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