lustre/llite/super25.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_init_inodecache(void);
  50 extern void ll_destroy_inodecache(void);
  51 extern int ll_recover(struct recovd_data *, int);
  52 extern int ll_commitcbd_setup(struct ll_sb_info *);
  53 extern int ll_commitcbd_cleanup(struct ll_sb_info *);
  54 int ll_read_inode2(struct inode *inode, void *opaque);
  55
  56 extern int ll_proc_namespace(struct super_block* sb, char* osc, char* mdc)
  57
  58 static char *ll_read_opt(const char *opt, char *data)
  59 {
  60         char *value;
  61         char *retval;
  62         ENTRY;
  63
  64         CDEBUG(D_SUPER, "option: %s, data %s\n", opt, data);
  65         if ( strncmp(opt, data, strlen(opt)) )
  66                 RETURN(NULL);
  67         if ( (value = strchr(data, '=')) == NULL )
  68                 RETURN(NULL);
  69
  70         value++;
  71         OBD_ALLOC(retval, strlen(value) + 1);
  72         if ( !retval ) {
  73                 CERROR("out of memory!\n");
  74                 RETURN(NULL);
  75         }
  76
  77         memcpy(retval, value, strlen(value)+1);
  78         CDEBUG(D_SUPER, "Assigned option: %s, value %s\n", opt, retval);
  79         RETURN(retval);
  80 }
  81
  82 static int ll_set_opt(const char *opt, char *data, int fl)
  83 {
  84         ENTRY;
  85
  86         CDEBUG(D_SUPER, "option: %s, data %s\n", opt, data);
  87         if ( strncmp(opt, data, strlen(opt)) )
  88                 RETURN(0);
  89         else
  90                 RETURN(fl);
  91 }
  92
  93 static void ll_options(char *options, char **ost, char **mds, int *flags)
  94 {
  95         char *opt_ptr = options;
  96         char *this_char;
  97         ENTRY;
  98
  99         if (!options) {
 100                 EXIT;
 101                 return;
 102         }
 103
 104         while ((this_char = strsep (&opt_ptr, ",")) != NULL) {
 105                 CDEBUG(D_SUPER, "this_char %s\n", this_char);
 106                 if ( (!*ost && (*ost = ll_read_opt("osc", this_char)))||
 107                      (!*mds && (*mds = ll_read_opt("mdc", this_char)))||
 108                      (!(*flags & LL_SBI_NOLCK) && ((*flags) = (*flags) |
 109                       ll_set_opt("nolock", this_char, LL_SBI_NOLCK))) )
 110                         continue;
 111         }
 112         EXIT;
 113 }
 114
 115 #ifndef log2
 116 #define log2(n) ffz(~(n))
 117 #endif
 118
 119
 120 static int ll_fill_super(struct super_block *sb, void *data, int silent)
 121 {
 122         struct inode *root = 0;
 123         struct obd_device *obd;
 124         struct ll_sb_info *sbi;
 125         char *osc = NULL;
 126         char *mdc = NULL;
 127         int err;
 128         struct ll_fid rootfid;
 129         struct obd_statfs osfs;
 130         struct ptlrpc_request *request = NULL;
 131         struct ptlrpc_connection *mdc_conn;
 132         struct ll_read_inode2_cookie lic;
 133         class_uuid_t uuid;
 134
 135         ENTRY;
 136
 137         OBD_ALLOC(sbi, sizeof(*sbi));
 138         if (!sbi)
 139                 RETURN(-ENOMEM);
 140
 141         INIT_LIST_HEAD(&sbi->ll_conn_chain);
 142         generate_random_uuid(uuid);
 143         class_uuid_unparse(uuid, sbi->ll_sb_uuid);
 144
 145         sb->s_fs_info = sbi;
 146
 147         ll_options(data, &osc, &mdc, &sbi->ll_flags);
 148
 149         if (!osc) {
 150                 CERROR("no osc\n");
 151                 GOTO(out_free, sb = NULL);
 152         }
 153
 154         if (!mdc) {
 155                 CERROR("no mdc\n");
 156                 GOTO(out_free, sb = NULL);
 157         }
 158
 159         obd = class_uuid2obd(mdc);
 160         if (!obd) {
 161                 CERROR("MDC %s: not setup or attached\n", mdc);
 162                 GOTO(out_free, sb = NULL);
 163         }
 164
 165         err = obd_connect(&sbi->ll_mdc_conn, obd, sbi->ll_sb_uuid,
 166                           ptlrpc_recovd, ll_recover);
 167         if (err) {
 168                 CERROR("cannot connect to %s: rc = %d\n", mdc, err);
 169                 GOTO(out_free, sb = NULL);
 170         }
 171
 172         mdc_conn = sbi2mdc(sbi)->cl_import.imp_connection;
 173         list_add(&mdc_conn->c_sb_chain, &sbi->ll_conn_chain);
 174
 175         obd = class_uuid2obd(osc);
 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 = mdc_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         root = iget5_locked(sb, sbi->ll_rootino, NULL,
 227                             ll_read_inode2, &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(0);
 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_fill_super */
 266
 267 struct super_block * ll_get_sb(struct file_system_type *fs_type,
 268                                int flags, char *devname, void * data)
 269 {
 270         return get_sb_nodev(fs_type, flags, data, ll_fill_super);
 271 }
 272
 273 static void ll_put_super(struct super_block *sb)
 274 {
 275         struct ll_sb_info *sbi = ll_s2sbi(sb);
 276         struct ll_fid rootfid;
 277         ENTRY;
 278
 279         list_del(&sbi->ll_conn_chain);
 280         ll_commitcbd_cleanup(sbi);
 281         obd_disconnect(&sbi->ll_osc_conn);
 282
 283         /* NULL request to force sync on the MDS, and get the last_committed
 284          * value to flush remaining RPCs from the pending queue on client.
 285          *
 286          * XXX This should be an mdc_sync() call to sync the whole MDS fs,
 287          *     which we can call for other reasons as well.
 288          */
 289         mdc_getstatus(&sbi->ll_mdc_conn, &rootfid);
 290
 291         if (sbi->ll_proc_root) {
 292                 lprocfs_remove(sbi->ll_proc_root);
 293         sbi->ll_proc_root = NULL;
 294         }
 295
 296         obd_disconnect(&sbi->ll_mdc_conn);
 297         OBD_FREE(sbi, sizeof(*sbi));
 298
 299         EXIT;
 300 } /* ll_put_super */
 301
 302 static void ll_clear_inode(struct inode *inode)
 303 {
 304         struct ll_sb_info *sbi = ll_i2sbi(inode);
 305         struct ll_inode_info *lli = ll_i2info(inode);
 306         int rc;
 307         ENTRY;
 308
 309 #warning "Is there a reason we don't do this in 2.5, but we do in 2.4?"
 310 #if 0
 311         rc = mdc_cancel_unused(&sbi->ll_mdc_conn, inode, LDLM_FL_NO_CALLBACK);
 312         if (rc < 0) {
 313                 CERROR("mdc_cancel_unused: %d\n", rc);
 314                 /* XXX FIXME do something dramatic */
 315         }
 316
 317         if (lli->lli_smd) {
 318                 rc = obd_cancel_unused(&sbi->ll_osc_conn, lli->lli_smd, 0);
 319                 if (rc < 0) {
 320                         CERROR("obd_cancel_unused: %d\n", rc);
 321                         /* XXX FIXME do something dramatic */
 322                 }
 323         }
 324 #endif
 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,strlen(lli->lli_symlink_name)+1);
 335                 lli->lli_symlink_name = NULL;
 336         }
 337
 338         EXIT;
 339 }
 340
 341 static void ll_delete_inode(struct inode *inode)
 342 {
 343         ENTRY;
 344         if (S_ISREG(inode->i_mode)) {
 345                 int err;
 346                 struct obdo *oa;
 347                 struct lov_stripe_md *lsm = ll_i2info(inode)->lli_smd;
 348
 349                 /* mcreate with no open */
 350                 if (!lsm)
 351                         GOTO(out, 0);
 352
 353                 if (lsm->lsm_object_id == 0) {
 354                         CERROR("This really happens\n");
 355                         /* No obdo was ever created */
 356                         GOTO(out, 0);
 357                 }
 358
 359                 oa = obdo_alloc();
 360                 if (oa == NULL)
 361                         GOTO(out, -ENOMEM);
 362
 363                 oa->o_id = lsm->lsm_object_id;
 364                 oa->o_mode = inode->i_mode;
 365                 oa->o_valid = OBD_MD_FLID | OBD_MD_FLTYPE;
 366
 367                 err = obd_destroy(ll_i2obdconn(inode), oa, lsm);
 368                 obdo_free(oa);
 369                 if (err)
 370                         CDEBUG(D_SUPER, "obd destroy objid "LPX64" error %d\n",
 371                                lsm->lsm_object_id, err);
 372         }
 373 out:
 374         clear_inode(inode);
 375         EXIT;
 376 }
 377
 378 /* like inode_setattr, but doesn't mark the inode dirty */
 379 static int ll_attr2inode(struct inode * inode, struct iattr * attr, int trunc)
 380 {
 381         unsigned int ia_valid = attr->ia_valid;
 382         int error = 0;
 383
 384         if ((ia_valid & ATTR_SIZE) && trunc) {
 385                 error = vmtruncate(inode, attr->ia_size);
 386                 if (error)
 387                         goto out;
 388         } else if (ia_valid & ATTR_SIZE)
 389                 inode->i_size = attr->ia_size;
 390
 391         if (ia_valid & ATTR_UID)
 392                 inode->i_uid = attr->ia_uid;
 393         if (ia_valid & ATTR_GID)
 394                 inode->i_gid = attr->ia_gid;
 395         if (ia_valid & ATTR_ATIME)
 396                 inode->i_atime = attr->ia_atime;
 397         if (ia_valid & ATTR_MTIME)
 398                 inode->i_mtime = attr->ia_mtime;
 399         if (ia_valid & ATTR_CTIME)
 400                 inode->i_ctime = attr->ia_ctime;
 401         if (ia_valid & ATTR_MODE) {
 402                 inode->i_mode = attr->ia_mode;
 403                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 404                         inode->i_mode &= ~S_ISGID;
 405         }
 406 out:
 407         return error;
 408 }
 409
 410 int ll_inode_setattr(struct inode *inode, struct iattr *attr, int do_trunc)
 411 {
 412         struct ptlrpc_request *request = NULL;
 413         struct ll_sb_info *sbi = ll_i2sbi(inode);
 414         int err = 0;
 415
 416         ENTRY;
 417
 418         /* change incore inode */
 419         ll_attr2inode(inode, attr, do_trunc);
 420
 421         /* Don't send size changes to MDS to avoid "fast EA" problems, and
 422          * also avoid a pointless RPC (we get file size from OST anyways).
 423          */
 424         attr->ia_valid &= ~ATTR_SIZE;
 425         if (attr->ia_valid) {
 426                 err = mdc_setattr(&sbi->ll_mdc_conn, inode, attr, &request);
 427                 if (err)
 428                         CERROR("mdc_setattr fails: err = %d\n", err);
 429
 430                 ptlrpc_req_finished(request);
 431                 if (S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_MTIME_SET) {
 432                         struct lov_stripe_md *lsm = ll_i2info(inode)->lli_smd;
 433                         struct obdo oa;
 434                         int err;
 435
 436                         CDEBUG(D_ERROR, "setting mtime on OST\n");
 437                         oa.o_id = lsm->lsm_object_id;
 438                         oa.o_mode = S_IFREG;
 439                         oa.o_valid = OBD_MD_FLID |OBD_MD_FLTYPE |OBD_MD_FLMTIME;
 440                         oa.o_mtime = attr->ia_mtime;
 441                         err = obd_setattr(&sbi->ll_osc_conn, &oa, lsm);
 442                         if (err) {
 443                                 CERROR("obd_setattr fails: rc=%d\n", err);
 444                                 if (!rc)
 445                                         rc = err;
 446                         }
 447                 }
 448         }
 449
 450         RETURN(err);
 451 }
 452
 453 int ll_setattr(struct dentry *de, struct iattr *attr)
 454 {
 455         int rc = inode_change_ok(de->d_inode, attr);
 456
 457         if (rc)
 458                 return rc;
 459
 460         return ll_inode_setattr(de->d_inode, attr, 1);
 461 }
 462
 463 static int ll_statfs(struct super_block *sb, struct statfs *sfs)
 464 {
 465         struct ll_sb_info *sbi = ll_s2sbi(sb);
 466         struct obd_statfs osfs;
 467         int rc;
 468         ENTRY;
 469
 470         memset(sfs, 0, sizeof(*sfs));
 471         rc = obd_statfs(&sbi->ll_mdc_conn, &osfs);
 472         statfs_unpack(sfs, &osfs);
 473         if (rc)
 474                 CERROR("mdc_statfs fails: rc = %d\n", rc);
 475         else
 476                 CDEBUG(D_SUPER, "mdc_statfs shows blocks "LPU64"/"LPU64
 477                        " objects "LPU64"/"LPU64"\n",
 478                        osfs.os_bavail, osfs.os_blocks,
 479                        osfs.os_ffree, osfs.os_files);
 480
 481         /* temporary until mds_statfs returns statfs info for all OSTs */
 482         if (!rc) {
 483                 rc = obd_statfs(&sbi->ll_osc_conn, &osfs);
 484                 if (rc) {
 485                         CERROR("obd_statfs fails: rc = %d\n", rc);
 486                         GOTO(out, rc);
 487                 }
 488                 CDEBUG(D_SUPER, "obd_statfs shows blocks "LPU64"/"LPU64
 489                        " objects "LPU64"/"LPU64"\n",
 490                        osfs.os_bavail, osfs.os_blocks,
 491                        osfs.os_ffree, osfs.os_files);
 492
 493                 while (osfs.os_blocks > ~0UL) {
 494                         sfs->f_bsize <<= 1;
 495
 496                         osfs.os_blocks >>= 1;
 497                         osfs.os_bfree >>= 1;
 498                         osfs.os_bavail >>= 1;
 499                 }
 500                 sfs->f_blocks = osfs.os_blocks;
 501                 sfs->f_bfree = osfs.os_bfree;
 502                 sfs->f_bavail = osfs.os_bavail;
 503                 if (osfs.os_ffree < (__u64)sfs->f_ffree)
 504                         sfs->f_ffree = osfs.os_ffree;
 505         }
 506
 507 out:
 508         RETURN(rc);
 509 }
 510
 511 void ll_update_inode(struct inode *inode, struct mds_body *body,
 512                      struct lov_mds_md *lmm)
 513 {
 514         struct ll_inode_info *lli = ll_i2info(inode);
 515
 516         if (lmm != NULL)
 517                 obd_unpackmd(ll_i2obdconn(inode), &lli->lli_smd, lmm);
 518
 519         if (body->valid & OBD_MD_FLID)
 520                 inode->i_ino = body->ino;
 521         if (body->valid & OBD_MD_FLATIME)
 522                 inode->i_atime = body->atime;
 523         if (body->valid & OBD_MD_FLMTIME)
 524                 inode->i_mtime = body->mtime;
 525         if (body->valid & OBD_MD_FLCTIME)
 526                 inode->i_ctime = body->ctime;
 527         if (body->valid & OBD_MD_FLMODE)
 528                 inode->i_mode = (inode->i_mode & S_IFMT)|(body->mode & ~S_IFMT);
 529         if (body->valid & OBD_MD_FLTYPE)
 530                 inode->i_mode = (inode->i_mode & ~S_IFMT)|(body->mode & S_IFMT);
 531         if (body->valid & OBD_MD_FLUID)
 532                 inode->i_uid = body->uid;
 533         if (body->valid & OBD_MD_FLGID)
 534                 inode->i_gid = body->gid;
 535         if (body->valid & OBD_MD_FLFLAGS)
 536                 inode->i_flags = body->flags;
 537         if (body->valid & OBD_MD_FLNLINK)
 538                 inode->i_nlink = body->nlink;
 539         if (body->valid & OBD_MD_FLGENER)
 540                 inode->i_generation = body->generation;
 541         if (body->valid & OBD_MD_FLRDEV)
 542                 inode->i_rdev = to_kdev_t(body->rdev);
 543         if (body->valid & OBD_MD_FLSIZE)
 544                 inode->i_size = body->size;
 545         if (body->valid & OBD_MD_FLBLOCKS)
 546                 inode->i_blocks = body->blocks;
 547 }
 548
 549 int ll_read_inode2(struct inode *inode, void *opaque)
 550 {
 551         struct ll_read_inode2_cookie *lic = opaque;
 552         struct mds_body *body = lic->lic_body;
 553         struct ll_inode_info *lli = ll_i2info(inode);
 554         int rc = 0;
 555         ENTRY;
 556
 557         sema_init(&lli->lli_open_sem, 1);
 558
 559         LASSERT(!lli->lli_smd);
 560
 561         /* core attributes first */
 562         ll_update_inode(inode, body, lic ? lic->lic_lmm : NULL);
 563
 564         /* Get the authoritative file size */
 565         if (lli->lli_smd && S_ISREG(inode->i_mode)) {
 566                 rc = ll_file_size(inode, lli->lli_smd, NULL);
 567                 if (rc) {
 568                         CERROR("ll_file_size: %d\n", rc);
 569                         ll_clear_inode(inode);
 570                         make_bad_inode(inode);
 571                         RETURN(rc);
 572                 }
 573         }
 574
 575         /* OIDEBUG(inode); */
 576
 577         if (S_ISREG(inode->i_mode)) {
 578                 inode->i_op = &ll_file_inode_operations;
 579                 inode->i_fop = &ll_file_operations;
 580                 inode->i_mapping->a_ops = &ll_aops;
 581                 EXIT;
 582         } else if (S_ISDIR(inode->i_mode)) {
 583                 inode->i_op = &ll_dir_inode_operations;
 584                 inode->i_fop = &ll_dir_operations;
 585                 inode->i_mapping->a_ops = &ll_dir_aops;
 586                 EXIT;
 587         } else if (S_ISLNK(inode->i_mode)) {
 588                 inode->i_op = &ll_fast_symlink_inode_operations;
 589                 EXIT;
 590         } else {
 591                 init_special_inode(inode, inode->i_mode,
 592                                    kdev_t_to_nr(inode->i_rdev));
 593                 EXIT;
 594         }
 595
 596         return rc;
 597 }
 598
 599 static inline void invalidate_request_list(struct list_head *req_list)
 600 {
 601         struct list_head *tmp, *n;
 602         list_for_each_safe(tmp, n, req_list) {
 603                 struct ptlrpc_request *req =
 604                         list_entry(tmp, struct ptlrpc_request, rq_list);
 605                 CERROR("invalidating req xid %d op %d to %s:%d\n",
 606                        (unsigned long long)req->rq_xid, req->rq_reqmsg->opc,
 607                        req->rq_connection->c_remote_uuid,
 608                        req->rq_import->imp_client->cli_request_portal);
 609                 req->rq_flags |= PTL_RPC_FL_ERR;
 610                 wake_up(&req->rq_wait_for_rep);
 611         }
 612 }
 613
 614 void ll_umount_begin(struct super_block *sb)
 615 {
 616         struct ll_sb_info *sbi = ll_s2sbi(sb);
 617         struct list_head *ctmp;
 618
 619         ENTRY;
 620
 621         list_for_each(ctmp, &sbi->ll_conn_chain) {
 622                 struct ptlrpc_connection *conn;
 623                 conn = list_entry(ctmp, struct ptlrpc_connection, c_sb_chain);
 624
 625                 spin_lock(&conn->c_lock);
 626                 conn->c_flags |= CONN_INVALID;
 627                 invalidate_request_list(&conn->c_sending_head);
 628                 invalidate_request_list(&conn->c_delayed_head);
 629                 spin_unlock(&conn->c_lock);
 630         }
 631
 632         EXIT;
 633 }
 634
 635
 636 static kmem_cache_t *ll_inode_cachep;
 637
 638 static struct inode *ll_alloc_inode(struct super_block *sb)
 639 {
 640         struct ll_inode_info *lli;
 641         lli = kmem_cache_alloc(ll_inode_cachep, SLAB_KERNEL);
 642         if (!lli)
 643                 return NULL;
 644
 645         memset(lli, 0, (char *)&lli->lli_vfs_inode - (char *)lli);
 646         sema_init(&lli->lli_open_sem, 1);
 647
 648         return &lli->lli_vfs_inode;
 649 }
 650
 651 static void ll_destroy_inode(struct inode *inode)
 652 {
 653         kmem_cache_free(ll_inode_cachep, ll_i2info(inode));
 654 }
 655
 656 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
 657 {
 658         struct ll_inode_info *lli = foo;
 659
 660         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
 661             SLAB_CTOR_CONSTRUCTOR)
 662                 inode_init_once(&lli->lli_vfs_inode);
 663 }
 664
 665 int ll_init_inodecache(void)
 666 {
 667         ll_inode_cachep = kmem_cache_create("lustre_inode_cache",
 668                                             sizeof(struct ll_inode_info),
 669                                             0, SLAB_HWCACHE_ALIGN,
 670                                             init_once, NULL);
 671         if (ll_inode_cachep == NULL)
 672                 return -ENOMEM;
 673         return 0;
 674 }
 675
 676 void ll_destroy_inodecache(void)
 677 {
 678         if (kmem_cache_destroy(ll_inode_cachep))
 679                 CERROR("ll_inode_cache: not all structures were freed\n");
 680 }
 681
 682
 683
 684 /* exported operations */
 685 struct super_operations ll_super_operations =
 686 {
 687         alloc_inode: ll_alloc_inode,
 688         destroy_inode: ll_destroy_inode,
 689         clear_inode: ll_clear_inode,
 690         delete_inode: ll_delete_inode,
 691         put_super: ll_put_super,
 692         statfs: ll_statfs,
 693         umount_begin: ll_umount_begin
 694 };
 695
 696 struct file_system_type lustre_lite_fs_type = {
 697         .owner  = THIS_MODULE,
 698         .name =   "lustre_lite",
 699         .get_sb = ll_get_sb,
 700         .kill_sb = kill_litter_super,
 701 };
 702
 703 static int __init init_lustre_lite(void)
 704 {
 705         int rc;
 706         printk(KERN_INFO "Lustre Lite Client File System; "
 707                "info@clusterfs.com\n");
 708         rc = ll_init_inodecache();
 709         if (rc)
 710                 return -ENOMEM;
 711         ll_file_data_slab = kmem_cache_create("ll_file_data",
 712                                               sizeof(struct ll_file_data), 0,
 713                                               SLAB_HWCACHE_ALIGN, NULL, NULL);
 714         if (ll_file_data_slab == NULL) {
 715                 ll_destroy_inodecache();
 716                 return -ENOMEM;
 717         }
 718
 719         proc_lustre_fs_root = proc_lustre_root ?
 720                               proc_mkdir("llite", proc_lustre_root) : NULL;
 721
 722         return register_filesystem(&lustre_lite_fs_type);
 723 }
 724
 725 static void __exit exit_lustre_lite(void)
 726 {
 727         unregister_filesystem(&lustre_lite_fs_type);
 728         ll_destroy_inodecache();
 729         kmem_cache_destroy(ll_file_data_slab);
 730         if (proc_lustre_fs_root) {
 731                 lprocfs_remove(proc_lustre_fs_root);
 732                 proc_lustre_fs_root = NULL;
 733         }
 734 }
 735
 736 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 737 MODULE_DESCRIPTION("Lustre Lite Client File System");
 738 MODULE_LICENSE("GPL");
 739
 740 module_init(init_lustre_lite);
 741 module_exit(exit_lustre_lite);
 742 #endif