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, Whamcloud, Inc.
  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 #include "lvfs_internal.h"
  58
  59 #include <obd.h>
  60 #include <lustre_lib.h>
  61 #include <lustre_quota.h>
  62
  63 __u64 obd_max_pages = 0;
  64 __u64 obd_max_alloc = 0;
  65 struct lprocfs_stats *obd_memory = NULL;
  66 EXPORT_SYMBOL(obd_memory);
  67 cfs_spinlock_t obd_updatemax_lock = CFS_SPIN_LOCK_UNLOCKED;
  68 /* refine later and change to seqlock or simlar from libcfs */
  69
  70 /* Debugging check only needed during development */
  71 #ifdef OBD_CTXT_DEBUG
  72 # define ASSERT_CTXT_MAGIC(magic) LASSERT((magic) == OBD_RUN_CTXT_MAGIC)
  73 # define ASSERT_NOT_KERNEL_CTXT(msg) LASSERTF(!segment_eq(get_fs(), get_ds()),\
  74                                               msg)
  75 # define ASSERT_KERNEL_CTXT(msg) LASSERTF(segment_eq(get_fs(), get_ds()), msg)
  76 #else
  77 # define ASSERT_CTXT_MAGIC(magic) do {} while(0)
  78 # define ASSERT_NOT_KERNEL_CTXT(msg) do {} while(0)
  79 # define ASSERT_KERNEL_CTXT(msg) do {} while(0)
  80 #endif
  81
  82 static void push_group_info(struct lvfs_run_ctxt *save,
  83                             struct group_info *ginfo)
  84 {
  85         if (!ginfo) {
  86                 save->ngroups = current_ngroups;
  87                 current_ngroups = 0;
  88         } else {
  89                 struct cred *cred;
  90                 task_lock(current);
  91                 save->group_info = current_cred()->group_info;
  92                 if ((cred = prepare_creds())) {
  93                         cred->group_info = ginfo;
  94                         commit_creds(cred);
  95                 }
  96                 task_unlock(current);
  97         }
  98 }
  99
 100 static void pop_group_info(struct lvfs_run_ctxt *save,
 101                            struct group_info *ginfo)
 102 {
 103         if (!ginfo) {
 104                 current_ngroups = save->ngroups;
 105         } else {
 106                 struct cred *cred;
 107                 task_lock(current);
 108                 if ((cred = prepare_creds())) {
 109                         cred->group_info = save->group_info;
 110                         commit_creds(cred);
 111                 }
 112                 task_unlock(current);
 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         OBD_SET_CTXT_MAGIC(save);
 123
 124         save->fs = get_fs();
 125         LASSERT(d_refcount(cfs_fs_pwd(current->fs)));
 126         LASSERT(d_refcount(new_ctx->pwd));
 127         save->pwd = dget(cfs_fs_pwd(current->fs));
 128         save->pwdmnt = mntget(cfs_fs_mnt(current->fs));
 129         save->luc.luc_umask = cfs_curproc_umask();
 130         save->ngroups = current_cred()->group_info->ngroups;
 131
 132         LASSERT(save->pwd);
 133         LASSERT(save->pwdmnt);
 134         LASSERT(new_ctx->pwd);
 135         LASSERT(new_ctx->pwdmnt);
 136
 137         if (uc) {
 138                 struct cred *cred;
 139                 save->luc.luc_uid = current_uid();
 140                 save->luc.luc_gid = current_gid();
 141                 save->luc.luc_fsuid = current_fsuid();
 142                 save->luc.luc_fsgid = current_fsgid();
 143                 save->luc.luc_cap = current_cap();
 144
 145                 if ((cred = prepare_creds())) {
 146                         cred->uid = uc->luc_uid;
 147                         cred->gid = uc->luc_gid;
 148                         cred->fsuid = uc->luc_fsuid;
 149                         cred->fsgid = uc->luc_fsgid;
 150                         cred->cap_effective = uc->luc_cap;
 151                         commit_creds(cred);
 152                 }
 153
 154                 push_group_info(save,
 155                                 uc->luc_ginfo ?:
 156                                 uc->luc_identity ? uc->luc_identity->mi_ginfo :
 157                                                    NULL);
 158         }
 159         current->fs->umask = 0; /* umask already applied on client */
 160         set_fs(new_ctx->fs);
 161         ll_set_fs_pwd(current->fs, new_ctx->pwdmnt, new_ctx->pwd);
 162 }
 163 EXPORT_SYMBOL(push_ctxt);
 164
 165 void pop_ctxt(struct lvfs_run_ctxt *saved, struct lvfs_run_ctxt *new_ctx,
 166               struct lvfs_ucred *uc)
 167 {
 168         ASSERT_CTXT_MAGIC(saved->magic);
 169         ASSERT_KERNEL_CTXT("popping non-kernel context!\n");
 170
 171         LASSERTF(cfs_fs_pwd(current->fs) == new_ctx->pwd, "%p != %p\n",
 172                  cfs_fs_pwd(current->fs), new_ctx->pwd);
 173         LASSERTF(cfs_fs_mnt(current->fs) == new_ctx->pwdmnt, "%p != %p\n",
 174                  cfs_fs_mnt(current->fs), new_ctx->pwdmnt);
 175
 176         set_fs(saved->fs);
 177         ll_set_fs_pwd(current->fs, saved->pwdmnt, saved->pwd);
 178
 179         dput(saved->pwd);
 180         mntput(saved->pwdmnt);
 181         current->fs->umask = saved->luc.luc_umask;
 182         if (uc) {
 183                 struct cred *cred;
 184                 if ((cred = prepare_creds())) {
 185                         cred->uid = saved->luc.luc_uid;
 186                         cred->gid = saved->luc.luc_gid;
 187                         cred->fsuid = saved->luc.luc_fsuid;
 188                         cred->fsgid = saved->luc.luc_fsgid;
 189                         cred->cap_effective = saved->luc.luc_cap;
 190                         commit_creds(cred);
 191                 }
 192
 193                 pop_group_info(saved,
 194                                uc->luc_ginfo ?:
 195                                uc->luc_identity ? uc->luc_identity->mi_ginfo :
 196                                                   NULL);
 197         }
 198 }
 199 EXPORT_SYMBOL(pop_ctxt);
 200
 201 /* utility to make a file */
 202 struct dentry *simple_mknod(struct dentry *dir, char *name, int mode, int fix)
 203 {
 204         struct dentry *dchild;
 205         int err = 0;
 206         ENTRY;
 207
 208         // ASSERT_KERNEL_CTXT("kernel doing mknod outside kernel context\n");
 209         CDEBUG(D_INODE, "creating file %.*s\n", (int)strlen(name), name);
 210
 211         dchild = ll_lookup_one_len(name, dir, strlen(name));
 212         if (IS_ERR(dchild))
 213                 GOTO(out_up, dchild);
 214
 215         if (dchild->d_inode) {
 216                 int old_mode = dchild->d_inode->i_mode;
 217                 if (!S_ISREG(old_mode))
 218                         GOTO(out_err, err = -EEXIST);
 219
 220                 /* Fixup file permissions if necessary */
 221                 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
 222                         CWARN("fixing permissions on %s from %o to %o\n",
 223                               name, old_mode, mode);
 224                         dchild->d_inode->i_mode = (mode & S_IALLUGO) |
 225                                                   (old_mode & ~S_IALLUGO);
 226                         mark_inode_dirty(dchild->d_inode);
 227                 }
 228                 GOTO(out_up, dchild);
 229         }
 230
 231         err = ll_vfs_create(dir->d_inode, dchild, (mode & ~S_IFMT) | S_IFREG,
 232                             NULL);
 233         if (err)
 234                 GOTO(out_err, err);
 235
 236         RETURN(dchild);
 237
 238 out_err:
 239         dput(dchild);
 240         dchild = ERR_PTR(err);
 241 out_up:
 242         return dchild;
 243 }
 244 EXPORT_SYMBOL(simple_mknod);
 245
 246 /* utility to make a directory */
 247 struct dentry *simple_mkdir(struct dentry *dir, struct vfsmount *mnt,
 248                             const char *name, int mode, int fix)
 249 {
 250         struct dentry *dchild;
 251         int err = 0;
 252         ENTRY;
 253
 254         // ASSERT_KERNEL_CTXT("kernel doing mkdir outside kernel context\n");
 255         CDEBUG(D_INODE, "creating directory %.*s\n", (int)strlen(name), name);
 256         dchild = ll_lookup_one_len(name, dir, strlen(name));
 257         if (IS_ERR(dchild))
 258                 GOTO(out_up, dchild);
 259
 260         if (dchild->d_inode) {
 261                 int old_mode = dchild->d_inode->i_mode;
 262                 if (!S_ISDIR(old_mode)) {
 263                         CERROR("found %s (%lu/%u) is mode %o\n", name,
 264                                dchild->d_inode->i_ino,
 265                                dchild->d_inode->i_generation, old_mode);
 266                         GOTO(out_err, err = -ENOTDIR);
 267                 }
 268
 269                 /* Fixup directory permissions if necessary */
 270                 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
 271                         CDEBUG(D_CONFIG,
 272                                "fixing permissions on %s from %o to %o\n",
 273                                name, old_mode, mode);
 274                         dchild->d_inode->i_mode = (mode & S_IALLUGO) |
 275                                                   (old_mode & ~S_IALLUGO);
 276                         mark_inode_dirty(dchild->d_inode);
 277                 }
 278                 GOTO(out_up, dchild);
 279         }
 280
 281         err = ll_vfs_mkdir(dir->d_inode, dchild, mnt, mode);
 282         if (err)
 283                 GOTO(out_err, err);
 284
 285         RETURN(dchild);
 286
 287 out_err:
 288         dput(dchild);
 289         dchild = ERR_PTR(err);
 290 out_up:
 291         return dchild;
 292 }
 293 EXPORT_SYMBOL(simple_mkdir);
 294
 295 /* utility to rename a file */
 296 int lustre_rename(struct dentry *dir, struct vfsmount *mnt,
 297                   char *oldname, char *newname)
 298 {
 299         struct dentry *dchild_old, *dchild_new;
 300         int err = 0;
 301         ENTRY;
 302
 303         ASSERT_KERNEL_CTXT("kernel doing rename outside kernel context\n");
 304         CDEBUG(D_INODE, "renaming file %.*s to %.*s\n",
 305                (int)strlen(oldname), oldname, (int)strlen(newname), newname);
 306
 307         dchild_old = ll_lookup_one_len(oldname, dir, strlen(oldname));
 308         if (IS_ERR(dchild_old))
 309                 RETURN(PTR_ERR(dchild_old));
 310
 311         if (!dchild_old->d_inode)
 312                 GOTO(put_old, err = -ENOENT);
 313
 314         dchild_new = ll_lookup_one_len(newname, dir, strlen(newname));
 315         if (IS_ERR(dchild_new))
 316                 GOTO(put_old, err = PTR_ERR(dchild_new));
 317
 318         err = ll_vfs_rename(dir->d_inode, dchild_old, mnt,
 319                             dir->d_inode, dchild_new, mnt);
 320
 321         dput(dchild_new);
 322 put_old:
 323         dput(dchild_old);
 324         RETURN(err);
 325 }
 326 EXPORT_SYMBOL(lustre_rename);
 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(cfs_do_fsync(file, 0));
 376 }
 377 EXPORT_SYMBOL(lustre_fsync);
 378
 379 /* Note: dput(dchild) will be called if there is an error */
 380 struct l_file *l_dentry_open(struct lvfs_run_ctxt *ctxt, struct l_dentry *de,
 381                              int flags)
 382 {
 383         mntget(ctxt->pwdmnt);
 384         return ll_dentry_open(de, ctxt->pwdmnt, flags, current_cred());
 385 }
 386 EXPORT_SYMBOL(l_dentry_open);
 387
 388 static int l_filldir(void *__buf, const char *name, int namlen, loff_t offset,
 389                      u64 ino, unsigned int d_type)
 390 {
 391         struct l_linux_dirent *dirent;
 392         struct l_readdir_callback *buf = (struct l_readdir_callback *)__buf;
 393
 394         dirent = buf->lrc_dirent;
 395         if (dirent)
 396                dirent->lld_off = offset;
 397
 398         OBD_ALLOC(dirent, sizeof(*dirent));
 399
 400         if (!dirent)
 401                 return -ENOMEM;
 402
 403         cfs_list_add_tail(&dirent->lld_list, buf->lrc_list);
 404
 405         buf->lrc_dirent = dirent;
 406         dirent->lld_ino = ino;
 407         LASSERT(sizeof(dirent->lld_name) >= namlen + 1);
 408         memcpy(dirent->lld_name, name, namlen);
 409
 410         return 0;
 411 }
 412
 413 long l_readdir(struct file *file, cfs_list_t *dentry_list)
 414 {
 415         struct l_linux_dirent *lastdirent;
 416         struct l_readdir_callback buf;
 417         int error;
 418
 419         buf.lrc_dirent = NULL;
 420         buf.lrc_list = dentry_list;
 421
 422         error = vfs_readdir(file, l_filldir, &buf);
 423         if (error < 0)
 424                 return error;
 425
 426         lastdirent = buf.lrc_dirent;
 427         if (lastdirent)
 428                 lastdirent->lld_off = file->f_pos;
 429
 430         return 0;
 431 }
 432 EXPORT_SYMBOL(l_readdir);
 433
 434 int l_notify_change(struct vfsmount *mnt, struct dentry *dchild,
 435                     struct iattr *newattrs)
 436 {
 437         int rc;
 438
 439         mutex_lock(&dchild->d_inode->i_mutex);
 440 #ifdef HAVE_SECURITY_PLUG
 441         rc = notify_change(dchild, mnt, newattrs);
 442 #else
 443         rc = notify_change(dchild, newattrs);
 444 #endif
 445         mutex_unlock(&dchild->d_inode->i_mutex);
 446         return rc;
 447 }
 448 EXPORT_SYMBOL(l_notify_change);
 449
 450 /* utility to truncate a file */
 451 int simple_truncate(struct dentry *dir, struct vfsmount *mnt,
 452                  char *name, loff_t length)
 453 {
 454         struct dentry *dchild;
 455         struct iattr newattrs;
 456         int err = 0;
 457         ENTRY;
 458
 459         CDEBUG(D_INODE, "truncating file %.*s to %lld\n", (int)strlen(name),
 460                name, (long long)length);
 461         dchild = ll_lookup_one_len(name, dir, strlen(name));
 462         if (IS_ERR(dchild))
 463                 GOTO(out, err = PTR_ERR(dchild));
 464
 465         if (dchild->d_inode) {
 466                 int old_mode = dchild->d_inode->i_mode;
 467                 if (S_ISDIR(old_mode)) {
 468                         CERROR("found %s (%lu/%u) is mode %o\n", name,
 469                                dchild->d_inode->i_ino,
 470                                dchild->d_inode->i_generation, old_mode);
 471                         GOTO(out_dput, err = -EISDIR);
 472                 }
 473
 474                 newattrs.ia_size = length;
 475                 newattrs.ia_valid = ATTR_SIZE;
 476                 err = l_notify_change(mnt, dchild, &newattrs);
 477         }
 478         EXIT;
 479 out_dput:
 480         dput(dchild);
 481 out:
 482         return err;
 483 }
 484 EXPORT_SYMBOL(simple_truncate);
 485
 486 int __lvfs_set_rdonly(lvfs_sbdev_type dev, lvfs_sbdev_type jdev)
 487 {
 488 #ifdef HAVE_DEV_SET_RDONLY
 489         if (jdev && (jdev != dev)) {
 490                 CDEBUG(D_IOCTL | D_HA, "set journal dev %lx rdonly\n",
 491                        (long)jdev);
 492                 dev_set_rdonly(jdev);
 493         }
 494         CDEBUG(D_IOCTL | D_HA, "set dev %lx rdonly\n", (long)dev);
 495         dev_set_rdonly(dev);
 496
 497         return 0;
 498 #else
 499         CERROR("DEV %lx CANNOT BE SET READONLY\n", (long)dev);
 500
 501         return -EOPNOTSUPP;
 502 #endif
 503 }
 504 EXPORT_SYMBOL(__lvfs_set_rdonly);
 505
 506 int lvfs_check_rdonly(lvfs_sbdev_type dev)
 507 {
 508 #ifdef HAVE_DEV_SET_RDONLY
 509         return dev_check_rdonly(dev);
 510 #else
 511         return 0;
 512 #endif
 513 }
 514 EXPORT_SYMBOL(lvfs_check_rdonly);
 515
 516 int lvfs_check_io_health(struct obd_device *obd, struct file *file)
 517 {
 518         char *write_page = NULL;
 519         loff_t offset = 0;
 520         int rc = 0;
 521         ENTRY;
 522
 523         OBD_ALLOC(write_page, CFS_PAGE_SIZE);
 524         if (!write_page)
 525                 RETURN(-ENOMEM);
 526
 527         rc = fsfilt_write_record(obd, file, write_page, CFS_PAGE_SIZE, &offset, 1);
 528
 529         OBD_FREE(write_page, CFS_PAGE_SIZE);
 530
 531         CDEBUG(D_INFO, "write 1 page synchronously for checking io rc %d\n",rc);
 532         RETURN(rc);
 533 }
 534 EXPORT_SYMBOL(lvfs_check_io_health);
 535
 536 void obd_update_maxusage()
 537 {
 538         __u64 max1, max2;
 539
 540         max1 = obd_pages_sum();
 541         max2 = obd_memory_sum();
 542
 543         cfs_spin_lock(&obd_updatemax_lock);
 544         if (max1 > obd_max_pages)
 545                 obd_max_pages = max1;
 546         if (max2 > obd_max_alloc)
 547                 obd_max_alloc = max2;
 548         cfs_spin_unlock(&obd_updatemax_lock);
 549
 550 }
 551 EXPORT_SYMBOL(obd_update_maxusage);
 552
 553 __u64 obd_memory_max(void)
 554 {
 555         __u64 ret;
 556
 557         cfs_spin_lock(&obd_updatemax_lock);
 558         ret = obd_max_alloc;
 559         cfs_spin_unlock(&obd_updatemax_lock);
 560
 561         return ret;
 562 }
 563 EXPORT_SYMBOL(obd_memory_max);
 564
 565 __u64 obd_pages_max(void)
 566 {
 567         __u64 ret;
 568
 569         cfs_spin_lock(&obd_updatemax_lock);
 570         ret = obd_max_pages;
 571         cfs_spin_unlock(&obd_updatemax_lock);
 572
 573         return ret;
 574 }
 575 EXPORT_SYMBOL(obd_pages_max);
 576
 577 #ifdef LPROCFS
 578 __s64 lprocfs_read_helper(struct lprocfs_counter *lc,
 579                           enum lprocfs_fields_flags field)
 580 {
 581         __s64 ret = 0;
 582         int centry;
 583
 584         if (!lc)
 585                 RETURN(0);
 586         do {
 587                 centry = cfs_atomic_read(&lc->lc_cntl.la_entry);
 588
 589                 switch (field) {
 590                         case LPROCFS_FIELDS_FLAGS_CONFIG:
 591                                 ret = lc->lc_config;
 592                                 break;
 593                         case LPROCFS_FIELDS_FLAGS_SUM:
 594                                 ret = lc->lc_sum + lc->lc_sum_irq;
 595                                 break;
 596                         case LPROCFS_FIELDS_FLAGS_MIN:
 597                                 ret = lc->lc_min;
 598                                 break;
 599                         case LPROCFS_FIELDS_FLAGS_MAX:
 600                                 ret = lc->lc_max;
 601                                 break;
 602                         case LPROCFS_FIELDS_FLAGS_AVG:
 603                                 ret = (lc->lc_max - lc->lc_min)/2;
 604                                 break;
 605                         case LPROCFS_FIELDS_FLAGS_SUMSQUARE:
 606                                 ret = lc->lc_sumsquare;
 607                                 break;
 608                         case LPROCFS_FIELDS_FLAGS_COUNT:
 609                                 ret = lc->lc_count;
 610                                 break;
 611                         default:
 612                                 break;
 613                 };
 614         } while (centry != cfs_atomic_read(&lc->lc_cntl.la_entry) &&
 615                  centry != cfs_atomic_read(&lc->lc_cntl.la_exit));
 616
 617         RETURN(ret);
 618 }
 619 EXPORT_SYMBOL(lprocfs_read_helper);
 620 #endif /* LPROCFS */
 621
 622 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
 623 MODULE_DESCRIPTION("Lustre VFS Filesystem Helper v0.1");
 624 MODULE_LICENSE("GPL");