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
 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
 135 /* Write access to a file: executors cause a negative count,
 136  * writers a positive count.  The semaphore is needed to perform
 137  * a check for the sign and then increment or decrement atomically.
 138  *
 139  * This code is closely tied to the allocation of the d_fsdata and the
 140  * MDS epoch, so we use the same semaphore for the whole lot.
 141  *
 142  * We could use a different semaphore for each file, if it ever shows
 143  * up in a profile, which it won't.
 144  *
 145  * epoch argument is nonzero during recovery */
 146 static int mds_get_write_access(struct mds_obd *mds, struct inode *inode,
 147                                 __u64 epoch)
 148 {
 149         int rc = 0;
 150
 151         down(&mds->mds_epoch_sem);
 152
 153         if (atomic_read(&inode->i_writecount) < 0) {
 154                 up(&mds->mds_epoch_sem);
 155                 RETURN(-ETXTBSY);
 156         }
 157
 158
 159         if (MDS_FILTERDATA(inode) && MDS_FILTERDATA(inode)->io_epoch != 0) {
 160                 CDEBUG(D_INODE, "continuing MDS epoch "LPU64" for ino %lu/%u\n",
 161                        MDS_FILTERDATA(inode)->io_epoch, inode->i_ino,
 162                        inode->i_generation);
 163                 goto out;
 164         }
 165
 166         if (inode->i_filterdata == NULL)
 167                 mds_alloc_filterdata(inode);
 168         if (inode->i_filterdata == NULL) {
 169                 rc = -ENOMEM;
 170                 goto out;
 171         }
 172         if (epoch > mds->mds_io_epoch)
 173                 mds->mds_io_epoch = epoch;
 174         else
 175                 mds->mds_io_epoch++;
 176         MDS_FILTERDATA(inode)->io_epoch = mds->mds_io_epoch;
 177         CDEBUG(D_INODE, "starting MDS epoch "LPU64" for ino %lu/%u\n",
 178                mds->mds_io_epoch, inode->i_ino, inode->i_generation);
 179  out:
 180         if (rc == 0)
 181                 atomic_inc(&inode->i_writecount);
 182         up(&mds->mds_epoch_sem);
 183         return rc;
 184 }
 185
 186 /* Returns EAGAIN if the client needs to get size and/or cookies and close
 187  * again -- which is never true if the file is about to be unlinked.  Otherwise
 188  * returns the number of remaining writers. */
 189 static int mds_put_write_access(struct mds_obd *mds, struct inode *inode,
 190                                 struct mds_body *body, int unlinking)
 191 {
 192         int rc = 0;
 193         ENTRY;
 194
 195         down(&mds->mds_epoch_sem);
 196         atomic_dec(&inode->i_writecount);
 197         rc = atomic_read(&inode->i_writecount);
 198         if (rc > 0)
 199                 GOTO(out, rc);
 200 #if 0
 201         if (!unlinking && !(body->valid & OBD_MD_FLSIZE))
 202                 GOTO(out, rc = EAGAIN);
 203 #endif
 204         mds_free_filterdata(inode);
 205  out:
 206         up(&mds->mds_epoch_sem);
 207         return rc;
 208 }
 209
 210 static int mds_deny_write_access(struct mds_obd *mds, struct inode *inode)
 211 {
 212         ENTRY;
 213         down(&mds->mds_epoch_sem);
 214         if (atomic_read(&inode->i_writecount) > 0) {
 215                 up(&mds->mds_epoch_sem);
 216                 RETURN(-ETXTBSY);
 217         }
 218         atomic_dec(&inode->i_writecount);
 219         up(&mds->mds_epoch_sem);
 220         RETURN(0);
 221 }
 222
 223 static void mds_allow_write_access(struct inode *inode)
 224 {
 225         ENTRY;
 226         atomic_inc(&inode->i_writecount);
 227 }
 228
 229 int mds_query_write_access(struct inode *inode)
 230 {
 231         ENTRY;
 232         RETURN(atomic_read(&inode->i_writecount));
 233 }
 234
 235 /* This replaces the VFS dentry_open, it manages mfd and writecount */
 236 static struct mds_file_data *mds_dentry_open(struct dentry *dentry,
 237                                              struct vfsmount *mnt, int flags,
 238                                              struct ptlrpc_request *req)
 239 {
 240         struct mds_export_data *med = &req->rq_export->exp_mds_data;
 241         struct mds_obd *mds = mds_req2mds(req);
 242         struct mds_file_data *mfd;
 243         struct mds_body *body;
 244         int error;
 245         ENTRY;
 246
 247         mfd = mds_mfd_new();
 248         if (mfd == NULL) {
 249                 CERROR("mds: out of memory\n");
 250                 GOTO(cleanup_dentry, error = -ENOMEM);
 251         }
 252
 253         body = lustre_msg_buf(req->rq_repmsg, 1, sizeof (*body));
 254
 255         if (flags & FMODE_WRITE) {
 256                 /* FIXME: in recovery, need to pass old epoch here */
 257                 error = mds_get_write_access(mds, dentry->d_inode, 0);
 258                 if (error)
 259                         GOTO(cleanup_mfd, error);
 260                 body->io_epoch = MDS_FILTERDATA(dentry->d_inode)->io_epoch;
 261         } else if (flags & FMODE_EXEC) {
 262                 error = mds_deny_write_access(mds, dentry->d_inode);
 263                 if (error)
 264                         GOTO(cleanup_mfd, error);
 265         }
 266
 267         dget(dentry);
 268
 269         /* Mark the file as open to handle open-unlink. */
 270
 271         DOWN_WRITE_I_ALLOC_SEM(dentry->d_inode);
 272         mds_orphan_open_inc(dentry->d_inode);
 273         UP_WRITE_I_ALLOC_SEM(dentry->d_inode);
 274
 275         mfd->mfd_mode = flags;
 276         mfd->mfd_dentry = dentry;
 277         mfd->mfd_xid = req->rq_xid;
 278
 279         spin_lock(&med->med_open_lock);
 280         list_add(&mfd->mfd_list, &med->med_open_head);
 281         spin_unlock(&med->med_open_lock);
 282         mds_mfd_put(mfd);
 283
 284         body->handle.cookie = mfd->mfd_handle.h_cookie;
 285
 286         RETURN(mfd);
 287
 288 cleanup_mfd:
 289         mds_mfd_put(mfd);
 290         mds_mfd_destroy(mfd);
 291 cleanup_dentry:
 292         return ERR_PTR(error);
 293 }
 294
 295 static void mds_objids_from_lmm(obd_id *ids, struct lov_mds_md *lmm,
 296                                 struct lov_desc *desc)
 297 {
 298         int i;
 299         for (i = 0; i < le32_to_cpu(lmm->lmm_stripe_count); i++) {
 300                 ids[le32_to_cpu(lmm->lmm_objects[i].l_ost_idx)] =
 301                         le64_to_cpu(lmm->lmm_objects[i].l_object_id);
 302         }
 303 }
 304
 305 /* Must be called with i_sem held */
 306 static int mds_create_objects(struct ptlrpc_request *req, int offset,
 307                               struct mds_update_record *rec,
 308                               struct mds_obd *mds, struct obd_device *obd,
 309                               struct dentry *dchild, void **handle,
 310                               obd_id **ids)
 311 {
 312         struct obdo *oa = NULL;
 313         struct obd_trans_info oti = { 0 };
 314         struct mds_body *body;
 315         struct lov_stripe_md *lsm = NULL;
 316         struct lov_mds_md *lmm = NULL;
 317         struct inode *inode = dchild->d_inode;
 318         void *lmm_buf;
 319         int rc, lmm_bufsize, lmm_size;
 320         ENTRY;
 321
 322         if (rec->ur_flags & MDS_OPEN_DELAY_CREATE ||
 323             !(rec->ur_flags & FMODE_WRITE))
 324                 RETURN(0);
 325
 326         body = lustre_msg_buf(req->rq_repmsg, 1, sizeof(*body));
 327
 328         if (!S_ISREG(inode->i_mode))
 329                 RETURN(0);
 330         if (body->valid & OBD_MD_FLEASIZE)
 331                 RETURN(0);
 332
 333         OBD_ALLOC(*ids, mds->mds_lov_desc.ld_tgt_count * sizeof(**ids));
 334         if (*ids == NULL)
 335                 RETURN(-ENOMEM);
 336         oti.oti_objid = *ids;
 337
 338         /* replay case */
 339         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
 340                 LASSERT (rec->ur_fid2->id);
 341                 body->valid |= OBD_MD_FLBLKSZ | OBD_MD_FLEASIZE;
 342                 lmm_size = rec->ur_eadatalen;
 343                 lmm = rec->ur_eadata;
 344                 LASSERT(lmm);
 345
 346                 if (*handle == NULL)
 347                         *handle = fsfilt_start(obd,inode,FSFILT_OP_CREATE,NULL);
 348                 if (IS_ERR(*handle)) {
 349                         rc = PTR_ERR(*handle);
 350                         *handle = NULL;
 351                         GOTO(out_oa, rc);
 352                 }
 353
 354                 mds_objids_from_lmm(*ids, lmm, &mds->mds_lov_desc);
 355
 356                 lmm_buf = lustre_msg_buf(req->rq_repmsg, offset, 0);
 357                 lmm_bufsize = req->rq_repmsg->buflens[offset];
 358                 LASSERT(lmm_buf);
 359                 LASSERT(lmm_bufsize >= lmm_size);
 360                 memcpy(lmm_buf, lmm, lmm_size);
 361                 rc = fsfilt_set_md(obd, inode, *handle, lmm, lmm_size);
 362                 if (rc)
 363                         CERROR("open replay failed to set md:%d\n", rc);
 364                 RETURN(0);
 365         }
 366
 367         if (OBD_FAIL_CHECK_ONCE(OBD_FAIL_MDS_ALLOC_OBDO))
 368                 GOTO(out_ids, rc = -ENOMEM);
 369
 370         oa = obdo_alloc();
 371         if (oa == NULL)
 372                 GOTO(out_ids, rc = -ENOMEM);
 373         oa->o_mode = S_IFREG | 0600;
 374         oa->o_id = inode->i_ino;
 375         oa->o_gr = FILTER_GROUP_FIRST_MDS + mds->mds_num;
 376         oa->o_generation = inode->i_generation;
 377         oa->o_uid = 0; /* must have 0 uid / gid on OST */
 378         oa->o_gid = 0;
 379         oa->o_valid = OBD_MD_FLID | OBD_MD_FLGENER | OBD_MD_FLTYPE |
 380                 OBD_MD_FLMODE | OBD_MD_FLUID | OBD_MD_FLGID | OBD_MD_FLGROUP;
 381         oa->o_size = 0;
 382
 383         obdo_from_inode(oa, inode, OBD_MD_FLTYPE|OBD_MD_FLATIME|OBD_MD_FLMTIME|
 384                         OBD_MD_FLCTIME);
 385
 386         if (!(rec->ur_flags & MDS_OPEN_HAS_OBJS)) {
 387                 /* check if things like lfs setstripe are sending us the ea */
 388                 if (rec->ur_flags & MDS_OPEN_HAS_EA) {
 389                         rc = obd_iocontrol(OBD_IOC_LOV_SETSTRIPE,
 390                                            mds->mds_osc_exp,
 391                                            0, &lsm, rec->ur_eadata);
 392                         if (rc)
 393                                 GOTO(out_oa, rc);
 394                 } else {
 395                         /* Per-directory striping default code removed, because
 396                          * it uses the same unnamed EA storage as the directory
 397                          * striping for CMD. -p */
 398                 }
 399                 LASSERT(oa->o_gr >= FILTER_GROUP_FIRST_MDS);
 400                 rc = obd_create(mds->mds_osc_exp, oa, &lsm, &oti);
 401                 if (rc) {
 402                         int level = D_ERROR;
 403                         if (rc == -ENOSPC)
 404                                 level = D_INODE;
 405                         CDEBUG(level, "error creating objects for "
 406                                       "inode %lu: rc = %d\n",
 407                                inode->i_ino, rc);
 408                         if (rc > 0) {
 409                                 CERROR("obd_create returned invalid "
 410                                        "rc %d\n", rc);
 411                                 rc = -EIO;
 412                         }
 413                         GOTO(out_oa, rc);
 414                 }
 415         } else {
 416                 rc = obd_iocontrol(OBD_IOC_LOV_SETEA, mds->mds_osc_exp,
 417                                    0, &lsm, rec->ur_eadata);
 418                 if (rc) {
 419                         GOTO(out_oa, rc);
 420                 }
 421                 lsm->lsm_object_id = oa->o_id;
 422                 lsm->lsm_object_gr = oa->o_gr;
 423         }
 424         if (inode->i_size) {
 425                 oa->o_size = inode->i_size;
 426                 obdo_from_inode(oa, inode, OBD_MD_FLTYPE|OBD_MD_FLATIME|
 427                                 OBD_MD_FLMTIME| OBD_MD_FLCTIME| OBD_MD_FLSIZE);
 428                 rc = obd_setattr(mds->mds_osc_exp, oa, lsm, &oti);
 429                 if (rc) {
 430                         CERROR("error setting attrs for inode %lu: rc %d\n",
 431                                inode->i_ino, rc);
 432                         if (rc > 0) {
 433                                 CERROR("obd_setattr returned bad rc %d\n", rc);
 434                                 rc = -EIO;
 435                         }
 436                         GOTO(out_oa, rc);
 437                 }
 438         }
 439
 440         body->valid |= OBD_MD_FLBLKSZ | OBD_MD_FLEASIZE;
 441         obdo_refresh_inode(inode, oa, OBD_MD_FLBLKSZ);
 442
 443         LASSERT(lsm && lsm->lsm_object_id);
 444         lmm = NULL;
 445         rc = obd_packmd(mds->mds_osc_exp, &lmm, lsm);
 446         if (!rec->ur_fid2->id)
 447                 obd_free_memmd(mds->mds_osc_exp, &lsm);
 448         LASSERT(rc >= 0);
 449         lmm_size = rc;
 450         body->eadatasize = rc;
 451
 452         if (*handle == NULL)
 453                 *handle = fsfilt_start(obd, inode, FSFILT_OP_CREATE, NULL);
 454         if (IS_ERR(*handle)) {
 455                 rc = PTR_ERR(*handle);
 456                 *handle = NULL;
 457                 GOTO(out_ids, rc);
 458         }
 459
 460         rc = fsfilt_set_md(obd, inode, *handle, lmm, lmm_size);
 461         lmm_buf = lustre_msg_buf(req->rq_repmsg, offset, 0);
 462         lmm_bufsize = req->rq_repmsg->buflens[offset];
 463         LASSERT(lmm_buf);
 464         LASSERT(lmm_bufsize >= lmm_size);
 465
 466         memcpy(lmm_buf, lmm, lmm_size);
 467         obd_free_diskmd(mds->mds_osc_exp, &lmm);
 468  out_oa:
 469         oti_free_cookies(&oti);
 470         obdo_free(oa);
 471  out_ids:
 472         if (rc) {
 473                 OBD_FREE(*ids, mds->mds_lov_desc.ld_tgt_count * sizeof(**ids));
 474                 *ids = NULL;
 475         }
 476         RETURN(rc);
 477 }
 478
 479 static void reconstruct_open(struct mds_update_record *rec, int offset,
 480                              struct ptlrpc_request *req,
 481                              struct lustre_handle *child_lockh)
 482 {
 483         struct mds_export_data *med = &req->rq_export->exp_mds_data;
 484         struct mds_client_data *mcd = med->med_mcd;
 485         struct mds_obd *mds = mds_req2mds(req);
 486         struct mds_file_data *mfd;
 487         struct obd_device *obd = req->rq_export->exp_obd;
 488         struct dentry *parent, *dchild;
 489         struct ldlm_reply *rep;
 490         struct mds_body *body;
 491         int rc;
 492         struct list_head *t;
 493         int put_child = 1;
 494         ENTRY;
 495
 496         LASSERT(offset == 3); /* only called via intent */
 497         rep = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*rep));
 498         body = lustre_msg_buf(req->rq_repmsg, 1, sizeof (*body));
 499
 500         /* copy rc, transno and disp; steal locks */
 501         mds_req_from_mcd(req, mcd);
 502         intent_set_disposition(rep, mcd->mcd_last_data);
 503
 504         /* Only replay if create or open actually happened. */
 505         if (!intent_disposition(rep, DISP_OPEN_CREATE | DISP_OPEN_OPEN) ) {
 506                 EXIT;
 507                 return; /* error looking up parent or child */
 508         }
 509
 510         parent = mds_fid2dentry(mds, rec->ur_fid1, NULL);
 511         LASSERTF(!IS_ERR(parent), "fid "LPU64"/%u rc %ld\n", rec->ur_fid1->id,
 512                  rec->ur_fid1->generation, PTR_ERR(parent));
 513
 514         dchild = ll_lookup_one_len(rec->ur_name, parent, rec->ur_namelen - 1);
 515         LASSERTF(!IS_ERR(dchild), "parent "LPU64"/%u child %s rc %ld\n",
 516                  rec->ur_fid1->id, rec->ur_fid1->generation, rec->ur_name,
 517                  PTR_ERR(dchild));
 518
 519         if (!dchild->d_inode)
 520                 GOTO(out_dput, 0); /* child not present to open */
 521
 522         /* At this point, we know we have a child. We'll send
 523          * it back _unless_ it not created and open failed.  */
 524         if (intent_disposition(rep, DISP_OPEN_OPEN) &&
 525             !intent_disposition(rep, DISP_OPEN_CREATE) &&
 526             req->rq_status)
 527                 GOTO(out_dput, 0);
 528
 529         mds_pack_inode2fid(obd, &body->fid1, dchild->d_inode);
 530         mds_pack_inode2body(obd, body, dchild->d_inode);
 531         if (S_ISREG(dchild->d_inode->i_mode)) {
 532                 rc = mds_pack_md(obd, req->rq_repmsg, 2, body,
 533                                  dchild->d_inode, 1);
 534
 535                 if (rc)
 536                         LASSERT(rc == req->rq_status);
 537
 538                 /* If we have LOV EA data, the OST holds size, mtime */
 539                 if (!(body->valid & OBD_MD_FLEASIZE))
 540                         body->valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
 541                                         OBD_MD_FLATIME | OBD_MD_FLMTIME);
 542         }
 543
 544         /* If we have -EEXIST as the status, and we were asked to create
 545          * exclusively, we can tell we failed because the file already existed.
 546          */
 547         if (req->rq_status == -EEXIST &&
 548             ((rec->ur_flags & (MDS_OPEN_CREAT | MDS_OPEN_EXCL)) ==
 549              (MDS_OPEN_CREAT | MDS_OPEN_EXCL))) {
 550                 GOTO(out_dput, 0);
 551         }
 552
 553         /* If we didn't get as far as trying to open, then some locking thing
 554          * probably went wrong, and we'll just bail here.
 555          */
 556         if (!intent_disposition(rep, DISP_OPEN_OPEN))
 557                 GOTO(out_dput, 0);
 558
 559         /* If we failed, then we must have failed opening, so don't look for
 560          * file descriptor or anything, just give the client the bad news.
 561          */
 562         if (req->rq_status)
 563                 GOTO(out_dput, 0);
 564
 565         mfd = NULL;
 566         list_for_each(t, &med->med_open_head) {
 567                 mfd = list_entry(t, struct mds_file_data, mfd_list);
 568                 if (mfd->mfd_xid == req->rq_xid)
 569                         break;
 570                 mfd = NULL;
 571         }
 572
 573         /* #warning "XXX fixme" bug 2991 */
 574         /* Here it used to LASSERT(mfd) if exp_outstanding_reply != NULL.
 575          * Now that exp_outstanding_reply is a list, it's just using mfd != NULL
 576          * to detect a re-open */
 577         if (mfd == NULL) {
 578                 mntget(mds->mds_vfsmnt);
 579                 CERROR("Re-opened file \n");
 580                 mfd = mds_dentry_open(dchild, mds->mds_vfsmnt,
 581                                       rec->ur_flags & ~MDS_OPEN_TRUNC, req);
 582                 if (!mfd) {
 583                         CERROR("mds: out of memory\n");
 584                         GOTO(out_dput, req->rq_status = -ENOMEM);
 585                 }
 586                 put_child = 0;
 587         } else {
 588                 body->handle.cookie = mfd->mfd_handle.h_cookie;
 589                 CDEBUG(D_INODE, "resend mfd %p, cookie "LPX64"\n", mfd,
 590                        mfd->mfd_handle.h_cookie);
 591         }
 592
 593  out_dput:
 594         if (put_child)
 595                 l_dput(dchild);
 596         l_dput(parent);
 597         EXIT;
 598 }
 599
 600 /* do NOT or the MAY_*'s, you'll get the weakest */
 601 static int accmode(int flags)
 602 {
 603         int res = 0;
 604
 605         if (flags & FMODE_READ)
 606                 res = MAY_READ;
 607         if (flags & (FMODE_WRITE|MDS_OPEN_TRUNC))
 608                 res |= MAY_WRITE;
 609         if (flags & FMODE_EXEC)
 610                 res = MAY_EXEC;
 611         return res;
 612 }
 613
 614 /* Handles object creation, actual opening, and I/O epoch */
 615 static int mds_finish_open(struct ptlrpc_request *req, struct dentry *dchild,
 616                            struct mds_body *body, int flags, void **handle,
 617                            struct mds_update_record *rec,struct ldlm_reply *rep)
 618 {
 619         struct mds_obd *mds = mds_req2mds(req);
 620         struct obd_device *obd = req->rq_export->exp_obd;
 621         struct mds_file_data *mfd = NULL;
 622         obd_id *ids = NULL; /* object IDs created */
 623         unsigned mode;
 624         int rc = 0;
 625         ENTRY;
 626
 627         /* atomically create objects if necessary */
 628         down(&dchild->d_inode->i_sem);
 629         mode = dchild->d_inode->i_mode;
 630         if ((S_ISREG(mode) && !(body->valid & OBD_MD_FLEASIZE)) ||
 631             (S_ISDIR(mode) && !(body->valid & OBD_MD_FLDIREA))) {
 632                 rc = mds_pack_md(obd, req->rq_repmsg, 2, body,
 633                                  dchild->d_inode, 0);
 634                 if (rc) {
 635                         up(&dchild->d_inode->i_sem);
 636                         RETURN(rc);
 637                 }
 638         }
 639         if (rec != NULL) {
 640                 /* no EA: create objects */
 641                 if ((body->valid & OBD_MD_FLEASIZE) &&
 642                     (rec->ur_flags & MDS_OPEN_HAS_EA)) {
 643                         up(&dchild->d_inode->i_sem);
 644                         RETURN(-EEXIST);
 645                 }
 646                 if (!(body->valid & OBD_MD_FLEASIZE)) {
 647                         /* no EA: create objects */
 648                         rc = mds_create_objects(req, 2, rec, mds, obd,
 649                                                 dchild, handle, &ids);
 650                         if (rc) {
 651                                 CERROR("mds_create_objects: rc = %d\n", rc);
 652                                 up(&dchild->d_inode->i_sem);
 653                                 RETURN(rc);
 654                         }
 655                 }
 656                 if (S_ISREG(dchild->d_inode->i_mode) &&
 657                     (body->valid & OBD_MD_FLEASIZE)) {
 658                         rc = mds_revalidate_lov_ea(obd, dchild->d_inode,
 659                                                    req->rq_repmsg, 2);
 660                         if (!rc)
 661                                 rc = mds_pack_md(obd, req->rq_repmsg, 2, body,
 662                                                  dchild->d_inode, 0);
 663                         if (rc) {
 664                                 up(&dchild->d_inode->i_sem);
 665                                 RETURN(rc);
 666                         }
 667                 }
 668         }
 669         /* If the inode has no EA data, then MDSs hold size, mtime */
 670         if (S_ISREG(dchild->d_inode->i_mode) &&
 671             !(body->valid & OBD_MD_FLEASIZE)) {
 672                 body->valid |= (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
 673                                 OBD_MD_FLATIME | OBD_MD_FLMTIME);
 674         }
 675         up(&dchild->d_inode->i_sem);
 676
 677         intent_set_disposition(rep, DISP_OPEN_OPEN);
 678         mfd = mds_dentry_open(dchild, mds->mds_vfsmnt, flags, req);
 679         if (IS_ERR(mfd))
 680                 RETURN(PTR_ERR(mfd));
 681
 682         CDEBUG(D_INODE, "mfd %p, cookie "LPX64"\n", mfd,
 683                mfd->mfd_handle.h_cookie);
 684         if (ids != NULL) {
 685                 mds_lov_update_objids(obd, ids);
 686                 OBD_FREE(ids, sizeof(*ids) * mds->mds_lov_desc.ld_tgt_count);
 687         }
 688         //if (rc)
 689         //        mds_mfd_destroy(mfd);
 690         RETURN(rc);
 691 }
 692
 693 static int mds_open_by_fid(struct ptlrpc_request *req, struct ll_fid *fid,
 694                            struct mds_body *body, int flags,
 695                            struct mds_update_record *rec,struct ldlm_reply *rep)
 696 {
 697         struct mds_obd *mds = mds_req2mds(req);
 698         struct inode *pending_dir = mds->mds_pending_dir->d_inode;
 699         struct dentry *dchild;
 700         char fidname[LL_FID_NAMELEN];
 701         int fidlen = 0, rc;
 702         void *handle = NULL;
 703         ENTRY;
 704
 705         down(&pending_dir->i_sem);
 706         fidlen = ll_fid2str(fidname, fid->id, fid->generation);
 707         dchild = lookup_one_len(fidname, mds->mds_pending_dir, fidlen);
 708         if (IS_ERR(dchild)) {
 709                 up(&pending_dir->i_sem);
 710                 rc = PTR_ERR(dchild);
 711                 CERROR("error looking up %s in PENDING: rc = %d\n",fidname, rc);
 712                 RETURN(rc);
 713         }
 714
 715         if (dchild->d_inode != NULL) {
 716                 up(&pending_dir->i_sem);
 717                 mds_inode_set_orphan(dchild->d_inode);
 718                 mds_pack_inode2fid(req2obd(req), &body->fid1, dchild->d_inode);
 719                 mds_pack_inode2body(req2obd(req), body, dchild->d_inode);
 720                 intent_set_disposition(rep, DISP_LOOKUP_EXECD);
 721                 intent_set_disposition(rep, DISP_LOOKUP_POS);
 722                 CWARN("Orphan %s found and opened in PENDING directory\n",
 723                        fidname);
 724                 goto open;
 725         }
 726         dput(dchild);
 727         up(&pending_dir->i_sem);
 728
 729         /* We didn't find it in PENDING so it isn't an orphan.  See
 730          * if it was a regular inode that was previously created. */
 731         dchild = mds_fid2dentry(mds, fid, NULL);
 732         if (IS_ERR(dchild))
 733                 RETURN(PTR_ERR(dchild));
 734
 735         mds_pack_inode2fid(req2obd(req), &body->fid1, dchild->d_inode);
 736         mds_pack_inode2body(req2obd(req), body, dchild->d_inode);
 737         intent_set_disposition(rep, DISP_LOOKUP_EXECD);
 738         intent_set_disposition(rep, DISP_LOOKUP_POS);
 739
 740  open:
 741         rc = mds_finish_open(req, dchild, body, flags, &handle, rec, rep);
 742         rc = mds_finish_transno(mds, dchild ? dchild->d_inode : NULL, handle,
 743                                 req, rc, rep ? rep->lock_policy_res1 : 0);
 744         /* XXX what do we do here if mds_finish_transno itself failed? */
 745
 746         l_dput(dchild);
 747         RETURN(rc);
 748 }
 749
 750 int mds_pin(struct ptlrpc_request *req, int offset)
 751 {
 752         struct obd_device *obd = req->rq_export->exp_obd;
 753         struct mds_body *request_body, *reply_body;
 754         struct lvfs_run_ctxt saved;
 755         int rc, size = sizeof(*reply_body);
 756         ENTRY;
 757
 758         request_body = lustre_msg_buf(req->rq_reqmsg, offset,
 759                                       sizeof(*request_body));
 760
 761         rc = lustre_pack_reply(req, 1, &size, NULL);
 762         if (rc)
 763                 RETURN(rc);
 764         reply_body = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*reply_body));
 765
 766         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 767         rc = mds_open_by_fid(req, &request_body->fid1, reply_body,
 768                              request_body->flags, NULL, NULL);
 769         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 770
 771         RETURN(rc);
 772 }
 773
 774 /*  Get a lock on the ino to sync with creation WRT inode reuse (bug 2029).
 775  *  If child_lockh is NULL we just get the lock as a barrier to wait for
 776  *  other holders of this lock, and drop it right away again. */
 777 int mds_lock_new_child(struct obd_device *obd, struct inode *inode,
 778                        struct lustre_handle *child_lockh)
 779 {
 780         struct ldlm_res_id child_res_id = { .name = { inode->i_ino, 0, 1, 0 } };
 781         struct lustre_handle lockh;
 782         int lock_flags = 0;
 783         int rc;
 784
 785         if (child_lockh == NULL)
 786                 child_lockh = &lockh;
 787
 788         rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace, child_res_id,
 789                               LDLM_PLAIN, NULL, LCK_EX, &lock_flags,
 790                               mds_blocking_ast, ldlm_completion_ast, NULL, NULL,
 791                               NULL, 0, NULL, child_lockh);
 792         if (rc != ELDLM_OK)
 793                 CERROR("ldlm_cli_enqueue: %d\n", rc);
 794         else if (child_lockh == &lockh)
 795                 ldlm_lock_decref(child_lockh, LCK_EX);
 796
 797         RETURN(rc);
 798 }
 799
 800 static int is_mount_object(struct dentry *dparent)
 801 {
 802         struct dentry *dchild;
 803
 804         if (!(dparent->d_inode->i_mode & S_ISUID))
 805                 return 0;
 806
 807         dchild = lookup_one_len(".mntinfo", dparent, strlen(".mntinfo"));
 808         if (IS_ERR(dchild) || dchild == NULL)
 809                 return 0;
 810
 811         dput(dchild);
 812         return 1;
 813 }
 814
 815 int mds_open(struct mds_update_record *rec, int offset,
 816              struct ptlrpc_request *req, struct lustre_handle *child_lockh)
 817 {
 818         /* XXX ALLOCATE _something_ - 464 bytes on stack here */
 819         struct obd_device *obd = req->rq_export->exp_obd;
 820         struct mds_obd *mds = mds_req2mds(req);
 821         struct ldlm_reply *rep = NULL;
 822         struct mds_body *body = NULL;
 823         struct dentry *dchild = NULL, *dparent = NULL;
 824         struct mds_export_data *med;
 825         struct lustre_handle parent_lockh[2];
 826         int rc = 0, cleanup_phase = 0, acc_mode, created = 0;
 827         int parent_mode = LCK_PR;
 828         void *handle = NULL;
 829         struct dentry_params dp;
 830         struct mea *mea = NULL;
 831         int mea_size, update_mode;
 832         ENTRY;
 833
 834         DEBUG_REQ(D_INODE, req, "parent "LPU64"/%u name %*s mode %o",
 835                   rec->ur_fid1->id, rec->ur_fid1->generation,
 836                   rec->ur_namelen - 1, rec->ur_name, rec->ur_mode);
 837
 838         parent_lockh[0].cookie = 0;
 839         parent_lockh[1].cookie = 0;
 840
 841         if (offset == 3) { /* intent */
 842                 rep = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*rep));
 843                 body = lustre_msg_buf(req->rq_repmsg, 1, sizeof (*body));
 844         } else if (offset == 1) { /* non-intent reint */
 845                 body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body));
 846         } else {
 847                 body = NULL;
 848                 LBUG();
 849         }
 850
 851         MDS_CHECK_RESENT(req, reconstruct_open(rec, offset, req, child_lockh));
 852
 853         MDS_UPDATE_COUNTER(mds, MDS_OPEN_COUNT);
 854
 855         /* Step 0: If we are passed a fid, then we assume the client already
 856          * opened this file and is only replaying the RPC, so we open the
 857          * inode by fid (at some large expense in security). */
 858         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
 859                 CDEBUG(D_HA, "open fid "LPU64"/%u name %*s mode %o\n",
 860                           rec->ur_fid2->id, rec->ur_fid2->generation,
 861                           rec->ur_namelen - 1, rec->ur_name, rec->ur_mode);
 862
 863                 LASSERT(rec->ur_fid2->id);
 864
 865                 rc = mds_open_by_fid(req, rec->ur_fid2, body, rec->ur_flags,
 866                                      rec, rep);
 867                 if (rc != -ENOENT)
 868                         RETURN(rc);
 869                 /* We didn't find the correct inode on disk either, so we
 870                  * need to re-create it via a regular replay. */
 871                 LASSERT(rec->ur_flags & MDS_OPEN_CREAT);
 872         } else {
 873                 LASSERT(!rec->ur_fid2->id);
 874         }
 875
 876         LASSERT(offset == 3); /* If we got here, we must be called via intent */
 877
 878         med = &req->rq_export->exp_mds_data;
 879         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_OPEN_PACK)) {
 880                 CERROR("test case OBD_FAIL_MDS_OPEN_PACK\n");
 881                 RETURN(-ENOMEM);
 882         }
 883
 884         acc_mode = accmode(rec->ur_flags);
 885
 886         /* Step 1: Find and lock the parent */
 887         if (rec->ur_flags & O_CREAT) {
 888                 /* XXX Well, in fact we only need this lock mode change if
 889                    in addition to O_CREAT, the file does not exist.
 890                    But we do not know if it exists or not yet */
 891                 parent_mode = LCK_PW;
 892         }
 893
 894         if (rec->ur_namelen == 1) {
 895                 /* client (LMV) wants to open the file by fid */
 896                 CDEBUG(D_OTHER, "OPEN by fid %u/%u/%u\n",
 897                                 (unsigned) rec->ur_fid1->mds,
 898                                 (unsigned) rec->ur_fid1->id,
 899                                 (unsigned) rec->ur_fid1->generation);
 900                 dchild = mds_fid2dentry(mds, rec->ur_fid1, NULL);
 901                 if (IS_ERR(dchild)) {
 902                         rc = PTR_ERR(dparent);
 903                         CERROR("child lookup by a fid error %d\n", rc);
 904                         GOTO(cleanup, rc);
 905                 }
 906                 goto got_child;
 907         }
 908
 909         dparent = mds_fid2locked_dentry(obd, rec->ur_fid1, NULL, parent_mode,
 910                                         parent_lockh, &update_mode, rec->ur_name,
 911                                         rec->ur_namelen - 1,
 912                                         MDS_INODELOCK_UPDATE);
 913         if (IS_ERR(dparent)) {
 914                 rc = PTR_ERR(dparent);
 915                 if (rc != -ENOENT)
 916                         CERROR("parent lookup error %d\n", rc);
 917                 GOTO(cleanup, rc);
 918         }
 919         LASSERT(dparent->d_inode != NULL);
 920
 921         cleanup_phase = 1; /* parent dentry and lock */
 922
 923         /* try to retrieve MEA data for this dir */
 924         rc = mds_get_lmv_attr(obd, dparent->d_inode, &mea, &mea_size);
 925         if (rc)
 926                 GOTO(cleanup, rc);
 927
 928         if (mea != NULL) {
 929                 /* dir is already splitted, check is requested filename
 930                  * should live at this MDS or at another one */
 931                 int i;
 932                 i = mea_name2idx(mea, rec->ur_name, rec->ur_namelen - 1);
 933                 if (mea->mea_master != mea->mea_fids[i].mds) {
 934                         CDEBUG(D_OTHER,
 935                                "%s: inapropriate MDS(%d) for %lu/%u:%s."
 936                                " should be %d(%d)\n", obd->obd_name,
 937                                mea->mea_master, dparent->d_inode->i_ino,
 938                                dparent->d_inode->i_generation, rec->ur_name,
 939                                mea->mea_fids[i].mds, i);
 940                         GOTO(cleanup, rc = -ERESTART);
 941                 }
 942         }
 943
 944         /* Step 2: Lookup the child */
 945         dchild = ll_lookup_one_len(rec->ur_name, dparent, rec->ur_namelen - 1);
 946         if (IS_ERR(dchild)) {
 947                 rc = PTR_ERR(dchild);
 948                 dchild = NULL; /* don't confuse mds_finish_transno() below */
 949                 GOTO(cleanup, rc);
 950         }
 951
 952 got_child:
 953         cleanup_phase = 2; /* child dentry */
 954
 955         intent_set_disposition(rep, DISP_LOOKUP_EXECD);
 956
 957         if (dchild->d_flags & DCACHE_CROSS_REF) {
 958                 struct ldlm_res_id res_id = { . name = {0} };
 959                 ldlm_policy_data_t policy;
 960                 int flags = 0;
 961                 CDEBUG(D_OTHER, "cross reference: %lu/%lu/%lu\n",
 962                        (unsigned long) dchild->d_mdsnum,
 963                        (unsigned long) dchild->d_inum,
 964                        (unsigned long) dchild->d_generation);
 965                 body->valid |= OBD_MD_FLID | OBD_MD_MDS;
 966                 body->fid1.id = dchild->d_inum;
 967                 body->fid1.mds = dchild->d_mdsnum;
 968                 body->fid1.generation = dchild->d_generation;
 969                 intent_set_disposition(rep, DISP_LOOKUP_POS);
 970                 res_id.name[0] = dchild->d_inum;
 971                 res_id.name[1] = dchild->d_generation;
 972                 policy.l_inodebits.bits = MDS_INODELOCK_LOOKUP;
 973                 rc = ldlm_cli_enqueue(NULL, NULL, obd->obd_namespace,
 974                                       res_id, LDLM_IBITS, &policy,
 975                                       LCK_PR, &flags,
 976                                       mds_blocking_ast,
 977                                       ldlm_completion_ast, NULL, NULL,
 978                                       NULL, 0, NULL, child_lockh);
 979 #ifdef S_PDIROPS
 980                 if (parent_lockh[1].cookie != 0)
 981                         ldlm_lock_decref(parent_lockh + 1, update_mode);
 982 #endif
 983                 ldlm_lock_decref(parent_lockh, parent_mode);
 984                 if (mea)
 985                         OBD_FREE(mea, mea_size);
 986                 l_dput(dchild);
 987                 l_dput(dparent);
 988                 RETURN(rc);
 989         }
 990
 991         if (dchild->d_inode)
 992                 intent_set_disposition(rep, DISP_LOOKUP_POS);
 993         else
 994                 intent_set_disposition(rep, DISP_LOOKUP_NEG);
 995
 996         /*Step 3: If the child was negative, and we're supposed to, create it.*/
 997         if (dchild->d_inode == NULL) {
 998                 unsigned long ino = rec->ur_fid2->id;
 999                 struct iattr iattr;
1000                 struct inode *inode;
1001                 rc = mds_try_to_split_dir(obd, dparent, &mea, 0, update_mode);
1002                 CDEBUG(D_OTHER, "%s: splitted %lu/%u - %d\n",
1003                        obd->obd_name, dparent->d_inode->i_ino,
1004                        dparent->d_inode->i_generation, rc);
1005                 if (rc > 0) {
1006                         /* dir got splitted */
1007                         GOTO(cleanup, rc = -ERESTART);
1008                 } else if (rc < 0) {
1009                         /* error happened during spitting */
1010                         GOTO(cleanup, rc);
1011                 }
1012
1013                 if (!(rec->ur_flags & MDS_OPEN_CREAT)) {
1014                         /* It's negative and we weren't supposed to create it */
1015                         GOTO(cleanup, rc = -ENOENT);
1016                 }
1017
1018                 intent_set_disposition(rep, DISP_OPEN_CREATE);
1019                 handle = fsfilt_start(obd, dparent->d_inode, FSFILT_OP_CREATE,
1020                                       NULL);
1021                 if (IS_ERR(handle)) {
1022                         rc = PTR_ERR(handle);
1023                         handle = NULL;
1024                         GOTO(cleanup, rc);
1025                 }
1026                 dchild->d_fsdata = (void *) &dp;
1027                 dp.p_ptr = req;
1028                 dp.p_inum = ino;
1029
1030                 rc = ll_vfs_create(dparent->d_inode, dchild, rec->ur_mode,NULL);
1031                 if (dchild->d_fsdata == (void *)(unsigned long)ino)
1032                         dchild->d_fsdata = NULL;
1033
1034                 if (rc) {
1035                         CDEBUG(D_INODE, "error during create: %d\n", rc);
1036                         GOTO(cleanup, rc);
1037                 }
1038                 inode = dchild->d_inode;
1039                 if (ino) {
1040                         LASSERT(ino == inode->i_ino);
1041                         /* Written as part of setattr */
1042                         inode->i_generation = rec->ur_fid2->generation;
1043                         CDEBUG(D_HA, "recreated ino %lu with gen %u\n",
1044                                inode->i_ino, inode->i_generation);
1045                 }
1046
1047                 created = 1;
1048                 LTIME_S(iattr.ia_atime) = rec->ur_time;
1049                 LTIME_S(iattr.ia_ctime) = rec->ur_time;
1050                 LTIME_S(iattr.ia_mtime) = rec->ur_time;
1051
1052                 iattr.ia_uid = rec->_ur_fsuid;
1053                 if (dparent->d_inode->i_mode & S_ISGID)
1054                         iattr.ia_gid = dparent->d_inode->i_gid;
1055                 else
1056                         iattr.ia_gid = rec->_ur_fsgid;
1057
1058                 iattr.ia_valid = ATTR_UID | ATTR_GID | ATTR_ATIME |
1059                         ATTR_MTIME | ATTR_CTIME;
1060
1061                 rc = fsfilt_setattr(obd, dchild, handle, &iattr, 0);
1062                 if (rc)
1063                         CERROR("error on child setattr: rc = %d\n", rc);
1064
1065                 iattr.ia_valid = ATTR_MTIME | ATTR_CTIME;
1066
1067                 rc = fsfilt_setattr(obd, dparent, handle, &iattr, 0);
1068                 if (rc)
1069                         CERROR("error on parent setattr: rc = %d\n", rc);
1070                 else
1071                         MDS_UPDATE_COUNTER(mds, MDS_CREATE_COUNT);
1072
1073                 if (!(rec->ur_flags & O_EXCL)) { /* bug 3313 */
1074                         rc = fsfilt_commit(obd, dchild->d_inode->i_sb,
1075                                            dchild->d_inode, handle, 0);
1076                         handle = NULL;
1077                 }
1078
1079                 acc_mode = 0;           /* Don't check for permissions */
1080         }
1081         LASSERTF(!mds_inode_is_orphan(dchild->d_inode),
1082                  "dchild %*s (%p) inode %p\n", dchild->d_name.len,
1083                  dchild->d_name.name, dchild, dchild->d_inode);
1084
1085         mds_pack_inode2fid(obd, &body->fid1, dchild->d_inode);
1086         mds_pack_inode2body(obd, body, dchild->d_inode);
1087
1088         if (S_ISREG(dchild->d_inode->i_mode)) {
1089                 /* Check permissions etc */
1090                 rc = ll_permission(dchild->d_inode, acc_mode, NULL);
1091                 if (rc != 0)
1092                         GOTO(cleanup, rc);
1093
1094                 /* Can't write to a read-only file */
1095                 if (IS_RDONLY(dchild->d_inode) && (acc_mode & MAY_WRITE) != 0)
1096                         GOTO(cleanup, rc = -EPERM);
1097
1098                 /* An append-only file must be opened in append mode for
1099                  * writing */
1100                 if (IS_APPEND(dchild->d_inode) && (acc_mode & MAY_WRITE) != 0 &&
1101                     ((rec->ur_flags & MDS_OPEN_APPEND) == 0 ||
1102                      (rec->ur_flags & MDS_OPEN_TRUNC) != 0))
1103                         GOTO(cleanup, rc = -EPERM);
1104         }
1105
1106         if (!created && (rec->ur_flags & MDS_OPEN_CREAT) &&
1107             (rec->ur_flags & MDS_OPEN_EXCL)) {
1108                 /* File already exists, we didn't just create it, and we
1109                  * were passed O_EXCL; err-or. */
1110                 GOTO(cleanup, rc = -EEXIST); // returns a lock to the client
1111         }
1112
1113         /* if we are following a symlink, don't open */
1114         if (S_ISLNK(dchild->d_inode->i_mode))
1115                 GOTO(cleanup, rc = 0);
1116
1117         if ((rec->ur_flags & MDS_OPEN_DIRECTORY) &&
1118             !S_ISDIR(dchild->d_inode->i_mode))
1119                 GOTO(cleanup, rc = -ENOTDIR);
1120
1121         if (S_ISDIR(dchild->d_inode->i_mode)) {
1122                 if (rec->ur_flags & MDS_OPEN_CREAT ||
1123                     rec->ur_flags & FMODE_WRITE) {
1124                         /*we are trying to create or write a exist dir*/
1125                         GOTO(cleanup, rc = -EISDIR);
1126                 }
1127                 if (ll_permission(dchild->d_inode, acc_mode, NULL)) {
1128                         GOTO(cleanup, rc = -EACCES);
1129                 }
1130                 if (is_mount_object(dchild)) {
1131                         CERROR("Found possible GNS mount object %*s; not "
1132                                "opening.\n", dchild->d_name.len,
1133                                dchild->d_name.name);
1134                         GOTO(cleanup, rc = 0); // success, but don't really open
1135                 }
1136         }
1137
1138         /* Step 5: mds_open it */
1139         rc = mds_finish_open(req, dchild, body, rec->ur_flags, &handle, rec,
1140                              rep);
1141         GOTO(cleanup, rc);
1142
1143  cleanup:
1144         rc = mds_finish_transno(mds, dchild ? dchild->d_inode : NULL, handle,
1145                                 req, rc, rep ? rep->lock_policy_res1 : 0);
1146
1147         switch (cleanup_phase) {
1148         case 2:
1149                 if (rc && created) {
1150                         int err = vfs_unlink(dparent->d_inode, dchild);
1151                         if (err) {
1152                                 CERROR("unlink(%*s) in error path: %d\n",
1153                                        dchild->d_name.len, dchild->d_name.name,
1154                                        err);
1155                         }
1156                 } else if (created) {
1157 #if 0
1158                         mds_lock_new_child(obd, dchild->d_inode, NULL);
1159 #endif
1160                 }
1161                 l_dput(dchild);
1162         case 1:
1163                 if (dparent == NULL)
1164                         break;
1165
1166                 l_dput(dparent);
1167 #ifdef S_PDIROPS
1168                 if (parent_lockh[1].cookie != 0)
1169                         ldlm_lock_decref(parent_lockh + 1, update_mode);
1170 #endif
1171                 if (rc)
1172                         ldlm_lock_decref(parent_lockh, parent_mode);
1173                 else
1174                         ptlrpc_save_lock (req, parent_lockh, parent_mode);
1175         }
1176         if (mea)
1177                 OBD_FREE(mea, mea_size);
1178         RETURN(rc);
1179 }
1180
1181 /* Close a "file descriptor" and possibly unlink an orphan from the
1182  * PENDING directory.  Caller must hold child->i_sem, this drops it.
1183  *
1184  * If we are being called from mds_disconnect() because the client has
1185  * disappeared, then req == NULL and we do not update last_rcvd because
1186  * there is nothing that could be recovered by the client at this stage
1187  * (it will not even _have_ an entry in last_rcvd anymore).
1188  *
1189  * Returns EAGAIN if the client needs to get more data and re-close. */
1190 int mds_mfd_close(struct ptlrpc_request *req, int offset,
1191                   struct obd_device *obd, struct mds_file_data *mfd,
1192                   int unlink_orphan)
1193 {
1194         struct inode *inode = mfd->mfd_dentry->d_inode;
1195         char fidname[LL_FID_NAMELEN];
1196         int last_orphan, fidlen, rc = 0, cleanup_phase = 0;
1197         struct dentry *pending_child = NULL;
1198         struct mds_obd *mds = &obd->u.mds;
1199         struct inode *pending_dir = mds->mds_pending_dir->d_inode;
1200         void *handle = NULL;
1201         struct mds_body *request_body = NULL, *reply_body = NULL;
1202         struct dentry_params dp;
1203         struct iattr iattr = { 0 };
1204         struct llog_create_locks *lcl = NULL;
1205         ENTRY;
1206
1207         if (req && req->rq_reqmsg != NULL)
1208                 request_body = lustre_msg_buf(req->rq_reqmsg, offset,
1209                                               sizeof(*request_body));
1210         if (req && req->rq_repmsg != NULL)
1211                 reply_body = lustre_msg_buf(req->rq_repmsg, 0,
1212                                             sizeof(*reply_body));
1213
1214         fidlen = ll_fid2str(fidname, inode->i_ino, inode->i_generation);
1215         CDEBUG(D_INODE, "inode %p ino %s nlink %d orphan %d\n", inode, fidname,
1216                inode->i_nlink, mds_orphan_open_count(inode));
1217         last_orphan = mds_orphan_open_dec_test(inode) &&
1218                       mds_inode_is_orphan(inode);
1219         UP_WRITE_I_ALLOC_SEM(inode);
1220
1221         /* this is half of the actual "close" */
1222         if (mfd->mfd_mode & FMODE_WRITE) {
1223                 rc = mds_put_write_access(mds, inode, request_body,
1224                                           last_orphan && unlink_orphan);
1225         } else if (mfd->mfd_mode & FMODE_EXEC) {
1226                 mds_allow_write_access(inode);
1227         }
1228
1229         if (last_orphan && unlink_orphan) {
1230                 struct lov_mds_md *lmm = NULL;
1231                 int stripe_count = 0;
1232                 LASSERT(rc == 0); /* mds_put_write_access must have succeeded */
1233
1234                 if (obd->obd_recovering) {
1235                         CDEBUG(D_HA, "not remove orphan %s until recovery"
1236                                " is over\n", fidname);
1237                         GOTO(out, rc);
1238                 }
1239
1240                 CDEBUG(D_HA, "destroying orphan object %s\n", fidname);
1241
1242                 if ((S_ISREG(inode->i_mode) && inode->i_nlink != 1) ||
1243                     (S_ISDIR(inode->i_mode) && inode->i_nlink != 2))
1244                         CERROR("found \"orphan\" %s %s with link count %d\n",
1245                                S_ISREG(inode->i_mode) ? "file" : "dir",
1246                                fidname, inode->i_nlink);
1247                 /* Sadly, there is no easy way to save pending_child from
1248                  * mds_reint_unlink() into mfd, so we need to re-lookup,
1249                  * but normally it will still be in the dcache. */
1250                 down(&pending_dir->i_sem);
1251                 cleanup_phase = 1;  /* up(&pending_dir->i_sem) when finished */
1252                 pending_child = lookup_one_len(fidname, mds->mds_pending_dir,
1253                                                fidlen);
1254                 if (IS_ERR(pending_child))
1255                         GOTO(cleanup, rc = PTR_ERR(pending_child));
1256                 LASSERT(pending_child->d_inode != NULL);
1257
1258                 cleanup_phase = 2; /* dput(pending_child) when finished */
1259                 if (req != NULL && req->rq_repmsg != NULL) {
1260                         lmm = lustre_msg_buf(req->rq_repmsg, 1, 0);
1261                         stripe_count = le32_to_cpu(lmm->lmm_stripe_count);
1262                 }
1263
1264                 handle = fsfilt_start_log(obd, pending_dir, FSFILT_OP_UNLINK,
1265                                           NULL, stripe_count);
1266                 if (IS_ERR(handle)) {
1267                         rc = PTR_ERR(handle);
1268                         handle = NULL;
1269                         GOTO(cleanup, rc);
1270                 }
1271
1272                 pending_child->d_fsdata = (void *) &dp;
1273                 dp.p_inum = 0;
1274                 dp.p_ptr = req;
1275                 if (S_ISDIR(pending_child->d_inode->i_mode))
1276                         rc = vfs_rmdir(pending_dir, pending_child);
1277                 else
1278                         rc = vfs_unlink(pending_dir, pending_child);
1279                 if (rc)
1280                         CERROR("error unlinking orphan %s: rc %d\n",fidname,rc);
1281
1282                 if (req != NULL && req->rq_repmsg != NULL &&
1283                     (reply_body->valid & OBD_MD_FLEASIZE) &&
1284                     mds_log_op_unlink(obd, pending_child->d_inode,
1285                                       lmm, req->rq_repmsg->buflens[1],
1286                                       lustre_msg_buf(req->rq_repmsg, 2, 0),
1287                                       req->rq_repmsg->buflens[2], &lcl) > 0) {
1288                         reply_body->valid |= OBD_MD_FLCOOKIE;
1289                 }
1290
1291                 goto out; /* Don't bother updating attrs on unlinked inode */
1292         }
1293
1294 #if 0
1295         if (request_body != NULL && mfd->mfd_mode & FMODE_WRITE && rc == 0) {
1296                 /* Update the on-disk attributes if this was the last write
1297                  * close, and all information was provided (i.e., rc == 0)
1298                  *
1299                  * XXX this should probably be abstracted with mds_reint_setattr
1300                  */
1301
1302                 if (request_body->valid & OBD_MD_FLMTIME &&
1303                     LTIME_S(request_body->mtime) > LTIME_S(inode->i_mtime)) {
1304                         LTIME_S(iattr.ia_mtime) = LTIME_S(request_body->mtime);
1305                         iattr.ia_valid |= ATTR_MTIME;
1306                 }
1307                 if (request_body->valid & OBD_MD_FLCTIME &&
1308                     LTIME_S(request_body->ctime) > LTIME_S(inode->i_ctime)) {
1309                         LTIME_S(iattr.ia_ctime) = LTIME_S(request_body->ctime);
1310                         iattr.ia_valid |= ATTR_CTIME;
1311                 }
1312
1313                 /* XXX can't set block count with fsfilt_setattr (!) */
1314                 if (request_body->valid & OBD_MD_FLSIZE) {
1315                         iattr.ia_valid |= ATTR_SIZE;
1316                         iattr.ia_size = request_body->size;
1317                 }
1318                 /* if (request_body->valid & OBD_MD_FLBLOCKS) {
1319                         iattr.ia_valid |= ATTR_BLOCKS;
1320                         iattr.ia_blocks = request_body->blocks
1321                 } */
1322
1323         }
1324 #endif
1325         if (request_body != NULL && request_body->valid & OBD_MD_FLATIME) {
1326                 /* Only start a transaction to write out only the atime if
1327                  * it is more out-of-date than the specified limit.  If we
1328                  * are already going to write out the atime then do it anyway.
1329                  * */
1330                 if ((request_body->atime >
1331                      LTIME_S(inode->i_atime) + MAX_ATIME_DIFF) ||
1332                     (iattr.ia_valid != 0 &&
1333                      request_body->atime > LTIME_S(inode->i_atime))) {
1334                         LTIME_S(iattr.ia_atime) = request_body->atime;
1335                         iattr.ia_valid |= ATTR_ATIME;
1336                 }
1337         }
1338
1339         if (iattr.ia_valid != 0) {
1340                 handle = fsfilt_start(obd, inode, FSFILT_OP_SETATTR, NULL);
1341                 if (IS_ERR(handle))
1342                         GOTO(cleanup, rc = PTR_ERR(handle));
1343                 rc = fsfilt_setattr(obd, mfd->mfd_dentry, handle, &iattr, 0);
1344                 if (rc)
1345                         CERROR("error in setattr(%s): rc %d\n", fidname, rc);
1346         }
1347 out:
1348         /* If other clients have this file open for write, rc will be > 0 */
1349         if (rc > 0)
1350                 rc = 0;
1351         l_dput(mfd->mfd_dentry);
1352         mds_mfd_destroy(mfd);
1353
1354  cleanup:
1355         if (req != NULL && reply_body != NULL) {
1356                 rc = mds_finish_transno(mds, pending_dir, handle, req, rc, 0);
1357         } else if (handle) {
1358                 int err = fsfilt_commit(obd, mds->mds_sb, pending_dir, handle, 0);
1359                 if (err) {
1360                         CERROR("error committing close: %d\n", err);
1361                         if (!rc)
1362                                 rc = err;
1363                 }
1364         }
1365
1366         switch (cleanup_phase) {
1367         case 2:
1368                 if (lcl != NULL)
1369                         ptlrpc_save_llog_lock(req, lcl);
1370                 dput(pending_child);
1371         case 1:
1372                 up(&pending_dir->i_sem);
1373         }
1374         RETURN(rc);
1375 }
1376
1377 int mds_close(struct ptlrpc_request *req, int offset)
1378 {
1379         struct mds_export_data *med = &req->rq_export->exp_mds_data;
1380         struct obd_device *obd = req->rq_export->exp_obd;
1381         struct mds_body *body;
1382         struct mds_file_data *mfd;
1383         struct lvfs_run_ctxt saved;
1384         struct inode *inode;
1385         int rc, repsize[3] = {sizeof(struct mds_body),
1386                               obd->u.mds.mds_max_mdsize,
1387                               obd->u.mds.mds_max_cookiesize};
1388         ENTRY;
1389
1390         MDS_UPDATE_COUNTER((&obd->u.mds), MDS_CLOSE_COUNT);
1391
1392         rc = lustre_pack_reply(req, 3, repsize, NULL);
1393         if (rc) {
1394                 CERROR("lustre_pack_reply: rc = %d\n", rc);
1395                 req->rq_status = rc;
1396         } else {
1397                 MDS_CHECK_RESENT(req, mds_reconstruct_generic(req));
1398         }
1399
1400         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1401                 DEBUG_REQ(D_HA, req, "close replay\n");
1402                 memcpy(lustre_msg_buf(req->rq_repmsg, 2, 0),
1403                        lustre_msg_buf(req->rq_reqmsg, offset + 1, 0),
1404                        req->rq_repmsg->buflens[2]);
1405         }
1406
1407
1408         body = lustre_swab_reqbuf(req, offset, sizeof(*body),
1409                                   lustre_swab_mds_body);
1410         if (body == NULL) {
1411                 CERROR("Can't unpack body\n");
1412                 req->rq_status = -EFAULT;
1413                 RETURN(-EFAULT);
1414         }
1415
1416         if (body->flags & MDS_BFLAG_UNCOMMITTED_WRITES)
1417                 /* do some stuff */ ;
1418
1419         mfd = mds_handle2mfd(&body->handle);
1420         if (mfd == NULL) {
1421                 DEBUG_REQ(D_ERROR, req, "no handle for file close ino "LPD64
1422                           ": cookie "LPX64, body->fid1.id, body->handle.cookie);
1423                 req->rq_status = -ESTALE;
1424                 RETURN(-ESTALE);
1425         }
1426
1427         inode = mfd->mfd_dentry->d_inode;
1428         /* child i_alloc_sem protects orphan_dec_test && is_orphan race */
1429         DOWN_WRITE_I_ALLOC_SEM(inode); /* mds_mfd_close drops this */
1430         if (mds_inode_is_orphan(inode) && mds_orphan_open_count(inode) == 1) {
1431                 body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body));
1432                 LASSERT(body != NULL);
1433
1434                 mds_pack_inode2fid(obd, &body->fid1, inode);
1435                 mds_pack_inode2body(obd, body, inode);
1436                 mds_pack_md(obd, req->rq_repmsg, 1, body, inode, MDS_PACK_MD_LOCK);
1437         }
1438         spin_lock(&med->med_open_lock);
1439         list_del(&mfd->mfd_list);
1440         spin_unlock(&med->med_open_lock);
1441
1442         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1443         req->rq_status = mds_mfd_close(req, offset, obd, mfd, 1);
1444         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1445
1446         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_CLOSE_PACK)) {
1447                 CERROR("test case OBD_FAIL_MDS_CLOSE_PACK\n");
1448                 req->rq_status = -ENOMEM;
1449                 mds_mfd_put(mfd);
1450                 RETURN(-ENOMEM);
1451         }
1452
1453         mds_mfd_put(mfd);
1454         RETURN(0);
1455 }
1456
1457 int mds_done_writing(struct ptlrpc_request *req, int offset)
1458 {
1459         struct mds_body *body;
1460         int rc, size = sizeof(struct mds_body);
1461         ENTRY;
1462
1463         MDS_CHECK_RESENT(req, mds_reconstruct_generic(req));
1464
1465         body = lustre_swab_reqbuf(req, offset, sizeof(*body),
1466                                   lustre_swab_mds_body);
1467         if (body == NULL) {
1468                 CERROR("Can't unpack body\n");
1469                 req->rq_status = -EFAULT;
1470                 RETURN(-EFAULT);
1471         }
1472
1473         rc = lustre_pack_reply(req, 1, &size, NULL);
1474         if (rc) {
1475                 CERROR("lustre_pack_reply: rc = %d\n", rc);
1476                 req->rq_status = rc;
1477         }
1478
1479         RETURN(0);
1480 }