lustre/llite/super.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Lustre Light Super operations
   5  *
   6  *  Copyright (c) 2002, 2003 Cluster File Systems, Inc.
   7  *
   8  *   This file is part of Lustre, http://www.lustre.org.
   9  *
  10  *   Lustre is free software; you can redistribute it and/or
  11  *   modify it under the terms of version 2 of the GNU General Public
  12  *   License as published by the Free Software Foundation.
  13  *
  14  *   Lustre is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *   GNU General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU General Public License
  20  *   along with Lustre; if not, write to the Free Software
  21  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #define DEBUG_SUBSYSTEM S_LLITE
  25
  26 #include <linux/module.h>
  27 #include <linux/random.h>
  28 #include <linux/version.h>
  29 #include <linux/lustre_lite.h>
  30 #include <linux/lustre_ha.h>
  31 #include <linux/lustre_dlm.h>
  32 #include <linux/init.h>
  33 #include <linux/fs.h>
  34 #include <linux/lprocfs_status.h>
  35
  36 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  37 kmem_cache_t *ll_file_data_slab;
  38 extern struct address_space_operations ll_aops;
  39 extern struct address_space_operations ll_dir_aops;
  40 struct super_operations ll_super_operations;
  41
  42 /* /proc/lustre/llite root that tracks llite mount points */
  43 struct proc_dir_entry *proc_lustre_fs_root;
  44 /* lproc_llite.c */
  45 extern int lprocfs_register_mountpoint(struct proc_dir_entry *parent,
  46                                        struct super_block *sb,
  47                                        char *osc, char *mdc);
  48
  49 extern int ll_recover(struct recovd_data *, int);
  50 extern int ll_commitcbd_setup(struct ll_sb_info *);
  51 extern int ll_commitcbd_cleanup(struct ll_sb_info *);
  52
  53 static char *ll_read_opt(const char *opt, char *data)
  54 {
  55         char *value;
  56         char *retval;
  57         ENTRY;
  58
  59         CDEBUG(D_SUPER, "option: %s, data %s\n", opt, data);
  60         if ( strncmp(opt, data, strlen(opt)) )
  61                 RETURN(NULL);
  62         if ( (value = strchr(data, '=')) == NULL )
  63                 RETURN(NULL);
  64
  65         value++;
  66         OBD_ALLOC(retval, strlen(value) + 1);
  67         if ( !retval ) {
  68                 CERROR("out of memory!\n");
  69                 RETURN(NULL);
  70         }
  71
  72         memcpy(retval, value, strlen(value)+1);
  73         CDEBUG(D_SUPER, "Assigned option: %s, value %s\n", opt, retval);
  74         RETURN(retval);
  75 }
  76
  77 static int ll_set_opt(const char *opt, char *data, int fl)
  78 {
  79         ENTRY;
  80
  81         CDEBUG(D_SUPER, "option: %s, data %s\n", opt, data);
  82         if ( strncmp(opt, data, strlen(opt)) )
  83                 RETURN(0);
  84         else
  85                 RETURN(fl);
  86 }
  87
  88 static void ll_options(char *options, char **ost, char **mds, int *flags)
  89 {
  90         char *this_char;
  91         ENTRY;
  92
  93         if (!options) {
  94                 EXIT;
  95                 return;
  96         }
  97
  98         for (this_char = strtok (options, ",");
  99              this_char != NULL;
 100              this_char = strtok (NULL, ",")) {
 101                 CDEBUG(D_SUPER, "this_char %s\n", this_char);
 102                 if ( (!*ost && (*ost = ll_read_opt("osc", this_char)))||
 103                      (!*mds && (*mds = ll_read_opt("mdc", this_char)))||
 104                      (!(*flags & LL_SBI_NOLCK) && ((*flags) = (*flags) |
 105                       ll_set_opt("nolock", this_char, LL_SBI_NOLCK))) )
 106                         continue;
 107         }
 108         EXIT;
 109 }
 110
 111 #ifndef log2
 112 #define log2(n) ffz(~(n))
 113 #endif
 114
 115 static struct super_block *ll_read_super(struct super_block *sb,
 116                                          void *data, int silent)
 117 {
 118         struct inode *root = 0;
 119         struct obd_device *obd;
 120         struct ll_sb_info *sbi;
 121         char *osc = NULL;
 122         char *mdc = NULL;
 123         int err;
 124         struct ll_fid rootfid;
 125         struct obd_statfs osfs;
 126         struct ptlrpc_request *request = NULL;
 127         struct ptlrpc_connection *mdc_conn;
 128         struct ll_read_inode2_cookie lic;
 129         class_uuid_t uuid;
 130         struct obd_uuid param_uuid;
 131
 132         ENTRY;
 133
 134         OBD_ALLOC(sbi, sizeof(*sbi));
 135         if (!sbi)
 136                 RETURN(NULL);
 137
 138         INIT_LIST_HEAD(&sbi->ll_conn_chain);
 139         INIT_LIST_HEAD(&sbi->ll_orphan_dentry_list);
 140         generate_random_uuid(uuid);
 141         class_uuid_unparse(uuid, &sbi->ll_sb_uuid);
 142
 143         sb->u.generic_sbp = sbi;
 144
 145         ll_options(data, &osc, &mdc, &sbi->ll_flags);
 146
 147         if (!osc) {
 148                 CERROR("no osc\n");
 149                 GOTO(out_free, sb = NULL);
 150         }
 151
 152         if (!mdc) {
 153                 CERROR("no mdc\n");
 154                 GOTO(out_free, sb = NULL);
 155         }
 156
 157         strncpy(param_uuid.uuid, mdc, sizeof(param_uuid.uuid));
 158         obd = class_uuid2obd(&param_uuid);
 159         if (!obd) {
 160                 CERROR("MDC %s: not setup or attached\n", mdc);
 161                 GOTO(out_free, sb = NULL);
 162         }
 163
 164         err = obd_connect(&sbi->ll_mdc_conn, obd, &sbi->ll_sb_uuid,
 165                           ptlrpc_recovd, ll_recover);
 166         if (err) {
 167                 CERROR("cannot connect to %s: rc = %d\n", mdc, err);
 168                 GOTO(out_free, sb = NULL);
 169         }
 170
 171         mdc_conn = sbi2mdc(sbi)->cl_import.imp_connection;
 172         list_add(&mdc_conn->c_sb_chain, &sbi->ll_conn_chain);
 173
 174         strncpy(param_uuid.uuid, osc, sizeof(param_uuid.uuid));
 175         obd = class_uuid2obd(&param_uuid);
 176         if (!obd) {
 177                 CERROR("OSC %s: not setup or attached\n", osc);
 178                 GOTO(out_mdc, sb = NULL);
 179         }
 180
 181         err = obd_connect(&sbi->ll_osc_conn, obd, &sbi->ll_sb_uuid,
 182                           ptlrpc_recovd, ll_recover);
 183         if (err) {
 184                 CERROR("cannot connect to %s: rc = %d\n", osc, err);
 185                 GOTO(out_mdc, sb = NULL);
 186         }
 187
 188         err = mdc_getstatus(&sbi->ll_mdc_conn, &rootfid);
 189         if (err) {
 190                 CERROR("cannot mds_connect: rc = %d\n", err);
 191                 GOTO(out_mdc, sb = NULL);
 192         }
 193         CDEBUG(D_SUPER, "rootfid "LPU64"\n", rootfid.id);
 194         sbi->ll_rootino = rootfid.id;
 195
 196         memset(&osfs, 0, sizeof(osfs));
 197         err = obd_statfs(&sbi->ll_mdc_conn, &osfs);
 198         sb->s_blocksize = osfs.os_bsize;
 199         sb->s_blocksize_bits = log2(osfs.os_bsize);
 200         sb->s_magic = LL_SUPER_MAGIC;
 201         sb->s_maxbytes = (1ULL << (32 + 9)) - osfs.os_bsize;
 202
 203         sb->s_op = &ll_super_operations;
 204
 205         /* make root inode */
 206         err = mdc_getattr(&sbi->ll_mdc_conn, sbi->ll_rootino, S_IFDIR,
 207                           OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, 0, &request);
 208         if (err) {
 209                 CERROR("mdc_getattr failed for root: rc = %d\n", err);
 210                 GOTO(out_request, sb = NULL);
 211         }
 212
 213         /* initialize committed transaction callback daemon */
 214         spin_lock_init(&sbi->ll_commitcbd_lock);
 215         init_waitqueue_head(&sbi->ll_commitcbd_waitq);
 216         init_waitqueue_head(&sbi->ll_commitcbd_ctl_waitq);
 217         sbi->ll_commitcbd_flags = 0;
 218         err = ll_commitcbd_setup(sbi);
 219         if (err) {
 220                 CERROR("failed to start commit callback daemon: rc = %d\n",err);
 221                 GOTO(out_request, sb = NULL);
 222         }
 223
 224         lic.lic_body = lustre_msg_buf(request->rq_repmsg, 0);
 225         lic.lic_lmm = NULL;
 226         LASSERT(sbi->ll_rootino != 0);
 227         root = iget4(sb, sbi->ll_rootino, NULL, &lic);
 228
 229         if (root) {
 230                 sb->s_root = d_alloc_root(root);
 231         } else {
 232                 CERROR("lustre_lite: bad iget4 for root\n");
 233                 GOTO(out_cdb, sb = NULL);
 234         }
 235
 236         ptlrpc_req_finished(request);
 237         request = NULL;
 238
 239         if (proc_lustre_fs_root) {
 240                 err = lprocfs_register_mountpoint(proc_lustre_fs_root, sb,
 241                                                   osc, mdc);
 242                 if (err < 0)
 243                         CERROR("could not register mount in /proc/lustre");
 244         }
 245
 246 out_dev:
 247         if (mdc)
 248                 OBD_FREE(mdc, strlen(mdc) + 1);
 249         if (osc)
 250                 OBD_FREE(osc, strlen(osc) + 1);
 251
 252         RETURN(sb);
 253
 254 out_cdb:
 255         ll_commitcbd_cleanup(sbi);
 256 out_request:
 257         ptlrpc_req_finished(request);
 258         obd_disconnect(&sbi->ll_osc_conn);
 259 out_mdc:
 260         obd_disconnect(&sbi->ll_mdc_conn);
 261 out_free:
 262         OBD_FREE(sbi, sizeof(*sbi));
 263
 264         goto out_dev;
 265 } /* ll_read_super */
 266
 267 static void ll_put_super(struct super_block *sb)
 268 {
 269         struct ll_sb_info *sbi = ll_s2sbi(sb);
 270         struct list_head *tmp, *next;
 271         struct ll_fid rootfid;
 272         ENTRY;
 273
 274         list_del(&sbi->ll_conn_chain);
 275         ll_commitcbd_cleanup(sbi);
 276         obd_disconnect(&sbi->ll_osc_conn);
 277
 278         /* NULL request to force sync on the MDS, and get the last_committed
 279          * value to flush remaining RPCs from the sending queue on client.
 280          *
 281          * XXX This should be an mdc_sync() call to sync the whole MDS fs,
 282          *     which we can call for other reasons as well.
 283          */
 284         mdc_getstatus(&sbi->ll_mdc_conn, &rootfid);
 285
 286         if (sbi->ll_proc_root) {
 287                 lprocfs_remove(sbi->ll_proc_root);
 288                 sbi->ll_proc_root = NULL;
 289         }
 290
 291         obd_disconnect(&sbi->ll_mdc_conn);
 292
 293         spin_lock(&dcache_lock);
 294         list_for_each_safe(tmp, next, &sbi->ll_orphan_dentry_list) {
 295                 struct dentry *dentry = list_entry(tmp, struct dentry, d_hash);
 296                 shrink_dcache_parent(dentry);
 297         }
 298         spin_unlock(&dcache_lock);
 299
 300         OBD_FREE(sbi, sizeof(*sbi));
 301
 302         EXIT;
 303 } /* ll_put_super */
 304
 305 static void ll_clear_inode(struct inode *inode)
 306 {
 307         struct ll_sb_info *sbi = ll_i2sbi(inode);
 308         struct ll_inode_info *lli = ll_i2info(inode);
 309         int rc;
 310         ENTRY;
 311
 312         rc = mdc_cancel_unused(&sbi->ll_mdc_conn, inode, LDLM_FL_NO_CALLBACK);
 313         if (rc < 0) {
 314                 CERROR("mdc_cancel_unused: %d\n", rc);
 315                 /* XXX FIXME do something dramatic */
 316         }
 317
 318         if (lli->lli_smd) {
 319                 rc = obd_cancel_unused(&sbi->ll_osc_conn, lli->lli_smd, 0);
 320                 if (rc < 0) {
 321                         CERROR("obd_cancel_unused: %d\n", rc);
 322                         /* XXX FIXME do something dramatic */
 323                 }
 324         }
 325
 326         if (atomic_read(&inode->i_count) != 0)
 327                 CERROR("clearing in-use inode %lu: count = %d\n",
 328                        inode->i_ino, atomic_read(&inode->i_count));
 329
 330         if (lli->lli_smd)
 331                 obd_free_memmd(&sbi->ll_osc_conn, &lli->lli_smd);
 332
 333         if (lli->lli_symlink_name) {
 334                 OBD_FREE(lli->lli_symlink_name,
 335                          strlen(lli->lli_symlink_name) + 1);
 336                 lli->lli_symlink_name = NULL;
 337         }
 338
 339         EXIT;
 340 }
 341
 342 #if 0
 343 static void ll_delete_inode(struct inode *inode)
 344 {
 345         ENTRY;
 346         if (S_ISREG(inode->i_mode)) {
 347                 int err;
 348                 struct obdo *oa;
 349                 struct lov_stripe_md *lsm = ll_i2info(inode)->lli_smd;
 350
 351                 /* mcreate with no open */
 352                 if (!lsm)
 353                         GOTO(out, 0);
 354
 355                 if (lsm->lsm_object_id == 0) {
 356                         CERROR("This really happens\n");
 357                         /* No obdo was ever created */
 358                         GOTO(out, 0);
 359                 }
 360
 361                 oa = obdo_alloc();
 362                 if (oa == NULL)
 363                         GOTO(out, -ENOMEM);
 364
 365                 oa->o_id = lsm->lsm_object_id;
 366                 obdo_from_inode(oa, inode, OBD_MD_FLID | OBD_MD_FLTYPE);
 367
 368                 err = obd_destroy(ll_i2obdconn(inode), oa, lsm, NULL);
 369                 obdo_free(oa);
 370                 if (err)
 371                         CDEBUG(D_INODE,
 372                                "inode %lu obd_destroy objid "LPX64" error %d\n",
 373                                inode->i_ino, lsm->lsm_object_id, err);
 374         }
 375 out:
 376         clear_inode(inode);
 377         EXIT;
 378 }
 379 #endif
 380
 381 /* like inode_setattr, but doesn't mark the inode dirty */
 382 static int ll_attr2inode(struct inode *inode, struct iattr *attr, int trunc)
 383 {
 384         unsigned int ia_valid = attr->ia_valid;
 385         int error = 0;
 386
 387         if ((ia_valid & ATTR_SIZE) && trunc) {
 388                 error = vmtruncate(inode, attr->ia_size);
 389                 if (error)
 390                         goto out;
 391         } else if (ia_valid & ATTR_SIZE)
 392                 inode->i_size = attr->ia_size;
 393
 394         if (ia_valid & ATTR_UID)
 395                 inode->i_uid = attr->ia_uid;
 396         if (ia_valid & ATTR_GID)
 397                 inode->i_gid = attr->ia_gid;
 398         if (ia_valid & ATTR_ATIME)
 399                 inode->i_atime = attr->ia_atime;
 400         if (ia_valid & ATTR_MTIME)
 401                 inode->i_mtime = attr->ia_mtime;
 402         if (ia_valid & ATTR_CTIME)
 403                 inode->i_ctime = attr->ia_ctime;
 404         if (ia_valid & ATTR_MODE) {
 405                 inode->i_mode = attr->ia_mode;
 406                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 407                         inode->i_mode &= ~S_ISGID;
 408         }
 409 out:
 410         return error;
 411 }
 412
 413 int ll_inode_setattr(struct inode *inode, struct iattr *attr, int do_trunc)
 414 {
 415         struct ptlrpc_request *request = NULL;
 416         struct ll_sb_info *sbi = ll_i2sbi(inode);
 417         int err = 0;
 418         ENTRY;
 419
 420         /* change incore inode */
 421         ll_attr2inode(inode, attr, do_trunc);
 422
 423         /* Don't send size changes to MDS to avoid "fast EA" problems, and
 424          * also avoid a pointless RPC (we get file size from OST anyways).
 425          */
 426         attr->ia_valid &= ~ATTR_SIZE;
 427         if (attr->ia_valid) {
 428                 err = mdc_setattr(&sbi->ll_mdc_conn, inode, attr, NULL, 0,
 429                                   &request);
 430                 if (err)
 431                         CERROR("mdc_setattr fails: err = %d\n", err);
 432
 433                 ptlrpc_req_finished(request);
 434                 if (S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_MTIME_SET) {
 435                         struct lov_stripe_md *lsm = ll_i2info(inode)->lli_smd;
 436                         struct obdo oa;
 437                         int err2;
 438
 439                         CDEBUG(D_INODE, "set mtime on OST inode %lu to %lu\n",
 440                                inode->i_ino, attr->ia_mtime);
 441                         oa.o_id = lsm->lsm_object_id;
 442                         oa.o_mode = S_IFREG;
 443                         oa.o_valid = OBD_MD_FLID |OBD_MD_FLTYPE |OBD_MD_FLMTIME;
 444                         oa.o_mtime = attr->ia_mtime;
 445                         err2 = obd_setattr(&sbi->ll_osc_conn, &oa, lsm, NULL);
 446                         if (err2) {
 447                                 CERROR("obd_setattr fails: rc=%d\n", err);
 448                                 if (!err)
 449                                         err = err2;
 450                         }
 451                 }
 452         }
 453
 454         RETURN(err);
 455 }
 456
 457 int ll_setattr(struct dentry *de, struct iattr *attr)
 458 {
 459         int rc = inode_change_ok(de->d_inode, attr);
 460
 461         if (rc)
 462                 return rc;
 463
 464         return ll_inode_setattr(de->d_inode, attr, 1);
 465 }
 466
 467 static int ll_statfs(struct super_block *sb, struct statfs *sfs)
 468 {
 469         struct ll_sb_info *sbi = ll_s2sbi(sb);
 470         struct obd_statfs osfs;
 471         int rc;
 472         ENTRY;
 473
 474         memset(sfs, 0, sizeof(*sfs));
 475         rc = obd_statfs(&sbi->ll_mdc_conn, &osfs);
 476         statfs_unpack(sfs, &osfs);
 477         if (rc)
 478                 CERROR("mdc_statfs fails: rc = %d\n", rc);
 479         else
 480                 CDEBUG(D_SUPER, "mdc_statfs shows blocks "LPU64"/"LPU64
 481                        " objects "LPU64"/"LPU64"\n",
 482                        osfs.os_bavail, osfs.os_blocks,
 483                        osfs.os_ffree, osfs.os_files);
 484
 485         /* temporary until mds_statfs returns statfs info for all OSTs */
 486         if (!rc) {
 487                 rc = obd_statfs(&sbi->ll_osc_conn, &osfs);
 488                 if (rc) {
 489                         CERROR("obd_statfs fails: rc = %d\n", rc);
 490                         GOTO(out, rc);
 491                 }
 492                 CDEBUG(D_SUPER, "obd_statfs shows blocks "LPU64"/"LPU64
 493                        " objects "LPU64"/"LPU64"\n",
 494                        osfs.os_bavail, osfs.os_blocks,
 495                        osfs.os_ffree, osfs.os_files);
 496
 497                 while (osfs.os_blocks > ~0UL) {
 498                         sfs->f_bsize <<= 1;
 499
 500                         osfs.os_blocks >>= 1;
 501                         osfs.os_bfree >>= 1;
 502                         osfs.os_bavail >>= 1;
 503                 }
 504                 sfs->f_blocks = osfs.os_blocks;
 505                 sfs->f_bfree = osfs.os_bfree;
 506                 sfs->f_bavail = osfs.os_bavail;
 507                 if (osfs.os_ffree < (__u64)sfs->f_ffree)
 508                         sfs->f_ffree = osfs.os_ffree;
 509         }
 510
 511 out:
 512         RETURN(rc);
 513 }
 514
 515 void ll_update_inode(struct inode *inode, struct mds_body *body,
 516                      struct lov_mds_md *lmm)
 517 {
 518         struct ll_inode_info *lli = ll_i2info(inode);
 519
 520         if (lmm != NULL)
 521                 obd_unpackmd(ll_i2obdconn(inode), &lli->lli_smd, lmm);
 522
 523         if (body->valid & OBD_MD_FLID)
 524                 inode->i_ino = body->ino;
 525         if (body->valid & OBD_MD_FLATIME)
 526                 inode->i_atime = body->atime;
 527         if (body->valid & OBD_MD_FLMTIME)
 528                 inode->i_mtime = body->mtime;
 529         if (body->valid & OBD_MD_FLCTIME)
 530                 inode->i_ctime = body->ctime;
 531         if (body->valid & OBD_MD_FLMODE)
 532                 inode->i_mode = (inode->i_mode & S_IFMT)|(body->mode & ~S_IFMT);
 533         if (body->valid & OBD_MD_FLTYPE)
 534                 inode->i_mode = (inode->i_mode & ~S_IFMT)|(body->mode & S_IFMT);
 535         if (body->valid & OBD_MD_FLUID)
 536                 inode->i_uid = body->uid;
 537         if (body->valid & OBD_MD_FLGID)
 538                 inode->i_gid = body->gid;
 539         if (body->valid & OBD_MD_FLFLAGS)
 540                 inode->i_flags = body->flags;
 541         if (body->valid & OBD_MD_FLNLINK)
 542                 inode->i_nlink = body->nlink;
 543         if (body->valid & OBD_MD_FLGENER)
 544                 inode->i_generation = body->generation;
 545         if (body->valid & OBD_MD_FLRDEV)
 546                 inode->i_rdev = body->rdev;
 547         if (body->valid & OBD_MD_FLSIZE)
 548                 inode->i_size = body->size;
 549         if (body->valid & OBD_MD_FLBLOCKS)
 550                 inode->i_blocks = body->blocks;
 551 }
 552
 553 static void ll_read_inode2(struct inode *inode, void *opaque)
 554 {
 555         struct ll_read_inode2_cookie *lic = opaque;
 556         struct mds_body *body = lic->lic_body;
 557         struct ll_inode_info *lli = ll_i2info(inode);
 558         ENTRY;
 559
 560         sema_init(&lli->lli_open_sem, 1);
 561         atomic_set(&lli->lli_open_count, 0);
 562
 563         LASSERT(!lli->lli_smd);
 564
 565         /* core attributes first */
 566         ll_update_inode(inode, body, lic ? lic->lic_lmm : NULL);
 567
 568         /* Get the authoritative file size */
 569         if (lli->lli_smd && (inode->i_mode & S_IFREG)) {
 570                 int rc;
 571                 LASSERT(lli->lli_smd->lsm_object_id != 0);
 572                 rc = ll_file_size(inode, lli->lli_smd, NULL);
 573                 if (rc) {
 574                         CERROR("ll_file_size: %d\n", rc);
 575                         ll_clear_inode(inode);
 576                         make_bad_inode(inode);
 577                 }
 578         }
 579
 580         /* OIDEBUG(inode); */
 581
 582         if (S_ISREG(inode->i_mode)) {
 583                 inode->i_op = &ll_file_inode_operations;
 584                 inode->i_fop = &ll_file_operations;
 585                 inode->i_mapping->a_ops = &ll_aops;
 586                 EXIT;
 587         } else if (S_ISDIR(inode->i_mode)) {
 588                 inode->i_op = &ll_dir_inode_operations;
 589                 inode->i_fop = &ll_dir_operations;
 590                 inode->i_mapping->a_ops = &ll_dir_aops;
 591                 EXIT;
 592         } else if (S_ISLNK(inode->i_mode)) {
 593                 inode->i_op = &ll_fast_symlink_inode_operations;
 594                 EXIT;
 595         } else {
 596                 inode->i_op = &ll_special_inode_operations;
 597                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 598                 EXIT;
 599         }
 600 }
 601
 602 static inline void invalidate_request_list(struct list_head *req_list)
 603 {
 604         struct list_head *tmp, *n;
 605         list_for_each_safe(tmp, n, req_list) {
 606                 struct ptlrpc_request *req =
 607                         list_entry(tmp, struct ptlrpc_request, rq_list);
 608                 CERROR("invalidating req xid "LPU64" op %d to %s:%d\n",
 609                        req->rq_xid, req->rq_reqmsg->opc,
 610                        req->rq_connection->c_remote_uuid.uuid,
 611                        req->rq_import->imp_client->cli_request_portal);
 612                 req->rq_flags |= PTL_RPC_FL_ERR;
 613                 wake_up(&req->rq_wait_for_rep);
 614         }
 615 }
 616
 617 void ll_umount_begin(struct super_block *sb)
 618 {
 619         struct ll_sb_info *sbi = ll_s2sbi(sb);
 620         struct list_head *ctmp;
 621
 622         ENTRY;
 623
 624         list_for_each(ctmp, &sbi->ll_conn_chain) {
 625                 struct ptlrpc_connection *conn;
 626                 conn = list_entry(ctmp, struct ptlrpc_connection, c_sb_chain);
 627
 628                 spin_lock(&conn->c_lock);
 629                 /* XXX should just be dealing with imports, probably through
 630                  * XXX iocontrol, need next-gen recovery! */
 631                 conn->c_flags |= CONN_INVALID;
 632                 /* invalidate_request_list(&conn->c_sending_head); */
 633                 invalidate_request_list(&conn->c_delayed_head);
 634                 spin_unlock(&conn->c_lock);
 635         }
 636
 637         EXIT;
 638 }
 639
 640 /* exported operations */
 641 struct super_operations ll_super_operations =
 642 {
 643         read_inode2: ll_read_inode2,
 644         clear_inode: ll_clear_inode,
 645         //        delete_inode: ll_delete_inode,
 646         put_super: ll_put_super,
 647         statfs: ll_statfs,
 648         umount_begin: ll_umount_begin
 649 };
 650
 651 static struct file_system_type lustre_lite_fs_type = {
 652         name:           "lustre_lite",
 653         fs_flags:       0,
 654         read_super:     ll_read_super,
 655         owner:          THIS_MODULE,
 656 };
 657
 658 static int __init init_lustre_lite(void)
 659 {
 660         printk(KERN_INFO "Lustre Lite Client File System; "
 661                "info@clusterfs.com\n");
 662         ll_file_data_slab = kmem_cache_create("ll_file_data",
 663                                               sizeof(struct ll_file_data), 0,
 664                                               SLAB_HWCACHE_ALIGN, NULL, NULL);
 665         if (ll_file_data_slab == NULL)
 666                 return -ENOMEM;
 667
 668         proc_lustre_fs_root = proc_lustre_root ? proc_mkdir("llite", proc_lustre_root) : NULL;
 669
 670         return register_filesystem(&lustre_lite_fs_type);
 671 }
 672
 673 static void __exit exit_lustre_lite(void)
 674 {
 675         unregister_filesystem(&lustre_lite_fs_type);
 676         kmem_cache_destroy(ll_file_data_slab);
 677
 678         if (proc_lustre_fs_root) {
 679                 lprocfs_remove(proc_lustre_fs_root);
 680                 proc_lustre_fs_root = NULL;
 681         }
 682 }
 683
 684 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 685 MODULE_DESCRIPTION("Lustre Lite Client File System");
 686 MODULE_LICENSE("GPL");
 687
 688 module_init(init_lustre_lite);
 689 module_exit(exit_lustre_lite);
 690 #endif