lustre/mds/mds_open.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (c) 2003 Cluster File Systems, Inc.
   5  *   Author: Peter Braam <braam@clusterfs.com>
   6  *   Author: Andreas Dilger <adilger@clusterfs.com>
   7  *   Author: Phil Schwan <phil@clusterfs.com>
   8  *   Author: Mike Shaver <shaver@clusterfs.com>
   9  *
  10  *   This file is part of Lustre, http://www.lustre.org.
  11  *
  12  *   Lustre is free software; you can redistribute it and/or
  13  *   modify it under the terms of version 2 of the GNU General Public
  14  *   License as published by the Free Software Foundation.
  15  *
  16  *   Lustre is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *   GNU General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU General Public License
  22  *   along with Lustre; if not, write to the Free Software
  23  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 #ifndef EXPORT_SYMTAB
  27 # define EXPORT_SYMTAB
  28 #endif
  29 #define DEBUG_SUBSYSTEM S_MDS
  30
  31 #include <linux/version.h>
  32 #include <linux/module.h>
  33 #include <linux/init.h>
  34 #include <linux/version.h>
  35 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
  36 # include <linux/buffer_head.h>
  37 # include <linux/workqueue.h>
  38 #else
  39 # include <linux/locks.h>
  40 #endif
  41
  42 #include <linux/obd_class.h>
  43 #include <linux/obd_lov.h>
  44 #include <linux/lustre_fsfilt.h>
  45 #include <linux/lprocfs_status.h>
  46
  47 #include "mds_internal.h"
  48
  49 /* Exported function from this file are:
  50  *
  51  * mds_open - called by the intent handler
  52  * mds_close - an rpc handling function
  53  * mds_pin - an rpc handling function - which will go away
  54  * mds_mfd_close - for force closing files when a client dies
  55  */
  56
  57 /*
  58  * MDS file data handling: file data holds a handle for a file opened
  59  * by a client.
  60  */
  61
  62 static void mds_mfd_addref(void *mfdp)
  63 {
  64         struct mds_file_data *mfd = mfdp;
  65
  66         atomic_inc(&mfd->mfd_refcount);
  67         CDEBUG(D_INFO, "GETting mfd %p : new refcount %d\n", mfd,
  68                atomic_read(&mfd->mfd_refcount));
  69 }
  70
  71 struct mds_file_data *mds_mfd_new(void)
  72 {
  73         struct mds_file_data *mfd;
  74
  75         OBD_ALLOC(mfd, sizeof *mfd);
  76         if (mfd == NULL) {
  77                 CERROR("mds: out of memory\n");
  78                 return NULL;
  79         }
  80
  81         atomic_set(&mfd->mfd_refcount, 2);
  82
  83         INIT_LIST_HEAD(&mfd->mfd_handle.h_link);
  84         class_handle_hash(&mfd->mfd_handle, mds_mfd_addref);
  85
  86         return mfd;
  87 }
  88
  89 static struct mds_file_data *mds_handle2mfd(struct lustre_handle *handle)
  90 {
  91         ENTRY;
  92         LASSERT(handle != NULL);
  93         RETURN(class_handle2object(handle->cookie));
  94 }
  95
  96 static void mds_mfd_put(struct mds_file_data *mfd)
  97 {
  98         CDEBUG(D_INFO, "PUTting mfd %p : new refcount %d\n", mfd,
  99                atomic_read(&mfd->mfd_refcount) - 1);
 100         LASSERT(atomic_read(&mfd->mfd_refcount) > 0 &&
 101                 atomic_read(&mfd->mfd_refcount) < 0x5a5a);
 102         if (atomic_dec_and_test(&mfd->mfd_refcount)) {
 103                 LASSERT(list_empty(&mfd->mfd_handle.h_link));
 104                 OBD_FREE(mfd, sizeof *mfd);
 105         }
 106 }
 107
 108 static void mds_mfd_destroy(struct mds_file_data *mfd)
 109 {
 110         class_handle_unhash(&mfd->mfd_handle);
 111         mds_mfd_put(mfd);
 112 }
 113
 114 #ifdef IFILTERDATA_ACTUALLY_USED
 115 /* Caller must hold mds->mds_epoch_sem */
 116 static int mds_alloc_filterdata(struct inode *inode)
 117 {
 118         LASSERT(inode->i_filterdata == NULL);
 119         OBD_ALLOC(inode->i_filterdata, sizeof(struct mds_filter_data));
 120         if (inode->i_filterdata == NULL)
 121                 return -ENOMEM;
 122         LASSERT(igrab(inode) == inode);
 123         return 0;
 124 }
 125
 126 /* Caller must hold mds->mds_epoch_sem */
 127 static void mds_free_filterdata(struct inode *inode)
 128 {
 129         LASSERT(inode->i_filterdata != NULL);
 130         OBD_FREE(inode->i_filterdata, sizeof(struct mds_filter_data));
 131         inode->i_filterdata = NULL;
 132         iput(inode);
 133 }
 134 #endif /*IFILTERDATA_ACTUALLY_USED*/
 135
 136 /* Write access to a file: executors cause a negative count,
 137  * writers a positive count.  The semaphore is needed to perform
 138  * a check for the sign and then increment or decrement atomically.
 139  *
 140  * This code is closely tied to the allocation of the d_fsdata and the
 141  * MDS epoch, so we use the same semaphore for the whole lot.
 142  *
 143  * We could use a different semaphore for each file, if it ever shows
 144  * up in a profile, which it won't.
 145  *
 146  * epoch argument is nonzero during recovery */
 147 static int mds_get_write_access(struct mds_obd *mds, struct inode *inode,
 148                                 __u64 epoch)
 149 {
 150         int rc = 0;
 151
 152         down(&mds->mds_epoch_sem);
 153
 154         if (atomic_read(&inode->i_writecount) < 0) {
 155                 up(&mds->mds_epoch_sem);
 156                 RETURN(-ETXTBSY);
 157         }
 158
 159 #ifdef IFILTERDATA_ACTUALLY_USED
 160         if (MDS_FILTERDATA(inode) && MDS_FILTERDATA(inode)->io_epoch != 0) {
 161                 CDEBUG(D_INODE, "continuing MDS epoch "LPU64" for ino %lu/%u\n",
 162                        MDS_FILTERDATA(inode)->io_epoch, inode->i_ino,
 163                        inode->i_generation);
 164                 goto out;
 165         }
 166
 167         if (inode->i_filterdata == NULL)
 168                 mds_alloc_filterdata(inode);
 169         if (inode->i_filterdata == NULL) {
 170                 rc = -ENOMEM;
 171                 goto out;
 172         }
 173 #endif /*IFILTERDATA_ACTUALLY_USED*/
 174         if (epoch > mds->mds_io_epoch)
 175                 mds->mds_io_epoch = epoch;
 176         else
 177                 mds->mds_io_epoch++;
 178 #ifdef IFILTERDATA_ACTUALLY_USED
 179         MDS_FILTERDATA(inode)->io_epoch = mds->mds_io_epoch;
 180         CDEBUG(D_INODE, "starting MDS epoch "LPU64" for ino %lu/%u\n",
 181                mds->mds_io_epoch, inode->i_ino, inode->i_generation);
 182  out:
 183 #endif /*IFILTERDATA_ACTUALLY_USED*/
 184         if (rc == 0)
 185                 atomic_inc(&inode->i_writecount);
 186         up(&mds->mds_epoch_sem);
 187         return rc;
 188 }
 189
 190 /* Returns EAGAIN if the client needs to get size and/or cookies and close
 191  * again -- which is never true if the file is about to be unlinked.  Otherwise
 192  * returns the number of remaining writers. */
 193 static int mds_put_write_access(struct mds_obd *mds, struct inode *inode,
 194                                 struct mds_body *body, int unlinking)
 195 {
 196         int rc = 0;
 197         ENTRY;
 198
 199         down(&mds->mds_epoch_sem);
 200         atomic_dec(&inode->i_writecount);
 201         rc = atomic_read(&inode->i_writecount);
 202         if (rc > 0)
 203                 GOTO(out, rc);
 204 #if 0
 205         if (!unlinking && !(body->valid & OBD_MD_FLSIZE))
 206                 GOTO(out, rc = EAGAIN);
 207 #endif
 208 #ifdef IFILTERDATA_ACTUALLY_USED
 209         mds_free_filterdata(inode);
 210 #endif
 211  out:
 212         up(&mds->mds_epoch_sem);
 213         return rc;
 214 }
 215
 216 static int mds_deny_write_access(struct mds_obd *mds, struct inode *inode)
 217 {
 218         ENTRY;
 219         down(&mds->mds_epoch_sem);
 220         if (atomic_read(&inode->i_writecount) > 0) {
 221                 up(&mds->mds_epoch_sem);
 222                 RETURN(-ETXTBSY);
 223         }
 224         atomic_dec(&inode->i_writecount);
 225         up(&mds->mds_epoch_sem);
 226         RETURN(0);
 227 }
 228
 229 static void mds_allow_write_access(struct inode *inode)
 230 {
 231         ENTRY;
 232         atomic_inc(&inode->i_writecount);
 233 }
 234
 235 int mds_query_write_access(struct inode *inode)
 236 {
 237         ENTRY;
 238         RETURN(atomic_read(&inode->i_writecount));
 239 }
 240
 241 /* This replaces the VFS dentry_open, it manages mfd and writecount */
 242 static struct mds_file_data *mds_dentry_open(struct dentry *dentry,
 243                                              struct vfsmount *mnt, int flags,
 244                                              struct ptlrpc_request *req)
 245 {
 246         struct mds_export_data *med = &req->rq_export->exp_mds_data;
 247         struct mds_obd *mds = mds_req2mds(req);
 248         struct mds_file_data *mfd;
 249         struct mds_body *body;
 250         int error;
 251         ENTRY;
 252
 253         mfd = mds_mfd_new();
 254         if (mfd == NULL) {
 255                 CERROR("mds: out of memory\n");
 256                 GOTO(cleanup_dentry, error = -ENOMEM);
 257         }
 258
 259         body = lustre_msg_buf(req->rq_repmsg, 1, sizeof (*body));
 260
 261         if (flags & FMODE_WRITE) {
 262                 /* FIXME: in recovery, need to pass old epoch here */
 263                 error = mds_get_write_access(mds, dentry->d_inode, 0);
 264                 if (error)
 265                         GOTO(cleanup_mfd, error);
 266 #ifdef IFILTERDATA_ACTUALLY_USED
 267                 body->io_epoch = MDS_FILTERDATA(dentry->d_inode)->io_epoch;
 268 #endif /*IFILTERDATA_ACTUALLY_USED*/
 269         } else if (flags & FMODE_EXEC) {
 270                 error = mds_deny_write_access(mds, dentry->d_inode);
 271                 if (error)
 272                         GOTO(cleanup_mfd, error);
 273         }
 274
 275         dget(dentry);
 276
 277         /* Mark the file as open to handle open-unlink. */
 278
 279         DOWN_WRITE_I_ALLOC_SEM(dentry->d_inode);
 280         mds_orphan_open_inc(dentry->d_inode);
 281         UP_WRITE_I_ALLOC_SEM(dentry->d_inode);
 282
 283         mfd->mfd_mode = flags;
 284         mfd->mfd_dentry = dentry;
 285         mfd->mfd_xid = req->rq_xid;
 286
 287         spin_lock(&med->med_open_lock);
 288         list_add(&mfd->mfd_list, &med->med_open_head);
 289         spin_unlock(&med->med_open_lock);
 290         mds_mfd_put(mfd);
 291
 292         body->handle.cookie = mfd->mfd_handle.h_cookie;
 293
 294         RETURN(mfd);
 295
 296 cleanup_mfd:
 297         mds_mfd_put(mfd);
 298         mds_mfd_destroy(mfd);
 299 cleanup_dentry:
 300         return ERR_PTR(error);
 301 }
 302
 303 static void mds_objids_from_lmm(obd_id *ids, struct lov_mds_md *lmm,
 304                                 struct lov_desc *desc)
 305 {
 306         int i;
 307         for (i = 0; i < le32_to_cpu(lmm->lmm_stripe_count); i++) {
 308                 ids[le32_to_cpu(lmm->lmm_objects[i].l_ost_idx)] =
 309                         le64_to_cpu(lmm->lmm_objects[i].l_object_id);
 310         }
 311 }
 312
 313 /* Must be called with i_sem held */
 314 static int mds_create_objects(struct ptlrpc_request *req, int offset,
 315                               struct mds_update_record *rec,
 316                               struct mds_obd *mds, struct obd_device *obd,
 317                               struct dentry *dchild, void **handle,
 318                               obd_id **ids)
 319 {
 320         struct obdo *oa = NULL;
 321         struct obd_trans_info oti = { 0 };
 322         struct mds_body *body;
 323         struct lov_stripe_md *lsm = NULL;
 324         struct lov_mds_md *lmm = NULL;
 325         struct inode *inode = dchild->d_inode;
 326         void *lmm_buf;
 327         int rc, lmm_bufsize, lmm_size;
 328         ENTRY;
 329
 330         if (rec->ur_flags & MDS_OPEN_DELAY_CREATE ||
 331             !(rec->ur_flags & FMODE_WRITE))
 332                 RETURN(0);
 333
 334         body = lustre_msg_buf(req->rq_repmsg, 1, sizeof(*body));
 335
 336         if (!S_ISREG(inode->i_mode))
 337                 RETURN(0);
 338         if (body->valid & OBD_MD_FLEASIZE)
 339                 RETURN(0);
 340
 341         OBD_ALLOC(*ids, mds->mds_dt_desc.ld_tgt_count * sizeof(**ids));
 342         if (*ids == NULL)
 343                 RETURN(-ENOMEM);
 344         oti.oti_objid = *ids;
 345
 346         /* replay case */
 347         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
 348                 LASSERT(id_ino(rec->ur_id2));
 349                 body->valid |= OBD_MD_FLBLKSZ | OBD_MD_FLEASIZE;
 350                 lmm_size = rec->ur_eadatalen;
 351                 lmm = rec->ur_eadata;
 352                 LASSERT(lmm);
 353
 354                 if (*handle == NULL)
 355                         *handle = fsfilt_start(obd,inode,FSFILT_OP_CREATE,NULL);
 356                 if (IS_ERR(*handle)) {
 357                         rc = PTR_ERR(*handle);
 358                         *handle = NULL;
 359                         GOTO(out_oa, rc);
 360                 }
 361
 362                 mds_objids_from_lmm(*ids, lmm, &mds->mds_dt_desc);
 363
 364                 lmm_buf = lustre_msg_buf(req->rq_repmsg, offset, 0);
 365                 lmm_bufsize = req->rq_repmsg->buflens[offset];
 366                 LASSERT(lmm_buf);
 367                 LASSERT(lmm_bufsize >= lmm_size);
 368                 memcpy(lmm_buf, lmm, lmm_size);
 369                 rc = fsfilt_set_md(obd, inode, *handle, lmm,
 370                                    lmm_size, EA_LOV);
 371                 if (rc)
 372                         CERROR("open replay failed to set md:%d\n", rc);
 373                 RETURN(0);
 374         }
 375
 376         if (OBD_FAIL_CHECK_ONCE(OBD_FAIL_MDS_ALLOC_OBDO))
 377                 GOTO(out_ids, rc = -ENOMEM);
 378
 379         oa = obdo_alloc();
 380         if (oa == NULL)
 381                 GOTO(out_ids, rc = -ENOMEM);
 382         oa->o_mode = S_IFREG | 0600;
 383         oa->o_id = inode->i_ino;
 384         oa->o_gr = FILTER_GROUP_FIRST_MDS + mds->mds_num;
 385         oa->o_generation = inode->i_generation;
 386         oa->o_uid = 0; /* must have 0 uid / gid on OST */
 387         oa->o_gid = 0;
 388         oa->o_valid = OBD_MD_FLID | OBD_MD_FLGENER | OBD_MD_FLTYPE |
 389                 OBD_MD_FLMODE | OBD_MD_FLUID | OBD_MD_FLGID | OBD_MD_FLGROUP;
 390         oa->o_size = 0;
 391
 392         obdo_from_inode(oa, inode, OBD_MD_FLTYPE|OBD_MD_FLATIME|OBD_MD_FLMTIME|
 393                         OBD_MD_FLCTIME);
 394
 395         if (!(rec->ur_flags & MDS_OPEN_HAS_OBJS)) {
 396                 /* check if things like lfs setstripe are sending us the ea */
 397                 if (rec->ur_flags & MDS_OPEN_HAS_EA) {
 398                         rc = obd_iocontrol(OBD_IOC_LOV_SETSTRIPE,
 399                                            mds->mds_dt_exp,
 400                                            0, &lsm, rec->ur_eadata);
 401                         if (rc)
 402                                 GOTO(out_oa, rc);
 403                 } else {
 404                         OBD_ALLOC(lmm, mds->mds_max_mdsize);
 405                         if (lmm == NULL)
 406                                 GOTO(out_oa, rc = -ENOMEM);
 407
 408                         lmm_size = mds->mds_max_mdsize;
 409                         rc = mds_get_md(obd, dchild->d_parent->d_inode,
 410                                         lmm, &lmm_size, 1, 0);
 411                         if (rc > 0)
 412                                 rc = obd_iocontrol(OBD_IOC_LOV_SETSTRIPE,
 413                                                    mds->mds_dt_exp,
 414                                                    0, &lsm, lmm);
 415                         OBD_FREE(lmm, mds->mds_max_mdsize);
 416                         if (rc)
 417                                 GOTO(out_oa, rc);
 418                 }
 419                 LASSERT(oa->o_gr >= FILTER_GROUP_FIRST_MDS);
 420                 rc = obd_create(mds->mds_dt_exp, oa, &lsm, &oti);
 421                 if (rc) {
 422                         int level = D_ERROR;
 423                         if (rc == -ENOSPC)
 424                                 level = D_INODE;
 425                         CDEBUG(level, "error creating objects for "
 426                                       "inode %lu: rc = %d\n",
 427                                inode->i_ino, rc);
 428                         if (rc > 0) {
 429                                 CERROR("obd_create returned invalid "
 430                                        "rc %d\n", rc);
 431                                 rc = -EIO;
 432                         }
 433                         GOTO(out_oa, rc);
 434                 }
 435         } else {
 436                 rc = obd_iocontrol(OBD_IOC_LOV_SETEA, mds->mds_dt_exp,
 437                                    0, &lsm, rec->ur_eadata);
 438                 if (rc) {
 439                         GOTO(out_oa, rc);
 440                 }
 441                 lsm->lsm_object_id = oa->o_id;
 442                 lsm->lsm_object_gr = oa->o_gr;
 443         }
 444         if (inode->i_size) {
 445                 oa->o_size = inode->i_size;
 446                 obdo_from_inode(oa, inode, OBD_MD_FLTYPE|OBD_MD_FLATIME|
 447                                 OBD_MD_FLMTIME| OBD_MD_FLCTIME| OBD_MD_FLSIZE);
 448                 rc = obd_setattr(mds->mds_dt_exp, oa, lsm, &oti);
 449                 if (rc) {
 450                         CERROR("error setting attrs for inode %lu: rc %d\n",
 451                                inode->i_ino, rc);
 452                         if (rc > 0) {
 453                                 CERROR("obd_setattr returned bad rc %d\n", rc);
 454                                 rc = -EIO;
 455                         }
 456                         GOTO(out_oa, rc);
 457                 }
 458         }
 459
 460         body->valid |= OBD_MD_FLBLKSZ | OBD_MD_FLEASIZE;
 461         obdo_refresh_inode(inode, oa, OBD_MD_FLBLKSZ);
 462
 463         LASSERT(lsm && lsm->lsm_object_id);
 464         lmm = NULL;
 465         rc = obd_packmd(mds->mds_dt_exp, &lmm, lsm);
 466         if (!id_ino(rec->ur_id2))
 467                 obd_free_memmd(mds->mds_dt_exp, &lsm);
 468         LASSERT(rc >= 0);
 469         lmm_size = rc;
 470         body->eadatasize = rc;
 471
 472         if (*handle == NULL)
 473                 *handle = fsfilt_start(obd, inode, FSFILT_OP_CREATE, NULL);
 474         if (IS_ERR(*handle)) {
 475                 rc = PTR_ERR(*handle);
 476                 *handle = NULL;
 477                 GOTO(out_ids, rc);
 478         }
 479
 480         rc = fsfilt_set_md(obd, inode, *handle, lmm,
 481                            lmm_size, EA_LOV);
 482
 483         lmm_buf = lustre_msg_buf(req->rq_repmsg, offset, 0);
 484         lmm_bufsize = req->rq_repmsg->buflens[offset];
 485         LASSERT(lmm_buf);
 486         LASSERT(lmm_bufsize >= lmm_size);
 487
 488         memcpy(lmm_buf, lmm, lmm_size);
 489         obd_free_diskmd(mds->mds_dt_exp, &lmm);
 490  out_oa:
 491         oti_free_cookies(&oti);
 492         obdo_free(oa);
 493  out_ids:
 494         if (rc) {
 495                 OBD_FREE(*ids, mds->mds_dt_desc.ld_tgt_count * sizeof(**ids));
 496                 *ids = NULL;
 497         }
 498         if(lsm)
 499                 obd_free_memmd(mds->mds_dt_exp, &lsm);
 500         RETURN(rc);
 501 }
 502
 503 static void reconstruct_open(struct mds_update_record *rec, int offset,
 504                              struct ptlrpc_request *req,
 505                              struct lustre_handle *child_lockh)
 506 {
 507         struct mds_export_data *med = &req->rq_export->exp_mds_data;
 508         struct mds_client_data *mcd = med->med_mcd;
 509         struct mds_obd *mds = mds_req2mds(req);
 510         struct mds_file_data *mfd;
 511         struct obd_device *obd = req->rq_export->exp_obd;
 512         struct dentry *parent, *dchild;
 513         struct ldlm_reply *rep;
 514         struct mds_body *body;
 515         struct list_head *t;
 516         int put_child = 1;
 517         int rc;
 518         ENTRY;
 519
 520         LASSERT(offset == 3); /* only called via intent */
 521         rep = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*rep));
 522         body = lustre_msg_buf(req->rq_repmsg, 1, sizeof (*body));
 523
 524         /* copy rc, transno and disp; steal locks */
 525         mds_req_from_mcd(req, mcd);
 526         intent_set_disposition(rep, mcd->mcd_last_data);
 527
 528         /* Only replay if create or open actually happened. */
 529         if (!intent_disposition(rep, DISP_OPEN_CREATE | DISP_OPEN_OPEN) ) {
 530                 EXIT;
 531                 return; /* error looking up parent or child */
 532         }
 533
 534         parent = mds_id2dentry(obd, rec->ur_id1, NULL);
 535         LASSERTF(!IS_ERR(parent), "lid "DLID4" rc %ld\n",
 536                  OLID4(rec->ur_id1), PTR_ERR(parent));
 537
 538         dchild = ll_lookup_one_len(rec->ur_name, parent,
 539                                    rec->ur_namelen - 1);
 540         LASSERTF(!IS_ERR(dchild), "parent "DLID4" child %s rc %ld\n",
 541                  OLID4(rec->ur_id1), rec->ur_name, PTR_ERR(dchild));
 542
 543         if (!dchild->d_inode)
 544                 GOTO(out_dput, 0); /* child not present to open */
 545
 546         /* At this point, we know we have a child. We'll send
 547          * it back _unless_ it not created and open failed.  */
 548         if (intent_disposition(rep, DISP_OPEN_OPEN) &&
 549             !intent_disposition(rep, DISP_OPEN_CREATE) &&
 550             req->rq_status)
 551                 GOTO(out_dput, 0);
 552
 553         /* get lock (write for O_CREAT, read otherwise) */
 554         mds_pack_inode2body(obd, body, dchild->d_inode, 1);
 555         if (S_ISREG(dchild->d_inode->i_mode)) {
 556                 rc = mds_pack_md(obd, req->rq_repmsg, 2, body,
 557                                  dchild->d_inode, 1, 0);
 558
 559                 if (rc)
 560                         LASSERT(rc == req->rq_status);
 561
 562                 /* If we have LOV EA data, the OST holds size, mtime */
 563                 if (!(body->valid & OBD_MD_FLEASIZE))
 564                         body->valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
 565                                         OBD_MD_FLATIME | OBD_MD_FLMTIME);
 566         }
 567
 568         /* If we have -EEXIST as the status, and we were asked to create
 569          * exclusively, we can tell we failed because the file already existed.
 570          */
 571         if (req->rq_status == -EEXIST &&
 572             ((rec->ur_flags & (MDS_OPEN_CREAT | MDS_OPEN_EXCL)) ==
 573              (MDS_OPEN_CREAT | MDS_OPEN_EXCL))) {
 574                 GOTO(out_dput, 0);
 575         }
 576
 577         /* If we didn't get as far as trying to open, then some locking thing
 578          * probably went wrong, and we'll just bail here.
 579          */
 580         if (!intent_disposition(rep, DISP_OPEN_OPEN))
 581                 GOTO(out_dput, 0);
 582
 583         /* If we failed, then we must have failed opening, so don't look for
 584          * file descriptor or anything, just give the client the bad news.
 585          */
 586         if (req->rq_status)
 587                 GOTO(out_dput, 0);
 588
 589         mfd = NULL;
 590         list_for_each(t, &med->med_open_head) {
 591                 mfd = list_entry(t, struct mds_file_data, mfd_list);
 592                 if (mfd->mfd_xid == req->rq_xid)
 593                         break;
 594                 mfd = NULL;
 595         }
 596
 597         /* #warning "XXX fixme" bug 2991 */
 598         /* Here it used to LASSERT(mfd) if exp_outstanding_reply != NULL.
 599          * Now that exp_outstanding_reply is a list, it's just using mfd != NULL
 600          * to detect a re-open */
 601         if (mfd == NULL) {
 602                 mntget(mds->mds_vfsmnt);
 603                 CERROR("Re-opened file \n");
 604                 mfd = mds_dentry_open(dchild, mds->mds_vfsmnt,
 605                                       rec->ur_flags & ~MDS_OPEN_TRUNC, req);
 606                 if (!mfd) {
 607                         CERROR("mds: out of memory\n");
 608                         GOTO(out_dput, req->rq_status = -ENOMEM);
 609                 }
 610                 put_child = 0;
 611         } else {
 612                 body->handle.cookie = mfd->mfd_handle.h_cookie;
 613                 CDEBUG(D_INODE, "resend mfd %p, cookie "LPX64"\n", mfd,
 614                        mfd->mfd_handle.h_cookie);
 615         }
 616
 617  out_dput:
 618         if (put_child)
 619                 l_dput(dchild);
 620         l_dput(parent);
 621         EXIT;
 622 }
 623
 624 /* do NOT or the MAY_*'s, you'll get the weakest */
 625 static int accmode(int flags)
 626 {
 627         int res = 0;
 628
 629         if (flags & FMODE_READ)
 630                 res = MAY_READ;
 631         if (flags & (FMODE_WRITE|MDS_OPEN_TRUNC))
 632                 res |= MAY_WRITE;
 633         if (flags & FMODE_EXEC)
 634                 res = MAY_EXEC;
 635         return res;
 636 }
 637
 638 /* Handles object creation, actual opening, and I/O epoch */
 639 static int mds_finish_open(struct ptlrpc_request *req, struct dentry *dchild,
 640                            struct mds_body *body, int flags, void **handle,
 641                            struct mds_update_record *rec, struct ldlm_reply *rep)
 642 {
 643         struct mds_obd *mds = mds_req2mds(req);
 644         struct obd_device *obd = req->rq_export->exp_obd;
 645         struct mds_file_data *mfd = NULL;
 646         obd_id *ids = NULL; /* object IDs created */
 647         unsigned mode;
 648         int rc = 0;
 649         ENTRY;
 650
 651         /* atomically create objects if necessary */
 652         down(&dchild->d_inode->i_sem);
 653         mode = dchild->d_inode->i_mode;
 654         if ((S_ISREG(mode) && !(body->valid & OBD_MD_FLEASIZE)) ||
 655             (S_ISDIR(mode) && !(body->valid & OBD_MD_FLDIREA))) {
 656                 rc = mds_pack_md(obd, req->rq_repmsg, 2, body,
 657                                  dchild->d_inode, 0, 0);
 658                 if (rc) {
 659                         up(&dchild->d_inode->i_sem);
 660                         RETURN(rc);
 661                 }
 662         }
 663         if (rec != NULL) {
 664                 /* no EA: create objects */
 665                 if ((body->valid & OBD_MD_FLEASIZE) &&
 666                     (rec->ur_flags & MDS_OPEN_HAS_EA)) {
 667                         up(&dchild->d_inode->i_sem);
 668                         RETURN(-EEXIST);
 669                 }
 670                 if (!(body->valid & OBD_MD_FLEASIZE)) {
 671                         /* no EA: create objects */
 672                         rc = mds_create_objects(req, 2, rec, mds, obd,
 673                                                 dchild, handle, &ids);
 674                         if (rc) {
 675                                 CERROR("mds_create_objects: rc = %d\n", rc);
 676                                 up(&dchild->d_inode->i_sem);
 677                                 RETURN(rc);
 678                         }
 679                 }
 680                 if (S_ISREG(dchild->d_inode->i_mode) &&
 681                     (body->valid & OBD_MD_FLEASIZE)) {
 682                         rc = mds_revalidate_lov_ea(obd, dchild->d_inode,
 683                                                    req->rq_repmsg, 2);
 684                         if (!rc)
 685                                 rc = mds_pack_md(obd, req->rq_repmsg, 2, body,
 686                                                  dchild->d_inode, 0, 0);
 687                         if (rc) {
 688                                 up(&dchild->d_inode->i_sem);
 689                                 RETURN(rc);
 690                         }
 691                 }
 692         }
 693         rc = mds_pack_acl(obd, req->rq_repmsg, 3, body, dchild->d_inode);
 694         if (rc < 0) {
 695                 CERROR("mds_pack_acl: rc = %d\n", rc);
 696                 up(&dchild->d_inode->i_sem);
 697                 RETURN(rc);
 698         }
 699
 700         /* If the inode has no EA data, then MDSs hold size, mtime */
 701         if (S_ISREG(dchild->d_inode->i_mode) &&
 702             !(body->valid & OBD_MD_FLEASIZE)) {
 703                 body->valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
 704                                 OBD_MD_FLATIME | OBD_MD_FLMTIME);
 705         }
 706         up(&dchild->d_inode->i_sem);
 707
 708         intent_set_disposition(rep, DISP_OPEN_OPEN);
 709         mfd = mds_dentry_open(dchild, mds->mds_vfsmnt, flags, req);
 710         if (IS_ERR(mfd))
 711                 RETURN(PTR_ERR(mfd));
 712
 713         CDEBUG(D_INODE, "mfd %p, cookie "LPX64"\n", mfd,
 714                mfd->mfd_handle.h_cookie);
 715         if (ids != NULL) {
 716                 mds_dt_update_objids(obd, ids);
 717                 OBD_FREE(ids, sizeof(*ids) * mds->mds_dt_desc.ld_tgt_count);
 718         }
 719         //if (rc)
 720         //        mds_mfd_destroy(mfd);
 721         RETURN(rc);
 722 }
 723
 724 static int mds_open_by_id(struct ptlrpc_request *req,
 725                           struct lustre_id *id,
 726                           struct mds_body *body, int flags,
 727                           struct mds_update_record *rec,
 728                           struct ldlm_reply *rep)
 729 {
 730         struct mds_obd *mds = mds_req2mds(req);
 731         struct inode *pending_dir = mds->mds_pending_dir->d_inode;
 732         struct dentry *dchild;
 733         char idname[LL_ID_NAMELEN];
 734         int idlen = 0, rc;
 735         void *handle = NULL;
 736         ENTRY;
 737
 738         down(&pending_dir->i_sem);
 739         idlen = ll_id2str(idname, id_ino(id), id_gen(id));
 740         dchild = lookup_one_len(idname, mds->mds_pending_dir,
 741                                 idlen);
 742         if (IS_ERR(dchild)) {
 743                 up(&pending_dir->i_sem);
 744                 rc = PTR_ERR(dchild);
 745                 CERROR("error looking up %s in PENDING: rc = %d\n",
 746                        idname, rc);
 747                 RETURN(rc);
 748         }
 749
 750         up(&pending_dir->i_sem);
 751         if (dchild->d_inode != NULL) {
 752                 mds_inode_set_orphan(dchild->d_inode);
 753                 mds_pack_inode2body(req2obd(req), body,
 754                                     dchild->d_inode, 1);
 755
 756                 intent_set_disposition(rep, DISP_LOOKUP_EXECD);
 757                 intent_set_disposition(rep, DISP_LOOKUP_POS);
 758                 CWARN("Orphan %s found and opened in PENDING directory\n",
 759                        idname);
 760                 goto open;
 761         }
 762         l_dput(dchild);
 763
 764         /*
 765          * we didn't find it in PENDING so it isn't an orphan.  See if it was a
 766          * regular inode that was previously created.
 767          */
 768         dchild = mds_id2dentry(req2obd(req), id, NULL);
 769         if (IS_ERR(dchild))
 770                 RETURN(PTR_ERR(dchild));
 771
 772         mds_pack_inode2body(req2obd(req), body,
 773                             dchild->d_inode, 1);
 774
 775         intent_set_disposition(rep, DISP_LOOKUP_EXECD);
 776         intent_set_disposition(rep, DISP_LOOKUP_POS);
 777
 778  open:
 779         rc = mds_finish_open(req, dchild, body, flags, &handle, rec, rep);
 780         rc = mds_finish_transno(mds, dchild ? dchild->d_inode : NULL, handle,
 781                                 req, rc, rep ? rep->lock_policy_res1 : 0);
 782         /* XXX what do we do here if mds_finish_transno itself failed? */
 783         l_dput(dchild);
 784         RETURN(rc);
 785 }
 786
 787 int mds_pin(struct ptlrpc_request *req, int offset)
 788 {
 789         struct obd_device *obd = req->rq_export->exp_obd;
 790         struct mds_body *request_body, *reply_body;
 791         struct lvfs_run_ctxt saved;
 792         int rc, size = sizeof(*reply_body);
 793         ENTRY;
 794
 795         request_body = lustre_msg_buf(req->rq_reqmsg, offset,
 796                                       sizeof(*request_body));
 797
 798         rc = lustre_pack_reply(req, 1, &size, NULL);
 799         if (rc)
 800                 RETURN(rc);
 801         reply_body = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*reply_body));
 802
 803         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 804         rc = mds_open_by_id(req, &request_body->id1, reply_body,
 805                             request_body->flags, NULL, NULL);
 806         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 807
 808         RETURN(rc);
 809 }
 810
 811 /*
 812  * get a lock on the ino to sync with creation WRT inode reuse (bug 2029). If
 813  * child_lockh is NULL we just get the lock as a barrier to wait for other
 814  * holders of this lock, and drop it right away again.
 815  */
 816 int mds_lock_new_child(struct obd_device *obd, struct inode *inode,
 817                        struct lustre_handle *child_lockh)
 818 {
 819         struct ldlm_res_id child_res_id = { .name = { inode->i_ino, 0, 1, 0 } };
 820         struct lustre_handle lockh;
 821         int lock_flags = 0;
 822         int rc;
 823         ENTRY;
 824
 825         if (child_lockh == NULL)
 826                 child_lockh = &lockh;
 827
 828         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, child_res_id,
 829                               LDLM_PLAIN, NULL, LCK_EX, &lock_flags,
 830                               mds_blocking_ast, ldlm_completion_ast, NULL,
 831                               NULL, NULL, 0, NULL, child_lockh);
 832         if (rc != ELDLM_OK)
 833                 CERROR("ldlm_cli_enqueue: %d\n", rc);
 834         else if (child_lockh == &lockh)
 835                 ldlm_lock_decref(child_lockh, LCK_EX);
 836
 837         RETURN(rc);
 838 }
 839
 840 int mds_open(struct mds_update_record *rec, int offset,
 841              struct ptlrpc_request *req, struct lustre_handle *child_lockh)
 842 {
 843         /* XXX ALLOCATE _something_ - 464 bytes on stack here */
 844         struct obd_device *obd = req->rq_export->exp_obd;
 845         struct mds_export_data *med = &req->rq_export->u.eu_mds_data;
 846         struct mds_obd *mds = mds_req2mds(req);
 847         struct ldlm_reply *rep = NULL;
 848         struct mds_body *body = NULL;
 849         struct dentry *dchild = NULL, *dparent = NULL;
 850         struct lustre_handle parent_lockh[2] = {{0}, {0}};
 851         int rc = 0, cleanup_phase = 0, acc_mode, created = 0;
 852         int parent_mode = LCK_PR;
 853         void *handle = NULL;
 854         struct dentry_params dp;
 855         struct mea *mea = NULL;
 856         int mea_size, update_mode;
 857         int child_mode = LCK_PR;
 858         /* Always returning LOOKUP lock if open succesful to guard
 859            dentry on client. */
 860         ldlm_policy_data_t policy = {.l_inodebits={MDS_INODELOCK_LOOKUP}};
 861         struct ldlm_res_id child_res_id = { .name = {0}};
 862         int lock_flags = 0;
 863         ENTRY;
 864
 865         DEBUG_REQ(D_INODE, req, "parent "DLID4" name %*s mode %o",
 866                   OLID4(rec->ur_id1), rec->ur_namelen - 1, rec->ur_name,
 867                   rec->ur_mode);
 868
 869         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_PAUSE_OPEN | OBD_FAIL_ONCE,
 870                          (obd_timeout + 1) / 4);
 871
 872         if (offset == 3) { /* intent */
 873                 rep = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*rep));
 874                 body = lustre_msg_buf(req->rq_repmsg, 1, sizeof (*body));
 875         } else if (offset == 1) { /* non-intent reint */
 876                 body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body));
 877         } else {
 878                 body = NULL;
 879                 LBUG();
 880         }
 881
 882         MDS_CHECK_RESENT(req, reconstruct_open(rec, offset, req, child_lockh));
 883
 884         /*
 885          * Step 0: If we are passed a id, then we assume the client already
 886          * opened this file and is only replaying the RPC, so we open the inode
 887          * by fid (at some large expense in security).
 888          */
 889         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
 890                 CDEBUG(D_HA, "open obj "DLID4" name %*s mode %o\n",
 891                        OLID4(rec->ur_id2), rec->ur_namelen - 1,
 892                        rec->ur_name, rec->ur_mode);
 893
 894                 LASSERT(id_ino(rec->ur_id2));
 895
 896                 rc = mds_open_by_id(req, rec->ur_id2, body, rec->ur_flags,
 897                                     rec, rep);
 898                 if (rc != -ENOENT) {
 899                         mds_body_do_reverse_map(med, body);
 900                         RETURN(rc);
 901                 }
 902
 903                 /* We didn't find the correct inode on disk either, so we
 904                  * need to re-create it via a regular replay. */
 905                 LASSERT(rec->ur_flags & MDS_OPEN_CREAT);
 906         } else {
 907                 LASSERT(!id_ino(rec->ur_id2));
 908         }
 909
 910         LASSERT(offset == 3); /* If we got here, we must be called via intent */
 911
 912         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_OPEN_PACK)) {
 913                 CERROR("test case OBD_FAIL_MDS_OPEN_PACK\n");
 914                 RETURN(-ENOMEM);
 915         }
 916
 917         acc_mode = accmode(rec->ur_flags);
 918
 919         /* Step 1: Find and lock the parent */
 920         if (rec->ur_flags & MDS_OPEN_CREAT) {
 921                 /* XXX Well, in fact we only need this lock mode change if
 922                    in addition to O_CREAT, the file does not exist.
 923                    But we do not know if it exists or not yet */
 924                 parent_mode = LCK_PW;
 925         }
 926
 927         if (rec->ur_namelen == 1) {
 928                 /* client (LMV) wants to open the file by id */
 929                 CDEBUG(D_OTHER, "OPEN by id "DLID4"\n", OLID4(rec->ur_id1));
 930                 dchild = mds_id2dentry(obd, rec->ur_id1, NULL);
 931                 if (IS_ERR(dchild)) {
 932                         rc = PTR_ERR(dparent);
 933                         CERROR("child lookup by an id error %d\n", rc);
 934                         GOTO(cleanup, rc);
 935                 }
 936                 goto got_child;
 937         }
 938
 939 restart:
 940         dparent = mds_id2locked_dentry(obd, rec->ur_id1, NULL, parent_mode,
 941                                        parent_lockh, &update_mode, rec->ur_name,
 942                                        rec->ur_namelen - 1, MDS_INODELOCK_UPDATE);
 943         if (IS_ERR(dparent)) {
 944                 rc = PTR_ERR(dparent);
 945                 if (rc != -ENOENT) {
 946                         CERROR("parent lookup for "DLID4" failed, error %d\n",
 947                                OLID4(rec->ur_id1), rc);
 948                 } else {
 949                         /* Just cannot find parent - make it look like
 950                            usual negative lookup to avoid extra MDS RPC */
 951                         intent_set_disposition(rep, DISP_LOOKUP_EXECD);
 952                         intent_set_disposition(rep, DISP_LOOKUP_NEG);
 953                 }
 954                 GOTO(cleanup, rc);
 955         }
 956         LASSERT(dparent->d_inode != NULL);
 957
 958         cleanup_phase = 1; /* parent dentry and lock */
 959
 960         /* try to retrieve MEA data for this dir */
 961         rc = mds_md_get_attr(obd, dparent->d_inode, &mea, &mea_size);
 962         if (rc)
 963                 GOTO(cleanup, rc);
 964
 965         if (mea != NULL) {
 966                 /*
 967                  * dir is already splitted, check is requested filename should *
 968                  * live at this MDS or at another one.
 969                  */
 970                 int i;
 971                 i = mea_name2idx(mea, rec->ur_name, rec->ur_namelen - 1);
 972                 if (mea->mea_master != id_group(&mea->mea_ids[i])) {
 973                         CDEBUG(D_OTHER,
 974                                "%s: inapropriate MDS(%d) for %lu/%u:%s."
 975                                " should be %lu(%d)\n", obd->obd_name,
 976                                mea->mea_master, dparent->d_inode->i_ino,
 977                                dparent->d_inode->i_generation, rec->ur_name,
 978                                (unsigned long)id_group(&mea->mea_ids[i]), i);
 979                         GOTO(cleanup, rc = -ERESTART);
 980                 }
 981         }
 982
 983         /* Step 2: Lookup the child */
 984         dchild = ll_lookup_one_len(rec->ur_name, dparent, rec->ur_namelen - 1);
 985         if (IS_ERR(dchild)) {
 986                 rc = PTR_ERR(dchild);
 987                 dchild = NULL; /* don't confuse mds_finish_transno() below */
 988                 GOTO(cleanup, rc);
 989         }
 990
 991 got_child:
 992         cleanup_phase = 2; /* child dentry */
 993
 994         if (dchild->d_flags & DCACHE_CROSS_REF) {
 995                 CDEBUG(D_OTHER, "cross reference: "DLID4"\n", OLID4(rec->ur_id1));
 996
 997                 /* we're gonna acquire LOOKUP lock on the child,
 998                  * but we have already locked parent and our order
 999                  * may conflict with enqueue_order_locks(). so,
1000                  * drop parent lock and acquire both the locks in
1001                  * common order. bug 6190 */
1002                 ldlm_lock_decref(parent_lockh, parent_mode);
1003                 l_dput(dchild);
1004                 l_dput(dparent);
1005                 cleanup_phase = 0;
1006
1007                 rc = mds_get_parent_child_locked(obd, mds, rec->ur_id1,
1008                                                  parent_lockh, &dparent,
1009                                                  LCK_PR, MDS_INODELOCK_UPDATE,
1010                                                  &update_mode, rec->ur_name,
1011                                                  rec->ur_namelen, child_lockh,
1012                                                  &dchild, LCK_PR,
1013                                                  MDS_INODELOCK_LOOKUP);
1014
1015                 if (rc)
1016                         GOTO(cleanup, rc);
1017
1018                 if (dchild->d_inode || !(dchild->d_flags & DCACHE_CROSS_REF)) {
1019                         /* wow! someone unlink and create new one yet */
1020                         CDEBUG(D_OTHER, "nice race, repeat lookup\n");
1021                         ldlm_lock_decref(parent_lockh, parent_mode);
1022                         ldlm_lock_decref(child_lockh, LCK_PR);
1023                         l_dput(dchild);
1024                         l_dput(dparent);
1025                         LASSERT(rec->ur_namelen > 1);
1026                         GOTO(restart, rc);
1027                 }
1028
1029                 mds_pack_dentry2body(obd, body, dchild, 1);
1030                 intent_set_disposition(rep, DISP_LOOKUP_POS);
1031                 intent_set_disposition(rep, DISP_LOOKUP_EXECD);
1032
1033 #ifdef S_PDIROPS
1034                 if (parent_lockh[1].cookie != 0)
1035                         ldlm_lock_decref(parent_lockh + 1, update_mode);
1036 #endif
1037                 ldlm_lock_decref(parent_lockh, parent_mode);
1038                 if (mea)
1039                         OBD_FREE(mea, mea_size);
1040                 l_dput(dchild);
1041                 l_dput(dparent);
1042                 RETURN(rc);
1043         }
1044
1045         intent_set_disposition(rep, DISP_LOOKUP_EXECD);
1046
1047         if (dchild->d_inode)
1048                 intent_set_disposition(rep, DISP_LOOKUP_POS);
1049         else
1050                 intent_set_disposition(rep, DISP_LOOKUP_NEG);
1051
1052         /* Step 3: If the child was negative, and we're supposed to, create it.*/
1053         if (dchild->d_inode == NULL) {
1054                 unsigned long ino;
1055                 struct iattr iattr;
1056                 struct inode *inode;
1057
1058                 ino = (unsigned long)id_ino(rec->ur_id2);
1059
1060                 rc = mds_try_to_split_dir(obd, dparent, &mea, 0,
1061                                           update_mode);
1062
1063                 CDEBUG(D_OTHER, "%s: splitted %lu/%u - %d\n",
1064                        obd->obd_name, dparent->d_inode->i_ino,
1065                        dparent->d_inode->i_generation, rc);
1066
1067                 if (rc > 0) {
1068                         /* dir got splitted */
1069                         GOTO(cleanup, rc = -ERESTART);
1070                 } else if (rc < 0) {
1071                         /* error happened during spitting */
1072                         GOTO(cleanup, rc);
1073                 }
1074
1075                 if (!(rec->ur_flags & MDS_OPEN_CREAT)) {
1076                         /*
1077                          * dentry is negative and we weren't supposed to create
1078                          * object, get out of here.
1079                          */
1080                         GOTO(cleanup, rc = -ENOENT);
1081                 }
1082
1083                 intent_set_disposition(rep, DISP_OPEN_CREATE);
1084                 handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_CREATE,
1085                                       NULL);
1086                 if (IS_ERR(handle)) {
1087                         rc = PTR_ERR(handle);
1088                         handle = NULL;
1089                         GOTO(cleanup, rc);
1090                 }
1091                 dchild->d_fsdata = (void *) &dp;
1092                 dp.p_ptr = req;
1093                 dp.p_inum = ino;
1094
1095                 rc = ll_vfs_create(dparent->d_inode, dchild, rec->ur_mode, NULL);
1096                 if (dchild->d_fsdata == (void *)(unsigned long)ino)
1097                         dchild->d_fsdata = NULL;
1098
1099                 if (rc) {
1100                         CDEBUG(D_INODE, "error during create: %d\n", rc);
1101                         GOTO(cleanup, rc);
1102                 }
1103                 inode = dchild->d_inode;
1104                 if (ino) {
1105                         LASSERT(ino == inode->i_ino);
1106
1107                         /* written as part of setattr */
1108                         inode->i_generation = id_gen(rec->ur_id2);
1109                         CDEBUG(D_HA, "recreated ino %lu with gen %u\n",
1110                                inode->i_ino, inode->i_generation);
1111                 }
1112
1113                 created = 1;
1114                 LTIME_S(iattr.ia_atime) = rec->ur_time;
1115                 LTIME_S(iattr.ia_ctime) = rec->ur_time;
1116                 LTIME_S(iattr.ia_mtime) = rec->ur_time;
1117
1118                 iattr.ia_uid = rec->ur_fsuid;
1119                 if (dparent->d_inode->i_mode & S_ISGID)
1120                         iattr.ia_gid = dparent->d_inode->i_gid;
1121                 else
1122                         iattr.ia_gid = rec->ur_fsgid;
1123
1124                 iattr.ia_valid = ATTR_UID | ATTR_GID | ATTR_ATIME |
1125                         ATTR_MTIME | ATTR_CTIME;
1126
1127                 rc = fsfilt_setattr(obd, dchild, handle, &iattr, 0);
1128                 if (rc)
1129                         CERROR("error on child setattr: rc = %d\n", rc);
1130
1131                 iattr.ia_valid = ATTR_MTIME | ATTR_CTIME;
1132
1133                 rc = fsfilt_setattr(obd, dparent, handle, &iattr, 0);
1134                 if (rc)
1135                         CERROR("error on parent setattr: rc = %d\n", rc);
1136                 else {
1137                         MD_COUNTER_INCREMENT(obd, create);
1138                 }
1139
1140                 down(&dchild->d_inode->i_sem);
1141                 if (ino) {
1142                         rc = mds_update_inode_sid(obd, dchild->d_inode,
1143                                                   handle, rec->ur_id2);
1144                         if (rc) {
1145                                 CERROR("mds_update_inode_sid() failed, "
1146                                        "rc = %d\n", rc);
1147                         }
1148                         id_assign_fid(&body->id1, rec->ur_id2);
1149
1150                         /*
1151                          * make sure, that fid is up-to-date.
1152                          */
1153                         mds_set_last_fid(obd, id_fid(rec->ur_id2));
1154                 } else {
1155                         rc = mds_alloc_inode_sid(obd, dchild->d_inode,
1156                                                  handle, &body->id1);
1157                         if (rc) {
1158                                 CERROR("mds_alloc_inode_sid() failed, "
1159                                        "rc = %d\n", rc);
1160                         }
1161                 }
1162                 up(&dchild->d_inode->i_sem);
1163
1164                 if (!(rec->ur_flags & O_EXCL)) { /* bug 3313 */
1165                         rc = fsfilt_commit(obd, dchild->d_inode->i_sb,
1166                                            dchild->d_inode, handle,
1167                                            req->rq_export->exp_sync);
1168                         handle = NULL;
1169                 }
1170
1171                 acc_mode = 0;           /* Don't check for permissions */
1172         }
1173         mds_pack_inode2body(obd, body, dchild->d_inode, 1);
1174
1175         LASSERTF(!mds_inode_is_orphan(dchild->d_inode),
1176                  "dchild %.*s (%p) inode %p\n", dchild->d_name.len,
1177                  dchild->d_name.name, dchild, dchild->d_inode);
1178
1179         if (S_ISREG(dchild->d_inode->i_mode)) {
1180                 /* Check permissions etc */
1181                 rc = ll_permission(dchild->d_inode, acc_mode, NULL);
1182                 if (rc != 0)
1183                         GOTO(cleanup, rc);
1184
1185                 /* Can't write to a read-only file */
1186                 if (IS_RDONLY(dchild->d_inode) && (acc_mode & MAY_WRITE) != 0)
1187                         GOTO(cleanup, rc = -EPERM);
1188
1189                 /* An append-only file must be opened in append mode for
1190                  * writing */
1191                 if (IS_APPEND(dchild->d_inode) && (acc_mode & MAY_WRITE) != 0 &&
1192                     ((rec->ur_flags & MDS_OPEN_APPEND) == 0 ||
1193                      (rec->ur_flags & MDS_OPEN_TRUNC) != 0))
1194                         GOTO(cleanup, rc = -EPERM);
1195         }
1196
1197         if (!created && (rec->ur_flags & MDS_OPEN_CREAT) &&
1198             (rec->ur_flags & MDS_OPEN_EXCL)) {
1199                 /* File already exists, we didn't just create it, and we
1200                  * were passed O_EXCL; err-or. */
1201                 GOTO(cleanup, rc = -EEXIST); // returns a lock to the client
1202         }
1203
1204         if (S_ISDIR(dchild->d_inode->i_mode)) {
1205                 if (rec->ur_flags & MDS_OPEN_CREAT ||
1206                     rec->ur_flags & FMODE_WRITE) {
1207                         /* we are trying to create or write a exist dir */
1208                         GOTO(cleanup, rc = -EISDIR);
1209                 }
1210                 if (ll_permission(dchild->d_inode, acc_mode, NULL))
1211                         GOTO(cleanup, rc = -EACCES);
1212
1213                 /*
1214                  * here was checking for possible GNS mount points to skip their
1215                  * open. I removed it as its detection based only on SUID bit is
1216                  * not reliable. Opening such a dirs should not cause any
1217                  * problems, at least tests show that. --umka
1218                  */
1219         }
1220
1221         /* if we are following a symlink, don't open */
1222         if (S_ISLNK(dchild->d_inode->i_mode))
1223                 GOTO(cleanup_no_trans, rc = 0);
1224
1225         if ((rec->ur_flags & MDS_OPEN_DIRECTORY) &&
1226             !S_ISDIR(dchild->d_inode->i_mode))
1227                 GOTO(cleanup, rc = -ENOTDIR);
1228
1229         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_OPEN_CREATE)) {
1230                 obd_fail_loc = OBD_FAIL_LDLM_REPLY | OBD_FAIL_ONCE;
1231                 GOTO(cleanup, rc = -EAGAIN);
1232         }
1233
1234         /* Obtain OPEN lock as well */
1235         policy.l_inodebits.bits |= MDS_INODELOCK_OPEN;
1236
1237         /* We cannot use acc_mode here, because it is zeroed in case of
1238            creating a file, so we get wrong lockmode */
1239         if (accmode(rec->ur_flags) & MAY_WRITE)
1240                 child_mode = LCK_CW;
1241         else if (accmode(rec->ur_flags) & MAY_EXEC)
1242                 child_mode = LCK_PR;
1243         else
1244                 child_mode = LCK_CR;
1245
1246         if (!(lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY)) {
1247                 struct lustre_id sid;
1248
1249                 down(&dchild->d_inode->i_sem);
1250                 rc = mds_read_inode_sid(obd, dchild->d_inode, &sid);
1251                 up(&dchild->d_inode->i_sem);
1252                 if (rc) {
1253                         CERROR("Can't read inode self id, "
1254                                "inode %lu, rc %d\n",
1255                                dchild->d_inode->i_ino, rc);
1256                         GOTO(cleanup, rc);
1257                 }
1258
1259                 /* In case of replay we do not get a lock assuming that the
1260                    caller has it already */
1261                 child_res_id.name[0] = id_fid(&sid);
1262                 child_res_id.name[1] = id_group(&sid);
1263
1264                 rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
1265                                       child_res_id, LDLM_IBITS, &policy,
1266                                       child_mode, &lock_flags,
1267                                       mds_blocking_ast, ldlm_completion_ast,
1268                                       NULL, NULL, NULL, 0, NULL, child_lockh);
1269                 if (rc != ELDLM_OK)
1270                         GOTO(cleanup, rc);
1271
1272                 cleanup_phase = 3;
1273         }
1274
1275         /* Step 5: mds_open it */
1276         rc = mds_finish_open(req, dchild, body, rec->ur_flags, &handle,
1277                              rec, rep);
1278
1279         EXIT;
1280 cleanup:
1281         rc = mds_finish_transno(mds, dchild ? dchild->d_inode : NULL, handle,
1282                                 req, rc, rep ? rep->lock_policy_res1 : 0);
1283
1284 cleanup_no_trans:
1285         switch (cleanup_phase) {
1286         case 3:
1287                 if (rc) {
1288                         ldlm_lock_decref(child_lockh, child_mode);
1289                         child_lockh->cookie = 0;
1290                 }
1291         case 2:
1292                 if (rc && created) {
1293                         int err = vfs_unlink(dparent->d_inode, dchild);
1294                         if (err) {
1295                                 CERROR("unlink(%.*s) in error path: %d\n",
1296                                        dchild->d_name.len, dchild->d_name.name,
1297                                        err);
1298                         }
1299                 } else if (created) {
1300                         mds_lock_new_child(obd, dchild->d_inode, NULL);
1301                 }
1302                 l_dput(dchild);
1303         case 1:
1304                 if (dparent == NULL)
1305                         break;
1306
1307                 l_dput(dparent);
1308 #ifdef S_PDIROPS
1309                 if (parent_lockh[1].cookie != 0)
1310                         ldlm_lock_decref(parent_lockh + 1, update_mode);
1311 #endif
1312                 if (rc)
1313                         ldlm_lock_decref(parent_lockh, parent_mode);
1314                 else
1315                         ptlrpc_save_lock (req, parent_lockh, parent_mode);
1316         }
1317         if (mea)
1318                 OBD_FREE(mea, mea_size);
1319         if (rc == 0)
1320                 atomic_inc(&mds->mds_open_count);
1321
1322         mds_body_do_reverse_map(med, body);
1323
1324         /*
1325          * If we have not taken the "open" lock, we may not return 0 here,
1326          * because caller expects 0 to mean "lock is taken", and it needs
1327          * nonzero return here for caller to return EDLM_LOCK_ABORTED to
1328          * client. Later caller should rewrite the return value back to zero
1329          * if it to be used any further.
1330          */
1331         if ((cleanup_phase != 3) && !rc)
1332                 rc = ENOLCK;
1333
1334         RETURN(rc);
1335 }
1336
1337 /* Close a "file descriptor" and possibly unlink an orphan from the
1338  * PENDING directory.  Caller must hold child->i_sem, this drops it.
1339  *
1340  * If we are being called from mds_disconnect() because the client has
1341  * disappeared, then req == NULL and we do not update last_rcvd because
1342  * there is nothing that could be recovered by the client at this stage
1343  * (it will not even _have_ an entry in last_rcvd anymore).
1344  *
1345  * Returns EAGAIN if the client needs to get more data and re-close. */
1346 int mds_mfd_close(struct ptlrpc_request *req, int offset,
1347                   struct obd_device *obd, struct mds_file_data *mfd,
1348                   int unlink_orphan)
1349 {
1350         struct inode *inode = mfd->mfd_dentry->d_inode;
1351         char idname[LL_ID_NAMELEN];
1352         int last_orphan, idlen, rc = 0, cleanup_phase = 0;
1353         struct dentry *pending_child = NULL;
1354         struct mds_obd *mds = &obd->u.mds;
1355         struct inode *pending_dir = mds->mds_pending_dir->d_inode;
1356         void *handle = NULL;
1357         struct mds_body *request_body = NULL, *reply_body = NULL;
1358         struct dentry_params dp;
1359         struct iattr iattr = { 0 };
1360         struct llog_create_locks *lcl = NULL;
1361         ENTRY;
1362
1363         if (req && req->rq_reqmsg != NULL)
1364                 request_body = lustre_msg_buf(req->rq_reqmsg, offset,
1365                                               sizeof(*request_body));
1366         if (req && req->rq_repmsg != NULL)
1367                 reply_body = lustre_msg_buf(req->rq_repmsg, 0,
1368                                             sizeof(*reply_body));
1369
1370         idlen = ll_id2str(idname, inode->i_ino, inode->i_generation);
1371         CDEBUG(D_INODE, "inode %p ino %s nlink %d orphan %d\n", inode,
1372                idname, inode->i_nlink, mds_orphan_open_count(inode));
1373
1374         last_orphan = mds_orphan_open_dec_test(inode) &&
1375                 mds_inode_is_orphan(inode);
1376         UP_WRITE_I_ALLOC_SEM(inode);
1377
1378         /* this is half of the actual "close" */
1379         if (mfd->mfd_mode & FMODE_WRITE) {
1380                 rc = mds_put_write_access(mds, inode, request_body,
1381                                           last_orphan && unlink_orphan);
1382         } else if (mfd->mfd_mode & FMODE_EXEC) {
1383                 mds_allow_write_access(inode);
1384         }
1385
1386         if (last_orphan && unlink_orphan) {
1387                 struct lov_mds_md *lmm = NULL;
1388                 int stripe_count = 0;
1389                 LASSERT(rc == 0); /* mds_put_write_access must have succeeded */
1390
1391                 if (obd->obd_recovering) {
1392                         CDEBUG(D_HA, "not remove orphan %s until recovery"
1393                                " is over\n", idname);
1394                         GOTO(out, rc);
1395                 }
1396
1397                 CDEBUG(D_HA, "destroying orphan object %s\n", idname);
1398
1399                 if ((S_ISREG(inode->i_mode) && inode->i_nlink != 1) ||
1400                     (S_ISDIR(inode->i_mode) && inode->i_nlink != 2))
1401                         CERROR("found \"orphan\" %s %s with link count %d\n",
1402                                S_ISREG(inode->i_mode) ? "file" : "dir",
1403                                idname, inode->i_nlink);
1404                 /*
1405                  * sadly, there is no easy way to save pending_child from
1406                  * mds_reint_unlink() into mfd, so we need to re-lookup, but
1407                  * normally it will still be in the dcache.
1408                  */
1409                 down(&pending_dir->i_sem);
1410                 cleanup_phase = 1; /* up(i_sem) when finished */
1411                 pending_child = lookup_one_len(idname, mds->mds_pending_dir,
1412                                                idlen);
1413                 if (IS_ERR(pending_child))
1414                         GOTO(cleanup, rc = PTR_ERR(pending_child));
1415                 LASSERT(pending_child->d_inode != NULL);
1416
1417                 cleanup_phase = 2; /* dput(pending_child) when finished */
1418                 if (S_ISDIR(pending_child->d_inode->i_mode)) {
1419                         rc = vfs_rmdir(pending_dir, pending_child);
1420                         if (rc)
1421                                 CERROR("error unlinking orphan dir %s: rc %d\n",
1422                                        idname, rc);
1423                         goto out;
1424                 }
1425
1426                 if (req != NULL && req->rq_repmsg != NULL) {
1427                         lmm = lustre_msg_buf(req->rq_repmsg, 1, 0);
1428                         stripe_count = le32_to_cpu(lmm->lmm_stripe_count);
1429                 }
1430
1431                 handle = fsfilt_start_log(obd, pending_dir, FSFILT_OP_UNLINK,
1432                                           NULL, stripe_count);
1433                 if (IS_ERR(handle)) {
1434                         rc = PTR_ERR(handle);
1435                         handle = NULL;
1436                         GOTO(cleanup, rc);
1437                 }
1438
1439                 pending_child->d_fsdata = (void *) &dp;
1440                 dp.p_inum = 0;
1441                 dp.p_ptr = req;
1442                 rc = vfs_unlink(pending_dir, pending_child);
1443                 if (rc)
1444                         CERROR("error unlinking orphan %s: rc %d\n",
1445                                idname, rc);
1446
1447                 if (req != NULL && req->rq_repmsg != NULL &&
1448                     (reply_body->valid & OBD_MD_FLEASIZE) &&
1449                     mds_log_op_unlink(obd, pending_child->d_inode,
1450                                       lmm, req->rq_repmsg->buflens[1],
1451                                       lustre_msg_buf(req->rq_repmsg, 2, 0),
1452                                       req->rq_repmsg->buflens[2], &lcl) > 0) {
1453                         reply_body->valid |= OBD_MD_FLCOOKIE;
1454                 }
1455
1456                 goto out; /* Don't bother updating attrs on unlinked inode */
1457         }
1458
1459 #if 0
1460         if (request_body != NULL && mfd->mfd_mode & FMODE_WRITE && rc == 0) {
1461                 /* Update the on-disk attributes if this was the last write
1462                  * close, and all information was provided (i.e., rc == 0)
1463                  *
1464                  * XXX this should probably be abstracted with mds_reint_setattr
1465                  */
1466
1467                 if (request_body->valid & OBD_MD_FLMTIME &&
1468                     LTIME_S(request_body->mtime) > LTIME_S(inode->i_mtime)) {
1469                         LTIME_S(iattr.ia_mtime) = LTIME_S(request_body->mtime);
1470                         iattr.ia_valid |= ATTR_MTIME;
1471                 }
1472                 if (request_body->valid & OBD_MD_FLCTIME &&
1473                     LTIME_S(request_body->ctime) > LTIME_S(inode->i_ctime)) {
1474                         LTIME_S(iattr.ia_ctime) = LTIME_S(request_body->ctime);
1475                         iattr.ia_valid |= ATTR_CTIME;
1476                 }
1477
1478                 /* XXX can't set block count with fsfilt_setattr (!) */
1479                 if (request_body->valid & OBD_MD_FLSIZE) {
1480                         iattr.ia_valid |= ATTR_SIZE;
1481                         iattr.ia_size = request_body->size;
1482                 }
1483                 /* if (request_body->valid & OBD_MD_FLBLOCKS) {
1484                         iattr.ia_valid |= ATTR_BLOCKS;
1485                         iattr.ia_blocks = request_body->blocks
1486                 } */
1487
1488         }
1489 #endif
1490         if (request_body != NULL && request_body->valid & OBD_MD_FLATIME) {
1491                 /* Only start a transaction to write out only the atime if
1492                  * it is more out-of-date than the specified limit.  If we
1493                  * are already going to write out the atime then do it anyway.
1494                  * */
1495                 if ((request_body->atime >
1496                      LTIME_S(inode->i_atime) + MAX_ATIME_DIFF) ||
1497                     (iattr.ia_valid != 0 &&
1498                      request_body->atime > LTIME_S(inode->i_atime))) {
1499                         LTIME_S(iattr.ia_atime) = request_body->atime;
1500                         iattr.ia_valid |= ATTR_ATIME;
1501                 }
1502         }
1503
1504         if (iattr.ia_valid != 0) {
1505                 handle = fsfilt_start(obd, inode, FSFILT_OP_SETATTR, NULL);
1506                 if (IS_ERR(handle))
1507                         GOTO(cleanup, rc = PTR_ERR(handle));
1508                 rc = fsfilt_setattr(obd, mfd->mfd_dentry, handle, &iattr, 0);
1509                 if (rc)
1510                         CERROR("error in setattr(%s): rc %d\n", idname, rc);
1511         }
1512 out:
1513         /* If other clients have this file open for write, rc will be > 0 */
1514         if (rc > 0)
1515                 rc = 0;
1516         l_dput(mfd->mfd_dentry);
1517         mds_mfd_destroy(mfd);
1518
1519  cleanup:
1520         atomic_dec(&mds->mds_open_count);
1521         if (req != NULL && reply_body != NULL) {
1522                 rc = mds_finish_transno(mds, pending_dir, handle, req, rc, 0);
1523         } else if (handle) {
1524                 int err, force_sync = 0;
1525
1526                 if (req && req->rq_export)
1527                         force_sync = req->rq_export->exp_sync;
1528
1529                 err = fsfilt_commit(obd, mds->mds_sb, pending_dir, handle,
1530                                     force_sync);
1531                 if (err) {
1532                         CERROR("error committing close: %d\n", err);
1533                         if (!rc)
1534                                 rc = err;
1535                 }
1536         }
1537
1538         switch (cleanup_phase) {
1539         case 2:
1540                 if (lcl != NULL)
1541                         ptlrpc_save_llog_lock(req, lcl);
1542                 dput(pending_child);
1543         case 1:
1544                 up(&pending_dir->i_sem);
1545         }
1546         RETURN(rc);
1547 }
1548
1549 int mds_close(struct ptlrpc_request *req, int offset)
1550 {
1551         struct mds_export_data *med = &req->rq_export->exp_mds_data;
1552         struct obd_device *obd = req->rq_export->exp_obd;
1553         struct mds_body *body;
1554         struct mds_file_data *mfd;
1555         struct lvfs_run_ctxt saved;
1556         struct inode *inode;
1557         int rc, repsize[3] = {sizeof(struct mds_body),
1558                               obd->u.mds.mds_max_mdsize,
1559                               obd->u.mds.mds_max_cookiesize};
1560         ENTRY;
1561         MD_COUNTER_INCREMENT(obd, close);
1562
1563         rc = lustre_pack_reply(req, 3, repsize, NULL);
1564         if (rc) {
1565                 CERROR("lustre_pack_reply: rc = %d\n", rc);
1566                 req->rq_status = rc;
1567         } else {
1568                 MDS_CHECK_RESENT(req, mds_reconstruct_generic(req));
1569         }
1570
1571         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1572                 DEBUG_REQ(D_HA, req, "close replay\n");
1573                 memcpy(lustre_msg_buf(req->rq_repmsg, 2, 0),
1574                        lustre_msg_buf(req->rq_reqmsg, offset + 1, 0),
1575                        req->rq_repmsg->buflens[2]);
1576         }
1577
1578         body = lustre_swab_reqbuf(req, offset, sizeof(*body),
1579                                   lustre_swab_mds_body);
1580         if (body == NULL) {
1581                 CERROR("Can't unpack body\n");
1582                 req->rq_status = -EFAULT;
1583                 RETURN(-EFAULT);
1584         }
1585
1586         if (body->flags & MDS_BFLAG_UNCOMMITTED_WRITES)
1587                 /* do some stuff */ ;
1588
1589         mfd = mds_handle2mfd(&body->handle);
1590         if (mfd == NULL) {
1591                 DEBUG_REQ(D_ERROR, req, "no handle for file close ino "LPD64
1592                           ": cookie "LPX64, id_ino(&body->id1), body->handle.cookie);
1593                 req->rq_status = -ESTALE;
1594                 RETURN(-ESTALE);
1595         }
1596
1597         inode = mfd->mfd_dentry->d_inode;
1598         /* child i_alloc_sem protects orphan_dec_test && is_orphan race */
1599         DOWN_WRITE_I_ALLOC_SEM(inode); /* mds_mfd_close drops this */
1600         if (mds_inode_is_orphan(inode) && mds_orphan_open_count(inode) == 1) {
1601                 struct mds_body *rep_body;
1602
1603                 rep_body = lustre_msg_buf(req->rq_repmsg, 0,
1604                                           sizeof (*rep_body));
1605                 LASSERT(rep_body != NULL);
1606
1607                 mds_pack_inode2body(obd, rep_body, inode,
1608                                     (body->valid & OBD_MD_FID) ? 1 : 0);
1609
1610                 mds_pack_md(obd, req->rq_repmsg, 1, rep_body,
1611                             inode, MDS_PACK_MD_LOCK, 0);
1612         }
1613         spin_lock(&med->med_open_lock);
1614         list_del(&mfd->mfd_list);
1615         spin_unlock(&med->med_open_lock);
1616
1617         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1618         req->rq_status = mds_mfd_close(req, offset, obd, mfd, 1);
1619         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1620
1621         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_CLOSE_PACK)) {
1622                 CERROR("test case OBD_FAIL_MDS_CLOSE_PACK\n");
1623                 req->rq_status = -ENOMEM;
1624                 mds_mfd_put(mfd);
1625                 RETURN(-ENOMEM);
1626         }
1627
1628         mds_mfd_put(mfd);
1629         RETURN(0);
1630 }
1631
1632 int mds_done_writing(struct ptlrpc_request *req, int offset)
1633 {
1634         struct mds_body *body;
1635         int rc, size = sizeof(struct mds_body);
1636         ENTRY;
1637
1638         MDS_CHECK_RESENT(req, mds_reconstruct_generic(req));
1639
1640         body = lustre_swab_reqbuf(req, offset, sizeof(*body),
1641                                   lustre_swab_mds_body);
1642         if (body == NULL) {
1643                 CERROR("Can't unpack body\n");
1644                 req->rq_status = -EFAULT;
1645                 RETURN(-EFAULT);
1646         }
1647
1648         rc = lustre_pack_reply(req, 1, &size, NULL);
1649         if (rc) {
1650                 CERROR("lustre_pack_reply: rc = %d\n", rc);
1651                 req->rq_status = rc;
1652         }
1653
1654         RETURN(0);
1655 }