISP_ENQ_COMPLETE;
 496                 rc = md_intent_lock(tgt->ltd_exp, op_data, lmm, lmmsize, it,
 497                                     flags, reqp, cb_blocking, extra_lock_flags);
 498         }
 499         /*
 500          * MDS has returned success. Probably name has been resolved in
 501          * remote inode. Let's check this.
 502          */
 503         body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 504         if (body == NULL)
 505                 RETURN(-EPROTO);
 506
 507         /* Not cross-ref case, just get out of here. */
 508         if (unlikely((body->valid & OBD_MD_MDS))) {
 509                 rc = lmv_intent_remote(exp, lmm, lmmsize, it, NULL, flags,
 510                                        reqp, cb_blocking, extra_lock_flags);
 511                 if (rc != 0)
 512                         RETURN(rc);
 513                 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
 514                 if (body == NULL)
 515                         RETURN(-EPROTO);
 516         }
 517
 518         RETURN(rc);
 519 }
 520
 521 int lmv_intent_lock(struct obd_export *exp, struct md_op_data *op_data,
 522                     void *lmm, int lmmsize, struct lookup_intent *it,
 523                     int flags, struct ptlrpc_request **reqp,
 524                     ldlm_blocking_callback cb_blocking,
 525                     __u64 extra_lock_flags)
 526 {
 527         struct obd_device *obd = exp->exp_obd;
 528         int                rc;
 529         ENTRY;
 530
 531         LASSERT(it != NULL);
 532         LASSERT(fid_is_sane(&op_data->op_fid1));
 533
 534         CDEBUG(D_INODE, "INTENT LOCK '%s' for '%*s' on "DFID"\n",
 535                LL_IT2STR(it), op_data->op_namelen, op_data->op_name,
 536                PFID(&op_data->op_fid1));
 537
 538         rc = lmv_check_connect(obd);
 539         if (rc)
 540                 RETURN(rc);
 541
 542         if (it->it_op & (IT_LOOKUP | IT_GETATTR | IT_LAYOUT))
 543                 rc = lmv_intent_lookup(exp, op_data, lmm, lmmsize, it,
 544                                        flags, reqp, cb_blocking,
 545                                        extra_lock_flags);
 546         else if (it->it_op & IT_OPEN)
 547                 rc = lmv_intent_open(exp, op_data, lmm, lmmsize, it,
 548                                      flags, reqp, cb_blocking,
 549                                      extra_lock_flags);
 550         else
 551                 LBUG();
 552         RETURN(rc);
 553 }