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
  62 __u64 obd_max_pages = 0;
  63 __u64 obd_max_alloc = 0;
  64 struct lprocfs_stats *obd_memory = NULL;
  65 EXPORT_SYMBOL(obd_memory);
  66 DEFINE_SPINLOCK(obd_updatemax_lock);
  67 /* refine later and change to seqlock or simlar from libcfs */
  68
  69 /* Debugging check only needed during development */
  70 #ifdef OBD_CTXT_DEBUG
  71 # define ASSERT_CTXT_MAGIC(magic) LASSERT((magic) == OBD_RUN_CTXT_MAGIC)
  72 # define ASSERT_NOT_KERNEL_CTXT(msg) LASSERTF(!segment_eq(get_fs(), get_ds()),\
  73                                               msg)
  74 # define ASSERT_KERNEL_CTXT(msg) LASSERTF(segment_eq(get_fs(), get_ds()), msg)
  75 #else
  76 # define ASSERT_CTXT_MAGIC(magic) do {} while(0)
  77 # define ASSERT_NOT_KERNEL_CTXT(msg) do {} while(0)
  78 # define ASSERT_KERNEL_CTXT(msg) do {} while(0)
  79 #endif
  80
  81 static void push_group_info(struct lvfs_run_ctxt *save,
  82                             struct group_info *ginfo)
  83 {
  84         if (!ginfo) {
  85                 save->ngroups = current_ngroups;
  86                 current_ngroups = 0;
  87         } else {
  88                 struct cred *cred;
  89                 task_lock(current);
  90                 save->group_info = current_cred()->group_info;
  91                 if ((cred = prepare_creds())) {
  92                         cred->group_info = ginfo;
  93                         commit_creds(cred);
  94                 }
  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                 struct cred *cred;
 106                 task_lock(current);
 107                 if ((cred = prepare_creds())) {
 108                         cred->group_info = save->group_info;
 109                         commit_creds(cred);
 110                 }
 111                 task_unlock(current);
 112         }
 113 }
 114
 115 /* push / pop to root of obd store */
 116 void push_ctxt(struct lvfs_run_ctxt *save, struct lvfs_run_ctxt *new_ctx,
 117                struct lvfs_ucred *uc)
 118 {
 119         /* if there is underlaying dt_device then push_ctxt is not needed */
 120         if (new_ctx->dt != NULL)
 121                 return;
 122
 123         //ASSERT_NOT_KERNEL_CTXT("already in kernel context!\n");
 124         ASSERT_CTXT_MAGIC(new_ctx->magic);
 125         OBD_SET_CTXT_MAGIC(save);
 126
 127         save->fs = get_fs();
 128         LASSERT(d_refcount(cfs_fs_pwd(current->fs)));
 129         LASSERT(d_refcount(new_ctx->pwd));
 130         save->pwd = dget(cfs_fs_pwd(current->fs));
 131         save->pwdmnt = mntget(cfs_fs_mnt(current->fs));
 132         save->luc.luc_umask = cfs_curproc_umask();
 133         save->ngroups = current_cred()->group_info->ngroups;
 134
 135         LASSERT(save->pwd);
 136         LASSERT(save->pwdmnt);
 137         LASSERT(new_ctx->pwd);
 138         LASSERT(new_ctx->pwdmnt);
 139
 140         if (uc) {
 141                 struct cred *cred;
 142                 save->luc.luc_uid = current_uid();
 143                 save->luc.luc_gid = current_gid();
 144                 save->luc.luc_fsuid = current_fsuid();
 145                 save->luc.luc_fsgid = current_fsgid();
 146                 save->luc.luc_cap = current_cap();
 147
 148                 if ((cred = prepare_creds())) {
 149                         cred->uid = uc->luc_uid;
 150                         cred->gid = uc->luc_gid;
 151                         cred->fsuid = uc->luc_fsuid;
 152                         cred->fsgid = uc->luc_fsgid;
 153                         cred->cap_effective = uc->luc_cap;
 154                         commit_creds(cred);
 155                 }
 156
 157                 push_group_info(save,
 158                                 uc->luc_ginfo ?:
 159                                 uc->luc_identity ? uc->luc_identity->mi_ginfo :
 160                                                    NULL);
 161         }
 162         current->fs->umask = 0; /* umask already applied on client */
 163         set_fs(new_ctx->fs);
 164         ll_set_fs_pwd(current->fs, new_ctx->pwdmnt, new_ctx->pwd);
 165 }
 166 EXPORT_SYMBOL(push_ctxt);
 167
 168 void pop_ctxt(struct lvfs_run_ctxt *saved, struct lvfs_run_ctxt *new_ctx,
 169               struct lvfs_ucred *uc)
 170 {
 171         /* if there is underlaying dt_device then pop_ctxt is not needed */
 172         if (new_ctx->dt != NULL)
 173                 return;
 174
 175         ASSERT_CTXT_MAGIC(saved->magic);
 176         ASSERT_KERNEL_CTXT("popping non-kernel context!\n");
 177
 178         LASSERTF(cfs_fs_pwd(current->fs) == new_ctx->pwd, "%p != %p\n",
 179                  cfs_fs_pwd(current->fs), new_ctx->pwd);
 180         LASSERTF(cfs_fs_mnt(current->fs) == new_ctx->pwdmnt, "%p != %p\n",
 181                  cfs_fs_mnt(current->fs), new_ctx->pwdmnt);
 182
 183         set_fs(saved->fs);
 184         ll_set_fs_pwd(current->fs, saved->pwdmnt, saved->pwd);
 185
 186         dput(saved->pwd);
 187         mntput(saved->pwdmnt);
 188         current->fs->umask = saved->luc.luc_umask;
 189         if (uc) {
 190                 struct cred *cred;
 191                 if ((cred = prepare_creds())) {
 192                         cred->uid = saved->luc.luc_uid;
 193                         cred->gid = saved->luc.luc_gid;
 194                         cred->fsuid = saved->luc.luc_fsuid;
 195                         cred->fsgid = saved->luc.luc_fsgid;
 196                         cred->cap_effective = saved->luc.luc_cap;
 197                         commit_creds(cred);
 198                 }
 199
 200                 pop_group_info(saved,
 201                                uc->luc_ginfo ?:
 202                                uc->luc_identity ? uc->luc_identity->mi_ginfo :
 203                                                   NULL);
 204         }
 205 }
 206 EXPORT_SYMBOL(pop_ctxt);
 207
 208 /* utility to make a file */
 209 struct dentry *simple_mknod(struct dentry *dir, char *name, int mode, int fix)
 210 {
 211         struct dentry *dchild;
 212         int err = 0;
 213         ENTRY;
 214
 215         // ASSERT_KERNEL_CTXT("kernel doing mknod outside kernel context\n");
 216         CDEBUG(D_INODE, "creating file %.*s\n", (int)strlen(name), name);
 217
 218         dchild = ll_lookup_one_len(name, dir, strlen(name));
 219         if (IS_ERR(dchild))
 220                 GOTO(out_up, dchild);
 221
 222         if (dchild->d_inode) {
 223                 int old_mode = dchild->d_inode->i_mode;
 224                 if (!S_ISREG(old_mode))
 225                         GOTO(out_err, err = -EEXIST);
 226
 227                 /* Fixup file permissions if necessary */
 228                 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
 229                         CWARN("fixing permissions on %s from %o to %o\n",
 230                               name, old_mode, mode);
 231                         dchild->d_inode->i_mode = (mode & S_IALLUGO) |
 232                                                   (old_mode & ~S_IALLUGO);
 233                         mark_inode_dirty(dchild->d_inode);
 234                 }
 235                 GOTO(out_up, dchild);
 236         }
 237
 238         err = vfs_create(dir->d_inode, dchild, (mode & ~S_IFMT) | S_IFREG,
 239                             NULL);
 240         if (err)
 241                 GOTO(out_err, err);
 242
 243         RETURN(dchild);
 244
 245 out_err:
 246         dput(dchild);
 247         dchild = ERR_PTR(err);
 248 out_up:
 249         return dchild;
 250 }
 251 EXPORT_SYMBOL(simple_mknod);
 252
 253 /* utility to make a directory */
 254 struct dentry *simple_mkdir(struct dentry *dir, struct vfsmount *mnt,
 255                             const char *name, int mode, int fix)
 256 {
 257         struct dentry *dchild;
 258         int err = 0;
 259         ENTRY;
 260
 261         // ASSERT_KERNEL_CTXT("kernel doing mkdir outside kernel context\n");
 262         CDEBUG(D_INODE, "creating directory %.*s\n", (int)strlen(name), name);
 263         dchild = ll_lookup_one_len(name, dir, strlen(name));
 264         if (IS_ERR(dchild))
 265                 GOTO(out_up, dchild);
 266
 267         if (dchild->d_inode) {
 268                 int old_mode = dchild->d_inode->i_mode;
 269                 if (!S_ISDIR(old_mode)) {
 270                         CERROR("found %s (%lu/%u) is mode %o\n", name,
 271                                dchild->d_inode->i_ino,
 272                                dchild->d_inode->i_generation, old_mode);
 273                         GOTO(out_err, err = -ENOTDIR);
 274                 }
 275
 276                 /* Fixup directory permissions if necessary */
 277                 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
 278                         CDEBUG(D_CONFIG,
 279                                "fixing permissions on %s from %o to %o\n",
 280                                name, old_mode, mode);
 281                         dchild->d_inode->i_mode = (mode & S_IALLUGO) |
 282                                                   (old_mode & ~S_IALLUGO);
 283                         mark_inode_dirty(dchild->d_inode);
 284                 }
 285                 GOTO(out_up, dchild);
 286         }
 287
 288         err = ll_vfs_mkdir(dir->d_inode, dchild, mnt, mode);
 289         if (err)
 290                 GOTO(out_err, err);
 291
 292         RETURN(dchild);
 293
 294 out_err:
 295         dput(dchild);
 296         dchild = ERR_PTR(err);
 297 out_up:
 298         return dchild;
 299 }
 300 EXPORT_SYMBOL(simple_mkdir);
 301
 302 /* utility to rename a file */
 303 int lustre_rename(struct dentry *dir, struct vfsmount *mnt,
 304                   char *oldname, char *newname)
 305 {
 306         struct dentry *dchild_old, *dchild_new;
 307         int err = 0;
 308         ENTRY;
 309
 310         ASSERT_KERNEL_CTXT("kernel doing rename outside kernel context\n");
 311         CDEBUG(D_INODE, "renaming file %.*s to %.*s\n",
 312                (int)strlen(oldname), oldname, (int)strlen(newname), newname);
 313
 314         dchild_old = ll_lookup_one_len(oldname, dir, strlen(oldname));
 315         if (IS_ERR(dchild_old))
 316                 RETURN(PTR_ERR(dchild_old));
 317
 318         if (!dchild_old->d_inode)
 319                 GOTO(put_old, err = -ENOENT);
 320
 321         dchild_new = ll_lookup_one_len(newname, dir, strlen(newname));
 322         if (IS_ERR(dchild_new))
 323                 GOTO(put_old, err = PTR_ERR(dchild_new));
 324
 325         err = ll_vfs_rename(dir->d_inode, dchild_old, mnt,
 326                             dir->d_inode, dchild_new, mnt);
 327
 328         dput(dchild_new);
 329 put_old:
 330         dput(dchild_old);
 331         RETURN(err);
 332 }
 333 EXPORT_SYMBOL(lustre_rename);
 334
 335 /*
 336  * Read a file from within kernel context.  Prior to calling this
 337  * function we should already have done a push_ctxt().
 338  */
 339 int lustre_fread(struct file *file, void *buf, int len, loff_t *off)
 340 {
 341         ASSERT_KERNEL_CTXT("kernel doing read outside kernel context\n");
 342         if (!file || !file->f_op || !file->f_op->read || !off)
 343                 RETURN(-ENOSYS);
 344
 345         return file->f_op->read(file, buf, len, off);
 346 }
 347 EXPORT_SYMBOL(lustre_fread);
 348
 349 /*
 350  * Write a file from within kernel context.  Prior to calling this
 351  * function we should already have done a push_ctxt().
 352  */
 353 int lustre_fwrite(struct file *file, const void *buf, int len, loff_t *off)
 354 {
 355         ENTRY;
 356         ASSERT_KERNEL_CTXT("kernel doing write outside kernel context\n");
 357         if (!file)
 358                 RETURN(-ENOENT);
 359         if (!file->f_op)
 360                 RETURN(-ENOSYS);
 361         if (!off)
 362                 RETURN(-EINVAL);
 363
 364         if (!file->f_op->write)
 365                 RETURN(-EROFS);
 366
 367         RETURN(file->f_op->write(file, buf, len, off));
 368 }
 369 EXPORT_SYMBOL(lustre_fwrite);
 370
 371 /*
 372  * Sync a file from within kernel context.  Prior to calling this
 373  * function we should already have done a push_ctxt().
 374  */
 375 int lustre_fsync(struct file *file)
 376 {
 377         ENTRY;
 378         ASSERT_KERNEL_CTXT("kernel doing sync outside kernel context\n");
 379         if (!file || !file->f_op || !file->f_op->fsync)
 380                 RETURN(-ENOSYS);
 381
 382         RETURN(cfs_do_fsync(file, 0));
 383 }
 384 EXPORT_SYMBOL(lustre_fsync);
 385
 386 /* Note: dput(dchild) will be called if there is an error */
 387 struct l_file *l_dentry_open(struct lvfs_run_ctxt *ctxt, struct l_dentry *de,
 388                              int flags)
 389 {
 390         mntget(ctxt->pwdmnt);
 391         return ll_dentry_open(de, ctxt->pwdmnt, flags, current_cred());
 392 }
 393 EXPORT_SYMBOL(l_dentry_open);
 394
 395 static int l_filldir(void *__buf, const char *name, int namlen, loff_t offset,
 396                      u64 ino, unsigned int d_type)
 397 {
 398         struct l_linux_dirent *dirent;
 399         struct l_readdir_callback *buf = (struct l_readdir_callback *)__buf;
 400
 401         dirent = buf->lrc_dirent;
 402         if (dirent)
 403                dirent->lld_off = offset;
 404
 405         OBD_ALLOC(dirent, sizeof(*dirent));
 406
 407         if (!dirent)
 408                 return -ENOMEM;
 409
 410         cfs_list_add_tail(&dirent->lld_list, buf->lrc_list);
 411
 412         buf->lrc_dirent = dirent;
 413         dirent->lld_ino = ino;
 414         LASSERT(sizeof(dirent->lld_name) >= namlen + 1);
 415         memcpy(dirent->lld_name, name, namlen);
 416
 417         return 0;
 418 }
 419
 420 long l_readdir(struct file *file, cfs_list_t *dentry_list)
 421 {
 422         struct l_linux_dirent *lastdirent;
 423         struct l_readdir_callback buf;
 424         int error;
 425
 426         buf.lrc_dirent = NULL;
 427         buf.lrc_list = dentry_list;
 428
 429         error = vfs_readdir(file, l_filldir, &buf);
 430         if (error < 0)
 431                 return error;
 432
 433         lastdirent = buf.lrc_dirent;
 434         if (lastdirent)
 435                 lastdirent->lld_off = file->f_pos;
 436
 437         return 0;
 438 }
 439 EXPORT_SYMBOL(l_readdir);
 440
 441 int l_notify_change(struct vfsmount *mnt, struct dentry *dchild,
 442                     struct iattr *newattrs)
 443 {
 444         int rc;
 445
 446         mutex_lock(&dchild->d_inode->i_mutex);
 447 #ifdef HAVE_SECURITY_PLUG
 448         rc = notify_change(dchild, mnt, newattrs);
 449 #else
 450         rc = notify_change(dchild, newattrs);
 451 #endif
 452         mutex_unlock(&dchild->d_inode->i_mutex);
 453         return rc;
 454 }
 455 EXPORT_SYMBOL(l_notify_change);
 456
 457 /* utility to truncate a file */
 458 int simple_truncate(struct dentry *dir, struct vfsmount *mnt,
 459                  char *name, loff_t length)
 460 {
 461         struct dentry *dchild;
 462         struct iattr newattrs;
 463         int err = 0;
 464         ENTRY;
 465
 466         CDEBUG(D_INODE, "truncating file %.*s to %lld\n", (int)strlen(name),
 467                name, (long long)length);
 468         dchild = ll_lookup_one_len(name, dir, strlen(name));
 469         if (IS_ERR(dchild))
 470                 GOTO(out, err = PTR_ERR(dchild));
 471
 472         if (dchild->d_inode) {
 473                 int old_mode = dchild->d_inode->i_mode;
 474                 if (S_ISDIR(old_mode)) {
 475                         CERROR("found %s (%lu/%u) is mode %o\n", name,
 476                                dchild->d_inode->i_ino,
 477                                dchild->d_inode->i_generation, old_mode);
 478                         GOTO(out_dput, err = -EISDIR);
 479                 }
 480
 481                 newattrs.ia_size = length;
 482                 newattrs.ia_valid = ATTR_SIZE;
 483                 err = l_notify_change(mnt, dchild, &newattrs);
 484         }
 485         EXIT;
 486 out_dput:
 487         dput(dchild);
 488 out:
 489         return err;
 490 }
 491 EXPORT_SYMBOL(simple_truncate);
 492
 493 int __lvfs_set_rdonly(lvfs_sbdev_type dev, lvfs_sbdev_type jdev)
 494 {
 495 #ifdef HAVE_DEV_SET_RDONLY
 496         if (jdev && (jdev != dev)) {
 497                 CDEBUG(D_IOCTL | D_HA, "set journal dev %lx rdonly\n",
 498                        (long)jdev);
 499                 dev_set_rdonly(jdev);
 500         }
 501         CDEBUG(D_IOCTL | D_HA, "set dev %lx rdonly\n", (long)dev);
 502         dev_set_rdonly(dev);
 503
 504         return 0;
 505 #else
 506         CERROR("DEV %lx CANNOT BE SET READONLY\n", (long)dev);
 507
 508         return -EOPNOTSUPP;
 509 #endif
 510 }
 511 EXPORT_SYMBOL(__lvfs_set_rdonly);
 512
 513 int lvfs_check_rdonly(lvfs_sbdev_type dev)
 514 {
 515 #ifdef HAVE_DEV_SET_RDONLY
 516         return dev_check_rdonly(dev);
 517 #else
 518         return 0;
 519 #endif
 520 }
 521 EXPORT_SYMBOL(lvfs_check_rdonly);
 522
 523 int lvfs_check_io_health(struct obd_device *obd, struct file *file)
 524 {
 525         char *write_page = NULL;
 526         loff_t offset = 0;
 527         int rc = 0;
 528         ENTRY;
 529
 530         OBD_ALLOC(write_page, CFS_PAGE_SIZE);
 531         if (!write_page)
 532                 RETURN(-ENOMEM);
 533
 534         rc = fsfilt_write_record(obd, file, write_page, CFS_PAGE_SIZE, &offset, 1);
 535
 536         OBD_FREE(write_page, CFS_PAGE_SIZE);
 537
 538         CDEBUG(D_INFO, "write 1 page synchronously for checking io rc %d\n",rc);
 539         RETURN(rc);
 540 }
 541 EXPORT_SYMBOL(lvfs_check_io_health);
 542
 543 void obd_update_maxusage()
 544 {
 545         __u64 max1, max2;
 546
 547         max1 = obd_pages_sum();
 548         max2 = obd_memory_sum();
 549
 550         spin_lock(&obd_updatemax_lock);
 551         if (max1 > obd_max_pages)
 552                 obd_max_pages = max1;
 553         if (max2 > obd_max_alloc)
 554                 obd_max_alloc = max2;
 555         spin_unlock(&obd_updatemax_lock);
 556
 557 }
 558 EXPORT_SYMBOL(obd_update_maxusage);
 559
 560 __u64 obd_memory_max(void)
 561 {
 562         __u64 ret;
 563
 564         spin_lock(&obd_updatemax_lock);
 565         ret = obd_max_alloc;
 566         spin_unlock(&obd_updatemax_lock);
 567
 568         return ret;
 569 }
 570 EXPORT_SYMBOL(obd_memory_max);
 571
 572 __u64 obd_pages_max(void)
 573 {
 574         __u64 ret;
 575
 576         spin_lock(&obd_updatemax_lock);
 577         ret = obd_max_pages;
 578         spin_unlock(&obd_updatemax_lock);
 579
 580         return ret;
 581 }
 582 EXPORT_SYMBOL(obd_pages_max);
 583
 584 #ifdef LPROCFS
 585 __s64 lprocfs_read_helper(struct lprocfs_counter *lc,
 586                           enum lprocfs_fields_flags field)
 587 {
 588         __s64 ret = 0;
 589         int centry;
 590
 591         if (!lc)
 592                 RETURN(0);
 593         do {
 594                 centry = cfs_atomic_read(&lc->lc_cntl.la_entry);
 595
 596                 switch (field) {
 597                         case LPROCFS_FIELDS_FLAGS_CONFIG:
 598                                 ret = lc->lc_config;
 599                                 break;
 600                         case LPROCFS_FIELDS_FLAGS_SUM:
 601                                 ret = lc->lc_sum + lc->lc_sum_irq;
 602                                 break;
 603                         case LPROCFS_FIELDS_FLAGS_MIN:
 604                                 ret = lc->lc_min;
 605                                 break;
 606                         case LPROCFS_FIELDS_FLAGS_MAX:
 607                                 ret = lc->lc_max;
 608                                 break;
 609                         case LPROCFS_FIELDS_FLAGS_AVG:
 610                                 ret = (lc->lc_max - lc->lc_min)/2;
 611                                 break;
 612                         case LPROCFS_FIELDS_FLAGS_SUMSQUARE:
 613                                 ret = lc->lc_sumsquare;
 614                                 break;
 615                         case LPROCFS_FIELDS_FLAGS_COUNT:
 616                                 ret = lc->lc_count;
 617                                 break;
 618                         default:
 619                                 break;
 620                 };
 621         } while (centry != cfs_atomic_read(&lc->lc_cntl.la_entry) &&
 622                  centry != cfs_atomic_read(&lc->lc_cntl.la_exit));
 623
 624         RETURN(ret);
 625 }
 626 EXPORT_SYMBOL(lprocfs_read_helper);
 627 #endif /* LPROCFS */
 628
 629 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
 630 MODULE_DESCRIPTION("Lustre VFS Filesystem Helper v0.1");
 631 MODULE_LICENSE("GPL");