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 #include <asm/statfs.h>
  38 kmem_cache_t *ll_file_data_slab;
  39 extern struct address_space_operations ll_aops;
  40 extern struct address_space_operations ll_dir_aops;
  41 struct super_operations ll_super_operations;
  42
  43 /* /proc/lustre/llite root that tracks llite mount points */
  44 struct proc_dir_entry *proc_lustre_fs_root = NULL;
  45 /* lproc_llite.c */
  46 extern int lprocfs_register_mountpoint(struct proc_dir_entry *parent,
  47                                        struct super_block *sb,
  48                                        char *osc, char *mdc);
  49
  50 extern int ll_init_inodecache(void);
  51 extern void ll_destroy_inodecache(void);
  52 extern int ll_recover(struct recovd_data *, int);
  53 extern int ll_commitcbd_setup(struct ll_sb_info *);
  54 extern int ll_commitcbd_cleanup(struct ll_sb_info *);
  55 int ll_read_inode2(struct inode *inode, void *opaque);
  56
  57 extern int ll_proc_namespace(struct super_block* sb, char* osc, char* mdc);
  58
  59 static char *ll_read_opt(const char *opt, char *data)
  60 {
  61         char *value;
  62         char *retval;
  63         ENTRY;
  64
  65         CDEBUG(D_SUPER, "option: %s, data %s\n", opt, data);
  66         if ( strncmp(opt, data, strlen(opt)) )
  67                 RETURN(NULL);
  68         if ( (value = strchr(data, '=')) == NULL )
  69                 RETURN(NULL);
  70
  71         value++;
  72         OBD_ALLOC(retval, strlen(value) + 1);
  73         if ( !retval ) {
  74                 CERROR("out of memory!\n");
  75                 RETURN(NULL);
  76         }
  77
  78         memcpy(retval, value, strlen(value)+1);
  79         CDEBUG(D_SUPER, "Assigned option: %s, value %s\n", opt, retval);
  80         RETURN(retval);
  81 }
  82
  83 static int ll_set_opt(const char *opt, char *data, int fl)
  84 {
  85         ENTRY;
  86
  87         CDEBUG(D_SUPER, "option: %s, data %s\n", opt, data);
  88         if ( strncmp(opt, data, strlen(opt)) )
  89                 RETURN(0);
  90         else
  91                 RETURN(fl);
  92 }
  93
  94 static void ll_options(char *options, char **ost, char **mds, int *flags)
  95 {
  96         char *opt_ptr = options;
  97         char *this_char;
  98         ENTRY;
  99
 100         if (!options) {
 101                 EXIT;
 102                 return;
 103         }
 104
 105         while ((this_char = strsep (&opt_ptr, ",")) != NULL) {
 106                 CDEBUG(D_SUPER, "this_char %s\n", this_char);
 107                 if ( (!*ost && (*ost = ll_read_opt("osc", this_char)))||
 108                      (!*mds && (*mds = ll_read_opt("mdc", this_char)))||
 109                      (!(*flags & LL_SBI_NOLCK) && ((*flags) = (*flags) |
 110                       ll_set_opt("nolock", this_char, LL_SBI_NOLCK))) )
 111                         continue;
 112         }
 113         EXIT;
 114 }
 115
 116 #ifndef log2
 117 #define log2(n) ffz(~(n))
 118 #endif
 119
 120
 121 static int ll_fill_super(struct super_block *sb, void *data, int silent)
 122 {
 123         struct inode *root = 0;
 124         struct obd_device *obd;
 125         struct ll_sb_info *sbi;
 126         char *osc = NULL;
 127         char *mdc = NULL;
 128         int err;
 129         struct ll_fid rootfid;
 130         struct obd_statfs osfs;
 131         struct ptlrpc_request *request = NULL;
 132         struct ptlrpc_connection *mdc_conn;
 133         struct ll_read_inode2_cookie lic;
 134         class_uuid_t uuid;
 135         struct obd_uuid param_uuid;
 136
 137         ENTRY;
 138
 139         OBD_ALLOC(sbi, sizeof(*sbi));
 140         if (!sbi)
 141                 RETURN(-ENOMEM);
 142
 143         INIT_LIST_HEAD(&sbi->ll_conn_chain);
 144         INIT_LIST_HEAD(&sbi->ll_orphan_dentry_list);
 145         generate_random_uuid(uuid);
 146         class_uuid_unparse(uuid, &sbi->ll_sb_uuid);
 147
 148         sb->s_fs_info = sbi;
 149
 150         ll_options(data, &osc, &mdc, &sbi->ll_flags);
 151
 152         if (!osc) {
 153                 CERROR("no osc\n");
 154                 GOTO(out_free, sb = NULL);
 155         }
 156
 157         if (!mdc) {
 158                 CERROR("no mdc\n");
 159                 GOTO(out_free, sb = NULL);
 160         }
 161
 162         strncpy(param_uuid.uuid, mdc, sizeof(param_uuid.uuid));
 163         obd = class_uuid2obd(&param_uuid);
 164         if (!obd) {
 165                 CERROR("MDC %s: not setup or attached\n", mdc);
 166                 GOTO(out_free, sb = NULL);
 167         }
 168
 169         err = obd_connect(&sbi->ll_mdc_conn, obd, &sbi->ll_sb_uuid,
 170                           ptlrpc_recovd, ll_recover);
 171         if (err) {
 172                 CERROR("cannot connect to %s: rc = %d\n", mdc, err);
 173                 GOTO(out_free, sb = NULL);
 174         }
 175
 176         mdc_conn = sbi2mdc(sbi)->cl_import.imp_connection;
 177         list_add(&mdc_conn->c_sb_chain, &sbi->ll_conn_chain);
 178
 179         obd = class_uuid2obd(osc);
 180         if (!obd) {
 181                 CERROR("OSC %s: not setup or attached\n", osc);
 182                 GOTO(out_mdc, sb = NULL);
 183         }
 184
 185         err = obd_connect(&sbi->ll_osc_conn, obd, &sbi->ll_sb_uuid,
 186                           ptlrpc_recovd, ll_recover);
 187         if (err) {
 188                 CERROR("cannot connect to %s: rc = %d\n", osc, err);
 189                 GOTO(out_mdc, sb = NULL);
 190         }
 191
 192         err = mdc_getstatus(&sbi->ll_mdc_conn, &rootfid);
 193         if (err) {
 194                 CERROR("cannot mds_connect: rc = %d\n", err);
 195                 GOTO(out_mdc, sb = NULL);
 196         }
 197         CDEBUG(D_SUPER, "rootfid "LPU64"\n", rootfid.id);
 198         sbi->ll_rootino = rootfid.id;
 199
 200         memset(&osfs, 0, sizeof(osfs));
 201         err = obd_statfs(&sbi->ll_mdc_conn, &osfs);
 202         sb->s_blocksize = osfs.os_bsize;
 203         sb->s_blocksize_bits = log2(osfs.os_bsize);
 204         sb->s_magic = LL_SUPER_MAGIC;
 205         sb->s_maxbytes = (1ULL << (32 + 9)) - osfs.os_bsize;
 206
 207         sb->s_op = &ll_super_operations;
 208
 209         /* make root inode */
 210         err = mdc_getattr(&sbi->ll_mdc_conn, sbi->ll_rootino, S_IFDIR,
 211                           OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, 0, &request);
 212         if (err) {
 213                 CERROR("mdc_getattr failed for root: rc = %d\n", err);
 214                 GOTO(out_request, sb = NULL);
 215         }
 216
 217         /* initialize committed transaction callback daemon */
 218         spin_lock_init(&sbi->ll_commitcbd_lock);
 219         init_waitqueue_head(&sbi->ll_commitcbd_waitq);
 220         init_waitqueue_head(&sbi->ll_commitcbd_ctl_waitq);
 221         sbi->ll_commitcbd_flags = 0;
 222         err = ll_commitcbd_setup(sbi);
 223         if (err) {
 224                 CERROR("failed to start commit callback daemon: rc = %d\n",err);
 225                 GOTO(out_request, sb = NULL);
 226         }
 227
 228         lic.lic_body = lustre_msg_buf(request->rq_repmsg, 0);
 229         lic.lic_lmm = NULL;
 230         root = iget5_locked(sb, sbi->ll_rootino, NULL,
 231                             ll_read_inode2, &lic);
 232
 233         if (root) {
 234                 sb->s_root = d_alloc_root(root);
 235                 root->i_state &= ~(I_LOCK | I_NEW);
 236         } else {
 237                 CERROR("lustre_lite: bad iget4 for root\n");
 238                 GOTO(out_cdb, sb = NULL);
 239         }
 240
 241         ptlrpc_req_finished(request);
 242         request = NULL;
 243
 244         if (proc_lustre_fs_root) {
 245                 err = lprocfs_register_mountpoint(proc_lustre_fs_root, sb,
 246                                                   osc, mdc);
 247                 if (err < 0)
 248                         CERROR("could not register mount in /proc/lustre");
 249         }
 250
 251 out_dev:
 252         if (mdc)
 253                 OBD_FREE(mdc, strlen(mdc) + 1);
 254         if (osc)
 255                 OBD_FREE(osc, strlen(osc) + 1);
 256
 257         RETURN(0);
 258
 259 out_cdb:
 260         ll_commitcbd_cleanup(sbi);
 261 out_request:
 262         ptlrpc_req_finished(request);
 263         obd_disconnect(&sbi->ll_osc_conn);
 264 out_mdc:
 265         obd_disconnect(&sbi->ll_mdc_conn);
 266 out_free:
 267         OBD_FREE(sbi, sizeof(*sbi));
 268
 269         goto out_dev;
 270 } /* ll_fill_super */
 271
 272 struct super_block * ll_get_sb(struct file_system_type *fs_type,
 273                                int flags, char *devname, void * data)
 274 {
 275         return get_sb_nodev(fs_type, flags, data, ll_fill_super);
 276 }
 277
 278 static void ll_put_super(struct super_block *sb)
 279 {
 280         struct ll_sb_info *sbi = ll_s2sbi(sb);
 281         struct list_head *tmp, *next;
 282         struct ll_fid rootfid;
 283         ENTRY;
 284
 285         list_del(&sbi->ll_conn_chain);
 286         ll_commitcbd_cleanup(sbi);
 287         obd_disconnect(&sbi->ll_osc_conn);
 288
 289         /* NULL request to force sync on the MDS, and get the last_committed
 290          * value to flush remaining RPCs from the pending queue on client.
 291          *
 292          * XXX This should be an mdc_sync() call to sync the whole MDS fs,
 293          *     which we can call for other reasons as well.
 294          */
 295         mdc_getstatus(&sbi->ll_mdc_conn, &rootfid);
 296
 297         if (sbi->ll_proc_root) {
 298                 lprocfs_remove(sbi->ll_proc_root);
 299         sbi->ll_proc_root = NULL;
 300         }
 301
 302         obd_disconnect(&sbi->ll_mdc_conn);
 303
 304         spin_lock(&dcache_lock);
 305         list_for_each_safe(tmp, next, &sbi->ll_orphan_dentry_list){
 306                 struct dentry *dentry = list_entry(tmp, struct dentry, d_hash);
 307                 shrink_dcache_parent(dentry);
 308         }
 309         spin_unlock(&dcache_lock);
 310
 311         OBD_FREE(sbi, sizeof(*sbi));
 312
 313         EXIT;
 314 } /* ll_put_super */
 315
 316 static void ll_clear_inode(struct inode *inode)
 317 {
 318         struct ll_sb_info *sbi = ll_i2sbi(inode);
 319         struct ll_inode_info *lli = ll_i2info(inode);
 320         int rc;
 321         ENTRY;
 322
 323 #warning "Is there a reason we don't do this in 2.5, but we do in 2.4?"
 324 #if 0
 325         rc = mdc_cancel_unused(&sbi->ll_mdc_conn, inode, LDLM_FL_NO_CALLBACK);
 326         if (rc < 0) {
 327                 CERROR("mdc_cancel_unused: %d\n", rc);
 328                 /* XXX FIXME do something dramatic */
 329         }
 330
 331         if (lli->lli_smd) {
 332                 rc = obd_cancel_unused(&sbi->ll_osc_conn, lli->lli_smd, 0);
 333                 if (rc < 0) {
 334                         CERROR("obd_cancel_unused: %d\n", rc);
 335                         /* XXX FIXME do something dramatic */
 336                 }
 337         }
 338 #endif
 339
 340         if (atomic_read(&inode->i_count) != 0)
 341                 CERROR("clearing in-use inode %lu: count = %d\n",
 342                        inode->i_ino, atomic_read(&inode->i_count));
 343
 344         if (lli->lli_smd)
 345                 obd_free_memmd(&sbi->ll_osc_conn, &lli->lli_smd);
 346
 347         if (lli->lli_symlink_name) {
 348                 OBD_FREE(lli->lli_symlink_name,strlen(lli->lli_symlink_name)+1);
 349                 lli->lli_symlink_name = NULL;
 350         }
 351
 352         EXIT;
 353 }
 354
 355 #if 0
 356 static void ll_delete_inode(struct inode *inode)
 357 {
 358         ENTRY;
 359         if (S_ISREG(inode->i_mode)) {
 360                 int err;
 361                 struct obdo *oa;
 362                 struct lov_stripe_md *lsm = ll_i2info(inode)->lli_smd;
 363
 364                 /* mcreate with no open */
 365                 if (!lsm)
 366                         GOTO(out, 0);
 367
 368                 if (lsm->lsm_object_id == 0) {
 369                         CERROR("This really happens\n");
 370                         /* No obdo was ever created */
 371                         GOTO(out, 0);
 372                 }
 373
 374                 oa = obdo_alloc();
 375                 if (oa == NULL)
 376                         GOTO(out, -ENOMEM);
 377
 378                 oa->o_id = lsm->lsm_object_id;
 379                 oa->o_mode = inode->i_mode;
 380                 oa->o_valid = OBD_MD_FLID | OBD_MD_FLTYPE;
 381
 382                 err = obd_destroy(ll_i2obdconn(inode), oa, lsm);
 383                 obdo_free(oa);
 384                 if (err)
 385                         CDEBUG(D_SUPER, "obd destroy objid "LPX64" error %d\n",
 386                                lsm->lsm_object_id, err);
 387         }
 388 out:
 389         clear_inode(inode);
 390         EXIT;
 391 }
 392 #endif
 393
 394 /* like inode_setattr, but doesn't mark the inode dirty */
 395 static int ll_attr2inode(struct inode * inode, struct iattr * attr, int trunc)
 396 {
 397         unsigned int ia_valid = attr->ia_valid;
 398         int error = 0;
 399
 400         if ((ia_valid & ATTR_SIZE) && trunc) {
 401                 error = vmtruncate(inode, attr->ia_size);
 402                 if (error)
 403                         goto out;
 404         } else if (ia_valid & ATTR_SIZE)
 405                 inode->i_size = attr->ia_size;
 406
 407         if (ia_valid & ATTR_UID)
 408                 inode->i_uid = attr->ia_uid;
 409         if (ia_valid & ATTR_GID)
 410                 inode->i_gid = attr->ia_gid;
 411         if (ia_valid & ATTR_ATIME)
 412                 inode->i_atime = attr->ia_atime;
 413         if (ia_valid & ATTR_MTIME)
 414                 inode->i_mtime = attr->ia_mtime;
 415         if (ia_valid & ATTR_CTIME)
 416                 inode->i_ctime = attr->ia_ctime;
 417         if (ia_valid & ATTR_MODE) {
 418                 inode->i_mode = attr->ia_mode;
 419                 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 420                         inode->i_mode &= ~S_ISGID;
 421         }
 422 out:
 423         return error;
 424 }
 425
 426 int ll_inode_setattr(struct inode *inode, struct iattr *attr, int do_trunc)
 427 {
 428         struct ptlrpc_request *request = NULL;
 429         struct ll_sb_info *sbi = ll_i2sbi(inode);
 430         int err = 0;
 431
 432         ENTRY;
 433
 434         /* change incore inode */
 435         ll_attr2inode(inode, attr, do_trunc);
 436
 437         /* Don't send size changes to MDS to avoid "fast EA" problems, and
 438          * also avoid a pointless RPC (we get file size from OST anyways).
 439          */
 440         attr->ia_valid &= ~ATTR_SIZE;
 441         if (attr->ia_valid) {
 442                 err = mdc_setattr(&sbi->ll_mdc_conn, inode, attr, NULL, 0,
 443                                   &request);
 444                 if (err)
 445                         CERROR("mdc_setattr fails: err = %d\n", err);
 446
 447                 ptlrpc_req_finished(request);
 448                 if (S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_MTIME_SET) {
 449                         struct lov_stripe_md *lsm = ll_i2info(inode)->lli_smd;
 450                         struct obdo oa;
 451                         int err2;
 452
 453                         CDEBUG(D_ERROR, "setting mtime on OST\n");
 454                         oa.o_id = lsm->lsm_object_id;
 455                         oa.o_mode = S_IFREG;
 456                         oa.o_valid = OBD_MD_FLID |OBD_MD_FLTYPE |OBD_MD_FLMTIME;
 457                         oa.o_mtime = attr->ia_mtime.tv_sec;
 458                         err2 = obd_setattr(&sbi->ll_osc_conn, &oa, lsm, NULL);
 459                         if (err2) {
 460                                 CERROR("obd_setattr fails: rc=%d\n", err);
 461                                 if (!err)
 462                                         err = err2;
 463                         }
 464                 }
 465         }
 466
 467         RETURN(err);
 468 }
 469
 470 int ll_setattr(struct dentry *de, struct iattr *attr)
 471 {
 472         int rc = inode_change_ok(de->d_inode, attr);
 473
 474         if (rc)
 475                 return rc;
 476
 477         return ll_inode_setattr(de->d_inode, attr, 1);
 478 }
 479
 480 static int ll_statfs(struct super_block *sb, struct statfs *sfs)
 481 {
 482         struct ll_sb_info *sbi = ll_s2sbi(sb);
 483         struct obd_statfs osfs;
 484         int rc;
 485         ENTRY;
 486
 487         memset(sfs, 0, sizeof(*sfs));
 488         rc = obd_statfs(&sbi->ll_mdc_conn, &osfs);
 489         statfs_unpack(sfs, &osfs);
 490         if (rc)
 491                 CERROR("mdc_statfs fails: rc = %d\n", rc);
 492         else
 493                 CDEBUG(D_SUPER, "mdc_statfs shows blocks "LPU64"/"LPU64
 494                        " objects "LPU64"/"LPU64"\n",
 495                        osfs.os_bavail, osfs.os_blocks,
 496                        osfs.os_ffree, osfs.os_files);
 497
 498         /* temporary until mds_statfs returns statfs info for all OSTs */
 499         if (!rc) {
 500                 rc = obd_statfs(&sbi->ll_osc_conn, &osfs);
 501                 if (rc) {
 502                         CERROR("obd_statfs fails: rc = %d\n", rc);
 503                         GOTO(out, rc);
 504                 }
 505                 CDEBUG(D_SUPER, "obd_statfs shows blocks "LPU64"/"LPU64
 506                        " objects "LPU64"/"LPU64"\n",
 507                        osfs.os_bavail, osfs.os_blocks,
 508                        osfs.os_ffree, osfs.os_files);
 509
 510                 while (osfs.os_blocks > ~0UL) {
 511                         sfs->f_bsize <<= 1;
 512
 513                         osfs.os_blocks >>= 1;
 514                         osfs.os_bfree >>= 1;
 515                         osfs.os_bavail >>= 1;
 516                 }
 517                 sfs->f_blocks = osfs.os_blocks;
 518                 sfs->f_bfree = osfs.os_bfree;
 519                 sfs->f_bavail = osfs.os_bavail;
 520                 if (osfs.os_ffree < (__u64)sfs->f_ffree)
 521                         sfs->f_ffree = osfs.os_ffree;
 522         }
 523
 524 out:
 525         RETURN(rc);
 526 }
 527
 528 void ll_update_inode(struct inode *inode, struct mds_body *body,
 529                      struct lov_mds_md *lmm)
 530 {
 531         struct ll_inode_info *lli = ll_i2info(inode);
 532
 533         if (lmm != NULL)
 534                 obd_unpackmd(ll_i2obdconn(inode), &lli->lli_smd, lmm);
 535
 536         if (body->valid & OBD_MD_FLID)
 537                 inode->i_ino = body->ino;
 538         if (body->valid & OBD_MD_FLATIME)
 539                 inode->i_atime.tv_sec = body->atime;
 540         if (body->valid & OBD_MD_FLMTIME)
 541                 inode->i_mtime.tv_sec = body->mtime;
 542         if (body->valid & OBD_MD_FLCTIME)
 543                 inode->i_ctime.tv_sec = body->ctime;
 544         if (body->valid & OBD_MD_FLMODE)
 545                 inode->i_mode = (inode->i_mode & S_IFMT)|(body->mode & ~S_IFMT);
 546         if (body->valid & OBD_MD_FLTYPE)
 547                 inode->i_mode = (inode->i_mode & ~S_IFMT)|(body->mode & S_IFMT);
 548         if (body->valid & OBD_MD_FLUID)
 549                 inode->i_uid = body->uid;
 550         if (body->valid & OBD_MD_FLGID)
 551                 inode->i_gid = body->gid;
 552         if (body->valid & OBD_MD_FLFLAGS)
 553                 inode->i_flags = body->flags;
 554         if (body->valid & OBD_MD_FLNLINK)
 555                 inode->i_nlink = body->nlink;
 556         if (body->valid & OBD_MD_FLGENER)
 557                 inode->i_generation = body->generation;
 558         if (body->valid & OBD_MD_FLRDEV)
 559                 inode->i_rdev = to_kdev_t(body->rdev);
 560         if (body->valid & OBD_MD_FLSIZE)
 561                 inode->i_size = body->size;
 562         if (body->valid & OBD_MD_FLBLOCKS)
 563                 inode->i_blocks = body->blocks;
 564 }
 565
 566 int ll_read_inode2(struct inode *inode, void *opaque)
 567 {
 568         struct ll_read_inode2_cookie *lic = opaque;
 569         struct mds_body *body = lic->lic_body;
 570         struct ll_inode_info *lli = ll_i2info(inode);
 571         int rc = 0;
 572         ENTRY;
 573
 574         sema_init(&lli->lli_open_sem, 1);
 575
 576         LASSERT(!lli->lli_smd);
 577
 578         /* core attributes first */
 579         ll_update_inode(inode, body, lic ? lic->lic_lmm : NULL);
 580
 581         /* Get the authoritative file size */
 582         if (lli->lli_smd && S_ISREG(inode->i_mode)) {
 583                 rc = ll_file_size(inode, lli->lli_smd, NULL);
 584                 if (rc) {
 585                         CERROR("ll_file_size: %d\n", rc);
 586                         ll_clear_inode(inode);
 587                         make_bad_inode(inode);
 588                         RETURN(rc);
 589                 }
 590         }
 591
 592         /* OIDEBUG(inode); */
 593
 594         if (S_ISREG(inode->i_mode)) {
 595                 inode->i_op = &ll_file_inode_operations;
 596                 inode->i_fop = &ll_file_operations;
 597                 inode->i_mapping->a_ops = &ll_aops;
 598                 EXIT;
 599         } else if (S_ISDIR(inode->i_mode)) {
 600                 inode->i_op = &ll_dir_inode_operations;
 601                 inode->i_fop = &ll_dir_operations;
 602                 inode->i_mapping->a_ops = &ll_dir_aops;
 603                 EXIT;
 604         } else if (S_ISLNK(inode->i_mode)) {
 605                 inode->i_op = &ll_fast_symlink_inode_operations;
 606                 EXIT;
 607         } else {
 608                 init_special_inode(inode, inode->i_mode,
 609                                    kdev_t_to_nr(inode->i_rdev));
 610                 EXIT;
 611         }
 612
 613         return rc;
 614 }
 615
 616 static inline void invalidate_request_list(struct list_head *req_list)
 617 {
 618         struct list_head *tmp, *n;
 619         list_for_each_safe(tmp, n, req_list) {
 620                 struct ptlrpc_request *req =
 621                         list_entry(tmp, struct ptlrpc_request, rq_list);
 622                 CERROR("invalidating req xid %d op %d to %s:%d\n",
 623                        (unsigned long long)req->rq_xid, req->rq_reqmsg->opc,
 624                        req->rq_connection->c_remote_uuid,
 625                        req->rq_import->imp_client->cli_request_portal);
 626                 req->rq_flags |= PTL_RPC_FL_ERR;
 627                 wake_up(&req->rq_wait_for_rep);
 628         }
 629 }
 630
 631 void ll_umount_begin(struct super_block *sb)
 632 {
 633         struct ll_sb_info *sbi = ll_s2sbi(sb);
 634         struct list_head *ctmp;
 635
 636         ENTRY;
 637
 638         list_for_each(ctmp, &sbi->ll_conn_chain) {
 639                 struct ptlrpc_connection *conn;
 640                 conn = list_entry(ctmp, struct ptlrpc_connection, c_sb_chain);
 641
 642                 spin_lock(&conn->c_lock);
 643                 conn->c_flags |= CONN_INVALID;
 644                 /*invalidate_request_list(&conn->c_sending_head);*/
 645                 invalidate_request_list(&conn->c_delayed_head);
 646                 spin_unlock(&conn->c_lock);
 647         }
 648
 649         EXIT;
 650 }
 651
 652
 653 static kmem_cache_t *ll_inode_cachep;
 654
 655 static struct inode *ll_alloc_inode(struct super_block *sb)
 656 {
 657         struct ll_inode_info *lli;
 658         lli = kmem_cache_alloc(ll_inode_cachep, SLAB_KERNEL);
 659         if (!lli)
 660                 return NULL;
 661
 662         memset(lli, 0, (char *)&lli->lli_vfs_inode - (char *)lli);
 663         sema_init(&lli->lli_open_sem, 1);
 664
 665         return &lli->lli_vfs_inode;
 666 }
 667
 668 static void ll_destroy_inode(struct inode *inode)
 669 {
 670         kmem_cache_free(ll_inode_cachep, ll_i2info(inode));
 671 }
 672
 673 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
 674 {
 675         struct ll_inode_info *lli = foo;
 676
 677         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
 678             SLAB_CTOR_CONSTRUCTOR)
 679                 inode_init_once(&lli->lli_vfs_inode);
 680 }
 681
 682 int ll_init_inodecache(void)
 683 {
 684         ll_inode_cachep = kmem_cache_create("lustre_inode_cache",
 685                                             sizeof(struct ll_inode_info),
 686                                             0, SLAB_HWCACHE_ALIGN,
 687                                             init_once, NULL);
 688         if (ll_inode_cachep == NULL)
 689                 return -ENOMEM;
 690         return 0;
 691 }
 692
 693 void ll_destroy_inodecache(void)
 694 {
 695         if (kmem_cache_destroy(ll_inode_cachep))
 696                 CERROR("ll_inode_cache: not all structures were freed\n");
 697 }
 698
 699
 700
 701 /* exported operations */
 702 struct super_operations ll_super_operations =
 703 {
 704         alloc_inode: ll_alloc_inode,
 705         destroy_inode: ll_destroy_inode,
 706         clear_inode: ll_clear_inode,
 707 //        delete_inode: ll_delete_inode,
 708         put_super: ll_put_super,
 709         statfs: ll_statfs,
 710         umount_begin: ll_umount_begin
 711 };
 712
 713
 714 struct file_system_type lustre_lite_fs_type = {
 715         .owner  = THIS_MODULE,
 716         .name =   "lustre_lite",
 717         .get_sb = ll_get_sb,
 718         .kill_sb = kill_anon_super,
 719 };
 720
 721 static int __init init_lustre_lite(void)
 722 {
 723         int rc;
 724         printk(KERN_INFO "Lustre Lite Client File System; "
 725                "info@clusterfs.com\n");
 726         rc = ll_init_inodecache();
 727         if (rc)
 728                 return -ENOMEM;
 729         ll_file_data_slab = kmem_cache_create("ll_file_data",
 730                                               sizeof(struct ll_file_data), 0,
 731                                               SLAB_HWCACHE_ALIGN, NULL, NULL);
 732         if (ll_file_data_slab == NULL) {
 733                 ll_destroy_inodecache();
 734                 return -ENOMEM;
 735         }
 736
 737         proc_lustre_fs_root = proc_lustre_root ?
 738                               proc_mkdir("llite", proc_lustre_root) : NULL;
 739
 740         return register_filesystem(&lustre_lite_fs_type);
 741 }
 742
 743 static void __exit exit_lustre_lite(void)
 744 {
 745         unregister_filesystem(&lustre_lite_fs_type);
 746         ll_destroy_inodecache();
 747         kmem_cache_destroy(ll_file_data_slab);
 748         if (proc_lustre_fs_root) {
 749                 lprocfs_remove(proc_lustre_fs_root);
 750                 proc_lustre_fs_root = NULL;
 751         }
 752 }
 753
 754 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 755 MODULE_DESCRIPTION("Lustre Lite Client File System");
 756 MODULE_LICENSE("GPL");
 757
 758 module_init(init_lustre_lite);
 759 module_exit(exit_lustre_lite);
 760 #endif