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_fsuid = current->fsuid;
 152                 save->luc.luc_fsgid = current->fsgid;
 153                 save->luc.luc_cap = current->cap_effective;
 154
 155                 current->fsuid = uc->luc_fsuid;
 156                 current->fsgid = uc->luc_fsgid;
 157                 current->cap_effective = uc->luc_cap;
 158
 159                 push_group_info(save, uc->luc_ginfo);
 160         }
 161         current->fs->umask = 0; /* umask already applied on client */
 162         set_fs(new_ctx->fs);
 163         set_fs_pwd(current->fs, new_ctx->pwdmnt, new_ctx->pwd);
 164
 165         /*
 166         CDEBUG(D_INFO,
 167                "= push %p->%p = cur fs %p pwd %p:d%d:i%d (%.*s), pwdmnt %p:%d\n",
 168                new_ctx, current, current->fs, current->fs->pwd,
 169                atomic_read(&current->fs->pwd->d_count),
 170                atomic_read(&current->fs->pwd->d_inode->i_count),
 171                current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
 172                current->fs->pwdmnt,
 173                atomic_read(&current->fs->pwdmnt->mnt_count));
 174         */
 175 }
 176 EXPORT_SYMBOL(push_ctxt);
 177
 178 void pop_ctxt(struct lvfs_run_ctxt *saved, struct lvfs_run_ctxt *new_ctx,
 179               struct lvfs_ucred *uc)
 180 {
 181         //printk("pc0");
 182         ASSERT_CTXT_MAGIC(saved->magic);
 183         LASSERT(saved->pid == current->pid);
 184         saved->magic = 0;
 185         saved->pid = 0;
 186         //printk("pc1");
 187         ASSERT_KERNEL_CTXT("popping non-kernel context!\n");
 188
 189         /*
 190         CDEBUG(D_INFO,
 191                " = pop  %p==%p = cur %p pwd %p:d%d:i%d (%.*s), pwdmnt %p:%d\n",
 192                new_ctx, current, current->fs, current->fs->pwd,
 193                atomic_read(&current->fs->pwd->d_count),
 194                atomic_read(&current->fs->pwd->d_inode->i_count),
 195                current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
 196                current->fs->pwdmnt,
 197                atomic_read(&current->fs->pwdmnt->mnt_count));
 198         */
 199
 200         LASSERT(current->fs->pwd == new_ctx->pwd);
 201         LASSERT(current->fs->pwdmnt == new_ctx->pwdmnt);
 202
 203         set_fs(saved->fs);
 204         set_fs_pwd(current->fs, saved->pwdmnt, saved->pwd);
 205
 206         dput(saved->pwd);
 207         mntput(saved->pwdmnt);
 208         current->fs->umask = saved->luc.luc_umask;
 209         if (uc) {
 210                 current->fsuid = saved->luc.luc_fsuid;
 211                 current->fsgid = saved->luc.luc_fsgid;
 212                 current->cap_effective = saved->luc.luc_cap;
 213
 214                 pop_group_info(saved, uc->luc_ginfo);
 215         }
 216
 217         /*
 218         CDEBUG(D_INFO,
 219                "= pop  %p->%p = cur fs %p pwd %p:d%d:i%d (%.*s), pwdmnt %p:%d\n",
 220                saved, current, current->fs, current->fs->pwd,
 221                atomic_read(&current->fs->pwd->d_count),
 222                atomic_read(&current->fs->pwd->d_inode->i_count),
 223                current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
 224                current->fs->pwdmnt,
 225                atomic_read(&current->fs->pwdmnt->mnt_count));
 226         */
 227 }
 228 EXPORT_SYMBOL(pop_ctxt);
 229
 230 /* utility to make a file */
 231 struct dentry *simple_mknod(struct dentry *dir, char *name, int mode, int fix)
 232 {
 233         struct dentry *dchild;
 234         int err = 0;
 235         ENTRY;
 236
 237         ASSERT_KERNEL_CTXT("kernel doing mknod outside kernel context\n");
 238         CDEBUG(D_INODE, "creating file %.*s\n", (int)strlen(name), name);
 239
 240         dchild = ll_lookup_one_len(name, dir, strlen(name));
 241         if (IS_ERR(dchild))
 242                 GOTO(out_up, dchild);
 243
 244         if (dchild->d_inode) {
 245                 int old_mode = dchild->d_inode->i_mode;
 246                 if (!S_ISREG(old_mode))
 247                         GOTO(out_err, err = -EEXIST);
 248
 249                 /* Fixup file permissions if necessary */
 250                 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
 251                         CWARN("fixing permissions on %s from %o to %o\n",
 252                               name, old_mode, mode);
 253                         dchild->d_inode->i_mode = (mode & S_IALLUGO) |
 254                                                   (old_mode & ~S_IALLUGO);
 255                         mark_inode_dirty(dchild->d_inode);
 256                 }
 257                 GOTO(out_up, dchild);
 258         }
 259
 260         err = ll_vfs_create(dir->d_inode, dchild, (mode & ~S_IFMT) | S_IFREG,
 261                             NULL);
 262         if (err)
 263                 GOTO(out_err, err);
 264
 265         RETURN(dchild);
 266
 267 out_err:
 268         dput(dchild);
 269         dchild = ERR_PTR(err);
 270 out_up:
 271         return dchild;
 272 }
 273 EXPORT_SYMBOL(simple_mknod);
 274
 275 /* utility to make a directory */
 276 struct dentry *simple_mkdir(struct dentry *dir, char *name, int mode, int fix)
 277 {
 278         struct dentry *dchild;
 279         int err = 0;
 280         ENTRY;
 281
 282         ASSERT_KERNEL_CTXT("kernel doing mkdir outside kernel context\n");
 283         CDEBUG(D_INODE, "creating directory %.*s\n", (int)strlen(name), name);
 284         dchild = ll_lookup_one_len(name, dir, strlen(name));
 285         if (IS_ERR(dchild))
 286                 GOTO(out_up, dchild);
 287
 288         if (dchild->d_inode) {
 289                 int old_mode = dchild->d_inode->i_mode;
 290                 if (!S_ISDIR(old_mode)) {
 291                         CERROR("found %s (%lu/%u) is mode %o\n", name,
 292                                dchild->d_inode->i_ino,
 293                                dchild->d_inode->i_generation, old_mode);
 294                         GOTO(out_err, err = -ENOTDIR);
 295                 }
 296
 297                 /* Fixup directory permissions if necessary */
 298                 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
 299                         CWARN("fixing permissions on %s from %o to %o\n",
 300                               name, old_mode, mode);
 301                         dchild->d_inode->i_mode = (mode & S_IALLUGO) |
 302                                                   (old_mode & ~S_IALLUGO);
 303                         mark_inode_dirty(dchild->d_inode);
 304                 }
 305                 GOTO(out_up, dchild);
 306         }
 307
 308         err = vfs_mkdir(dir->d_inode, dchild, mode);
 309         if (err)
 310                 GOTO(out_err, err);
 311
 312         RETURN(dchild);
 313
 314 out_err:
 315         dput(dchild);
 316         dchild = ERR_PTR(err);
 317 out_up:
 318         return dchild;
 319 }
 320 EXPORT_SYMBOL(simple_mkdir);
 321
 322 /*
 323  * Read a file from within kernel context.  Prior to calling this
 324  * function we should already have done a push_ctxt().
 325  */
 326 int lustre_fread(struct file *file, void *buf, int len, loff_t *off)
 327 {
 328         ASSERT_KERNEL_CTXT("kernel doing read outside kernel context\n");
 329         if (!file || !file->f_op || !file->f_op->read || !off)
 330                 RETURN(-ENOSYS);
 331
 332         return file->f_op->read(file, buf, len, off);
 333 }
 334 EXPORT_SYMBOL(lustre_fread);
 335
 336 /*
 337  * Write a file from within kernel context.  Prior to calling this
 338  * function we should already have done a push_ctxt().
 339  */
 340 int lustre_fwrite(struct file *file, const void *buf, int len, loff_t *off)
 341 {
 342         ENTRY;
 343         ASSERT_KERNEL_CTXT("kernel doing write outside kernel context\n");
 344         if (!file)
 345                 RETURN(-ENOENT);
 346         if (!file->f_op)
 347                 RETURN(-ENOSYS);
 348         if (!off)
 349                 RETURN(-EINVAL);
 350
 351         if (!file->f_op->write)
 352                 RETURN(-EROFS);
 353
 354         RETURN(file->f_op->write(file, buf, len, off));
 355 }
 356 EXPORT_SYMBOL(lustre_fwrite);
 357
 358 /*
 359  * Sync a file from within kernel context.  Prior to calling this
 360  * function we should already have done a push_ctxt().
 361  */
 362 int lustre_fsync(struct file *file)
 363 {
 364         ENTRY;
 365         ASSERT_KERNEL_CTXT("kernel doing sync outside kernel context\n");
 366         if (!file || !file->f_op || !file->f_op->fsync)
 367                 RETURN(-ENOSYS);
 368
 369         RETURN(file->f_op->fsync(file, file->f_dentry, 0));
 370 }
 371 EXPORT_SYMBOL(lustre_fsync);
 372
 373 struct l_file *l_dentry_open(struct lvfs_run_ctxt *ctxt, struct l_dentry *de,
 374                              int flags)
 375 {
 376         mntget(ctxt->pwdmnt);
 377         return dentry_open(de, ctxt->pwdmnt, flags);
 378 }
 379 EXPORT_SYMBOL(l_dentry_open);
 380
 381 static int l_filldir(void *__buf, const char *name, int namlen, loff_t offset,
 382                      ino_t ino, unsigned int d_type)
 383 {
 384         struct l_linux_dirent *dirent;
 385         struct l_readdir_callback *buf = (struct l_readdir_callback *)__buf;
 386
 387         dirent = buf->lrc_dirent;
 388         if (dirent)
 389                dirent->lld_off = offset;
 390
 391         OBD_ALLOC(dirent, sizeof(*dirent));
 392
 393         list_add_tail(&dirent->lld_list, buf->lrc_list);
 394
 395         buf->lrc_dirent = dirent;
 396         dirent->lld_ino = ino;
 397         LASSERT(sizeof(dirent->lld_name) >= namlen + 1);
 398         memcpy(dirent->lld_name, name, namlen);
 399
 400         return 0;
 401 }
 402
 403 long l_readdir(struct file *file, struct list_head *dentry_list)
 404 {
 405         struct l_linux_dirent *lastdirent;
 406         struct l_readdir_callback buf;
 407         int error;
 408
 409         buf.lrc_dirent = NULL;
 410         buf.lrc_list = dentry_list;
 411
 412         error = vfs_readdir(file, l_filldir, &buf);
 413         if (error < 0)
 414                 return error;
 415
 416         lastdirent = buf.lrc_dirent;
 417         if (lastdirent)
 418                 lastdirent->lld_off = file->f_pos;
 419
 420         return 0;
 421 }
 422 EXPORT_SYMBOL(l_readdir);
 423 EXPORT_SYMBOL(obd_memory);
 424 EXPORT_SYMBOL(obd_memmax);
 425
 426 #if defined (CONFIG_DEBUG_MEMORY) && defined(__KERNEL__)
 427 static spinlock_t obd_memlist_lock = SPIN_LOCK_UNLOCKED;
 428 static struct hlist_head *obd_memtable;
 429 static unsigned long obd_memtable_size;
 430
 431 static int lvfs_memdbg_init(int size)
 432 {
 433         struct hlist_head *head;
 434         int i;
 435
 436         LASSERT(size > sizeof(sizeof(struct hlist_head)));
 437         obd_memtable_size = size / sizeof(struct hlist_head);
 438
 439         CWARN("Allocating %lu malloc entries...\n",
 440               (unsigned long)obd_memtable_size);
 441
 442         obd_memtable = kmalloc(size, GFP_KERNEL);
 443         if (!obd_memtable)
 444                 return -ENOMEM;
 445
 446         i = obd_memtable_size;
 447         head = obd_memtable;
 448         do {
 449                 INIT_HLIST_HEAD(head);
 450                 head++;
 451                 i--;
 452         } while(i);
 453
 454         return 0;
 455 }
 456
 457 static int lvfs_memdbg_cleanup(void)
 458 {
 459         struct hlist_node *node = NULL, *tmp = NULL;
 460         struct hlist_head *head;
 461         struct mtrack *mt;
 462         int i;
 463
 464         spin_lock(&obd_memlist_lock);
 465         for (i = 0, head = obd_memtable; i < obd_memtable_size; i++, head++) {
 466                 hlist_for_each_safe(node, tmp, head) {
 467                         mt = hlist_entry(node, struct mtrack, m_hash);
 468                         hlist_del_init(&mt->m_hash);
 469                         kfree(mt);
 470                 }
 471         }
 472         spin_unlock(&obd_memlist_lock);
 473         kfree(obd_memtable);
 474         return 0;
 475 }
 476
 477 static inline unsigned long const hashfn(void *ptr)
 478 {
 479         return (unsigned long)ptr &
 480                 (obd_memtable_size - 1);
 481 }
 482
 483 static void __lvfs_memdbg_insert(struct mtrack *mt)
 484 {
 485         struct hlist_head *head = obd_memtable +
 486                 hashfn(mt->m_ptr);
 487         hlist_add_head(&mt->m_hash, head);
 488 }
 489
 490 void lvfs_memdbg_insert(struct mtrack *mt)
 491 {
 492         spin_lock(&obd_memlist_lock);
 493         __lvfs_memdbg_insert(mt);
 494         spin_unlock(&obd_memlist_lock);
 495 }
 496 EXPORT_SYMBOL(lvfs_memdbg_insert);
 497
 498 static void __lvfs_memdbg_remove(struct mtrack *mt)
 499 {
 500         hlist_del_init(&mt->m_hash);
 501 }
 502
 503 void lvfs_memdbg_remove(struct mtrack *mt)
 504 {
 505         spin_lock(&obd_memlist_lock);
 506         __lvfs_memdbg_remove(mt);
 507         spin_unlock(&obd_memlist_lock);
 508 }
 509 EXPORT_SYMBOL(lvfs_memdbg_remove);
 510
 511 static struct mtrack *__lvfs_memdbg_find(void *ptr)
 512 {
 513         struct hlist_node *node = NULL;
 514         struct mtrack *mt = NULL;
 515         struct hlist_head *head;
 516
 517         head = obd_memtable + hashfn(ptr);
 518
 519         hlist_for_each(node, head) {
 520                 mt = hlist_entry(node, struct mtrack, m_hash);
 521                 if ((unsigned long)mt->m_ptr == (unsigned long)ptr)
 522                         break;
 523                 mt = NULL;
 524         }
 525         return mt;
 526 }
 527
 528 struct mtrack *lvfs_memdbg_find(void *ptr)
 529 {
 530         struct mtrack *mt;
 531
 532         spin_lock(&obd_memlist_lock);
 533         mt = __lvfs_memdbg_find(ptr);
 534         spin_unlock(&obd_memlist_lock);
 535
 536         return mt;
 537 }
 538 EXPORT_SYMBOL(lvfs_memdbg_find);
 539
 540 int lvfs_memdbg_check_insert(struct mtrack *mt)
 541 {
 542         spin_lock(&obd_memlist_lock);
 543         if (!__lvfs_memdbg_find(mt->m_ptr)) {
 544                 __lvfs_memdbg_insert(mt);
 545                 spin_unlock(&obd_memlist_lock);
 546                 return 1;
 547         }
 548         spin_unlock(&obd_memlist_lock);
 549         return 0;
 550 }
 551 EXPORT_SYMBOL(lvfs_memdbg_check_insert);
 552
 553 struct mtrack *
 554 lvfs_memdbg_check_remove(void *ptr)
 555 {
 556         struct mtrack *mt;
 557
 558         spin_lock(&obd_memlist_lock);
 559         mt = __lvfs_memdbg_find(ptr);
 560         if (mt) {
 561                 __lvfs_memdbg_remove(mt);
 562                 spin_unlock(&obd_memlist_lock);
 563                 return mt;
 564         }
 565         spin_unlock(&obd_memlist_lock);
 566         return NULL;
 567 }
 568 EXPORT_SYMBOL(lvfs_memdbg_check_remove);
 569
 570 static void lvfs_memdbg_show(void)
 571 {
 572         struct hlist_node *node = NULL;
 573         struct hlist_head *head;
 574         struct mtrack *mt;
 575         int leaked, i;
 576
 577         leaked = atomic_read(&obd_memory);
 578
 579         if (leaked > 0) {
 580                 CWARN("Memory leaks detected (max %d, leaked %d):\n",
 581                       obd_memmax, leaked);
 582
 583                 spin_lock(&obd_memlist_lock);
 584                 for (i = 0, head = obd_memtable; i < obd_memtable_size; i++, head++) {
 585                         hlist_for_each(node, head) {
 586                                 mt = hlist_entry(node, struct mtrack, m_hash);
 587                                 CWARN("  ptr: 0x%p, size: %d, src at \"%s\"\n",
 588                                       mt->m_ptr, mt->m_size, mt->m_loc);
 589                         }
 590                 }
 591                 spin_unlock(&obd_memlist_lock);
 592         }
 593 }
 594 #endif
 595
 596 static int __init lvfs_linux_init(void)
 597 {
 598         ENTRY;
 599 #if defined (CONFIG_DEBUG_MEMORY) && defined(__KERNEL__)
 600         lvfs_memdbg_init(PAGE_SIZE);
 601 #endif
 602         lvfs_mount_list_init();
 603         RETURN(0);
 604 }
 605
 606 static void __exit lvfs_linux_exit(void)
 607 {
 608         ENTRY;
 609
 610         lvfs_mount_list_cleanup();
 611
 612 #if defined (CONFIG_DEBUG_MEMORY) && defined(__KERNEL__)
 613         lvfs_memdbg_show();
 614         lvfs_memdbg_cleanup();
 615 #endif
 616         EXIT;
 617         return;
 618 }
 619
 620 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 621 MODULE_DESCRIPTION("Lustre VFS Filesystem Helper v0.1");
 622 MODULE_LICENSE("GPL");
 623
 624 module_init(lvfs_linux_init);
 625 module_exit(lvfs_linux_exit);