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  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  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 #ifndef EXPORT_SYMTAB
  42 # define EXPORT_SYMTAB
  43 #endif
  44
  45 #define DEBUG_SUBSYSTEM S_FILTER
  46
  47 #include <linux/version.h>
  48 #include <linux/fs.h>
  49 #include <asm/unistd.h>
  50 #include <linux/slab.h>
  51 #include <linux/pagemap.h>
  52 #include <linux/quotaops.h>
  53 #include <linux/version.h>
  54 #include <libcfs/libcfs.h>
  55 #include <lustre_fsfilt.h>
  56 #include <obd.h>
  57 #include <linux/module.h>
  58 #include <linux/init.h>
  59 #include <linux/lustre_compat25.h>
  60 #include <lvfs.h>
  61 #include "lvfs_internal.h"
  62
  63 #include <obd.h>
  64 #include <lustre_lib.h>
  65 #include <lustre_quota.h>
  66
  67 __u64 obd_max_pages = 0;
  68 __u64 obd_max_alloc = 0;
  69 struct lprocfs_stats *obd_memory = NULL;
  70 spinlock_t obd_updatemax_lock = SPIN_LOCK_UNLOCKED;
  71 /* refine later and change to seqlock or simlar from libcfs */
  72
  73 /* Debugging check only needed during development */
  74 #ifdef OBD_CTXT_DEBUG
  75 # define ASSERT_CTXT_MAGIC(magic) LASSERT((magic) == OBD_RUN_CTXT_MAGIC)
  76 # define ASSERT_NOT_KERNEL_CTXT(msg) LASSERTF(!segment_eq(get_fs(), get_ds()),\
  77                                               msg)
  78 # define ASSERT_KERNEL_CTXT(msg) LASSERTF(segment_eq(get_fs(), get_ds()), msg)
  79 #else
  80 # define ASSERT_CTXT_MAGIC(magic) do {} while(0)
  81 # define ASSERT_NOT_KERNEL_CTXT(msg) do {} while(0)
  82 # define ASSERT_KERNEL_CTXT(msg) do {} while(0)
  83 #endif
  84
  85 static void push_group_info(struct lvfs_run_ctxt *save,
  86                             struct group_info *ginfo)
  87 {
  88         if (!ginfo) {
  89                 save->ngroups = current_ngroups;
  90                 current_ngroups = 0;
  91         } else {
  92                 task_lock(current);
  93                 save->group_info = current->group_info;
  94                 current->group_info = ginfo;
  95                 task_unlock(current);
  96         }
  97 }
  98
  99 static void pop_group_info(struct lvfs_run_ctxt *save,
 100                            struct group_info *ginfo)
 101 {
 102         if (!ginfo) {
 103                 current_ngroups = save->ngroups;
 104         } else {
 105                 task_lock(current);
 106                 current->group_info = save->group_info;
 107                 task_unlock(current);
 108         }
 109 }
 110
 111 /* push / pop to root of obd store */
 112 void push_ctxt(struct lvfs_run_ctxt *save, struct lvfs_run_ctxt *new_ctx,
 113                struct lvfs_ucred *uc)
 114 {
 115         //ASSERT_NOT_KERNEL_CTXT("already in kernel context!\n");
 116         ASSERT_CTXT_MAGIC(new_ctx->magic);
 117         OBD_SET_CTXT_MAGIC(save);
 118
 119         /*
 120         CDEBUG(D_INFO,
 121                "= push %p->%p = cur fs %p pwd %p:d%d:i%d (%.*s), pwdmnt %p:%d\n",
 122                save, current, current->fs, current->fs->pwd,
 123                atomic_read(&current->fs->pwd->d_count),
 124                atomic_read(&current->fs->pwd->d_inode->i_count),
 125                current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
 126                current->fs->pwdmnt,
 127                atomic_read(&current->fs->pwdmnt->mnt_count));
 128         */
 129
 130         save->fs = get_fs();
 131         LASSERT(atomic_read(&current->fs->pwd->d_count));
 132         LASSERT(atomic_read(&new_ctx->pwd->d_count));
 133         save->pwd = dget(current->fs->pwd);
 134         save->pwdmnt = mntget(current->fs->pwdmnt);
 135         save->luc.luc_umask = current->fs->umask;
 136         save->ngroups = current->group_info->ngroups;
 137
 138         LASSERT(save->pwd);
 139         LASSERT(save->pwdmnt);
 140         LASSERT(new_ctx->pwd);
 141         LASSERT(new_ctx->pwdmnt);
 142
 143         if (uc) {
 144                 save->luc.luc_uid = current->uid;
 145                 save->luc.luc_gid = current->gid;
 146                 save->luc.luc_fsuid = current->fsuid;
 147                 save->luc.luc_fsgid = current->fsgid;
 148                 save->luc.luc_cap = current->cap_effective;
 149
 150                 current->uid = uc->luc_uid;
 151                 current->gid = uc->luc_gid;
 152                 current->fsuid = uc->luc_fsuid;
 153                 current->fsgid = uc->luc_fsgid;
 154                 current->cap_effective = uc->luc_cap;
 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         /*
 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         //printk("pc1");
 184         ASSERT_KERNEL_CTXT("popping non-kernel context!\n");
 185
 186         /*
 187         CDEBUG(D_INFO,
 188                " = pop  %p==%p = cur %p pwd %p:d%d:i%d (%.*s), pwdmnt %p:%d\n",
 189                new_ctx, current, current->fs, current->fs->pwd,
 190                atomic_read(&current->fs->pwd->d_count),
 191                atomic_read(&current->fs->pwd->d_inode->i_count),
 192                current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
 193                current->fs->pwdmnt,
 194                atomic_read(&current->fs->pwdmnt->mnt_count));
 195         */
 196
 197         LASSERTF(current->fs->pwd == new_ctx->pwd, "%p != %p\n",
 198                  current->fs->pwd, new_ctx->pwd);
 199         LASSERTF(current->fs->pwdmnt == new_ctx->pwdmnt, "%p != %p\n",
 200                  current->fs->pwdmnt, new_ctx->pwdmnt);
 201
 202         set_fs(saved->fs);
 203         ll_set_fs_pwd(current->fs, saved->pwdmnt, saved->pwd);
 204
 205         dput(saved->pwd);
 206         mntput(saved->pwdmnt);
 207         current->fs->umask = saved->luc.luc_umask;
 208         if (uc) {
 209                 current->uid = saved->luc.luc_uid;
 210                 current->gid = saved->luc.luc_gid;
 211                 current->fsuid = saved->luc.luc_fsuid;
 212                 current->fsgid = saved->luc.luc_fsgid;
 213                 current->cap_effective = saved->luc.luc_cap;
 214                 pop_group_info(saved,
 215                                uc->luc_ginfo ?:
 216                                uc->luc_identity ? uc->luc_identity->mi_ginfo :
 217                                                   NULL);
 218         }
 219
 220         /*
 221         CDEBUG(D_INFO,
 222                "= pop  %p->%p = cur fs %p pwd %p:d%d:i%d (%.*s), pwdmnt %p:%d\n",
 223                saved, current, current->fs, current->fs->pwd,
 224                atomic_read(&current->fs->pwd->d_count),
 225                atomic_read(&current->fs->pwd->d_inode->i_count),
 226                current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
 227                current->fs->pwdmnt,
 228                atomic_read(&current->fs->pwdmnt->mnt_count));
 229         */
 230 }
 231 EXPORT_SYMBOL(pop_ctxt);
 232
 233 /* utility to make a file */
 234 struct dentry *simple_mknod(struct dentry *dir, char *name, int mode, int fix)
 235 {
 236         struct dentry *dchild;
 237         int err = 0;
 238         ENTRY;
 239
 240         // ASSERT_KERNEL_CTXT("kernel doing mknod outside kernel context\n");
 241         CDEBUG(D_INODE, "creating file %.*s\n", (int)strlen(name), name);
 242
 243         dchild = ll_lookup_one_len(name, dir, strlen(name));
 244         if (IS_ERR(dchild))
 245                 GOTO(out_up, dchild);
 246
 247         if (dchild->d_inode) {
 248                 int old_mode = dchild->d_inode->i_mode;
 249                 if (!S_ISREG(old_mode))
 250                         GOTO(out_err, err = -EEXIST);
 251
 252                 /* Fixup file permissions if necessary */
 253                 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
 254                         CWARN("fixing permissions on %s from %o to %o\n",
 255                               name, old_mode, mode);
 256                         dchild->d_inode->i_mode = (mode & S_IALLUGO) |
 257                                                   (old_mode & ~S_IALLUGO);
 258                         mark_inode_dirty(dchild->d_inode);
 259                 }
 260                 GOTO(out_up, dchild);
 261         }
 262
 263         err = ll_vfs_create(dir->d_inode, dchild, (mode & ~S_IFMT) | S_IFREG,
 264                             NULL);
 265         if (err)
 266                 GOTO(out_err, err);
 267
 268         RETURN(dchild);
 269
 270 out_err:
 271         dput(dchild);
 272         dchild = ERR_PTR(err);
 273 out_up:
 274         return dchild;
 275 }
 276 EXPORT_SYMBOL(simple_mknod);
 277
 278 /* utility to make a directory */
 279 struct dentry *simple_mkdir(struct dentry *dir, struct vfsmount *mnt,
 280                             char *name, int mode, int fix)
 281 {
 282         struct dentry *dchild;
 283         int err = 0;
 284         ENTRY;
 285
 286         // ASSERT_KERNEL_CTXT("kernel doing mkdir outside kernel context\n");
 287         CDEBUG(D_INODE, "creating directory %.*s\n", (int)strlen(name), name);
 288         dchild = ll_lookup_one_len(name, dir, strlen(name));
 289         if (IS_ERR(dchild))
 290                 GOTO(out_up, dchild);
 291
 292         if (dchild->d_inode) {
 293                 int old_mode = dchild->d_inode->i_mode;
 294                 if (!S_ISDIR(old_mode)) {
 295                         CERROR("found %s (%lu/%u) is mode %o\n", name,
 296                                dchild->d_inode->i_ino,
 297                                dchild->d_inode->i_generation, old_mode);
 298                         GOTO(out_err, err = -ENOTDIR);
 299                 }
 300
 301                 /* Fixup directory permissions if necessary */
 302                 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
 303                         CDEBUG(D_CONFIG,
 304                                "fixing permissions on %s from %o to %o\n",
 305                                name, old_mode, mode);
 306                         dchild->d_inode->i_mode = (mode & S_IALLUGO) |
 307                                                   (old_mode & ~S_IALLUGO);
 308                         mark_inode_dirty(dchild->d_inode);
 309                 }
 310                 GOTO(out_up, dchild);
 311         }
 312
 313         err = ll_vfs_mkdir(dir->d_inode, dchild, mnt, mode);
 314         if (err)
 315                 GOTO(out_err, err);
 316
 317         RETURN(dchild);
 318
 319 out_err:
 320         dput(dchild);
 321         dchild = ERR_PTR(err);
 322 out_up:
 323         return dchild;
 324 }
 325 EXPORT_SYMBOL(simple_mkdir);
 326
 327 /* utility to rename a file */
 328 int lustre_rename(struct dentry *dir, struct vfsmount *mnt,
 329                   char *oldname, char *newname)
 330 {
 331         struct dentry *dchild_old, *dchild_new;
 332         int err = 0;
 333         ENTRY;
 334
 335         ASSERT_KERNEL_CTXT("kernel doing rename outside kernel context\n");
 336         CDEBUG(D_INODE, "renaming file %.*s to %.*s\n",
 337                (int)strlen(oldname), oldname, (int)strlen(newname), newname);
 338
 339         dchild_old = ll_lookup_one_len(oldname, dir, strlen(oldname));
 340         if (IS_ERR(dchild_old))
 341                 RETURN(PTR_ERR(dchild_old));
 342
 343         if (!dchild_old->d_inode)
 344                 GOTO(put_old, err = -ENOENT);
 345
 346         dchild_new = ll_lookup_one_len(newname, dir, strlen(newname));
 347         if (IS_ERR(dchild_new))
 348                 GOTO(put_old, err = PTR_ERR(dchild_new));
 349
 350         err = ll_vfs_rename(dir->d_inode, dchild_old, mnt,
 351                             dir->d_inode, dchild_new, mnt);
 352
 353         dput(dchild_new);
 354 put_old:
 355         dput(dchild_old);
 356         RETURN(err);
 357 }
 358 EXPORT_SYMBOL(lustre_rename);
 359
 360 /*
 361  * Read a file from within kernel context.  Prior to calling this
 362  * function we should already have done a push_ctxt().
 363  */
 364 int lustre_fread(struct file *file, void *buf, int len, loff_t *off)
 365 {
 366         ASSERT_KERNEL_CTXT("kernel doing read outside kernel context\n");
 367         if (!file || !file->f_op || !file->f_op->read || !off)
 368                 RETURN(-ENOSYS);
 369
 370         return file->f_op->read(file, buf, len, off);
 371 }
 372 EXPORT_SYMBOL(lustre_fread);
 373
 374 /*
 375  * Write a file from within kernel context.  Prior to calling this
 376  * function we should already have done a push_ctxt().
 377  */
 378 int lustre_fwrite(struct file *file, const void *buf, int len, loff_t *off)
 379 {
 380         ENTRY;
 381         ASSERT_KERNEL_CTXT("kernel doing write outside kernel context\n");
 382         if (!file)
 383                 RETURN(-ENOENT);
 384         if (!file->f_op)
 385                 RETURN(-ENOSYS);
 386         if (!off)
 387                 RETURN(-EINVAL);
 388
 389         if (!file->f_op->write)
 390                 RETURN(-EROFS);
 391
 392         RETURN(file->f_op->write(file, buf, len, off));
 393 }
 394 EXPORT_SYMBOL(lustre_fwrite);
 395
 396 /*
 397  * Sync a file from within kernel context.  Prior to calling this
 398  * function we should already have done a push_ctxt().
 399  */
 400 int lustre_fsync(struct file *file)
 401 {
 402         ENTRY;
 403         ASSERT_KERNEL_CTXT("kernel doing sync outside kernel context\n");
 404         if (!file || !file->f_op || !file->f_op->fsync)
 405                 RETURN(-ENOSYS);
 406
 407         RETURN(file->f_op->fsync(file, file->f_dentry, 0));
 408 }
 409 EXPORT_SYMBOL(lustre_fsync);
 410
 411 struct l_file *l_dentry_open(struct lvfs_run_ctxt *ctxt, struct l_dentry *de,
 412                              int flags)
 413 {
 414         mntget(ctxt->pwdmnt);
 415         return dentry_open(de, ctxt->pwdmnt, flags);
 416 }
 417 EXPORT_SYMBOL(l_dentry_open);
 418
 419 #ifdef HAVE_VFS_READDIR_U64_INO
 420 static int l_filldir(void *__buf, const char *name, int namlen, loff_t offset,
 421                      u64 ino, unsigned int d_type)
 422 #else
 423 static int l_filldir(void *__buf, const char *name, int namlen, loff_t offset,
 424                      ino_t ino, unsigned int d_type)
 425 #endif
 426 {
 427         struct l_linux_dirent *dirent;
 428         struct l_readdir_callback *buf = (struct l_readdir_callback *)__buf;
 429
 430         dirent = buf->lrc_dirent;
 431         if (dirent)
 432                dirent->lld_off = offset;
 433
 434         OBD_ALLOC(dirent, sizeof(*dirent));
 435
 436         if (!dirent)
 437                 return -ENOMEM;
 438
 439         list_add_tail(&dirent->lld_list, buf->lrc_list);
 440
 441         buf->lrc_dirent = dirent;
 442         dirent->lld_ino = ino;
 443         LASSERT(sizeof(dirent->lld_name) >= namlen + 1);
 444         memcpy(dirent->lld_name, name, namlen);
 445
 446         return 0;
 447 }
 448
 449 long l_readdir(struct file *file, struct list_head *dentry_list)
 450 {
 451         struct l_linux_dirent *lastdirent;
 452         struct l_readdir_callback buf;
 453         int error;
 454
 455         buf.lrc_dirent = NULL;
 456         buf.lrc_list = dentry_list;
 457
 458         error = vfs_readdir(file, l_filldir, &buf);
 459         if (error < 0)
 460                 return error;
 461
 462         lastdirent = buf.lrc_dirent;
 463         if (lastdirent)
 464                 lastdirent->lld_off = file->f_pos;
 465
 466         return 0;
 467 }
 468 EXPORT_SYMBOL(l_readdir);
 469
 470 #ifdef LUSTRE_KERNEL_VERSION
 471 #ifndef HAVE_CLEAR_RDONLY_ON_PUT
 472 #error rdonly patchset must be updated [cfs bz11248]
 473 #endif
 474 void dev_set_rdonly(lvfs_sbdev_type dev);
 475 int dev_check_rdonly(lvfs_sbdev_type dev);
 476
 477 void __lvfs_set_rdonly(lvfs_sbdev_type dev, lvfs_sbdev_type jdev)
 478 {
 479         lvfs_sbdev_sync(dev);
 480         if (jdev && (jdev != dev)) {
 481                 CDEBUG(D_IOCTL | D_HA, "set journal dev %lx rdonly\n",
 482                        (long)jdev);
 483                 dev_set_rdonly(jdev);
 484         }
 485         CDEBUG(D_IOCTL | D_HA, "set dev %lx rdonly\n", (long)dev);
 486         dev_set_rdonly(dev);
 487 }
 488
 489 int lvfs_check_rdonly(lvfs_sbdev_type dev)
 490 {
 491         return dev_check_rdonly(dev);
 492 }
 493
 494 EXPORT_SYMBOL(__lvfs_set_rdonly);
 495 EXPORT_SYMBOL(lvfs_check_rdonly);
 496
 497 int lvfs_check_io_health(struct obd_device *obd, struct file *file)
 498 {
 499         char *write_page = NULL;
 500         loff_t offset = 0;
 501         int rc = 0;
 502         ENTRY;
 503
 504         OBD_ALLOC(write_page, CFS_PAGE_SIZE);
 505         if (!write_page)
 506                 RETURN(-ENOMEM);
 507
 508         rc = fsfilt_write_record(obd, file, write_page, CFS_PAGE_SIZE, &offset, 1);
 509
 510         OBD_FREE(write_page, CFS_PAGE_SIZE);
 511
 512         CDEBUG(D_INFO, "write 1 page synchronously for checking io rc %d\n",rc);
 513         RETURN(rc);
 514 }
 515 EXPORT_SYMBOL(lvfs_check_io_health);
 516 #endif /* LUSTRE_KERNEL_VERSION */
 517
 518 void obd_update_maxusage()
 519 {
 520         __u64 max1, max2;
 521
 522         max1 = obd_pages_sum();
 523         max2 = obd_memory_sum();
 524
 525         spin_lock(&obd_updatemax_lock);
 526         if (max1 > obd_max_pages)
 527                 obd_max_pages = max1;
 528         if (max2 > obd_max_alloc)
 529                 obd_max_alloc = max2;
 530         spin_unlock(&obd_updatemax_lock);
 531
 532 }
 533
 534 __u64 obd_memory_max(void)
 535 {
 536         __u64 ret;
 537
 538         spin_lock(&obd_updatemax_lock);
 539         ret = obd_max_alloc;
 540         spin_unlock(&obd_updatemax_lock);
 541
 542         return ret;
 543 }
 544
 545 __u64 obd_pages_max(void)
 546 {
 547         __u64 ret;
 548
 549         spin_lock(&obd_updatemax_lock);
 550         ret = obd_max_pages;
 551         spin_unlock(&obd_updatemax_lock);
 552
 553         return ret;
 554 }
 555
 556 EXPORT_SYMBOL(obd_update_maxusage);
 557 EXPORT_SYMBOL(obd_pages_max);
 558 EXPORT_SYMBOL(obd_memory_max);
 559 EXPORT_SYMBOL(obd_memory);
 560
 561 #ifdef LPROCFS
 562 __s64 lprocfs_read_helper(struct lprocfs_counter *lc,
 563                           enum lprocfs_fields_flags field)
 564 {
 565         __s64 ret = 0;
 566         int centry;
 567
 568         if (!lc)
 569                 RETURN(0);
 570         do {
 571                 centry = atomic_read(&lc->lc_cntl.la_entry);
 572
 573                 switch (field) {
 574                         case LPROCFS_FIELDS_FLAGS_CONFIG:
 575                                 ret = lc->lc_config;
 576                                 break;
 577                         case LPROCFS_FIELDS_FLAGS_SUM:
 578                                 ret = lc->lc_sum;
 579                                 break;
 580                         case LPROCFS_FIELDS_FLAGS_MIN:
 581                                 ret = lc->lc_min;
 582                                 break;
 583                         case LPROCFS_FIELDS_FLAGS_MAX:
 584                                 ret = lc->lc_max;
 585                                 break;
 586                         case LPROCFS_FIELDS_FLAGS_AVG:
 587                                 ret = (lc->lc_max - lc->lc_min)/2;
 588                                 break;
 589                         case LPROCFS_FIELDS_FLAGS_SUMSQUARE:
 590                                 ret = lc->lc_sumsquare;
 591                                 break;
 592                         case LPROCFS_FIELDS_FLAGS_COUNT:
 593                                 ret = lc->lc_count;
 594                                 break;
 595                         default:
 596                                 break;
 597                 };
 598         } while (centry != atomic_read(&lc->lc_cntl.la_entry) &&
 599                  centry != atomic_read(&lc->lc_cntl.la_exit));
 600
 601         RETURN(ret);
 602 }
 603 EXPORT_SYMBOL(lprocfs_read_helper);
 604 #endif /* LPROCFS */
 605
 606 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
 607 MODULE_DESCRIPTION("Lustre VFS Filesystem Helper v0.1");
 608 MODULE_LICENSE("GPL");