lustre/lvfs/lvfs_linux.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/lvfs/lvfs_linux.c
  37  *
  38  * Author: Andreas Dilger <adilger@clusterfs.com>
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_FILTER
  42
  43 #include <linux/version.h>
  44 #include <linux/fs.h>
  45 #include <asm/unistd.h>
  46 #include <linux/slab.h>
  47 #include <linux/pagemap.h>
  48 #include <linux/quotaops.h>
  49 #include <linux/version.h>
  50 #include <libcfs/libcfs.h>
  51 #include <lustre_fsfilt.h>
  52 #include <obd.h>
  53 #include <linux/module.h>
  54 #include <linux/init.h>
  55 #include <linux/lustre_compat25.h>
  56 #include <lvfs.h>
  57
  58 #include <obd.h>
  59 #include <lustre_lib.h>
  60
  61 __u64 obd_max_pages = 0;
  62 __u64 obd_max_alloc = 0;
  63 struct lprocfs_stats *obd_memory = NULL;
  64 EXPORT_SYMBOL(obd_memory);
  65 DEFINE_SPINLOCK(obd_updatemax_lock);
  66 /* refine later and change to seqlock or simlar from libcfs */
  67
  68 /* Debugging check only needed during development */
  69 #ifdef OBD_CTXT_DEBUG
  70 # define ASSERT_CTXT_MAGIC(magic) LASSERT((magic) == OBD_RUN_CTXT_MAGIC)
  71 # define ASSERT_NOT_KERNEL_CTXT(msg) LASSERTF(!segment_eq(get_fs(), get_ds()),\
  72                                               msg)
  73 # define ASSERT_KERNEL_CTXT(msg) LASSERTF(segment_eq(get_fs(), get_ds()), msg)
  74 #else
  75 # define ASSERT_CTXT_MAGIC(magic) do {} while(0)
  76 # define ASSERT_NOT_KERNEL_CTXT(msg) do {} while(0)
  77 # define ASSERT_KERNEL_CTXT(msg) do {} while(0)
  78 #endif
  79
  80 static void push_group_info(struct lvfs_run_ctxt *save,
  81                             struct group_info *ginfo)
  82 {
  83         if (!ginfo) {
  84                 save->ngroups = current_ngroups;
  85                 current_ngroups = 0;
  86         } else {
  87                 struct cred *cred;
  88                 task_lock(current);
  89                 save->group_info = current_cred()->group_info;
  90                 if ((cred = prepare_creds())) {
  91                         cred->group_info = ginfo;
  92                         commit_creds(cred);
  93                 }
  94                 task_unlock(current);
  95         }
  96 }
  97
  98 static void pop_group_info(struct lvfs_run_ctxt *save,
  99                            struct group_info *ginfo)
 100 {
 101         if (!ginfo) {
 102                 current_ngroups = save->ngroups;
 103         } else {
 104                 struct cred *cred;
 105                 task_lock(current);
 106                 if ((cred = prepare_creds())) {
 107                         cred->group_info = save->group_info;
 108                         commit_creds(cred);
 109                 }
 110                 task_unlock(current);
 111         }
 112 }
 113
 114 /* push / pop to root of obd store */
 115 void push_ctxt(struct lvfs_run_ctxt *save, struct lvfs_run_ctxt *new_ctx,
 116                struct lvfs_ucred *uc)
 117 {
 118         /* if there is underlaying dt_device then push_ctxt is not needed */
 119         if (new_ctx->dt != NULL)
 120                 return;
 121
 122         //ASSERT_NOT_KERNEL_CTXT("already in kernel context!\n");
 123         ASSERT_CTXT_MAGIC(new_ctx->magic);
 124         OBD_SET_CTXT_MAGIC(save);
 125
 126         save->fs = get_fs();
 127         LASSERT(d_refcount(cfs_fs_pwd(current->fs)));
 128         LASSERT(d_refcount(new_ctx->pwd));
 129         save->pwd = dget(cfs_fs_pwd(current->fs));
 130         save->pwdmnt = mntget(cfs_fs_mnt(current->fs));
 131         save->luc.luc_umask = cfs_curproc_umask();
 132         save->ngroups = current_cred()->group_info->ngroups;
 133
 134         LASSERT(save->pwd);
 135         LASSERT(save->pwdmnt);
 136         LASSERT(new_ctx->pwd);
 137         LASSERT(new_ctx->pwdmnt);
 138
 139         if (uc) {
 140                 struct cred *cred;
 141                 save->luc.luc_uid = current_uid();
 142                 save->luc.luc_gid = current_gid();
 143                 save->luc.luc_fsuid = current_fsuid();
 144                 save->luc.luc_fsgid = current_fsgid();
 145                 save->luc.luc_cap = current_cap();
 146
 147                 if ((cred = prepare_creds())) {
 148                         cred->uid = uc->luc_uid;
 149                         cred->gid = uc->luc_gid;
 150                         cred->fsuid = uc->luc_fsuid;
 151                         cred->fsgid = uc->luc_fsgid;
 152                         cred->cap_effective = uc->luc_cap;
 153                         commit_creds(cred);
 154                 }
 155
 156                 push_group_info(save,
 157                                 uc->luc_ginfo ?:
 158                                 uc->luc_identity ? uc->luc_identity->mi_ginfo :
 159                                                    NULL);
 160         }
 161         current->fs->umask = 0; /* umask already applied on client */
 162         set_fs(new_ctx->fs);
 163         ll_set_fs_pwd(current->fs, new_ctx->pwdmnt, new_ctx->pwd);
 164 }
 165 EXPORT_SYMBOL(push_ctxt);
 166
 167 void pop_ctxt(struct lvfs_run_ctxt *saved, struct lvfs_run_ctxt *new_ctx,
 168               struct lvfs_ucred *uc)
 169 {
 170         /* if there is underlaying dt_device then pop_ctxt is not needed */
 171         if (new_ctx->dt != NULL)
 172                 return;
 173
 174         ASSERT_CTXT_MAGIC(saved->magic);
 175         ASSERT_KERNEL_CTXT("popping non-kernel context!\n");
 176
 177         LASSERTF(cfs_fs_pwd(current->fs) == new_ctx->pwd, "%p != %p\n",
 178                  cfs_fs_pwd(current->fs), new_ctx->pwd);
 179         LASSERTF(cfs_fs_mnt(current->fs) == new_ctx->pwdmnt, "%p != %p\n",
 180                  cfs_fs_mnt(current->fs), new_ctx->pwdmnt);
 181
 182         set_fs(saved->fs);
 183         ll_set_fs_pwd(current->fs, saved->pwdmnt, saved->pwd);
 184
 185         dput(saved->pwd);
 186         mntput(saved->pwdmnt);
 187         current->fs->umask = saved->luc.luc_umask;
 188         if (uc) {
 189                 struct cred *cred;
 190                 if ((cred = prepare_creds())) {
 191                         cred->uid = saved->luc.luc_uid;
 192                         cred->gid = saved->luc.luc_gid;
 193                         cred->fsuid = saved->luc.luc_fsuid;
 194                         cred->fsgid = saved->luc.luc_fsgid;
 195                         cred->cap_effective = saved->luc.luc_cap;
 196                         commit_creds(cred);
 197                 }
 198
 199                 pop_group_info(saved,
 200                                uc->luc_ginfo ?:
 201                                uc->luc_identity ? uc->luc_identity->mi_ginfo :
 202                                                   NULL);
 203         }
 204 }
 205 EXPORT_SYMBOL(pop_ctxt);
 206
 207 /* utility to make a file */
 208 struct dentry *simple_mknod(struct dentry *dir, char *name, int mode, int fix)
 209 {
 210         struct dentry *dchild;
 211         int err = 0;
 212         ENTRY;
 213
 214         // ASSERT_KERNEL_CTXT("kernel doing mknod outside kernel context\n");
 215         CDEBUG(D_INODE, "creating file %.*s\n", (int)strlen(name), name);
 216
 217         dchild = ll_lookup_one_len(name, dir, strlen(name));
 218         if (IS_ERR(dchild))
 219                 GOTO(out_up, dchild);
 220
 221         if (dchild->d_inode) {
 222                 int old_mode = dchild->d_inode->i_mode;
 223                 if (!S_ISREG(old_mode))
 224                         GOTO(out_err, err = -EEXIST);
 225
 226                 /* Fixup file permissions if necessary */
 227                 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
 228                         CWARN("fixing permissions on %s from %o to %o\n",
 229                               name, old_mode, mode);
 230                         dchild->d_inode->i_mode = (mode & S_IALLUGO) |
 231                                                   (old_mode & ~S_IALLUGO);
 232                         mark_inode_dirty(dchild->d_inode);
 233                 }
 234                 GOTO(out_up, dchild);
 235         }
 236
 237         err = vfs_create(dir->d_inode, dchild, (mode & ~S_IFMT) | S_IFREG,
 238                             NULL);
 239         if (err)
 240                 GOTO(out_err, err);
 241
 242         RETURN(dchild);
 243
 244 out_err:
 245         dput(dchild);
 246         dchild = ERR_PTR(err);
 247 out_up:
 248         return dchild;
 249 }
 250 EXPORT_SYMBOL(simple_mknod);
 251
 252 /* utility to make a directory */
 253 struct dentry *simple_mkdir(struct dentry *dir, struct vfsmount *mnt,
 254                             const char *name, int mode, int fix)
 255 {
 256         struct dentry *dchild;
 257         int err = 0;
 258         ENTRY;
 259
 260         // ASSERT_KERNEL_CTXT("kernel doing mkdir outside kernel context\n");
 261         CDEBUG(D_INODE, "creating directory %.*s\n", (int)strlen(name), name);
 262         dchild = ll_lookup_one_len(name, dir, strlen(name));
 263         if (IS_ERR(dchild))
 264                 GOTO(out_up, dchild);
 265
 266         if (dchild->d_inode) {
 267                 int old_mode = dchild->d_inode->i_mode;
 268                 if (!S_ISDIR(old_mode)) {
 269                         CERROR("found %s (%lu/%u) is mode %o\n", name,
 270                                dchild->d_inode->i_ino,
 271                                dchild->d_inode->i_generation, old_mode);
 272                         GOTO(out_err, err = -ENOTDIR);
 273                 }
 274
 275                 /* Fixup directory permissions if necessary */
 276                 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
 277                         CDEBUG(D_CONFIG,
 278                                "fixing permissions on %s from %o to %o\n",
 279                                name, old_mode, mode);
 280                         dchild->d_inode->i_mode = (mode & S_IALLUGO) |
 281                                                   (old_mode & ~S_IALLUGO);
 282                         mark_inode_dirty(dchild->d_inode);
 283                 }
 284                 GOTO(out_up, dchild);
 285         }
 286
 287         err = ll_vfs_mkdir(dir->d_inode, dchild, mnt, mode);
 288         if (err)
 289                 GOTO(out_err, err);
 290
 291         RETURN(dchild);
 292
 293 out_err:
 294         dput(dchild);
 295         dchild = ERR_PTR(err);
 296 out_up:
 297         return dchild;
 298 }
 299 EXPORT_SYMBOL(simple_mkdir);
 300
 301 /* utility to rename a file */
 302 int lustre_rename(struct dentry *dir, struct vfsmount *mnt,
 303                   char *oldname, char *newname)
 304 {
 305         struct dentry *dchild_old, *dchild_new;
 306         int err = 0;
 307         ENTRY;
 308
 309         ASSERT_KERNEL_CTXT("kernel doing rename outside kernel context\n");
 310         CDEBUG(D_INODE, "renaming file %.*s to %.*s\n",
 311                (int)strlen(oldname), oldname, (int)strlen(newname), newname);
 312
 313         dchild_old = ll_lookup_one_len(oldname, dir, strlen(oldname));
 314         if (IS_ERR(dchild_old))
 315                 RETURN(PTR_ERR(dchild_old));
 316
 317         if (!dchild_old->d_inode)
 318                 GOTO(put_old, err = -ENOENT);
 319
 320         dchild_new = ll_lookup_one_len(newname, dir, strlen(newname));
 321         if (IS_ERR(dchild_new))
 322                 GOTO(put_old, err = PTR_ERR(dchild_new));
 323
 324         err = ll_vfs_rename(dir->d_inode, dchild_old, mnt,
 325                             dir->d_inode, dchild_new, mnt);
 326
 327         dput(dchild_new);
 328 put_old:
 329         dput(dchild_old);
 330         RETURN(err);
 331 }
 332 EXPORT_SYMBOL(lustre_rename);
 333
 334 /*
 335  * Read a file from within kernel context.  Prior to calling this
 336  * function we should already have done a push_ctxt().
 337  */
 338 int lustre_fread(struct file *file, void *buf, int len, loff_t *off)
 339 {
 340         ASSERT_KERNEL_CTXT("kernel doing read outside kernel context\n");
 341         if (!file || !file->f_op || !file->f_op->read || !off)
 342                 RETURN(-ENOSYS);
 343
 344         return file->f_op->read(file, buf, len, off);
 345 }
 346 EXPORT_SYMBOL(lustre_fread);
 347
 348 /*
 349  * Write a file from within kernel context.  Prior to calling this
 350  * function we should already have done a push_ctxt().
 351  */
 352 int lustre_fwrite(struct file *file, const void *buf, int len, loff_t *off)
 353 {
 354         ENTRY;
 355         ASSERT_KERNEL_CTXT("kernel doing write outside kernel context\n");
 356         if (!file)
 357                 RETURN(-ENOENT);
 358         if (!file->f_op)
 359                 RETURN(-ENOSYS);
 360         if (!off)
 361                 RETURN(-EINVAL);
 362
 363         if (!file->f_op->write)
 364                 RETURN(-EROFS);
 365
 366         RETURN(file->f_op->write(file, buf, len, off));
 367 }
 368 EXPORT_SYMBOL(lustre_fwrite);
 369
 370 /*
 371  * Sync a file from within kernel context.  Prior to calling this
 372  * function we should already have done a push_ctxt().
 373  */
 374 int lustre_fsync(struct file *file)
 375 {
 376         ENTRY;
 377         ASSERT_KERNEL_CTXT("kernel doing sync outside kernel context\n");
 378         if (!file || !file->f_op || !file->f_op->fsync)
 379                 RETURN(-ENOSYS);
 380
 381         RETURN(cfs_do_fsync(file, 0));
 382 }
 383 EXPORT_SYMBOL(lustre_fsync);
 384
 385 /* Note: dput(dchild) will be called if there is an error */
 386 struct l_file *l_dentry_open(struct lvfs_run_ctxt *ctxt, struct l_dentry *de,
 387                              int flags)
 388 {
 389         mntget(ctxt->pwdmnt);
 390         return ll_dentry_open(de, ctxt->pwdmnt, flags, current_cred());
 391 }
 392 EXPORT_SYMBOL(l_dentry_open);
 393
 394 static int l_filldir(void *__buf, const char *name, int namlen, loff_t offset,
 395                      u64 ino, unsigned int d_type)
 396 {
 397         struct l_linux_dirent *dirent;
 398         struct l_readdir_callback *buf = (struct l_readdir_callback *)__buf;
 399
 400         dirent = buf->lrc_dirent;
 401         if (dirent)
 402                dirent->lld_off = offset;
 403
 404         OBD_ALLOC(dirent, sizeof(*dirent));
 405
 406         if (!dirent)
 407                 return -ENOMEM;
 408
 409         cfs_list_add_tail(&dirent->lld_list, buf->lrc_list);
 410
 411         buf->lrc_dirent = dirent;
 412         dirent->lld_ino = ino;
 413         LASSERT(sizeof(dirent->lld_name) >= namlen + 1);
 414         memcpy(dirent->lld_name, name, namlen);
 415
 416         return 0;
 417 }
 418
 419 long l_readdir(struct file *file, cfs_list_t *dentry_list)
 420 {
 421         struct l_linux_dirent *lastdirent;
 422         struct l_readdir_callback buf;
 423         int error;
 424
 425         buf.lrc_dirent = NULL;
 426         buf.lrc_list = dentry_list;
 427
 428         error = vfs_readdir(file, l_filldir, &buf);
 429         if (error < 0)
 430                 return error;
 431
 432         lastdirent = buf.lrc_dirent;
 433         if (lastdirent)
 434                 lastdirent->lld_off = file->f_pos;
 435
 436         return 0;
 437 }
 438 EXPORT_SYMBOL(l_readdir);
 439
 440 int l_notify_change(struct vfsmount *mnt, struct dentry *dchild,
 441                     struct iattr *newattrs)
 442 {
 443         int rc;
 444
 445         mutex_lock(&dchild->d_inode->i_mutex);
 446 #ifdef HAVE_SECURITY_PLUG
 447         rc = notify_change(dchild, mnt, newattrs);
 448 #else
 449         rc = notify_change(dchild, newattrs);
 450 #endif
 451         mutex_unlock(&dchild->d_inode->i_mutex);
 452         return rc;
 453 }
 454 EXPORT_SYMBOL(l_notify_change);
 455
 456 /* utility to truncate a file */
 457 int simple_truncate(struct dentry *dir, struct vfsmount *mnt,
 458                  char *name, loff_t length)
 459 {
 460         struct dentry *dchild;
 461         struct iattr newattrs;
 462         int err = 0;
 463         ENTRY;
 464
 465         CDEBUG(D_INODE, "truncating file %.*s to %lld\n", (int)strlen(name),
 466                name, (long long)length);
 467         dchild = ll_lookup_one_len(name, dir, strlen(name));
 468         if (IS_ERR(dchild))
 469                 GOTO(out, err = PTR_ERR(dchild));
 470
 471         if (dchild->d_inode) {
 472                 int old_mode = dchild->d_inode->i_mode;
 473                 if (S_ISDIR(old_mode)) {
 474                         CERROR("found %s (%lu/%u) is mode %o\n", name,
 475                                dchild->d_inode->i_ino,
 476                                dchild->d_inode->i_generation, old_mode);
 477                         GOTO(out_dput, err = -EISDIR);
 478                 }
 479
 480                 newattrs.ia_size = length;
 481                 newattrs.ia_valid = ATTR_SIZE;
 482                 err = l_notify_change(mnt, dchild, &newattrs);
 483         }
 484         EXIT;
 485 out_dput:
 486         dput(dchild);
 487 out:
 488         return err;
 489 }
 490 EXPORT_SYMBOL(simple_truncate);
 491
 492 int __lvfs_set_rdonly(lvfs_sbdev_type dev, lvfs_sbdev_type jdev)
 493 {
 494 #ifdef HAVE_DEV_SET_RDONLY
 495         if (jdev && (jdev != dev)) {
 496                 CDEBUG(D_IOCTL | D_HA, "set journal dev %lx rdonly\n",
 497                        (long)jdev);
 498                 dev_set_rdonly(jdev);
 499         }
 500         CDEBUG(D_IOCTL | D_HA, "set dev %lx rdonly\n", (long)dev);
 501         dev_set_rdonly(dev);
 502
 503         return 0;
 504 #else
 505         CERROR("DEV %lx CANNOT BE SET READONLY\n", (long)dev);
 506
 507         return -EOPNOTSUPP;
 508 #endif
 509 }
 510 EXPORT_SYMBOL(__lvfs_set_rdonly);
 511
 512 int lvfs_check_rdonly(lvfs_sbdev_type dev)
 513 {
 514 #ifdef HAVE_DEV_SET_RDONLY
 515         return dev_check_rdonly(dev);
 516 #else
 517         return 0;
 518 #endif
 519 }
 520 EXPORT_SYMBOL(lvfs_check_rdonly);
 521
 522 int lvfs_check_io_health(struct obd_device *obd, struct file *file)
 523 {
 524         char *write_page = NULL;
 525         loff_t offset = 0;
 526         int rc = 0;
 527         ENTRY;
 528
 529         OBD_ALLOC(write_page, CFS_PAGE_SIZE);
 530         if (!write_page)
 531                 RETURN(-ENOMEM);
 532
 533         rc = fsfilt_write_record(obd, file, write_page, CFS_PAGE_SIZE, &offset, 1);
 534
 535         OBD_FREE(write_page, CFS_PAGE_SIZE);
 536
 537         CDEBUG(D_INFO, "write 1 page synchronously for checking io rc %d\n",rc);
 538         RETURN(rc);
 539 }
 540 EXPORT_SYMBOL(lvfs_check_io_health);
 541
 542 void obd_update_maxusage()
 543 {
 544         __u64 max1, max2;
 545
 546         max1 = obd_pages_sum();
 547         max2 = obd_memory_sum();
 548
 549         spin_lock(&obd_updatemax_lock);
 550         if (max1 > obd_max_pages)
 551                 obd_max_pages = max1;
 552         if (max2 > obd_max_alloc)
 553                 obd_max_alloc = max2;
 554         spin_unlock(&obd_updatemax_lock);
 555
 556 }
 557 EXPORT_SYMBOL(obd_update_maxusage);
 558
 559 __u64 obd_memory_max(void)
 560 {
 561         __u64 ret;
 562
 563         spin_lock(&obd_updatemax_lock);
 564         ret = obd_max_alloc;
 565         spin_unlock(&obd_updatemax_lock);
 566
 567         return ret;
 568 }
 569 EXPORT_SYMBOL(obd_memory_max);
 570
 571 __u64 obd_pages_max(void)
 572 {
 573         __u64 ret;
 574
 575         spin_lock(&obd_updatemax_lock);
 576         ret = obd_max_pages;
 577         spin_unlock(&obd_updatemax_lock);
 578
 579         return ret;
 580 }
 581 EXPORT_SYMBOL(obd_pages_max);
 582
 583 #ifdef LPROCFS
 584 __s64 lprocfs_read_helper(struct lprocfs_counter *lc,
 585                           enum lprocfs_fields_flags field)
 586 {
 587         __s64 ret = 0;
 588
 589         if (lc == NULL)
 590                 RETURN(0);
 591
 592         switch (field) {
 593                 case LPROCFS_FIELDS_FLAGS_CONFIG:
 594                         ret = lc->lc_config;
 595                         break;
 596                 case LPROCFS_FIELDS_FLAGS_SUM:
 597                         ret = lc->lc_sum + lc->lc_sum_irq;
 598                         break;
 599                 case LPROCFS_FIELDS_FLAGS_MIN:
 600                         ret = lc->lc_min;
 601                         break;
 602                 case LPROCFS_FIELDS_FLAGS_MAX:
 603                         ret = lc->lc_max;
 604                         break;
 605                 case LPROCFS_FIELDS_FLAGS_AVG:
 606                         ret = (lc->lc_max - lc->lc_min) / 2;
 607                         break;
 608                 case LPROCFS_FIELDS_FLAGS_SUMSQUARE:
 609                         ret = lc->lc_sumsquare;
 610                         break;
 611                 case LPROCFS_FIELDS_FLAGS_COUNT:
 612                         ret = lc->lc_count;
 613                         break;
 614                 default:
 615                         break;
 616         };
 617
 618         RETURN(ret);
 619 }
 620 EXPORT_SYMBOL(lprocfs_read_helper);
 621 #endif /* LPROCFS */
 622
 623 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
 624 MODULE_DESCRIPTION("Lustre VFS Filesystem Helper v0.1");
 625 MODULE_LICENSE("GPL");