lustre/lvfs/lvfs_linux.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  lustre/lib/lvfs_linux.c
   5  *  Lustre filesystem abstraction routines
   6  *
   7  *  Copyright (C) 2002, 2003 Cluster File Systems, Inc.
   8  *   Author: Andreas Dilger <adilger@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
  30 #define DEBUG_SUBSYSTEM S_FILTER
  31
  32 #include <linux/version.h>
  33 #include <linux/fs.h>
  34 #include <asm/unistd.h>
  35 #include <linux/slab.h>
  36 #include <linux/pagemap.h>
  37 #include <linux/quotaops.h>
  38 #include <linux/version.h>
  39 #include <libcfs/kp30.h>
  40 #include <linux/lustre_fsfilt.h>
  41 #include <linux/obd.h>
  42 #include <linux/obd_class.h>
  43 #include <linux/module.h>
  44 #include <linux/init.h>
  45 #include <linux/lustre_compat25.h>
  46 #include <linux/lvfs.h>
  47 #include "lvfs_internal.h"
  48
  49 #include <linux/obd.h>
  50 #include <linux/lustre_lib.h>
  51 #include <linux/lustre_mds.h>   /* for mds_grp_hash_entry */
  52
  53 atomic_t obd_memory;
  54 int obd_memmax;
  55
  56 /* Debugging check only needed during development */
  57 #ifdef OBD_CTXT_DEBUG
  58 # define ASSERT_CTXT_MAGIC(magic) LASSERT((magic) == OBD_RUN_CTXT_MAGIC)
  59 # define ASSERT_NOT_KERNEL_CTXT(msg) LASSERTF(!segment_eq(get_fs(), get_ds()),\
  60                                               msg)
  61 # define ASSERT_KERNEL_CTXT(msg) LASSERTF(segment_eq(get_fs(), get_ds()), msg)
  62
  63 #else
  64 # define ASSERT_CTXT_MAGIC(magic) do {} while(0)
  65 # define ASSERT_NOT_KERNEL_CTXT(msg) do {} while(0)
  66 # define ASSERT_KERNEL_CTXT(msg) do {} while(0)
  67 #endif
  68
  69 static void push_group_info(struct lvfs_run_ctxt *save,
  70                             struct group_info *ginfo)
  71 {
  72         if (!ginfo) {
  73                 save->ngroups = current_ngroups;
  74                 current_ngroups = 0;
  75         } else {
  76 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,4)
  77                 task_lock(current);
  78                 save->group_info = current->group_info;
  79                 current->group_info = ginfo;
  80                 task_unlock(current);
  81 #else
  82                 LASSERT(ginfo->ngroups <= NGROUPS);
  83                 /* save old */
  84                 save->group_info.ngroups = current->ngroups;
  85                 if (current->ngroups)
  86                         memcpy(save->group_info.small_block, current->groups,
  87                                current->ngroups);
  88                 /* push new */
  89                 current->ngroups = ginfo->ngroups;
  90                 if (ginfo->ngroups)
  91                         memcpy(current->groups, ginfo->small_block,
  92                                current->ngroups);
  93 #endif
  94         }
  95 }
  96
  97 static void pop_group_info(struct lvfs_run_ctxt *save,
  98                            struct group_info *ginfo)
  99 {
 100         if (!ginfo) {
 101                 current_ngroups = save->ngroups;
 102         } else {
 103 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,4)
 104                 task_lock(current);
 105                 current->group_info = save->group_info;
 106                 task_unlock(current);
 107 #else
 108                 current->ngroups = ginfo->ngroups;
 109                 if (current->ngroups)
 110                         memcpy(current->groups, save->group_info.small_block,
 111                                current->ngroups);
 112 #endif
 113         }
 114 }
 115
 116 /* push / pop to root of obd store */
 117 void push_ctxt(struct lvfs_run_ctxt *save, struct lvfs_run_ctxt *new_ctx,
 118                struct lvfs_ucred *uc)
 119 {
 120         //ASSERT_NOT_KERNEL_CTXT("already in kernel context!\n");
 121         ASSERT_CTXT_MAGIC(new_ctx->magic);
 122         LASSERT(save->magic != OBD_RUN_CTXT_MAGIC || save->pid != current->pid);
 123         OBD_SET_CTXT_MAGIC(save);
 124         save->pid = current->pid;
 125
 126         /*
 127         CDEBUG(D_INFO,
 128                "= push %p->%p = cur fs %p pwd %p:d%d:i%d (%.*s), pwdmnt %p:%d\n",
 129                save, current, current->fs, current->fs->pwd,
 130                atomic_read(&current->fs->pwd->d_count),
 131                atomic_read(&current->fs->pwd->d_inode->i_count),
 132                current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
 133                current->fs->pwdmnt,
 134                atomic_read(&current->fs->pwdmnt->mnt_count));
 135         */
 136
 137         save->fs = get_fs();
 138         LASSERT(atomic_read(&current->fs->pwd->d_count));
 139         LASSERT(atomic_read(&new_ctx->pwd->d_count));
 140         save->pwd = dget(current->fs->pwd);
 141         save->pwdmnt = mntget(current->fs->pwdmnt);
 142         save->ngroups = current_ngroups;
 143         save->luc.luc_umask = current->fs->umask;
 144
 145         LASSERT(save->pwd);
 146         LASSERT(save->pwdmnt);
 147         LASSERT(new_ctx->pwd);
 148         LASSERT(new_ctx->pwdmnt);
 149
 150         if (uc) {
 151                 save->luc.luc_uid = current->uid;
 152                 save->luc.luc_gid = current->gid;
 153                 save->luc.luc_fsuid = current->fsuid;
 154                 save->luc.luc_fsgid = current->fsgid;
 155                 save->luc.luc_cap = current->cap_effective;
 156
 157                 current->uid = uc->luc_uid;
 158                 current->gid = uc->luc_gid;
 159                 current->fsuid = uc->luc_fsuid;
 160                 current->fsgid = uc->luc_fsgid;
 161                 current->cap_effective = uc->luc_cap;
 162
 163                 push_group_info(save, uc->luc_ginfo);
 164         }
 165         current->fs->umask = 0; /* umask already applied on client */
 166         set_fs(new_ctx->fs);
 167         set_fs_pwd(current->fs, new_ctx->pwdmnt, new_ctx->pwd);
 168
 169         /*
 170         CDEBUG(D_INFO,
 171                "= push %p->%p = cur fs %p pwd %p:d%d:i%d (%.*s), pwdmnt %p:%d\n",
 172                new_ctx, current, current->fs, current->fs->pwd,
 173                atomic_read(&current->fs->pwd->d_count),
 174                atomic_read(&current->fs->pwd->d_inode->i_count),
 175                current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
 176                current->fs->pwdmnt,
 177                atomic_read(&current->fs->pwdmnt->mnt_count));
 178         */
 179 }
 180 EXPORT_SYMBOL(push_ctxt);
 181
 182 void pop_ctxt(struct lvfs_run_ctxt *saved, struct lvfs_run_ctxt *new_ctx,
 183               struct lvfs_ucred *uc)
 184 {
 185         //printk("pc0");
 186         ASSERT_CTXT_MAGIC(saved->magic);
 187         LASSERT(saved->pid == current->pid);
 188         saved->magic = 0;
 189         saved->pid = 0;
 190         //printk("pc1");
 191         ASSERT_KERNEL_CTXT("popping non-kernel context!\n");
 192
 193         /*
 194         CDEBUG(D_INFO,
 195                " = pop  %p==%p = cur %p pwd %p:d%d:i%d (%.*s), pwdmnt %p:%d\n",
 196                new_ctx, current, current->fs, current->fs->pwd,
 197                atomic_read(&current->fs->pwd->d_count),
 198                atomic_read(&current->fs->pwd->d_inode->i_count),
 199                current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
 200                current->fs->pwdmnt,
 201                atomic_read(&current->fs->pwdmnt->mnt_count));
 202         */
 203
 204         LASSERT(current->fs->pwd == new_ctx->pwd);
 205         LASSERT(current->fs->pwdmnt == new_ctx->pwdmnt);
 206
 207         set_fs(saved->fs);
 208         set_fs_pwd(current->fs, saved->pwdmnt, saved->pwd);
 209
 210         dput(saved->pwd);
 211         mntput(saved->pwdmnt);
 212         current->fs->umask = saved->luc.luc_umask;
 213         if (uc) {
 214                 current->uid = saved->luc.luc_uid;
 215                 current->gid = saved->luc.luc_gid;
 216                 current->fsuid = saved->luc.luc_fsuid;
 217                 current->fsgid = saved->luc.luc_fsgid;
 218                 current->cap_effective = saved->luc.luc_cap;
 219
 220                 pop_group_info(saved, uc->luc_ginfo);
 221         }
 222
 223         /*
 224         CDEBUG(D_INFO,
 225                "= pop  %p->%p = cur fs %p pwd %p:d%d:i%d (%.*s), pwdmnt %p:%d\n",
 226                saved, current, current->fs, current->fs->pwd,
 227                atomic_read(&current->fs->pwd->d_count),
 228                atomic_read(&current->fs->pwd->d_inode->i_count),
 229                current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
 230                current->fs->pwdmnt,
 231                atomic_read(&current->fs->pwdmnt->mnt_count));
 232         */
 233 }
 234 EXPORT_SYMBOL(pop_ctxt);
 235
 236 /* utility to make a file */
 237 struct dentry *simple_mknod(struct dentry *dir, char *name, int mode, int fix)
 238 {
 239         struct dentry *dchild;
 240         int err = 0;
 241         ENTRY;
 242
 243         ASSERT_KERNEL_CTXT("kernel doing mknod outside kernel context\n");
 244         CDEBUG(D_INODE, "creating file %.*s\n", (int)strlen(name), name);
 245
 246         dchild = ll_lookup_one_len(name, dir, strlen(name));
 247         if (IS_ERR(dchild))
 248                 GOTO(out_up, dchild);
 249
 250         if (dchild->d_inode) {
 251                 int old_mode = dchild->d_inode->i_mode;
 252                 if (!S_ISREG(old_mode))
 253                         GOTO(out_err, err = -EEXIST);
 254
 255                 /* Fixup file permissions if necessary */
 256                 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
 257                         CWARN("fixing permissions on %s from %o to %o\n",
 258                               name, old_mode, mode);
 259                         dchild->d_inode->i_mode = (mode & S_IALLUGO) |
 260                                                   (old_mode & ~S_IALLUGO);
 261                         mark_inode_dirty(dchild->d_inode);
 262                 }
 263                 GOTO(out_up, dchild);
 264         }
 265
 266         err = ll_vfs_create(dir->d_inode, dchild, (mode & ~S_IFMT) | S_IFREG,
 267                             NULL);
 268         if (err)
 269                 GOTO(out_err, err);
 270
 271         RETURN(dchild);
 272
 273 out_err:
 274         dput(dchild);
 275         dchild = ERR_PTR(err);
 276 out_up:
 277         return dchild;
 278 }
 279 EXPORT_SYMBOL(simple_mknod);
 280
 281 /* utility to make a directory */
 282 struct dentry *simple_mkdir(struct dentry *dir, char *name, int mode, int fix)
 283 {
 284         struct dentry *dchild;
 285         int err = 0;
 286         ENTRY;
 287
 288         ASSERT_KERNEL_CTXT("kernel doing mkdir outside kernel context\n");
 289         CDEBUG(D_INODE, "creating directory %.*s\n", (int)strlen(name), name);
 290         dchild = ll_lookup_one_len(name, dir, strlen(name));
 291         if (IS_ERR(dchild))
 292                 GOTO(out_up, dchild);
 293
 294         if (dchild->d_inode) {
 295                 int old_mode = dchild->d_inode->i_mode;
 296                 if (!S_ISDIR(old_mode)) {
 297                         CERROR("found %s (%lu/%u) is mode %o\n", name,
 298                                dchild->d_inode->i_ino,
 299                                dchild->d_inode->i_generation, old_mode);
 300                         GOTO(out_err, err = -ENOTDIR);
 301                 }
 302
 303                 /* Fixup directory permissions if necessary */
 304                 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
 305                         CWARN("fixing permissions on %s from %o to %o\n",
 306                               name, old_mode, mode);
 307                         dchild->d_inode->i_mode = (mode & S_IALLUGO) |
 308                                                   (old_mode & ~S_IALLUGO);
 309                         mark_inode_dirty(dchild->d_inode);
 310                 }
 311                 GOTO(out_up, dchild);
 312         }
 313
 314         err = vfs_mkdir(dir->d_inode, dchild, mode);
 315         if (err)
 316                 GOTO(out_err, err);
 317
 318         RETURN(dchild);
 319
 320 out_err:
 321         dput(dchild);
 322         dchild = ERR_PTR(err);
 323 out_up:
 324         return dchild;
 325 }
 326 EXPORT_SYMBOL(simple_mkdir);
 327
 328 /*
 329  * Read a file from within kernel context.  Prior to calling this
 330  * function we should already have done a push_ctxt().
 331  */
 332 int lustre_fread(struct file *file, void *buf, int len, loff_t *off)
 333 {
 334         ASSERT_KERNEL_CTXT("kernel doing read outside kernel context\n");
 335         if (!file || !file->f_op || !file->f_op->read || !off)
 336                 RETURN(-ENOSYS);
 337
 338         return file->f_op->read(file, buf, len, off);
 339 }
 340 EXPORT_SYMBOL(lustre_fread);
 341
 342 /*
 343  * Write a file from within kernel context.  Prior to calling this
 344  * function we should already have done a push_ctxt().
 345  */
 346 int lustre_fwrite(struct file *file, const void *buf, int len, loff_t *off)
 347 {
 348         ENTRY;
 349         ASSERT_KERNEL_CTXT("kernel doing write outside kernel context\n");
 350         if (!file)
 351                 RETURN(-ENOENT);
 352         if (!file->f_op)
 353                 RETURN(-ENOSYS);
 354         if (!off)
 355                 RETURN(-EINVAL);
 356
 357         if (!file->f_op->write)
 358                 RETURN(-EROFS);
 359
 360         RETURN(file->f_op->write(file, buf, len, off));
 361 }
 362 EXPORT_SYMBOL(lustre_fwrite);
 363
 364 /*
 365  * Sync a file from within kernel context.  Prior to calling this
 366  * function we should already have done a push_ctxt().
 367  */
 368 int lustre_fsync(struct file *file)
 369 {
 370         ENTRY;
 371         ASSERT_KERNEL_CTXT("kernel doing sync outside kernel context\n");
 372         if (!file || !file->f_op || !file->f_op->fsync)
 373                 RETURN(-ENOSYS);
 374
 375         RETURN(file->f_op->fsync(file, file->f_dentry, 0));
 376 }
 377 EXPORT_SYMBOL(lustre_fsync);
 378
 379 struct l_file *l_dentry_open(struct lvfs_run_ctxt *ctxt, struct l_dentry *de,
 380                              int flags)
 381 {
 382         mntget(ctxt->pwdmnt);
 383         return dentry_open(de, ctxt->pwdmnt, flags);
 384 }
 385 EXPORT_SYMBOL(l_dentry_open);
 386
 387 static int l_filldir(void *__buf, const char *name, int namlen, loff_t offset,
 388                      ino_t ino, unsigned int d_type)
 389 {
 390         struct l_linux_dirent *dirent;
 391         struct l_readdir_callback *buf = (struct l_readdir_callback *)__buf;
 392
 393         dirent = buf->lrc_dirent;
 394         if (dirent)
 395                dirent->lld_off = offset;
 396
 397         OBD_ALLOC(dirent, sizeof(*dirent));
 398
 399         list_add_tail(&dirent->lld_list, buf->lrc_list);
 400
 401         buf->lrc_dirent = dirent;
 402         dirent->lld_ino = ino;
 403         LASSERT(sizeof(dirent->lld_name) >= namlen + 1);
 404         memcpy(dirent->lld_name, name, namlen);
 405
 406         return 0;
 407 }
 408
 409 long l_readdir(struct file *file, struct list_head *dentry_list)
 410 {
 411         struct l_linux_dirent *lastdirent;
 412         struct l_readdir_callback buf;
 413         int error;
 414
 415         buf.lrc_dirent = NULL;
 416         buf.lrc_list = dentry_list;
 417
 418         error = vfs_readdir(file, l_filldir, &buf);
 419         if (error < 0)
 420                 return error;
 421
 422         lastdirent = buf.lrc_dirent;
 423         if (lastdirent)
 424                 lastdirent->lld_off = file->f_pos;
 425
 426         return 0;
 427 }
 428 EXPORT_SYMBOL(l_readdir);
 429 EXPORT_SYMBOL(obd_memory);
 430 EXPORT_SYMBOL(obd_memmax);
 431
 432 #if defined (CONFIG_DEBUG_MEMORY) && defined(__KERNEL__)
 433 static spinlock_t obd_memlist_lock = SPIN_LOCK_UNLOCKED;
 434 static struct hlist_head *obd_memtable;
 435 static unsigned long obd_memtable_size;
 436
 437 static int lvfs_memdbg_init(int size)
 438 {
 439         struct hlist_head *head;
 440         int i;
 441
 442         LASSERT(size > sizeof(sizeof(struct hlist_head)));
 443         obd_memtable_size = size / sizeof(struct hlist_head);
 444
 445         CWARN("allocating %lu malloc entries...\n",
 446               (unsigned long)obd_memtable_size);
 447
 448         obd_memtable = kmalloc(size, GFP_KERNEL);
 449         if (!obd_memtable)
 450                 return -ENOMEM;
 451
 452         i = obd_memtable_size;
 453         head = obd_memtable;
 454         do {
 455                 INIT_HLIST_HEAD(head);
 456                 head++;
 457                 i--;
 458         } while(i);
 459
 460         return 0;
 461 }
 462
 463 static int lvfs_memdbg_cleanup(void)
 464 {
 465         struct hlist_node *node = NULL, *tmp = NULL;
 466         struct hlist_head *head;
 467         struct mem_track *mt;
 468         int i;
 469
 470         spin_lock(&obd_memlist_lock);
 471         for (i = 0, head = obd_memtable; i < obd_memtable_size; i++, head++) {
 472                 hlist_for_each_safe(node, tmp, head) {
 473                         mt = hlist_entry(node, struct mem_track, m_hash);
 474                         hlist_del_init(&mt->m_hash);
 475                         kfree(mt);
 476                 }
 477         }
 478         spin_unlock(&obd_memlist_lock);
 479         kfree(obd_memtable);
 480         return 0;
 481 }
 482
 483 static inline unsigned long const hashfn(void *ptr)
 484 {
 485         return (unsigned long)ptr &
 486                 (obd_memtable_size - 1);
 487 }
 488
 489 static void __lvfs_memdbg_insert(struct mem_track *mt)
 490 {
 491         struct hlist_head *head = obd_memtable +
 492                 hashfn(mt->m_ptr);
 493         hlist_add_head(&mt->m_hash, head);
 494 }
 495
 496 void lvfs_memdbg_insert(struct mem_track *mt)
 497 {
 498         spin_lock(&obd_memlist_lock);
 499         __lvfs_memdbg_insert(mt);
 500         spin_unlock(&obd_memlist_lock);
 501 }
 502 EXPORT_SYMBOL(lvfs_memdbg_insert);
 503
 504 static void __lvfs_memdbg_remove(struct mem_track *mt)
 505 {
 506         hlist_del_init(&mt->m_hash);
 507 }
 508
 509 void lvfs_memdbg_remove(struct mem_track *mt)
 510 {
 511         spin_lock(&obd_memlist_lock);
 512         __lvfs_memdbg_remove(mt);
 513         spin_unlock(&obd_memlist_lock);
 514 }
 515 EXPORT_SYMBOL(lvfs_memdbg_remove);
 516
 517 static struct mem_track *__lvfs_memdbg_find(void *ptr)
 518 {
 519         struct hlist_node *node = NULL;
 520         struct mem_track *mt = NULL;
 521         struct hlist_head *head;
 522
 523         head = obd_memtable + hashfn(ptr);
 524
 525         hlist_for_each(node, head) {
 526                 mt = hlist_entry(node, struct mem_track, m_hash);
 527                 if ((unsigned long)mt->m_ptr == (unsigned long)ptr)
 528                         break;
 529                 mt = NULL;
 530         }
 531         return mt;
 532 }
 533
 534 struct mem_track *lvfs_memdbg_find(void *ptr)
 535 {
 536         struct mem_track *mt;
 537
 538         spin_lock(&obd_memlist_lock);
 539         mt = __lvfs_memdbg_find(ptr);
 540         spin_unlock(&obd_memlist_lock);
 541
 542         return mt;
 543 }
 544 EXPORT_SYMBOL(lvfs_memdbg_find);
 545
 546 int lvfs_memdbg_check_insert(struct mem_track *mt)
 547 {
 548         spin_lock(&obd_memlist_lock);
 549         if (!__lvfs_memdbg_find(mt->m_ptr)) {
 550                 __lvfs_memdbg_insert(mt);
 551                 spin_unlock(&obd_memlist_lock);
 552                 return 1;
 553         }
 554         spin_unlock(&obd_memlist_lock);
 555         return 0;
 556 }
 557 EXPORT_SYMBOL(lvfs_memdbg_check_insert);
 558
 559 struct mem_track *
 560 lvfs_memdbg_check_remove(void *ptr)
 561 {
 562         struct mem_track *mt;
 563
 564         spin_lock(&obd_memlist_lock);
 565         mt = __lvfs_memdbg_find(ptr);
 566         if (mt) {
 567                 __lvfs_memdbg_remove(mt);
 568                 spin_unlock(&obd_memlist_lock);
 569                 return mt;
 570         }
 571         spin_unlock(&obd_memlist_lock);
 572         return NULL;
 573 }
 574 EXPORT_SYMBOL(lvfs_memdbg_check_remove);
 575 #endif
 576
 577 void lvfs_memdbg_show(void)
 578 {
 579 #if defined (CONFIG_DEBUG_MEMORY) && defined(__KERNEL__)
 580         struct hlist_node *node = NULL;
 581         struct hlist_head *head;
 582         struct mem_track *mt;
 583 #endif
 584         int leaked;
 585
 586 #if defined (CONFIG_DEBUG_MEMORY) && defined(__KERNEL__)
 587         int i;
 588 #endif
 589
 590         leaked = atomic_read(&obd_memory);
 591
 592         if (leaked > 0) {
 593                 CWARN("memory leaks detected (max %d, leaked %d)\n",
 594                       obd_memmax, leaked);
 595
 596 #if defined (CONFIG_DEBUG_MEMORY) && defined(__KERNEL__)
 597                 spin_lock(&obd_memlist_lock);
 598                 for (i = 0, head = obd_memtable; i < obd_memtable_size; i++, head++) {
 599                         hlist_for_each(node, head) {
 600                                 mt = hlist_entry(node, struct mem_track, m_hash);
 601                                 CWARN("  ptr: 0x%p, size: %d, src at \"%s\"\n",
 602                                       mt->m_ptr, mt->m_size, mt->m_loc);
 603                         }
 604                 }
 605                 spin_unlock(&obd_memlist_lock);
 606 #endif
 607                 /* remove for production */
 608                 portals_debug_dumplog();
 609         }
 610 }
 611 EXPORT_SYMBOL(lvfs_memdbg_show);
 612
 613 static int __init lvfs_linux_init(void)
 614 {
 615         ENTRY;
 616 #if defined (CONFIG_DEBUG_MEMORY) && defined(__KERNEL__)
 617         lvfs_memdbg_init(PAGE_SIZE);
 618 #endif
 619         lvfs_mount_list_init();
 620         RETURN(0);
 621 }
 622
 623 static void __exit lvfs_linux_exit(void)
 624 {
 625         ENTRY;
 626
 627         lvfs_mount_list_cleanup();
 628         lvfs_memdbg_show();
 629
 630 #if defined (CONFIG_DEBUG_MEMORY) && defined(__KERNEL__)
 631         lvfs_memdbg_cleanup();
 632 #endif
 633         EXIT;
 634         return;
 635 }
 636
 637 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 638 MODULE_DESCRIPTION("Lustre VFS Filesystem Helper v0.1");
 639 MODULE_LICENSE("GPL");
 640
 641 module_init(lvfs_linux_init);
 642 module_exit(lvfs_linux_exit);